add lietorch src code and eigen src code, update readme

eigen-master/Eigen/src/Core/MatrixBase.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2006-2009 Benoit Jacob <jacob.benoit.1@gmail.com>
+// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_MATRIXBASE_H
+#define EIGEN_MATRIXBASE_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+/** \class MatrixBase
+  * \ingroup Core_Module
+  *
+  * \brief Base class for all dense matrices, vectors, and expressions
+  *
+  * This class is the base that is inherited by all matrix, vector, and related expression
+  * types. Most of the Eigen API is contained in this class, and its base classes. Other important
+  * classes for the Eigen API are Matrix, and VectorwiseOp.
+  *
+  * Note that some methods are defined in other modules such as the \ref LU_Module LU module
+  * for all functions related to matrix inversions.
+  *
+  * \tparam Derived is the derived type, e.g. a matrix type, or an expression, etc.
+  *
+  * When writing a function taking Eigen objects as argument, if you want your function
+  * to take as argument any matrix, vector, or expression, just let it take a
+  * MatrixBase argument. As an example, here is a function printFirstRow which, given
+  * a matrix, vector, or expression \a x, prints the first row of \a x.
+  *
+  * \code
+    template<typename Derived>
+    void printFirstRow(const Eigen::MatrixBase<Derived>& x)
+    {
+      cout << x.row(0) << endl;
+    }
+  * \endcode
+  *
+  * This class can be extended with the help of the plugin mechanism described on the page
+  * \ref TopicCustomizing_Plugins by defining the preprocessor symbol \c EIGEN_MATRIXBASE_PLUGIN.
+  *
+  * \sa \blank \ref TopicClassHierarchy
+  */
+template <typename Derived>
+class MatrixBase : public DenseBase<Derived> {
+ public:
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  typedef MatrixBase StorageBaseType;
+  typedef typename internal::traits<Derived>::StorageKind StorageKind;
+  typedef typename internal::traits<Derived>::StorageIndex StorageIndex;
+  typedef typename internal::traits<Derived>::Scalar Scalar;
+  typedef typename internal::packet_traits<Scalar>::type PacketScalar;
+  typedef typename NumTraits<Scalar>::Real RealScalar;
+
+  typedef DenseBase<Derived> Base;
+  using Base::ColsAtCompileTime;
+  using Base::Flags;
+  using Base::IsVectorAtCompileTime;
+  using Base::MaxColsAtCompileTime;
+  using Base::MaxRowsAtCompileTime;
+  using Base::MaxSizeAtCompileTime;
+  using Base::RowsAtCompileTime;
+  using Base::SizeAtCompileTime;
+
+  using Base::coeff;
+  using Base::coeffRef;
+  using Base::cols;
+  using Base::const_cast_derived;
+  using Base::derived;
+  using Base::eval;
+  using Base::lazyAssign;
+  using Base::rows;
+  using Base::size;
+  using Base::operator-;
+  using Base::operator+=;
+  using Base::operator-=;
+  using Base::operator*=;
+  using Base::operator/=;
+
+  typedef typename Base::CoeffReturnType CoeffReturnType;
+  typedef typename Base::ConstTransposeReturnType ConstTransposeReturnType;
+  typedef typename Base::RowXpr RowXpr;
+  typedef typename Base::ColXpr ColXpr;
+#endif  // not EIGEN_PARSED_BY_DOXYGEN
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  /** type of the equivalent square matrix */
+  typedef Matrix<Scalar, internal::max_size_prefer_dynamic(RowsAtCompileTime, ColsAtCompileTime),
+                 internal::max_size_prefer_dynamic(RowsAtCompileTime, ColsAtCompileTime)>
+      SquareMatrixType;
+#endif  // not EIGEN_PARSED_BY_DOXYGEN
+
+  /** \returns the size of the main diagonal, which is min(rows(),cols()).
+   * \sa rows(), cols(), SizeAtCompileTime. */
+  EIGEN_DEVICE_FUNC inline Index diagonalSize() const { return (numext::mini)(rows(), cols()); }
+
+  typedef typename Base::PlainObject PlainObject;
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  /** \internal Represents a matrix with all coefficients equal to one another*/
+  typedef CwiseNullaryOp<internal::scalar_constant_op<Scalar>, PlainObject> ConstantReturnType;
+  /** \internal the return type of MatrixBase::adjoint() */
+  typedef std::conditional_t<NumTraits<Scalar>::IsComplex,
+                             CwiseUnaryOp<internal::scalar_conjugate_op<Scalar>, ConstTransposeReturnType>,
+                             ConstTransposeReturnType>
+      AdjointReturnType;
+  /** \internal Return type of eigenvalues() */
+  typedef Matrix<internal::make_complex_t<Scalar>, internal::traits<Derived>::ColsAtCompileTime, 1, ColMajor>
+      EigenvaluesReturnType;
+  /** \internal the return type of identity */
+  typedef CwiseNullaryOp<internal::scalar_identity_op<Scalar>, PlainObject> IdentityReturnType;
+  /** \internal the return type of unit vectors */
+  typedef Block<const CwiseNullaryOp<internal::scalar_identity_op<Scalar>, SquareMatrixType>,
+                internal::traits<Derived>::RowsAtCompileTime, internal::traits<Derived>::ColsAtCompileTime>
+      BasisReturnType;
+#endif  // not EIGEN_PARSED_BY_DOXYGEN
+
+#define EIGEN_CURRENT_STORAGE_BASE_CLASS Eigen::MatrixBase
+#define EIGEN_DOC_UNARY_ADDONS(X, Y)
+#include "../plugins/CommonCwiseBinaryOps.inc"
+#include "../plugins/MatrixCwiseUnaryOps.inc"
+#include "../plugins/MatrixCwiseBinaryOps.inc"
+#ifdef EIGEN_MATRIXBASE_PLUGIN
+#include EIGEN_MATRIXBASE_PLUGIN
+#endif
+#undef EIGEN_CURRENT_STORAGE_BASE_CLASS
+#undef EIGEN_DOC_UNARY_ADDONS
+
+  /** Special case of the template operator=, in order to prevent the compiler
+   * from generating a default operator= (issue hit with g++ 4.1)
+   */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& operator=(const MatrixBase& other);
+
+  // We cannot inherit here via Base::operator= since it is causing
+  // trouble with MSVC.
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& operator=(const DenseBase<OtherDerived>& other);
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC Derived& operator=(const EigenBase<OtherDerived>& other);
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC Derived& operator=(const ReturnByValue<OtherDerived>& other);
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& operator+=(const MatrixBase<OtherDerived>& other);
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& operator-=(const MatrixBase<OtherDerived>& other);
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC const Product<Derived, OtherDerived> operator*(const MatrixBase<OtherDerived>& other) const;
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC const Product<Derived, OtherDerived, LazyProduct> lazyProduct(
+      const MatrixBase<OtherDerived>& other) const;
+
+  template <typename OtherDerived>
+  Derived& operator*=(const EigenBase<OtherDerived>& other);
+
+  template <typename OtherDerived>
+  void applyOnTheLeft(const EigenBase<OtherDerived>& other);
+
+  template <typename OtherDerived>
+  void applyOnTheRight(const EigenBase<OtherDerived>& other);
+
+  template <typename DiagonalDerived>
+  EIGEN_DEVICE_FUNC const Product<Derived, DiagonalDerived, LazyProduct> operator*(
+      const DiagonalBase<DiagonalDerived>& diagonal) const;
+
+  template <typename SkewDerived>
+  EIGEN_DEVICE_FUNC const Product<Derived, SkewDerived, LazyProduct> operator*(
+      const SkewSymmetricBase<SkewDerived>& skew) const;
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC typename ScalarBinaryOpTraits<typename internal::traits<Derived>::Scalar,
+                                                  typename internal::traits<OtherDerived>::Scalar>::ReturnType
+  dot(const MatrixBase<OtherDerived>& other) const;
+
+  EIGEN_DEVICE_FUNC RealScalar squaredNorm() const;
+  EIGEN_DEVICE_FUNC RealScalar norm() const;
+  RealScalar stableNorm() const;
+  RealScalar blueNorm() const;
+  RealScalar hypotNorm() const;
+  EIGEN_DEVICE_FUNC const PlainObject normalized() const;
+  EIGEN_DEVICE_FUNC const PlainObject stableNormalized() const;
+  EIGEN_DEVICE_FUNC void normalize();
+  EIGEN_DEVICE_FUNC void stableNormalize();
+
+  EIGEN_DEVICE_FUNC const AdjointReturnType adjoint() const;
+  EIGEN_DEVICE_FUNC void adjointInPlace();
+
+  typedef Diagonal<Derived> DiagonalReturnType;
+  EIGEN_DEVICE_FUNC DiagonalReturnType diagonal();
+
+  typedef Diagonal<const Derived> ConstDiagonalReturnType;
+  EIGEN_DEVICE_FUNC const ConstDiagonalReturnType diagonal() const;
+
+  template <int Index>
+  EIGEN_DEVICE_FUNC Diagonal<Derived, Index> diagonal();
+
+  template <int Index>
+  EIGEN_DEVICE_FUNC const Diagonal<const Derived, Index> diagonal() const;
+
+  EIGEN_DEVICE_FUNC Diagonal<Derived, DynamicIndex> diagonal(Index index);
+  EIGEN_DEVICE_FUNC const Diagonal<const Derived, DynamicIndex> diagonal(Index index) const;
+
+  template <unsigned int Mode>
+  struct TriangularViewReturnType {
+    typedef TriangularView<Derived, Mode> Type;
+  };
+  template <unsigned int Mode>
+  struct ConstTriangularViewReturnType {
+    typedef const TriangularView<const Derived, Mode> Type;
+  };
+
+  template <unsigned int Mode>
+  EIGEN_DEVICE_FUNC typename TriangularViewReturnType<Mode>::Type triangularView();
+  template <unsigned int Mode>
+  EIGEN_DEVICE_FUNC typename ConstTriangularViewReturnType<Mode>::Type triangularView() const;
+
+  template <unsigned int UpLo>
+  struct SelfAdjointViewReturnType {
+    typedef SelfAdjointView<Derived, UpLo> Type;
+  };
+  template <unsigned int UpLo>
+  struct ConstSelfAdjointViewReturnType {
+    typedef const SelfAdjointView<const Derived, UpLo> Type;
+  };
+
+  template <unsigned int UpLo>
+  EIGEN_DEVICE_FUNC typename SelfAdjointViewReturnType<UpLo>::Type selfadjointView();
+  template <unsigned int UpLo>
+  EIGEN_DEVICE_FUNC typename ConstSelfAdjointViewReturnType<UpLo>::Type selfadjointView() const;
+
+  const SparseView<Derived> sparseView(
+      const Scalar& m_reference = Scalar(0),
+      const typename NumTraits<Scalar>::Real& m_epsilon = NumTraits<Scalar>::dummy_precision()) const;
+  EIGEN_DEVICE_FUNC static const IdentityReturnType Identity();
+  EIGEN_DEVICE_FUNC static const IdentityReturnType Identity(Index rows, Index cols);
+  EIGEN_DEVICE_FUNC static const BasisReturnType Unit(Index size, Index i);
+  EIGEN_DEVICE_FUNC static const BasisReturnType Unit(Index i);
+  EIGEN_DEVICE_FUNC static const BasisReturnType UnitX();
+  EIGEN_DEVICE_FUNC static const BasisReturnType UnitY();
+  EIGEN_DEVICE_FUNC static const BasisReturnType UnitZ();
+  EIGEN_DEVICE_FUNC static const BasisReturnType UnitW();
+
+  EIGEN_DEVICE_FUNC const DiagonalWrapper<const Derived> asDiagonal() const;
+  const PermutationWrapper<const Derived> asPermutation() const;
+  EIGEN_DEVICE_FUNC const SkewSymmetricWrapper<const Derived> asSkewSymmetric() const;
+
+  EIGEN_DEVICE_FUNC Derived& setIdentity();
+  EIGEN_DEVICE_FUNC Derived& setIdentity(Index rows, Index cols);
+  EIGEN_DEVICE_FUNC Derived& setUnit(Index i);
+  EIGEN_DEVICE_FUNC Derived& setUnit(Index newSize, Index i);
+
+  bool isIdentity(const RealScalar& prec = NumTraits<Scalar>::dummy_precision()) const;
+  bool isDiagonal(const RealScalar& prec = NumTraits<Scalar>::dummy_precision()) const;
+
+  bool isUpperTriangular(const RealScalar& prec = NumTraits<Scalar>::dummy_precision()) const;
+  bool isLowerTriangular(const RealScalar& prec = NumTraits<Scalar>::dummy_precision()) const;
+
+  bool isSkewSymmetric(const RealScalar& prec = NumTraits<Scalar>::dummy_precision()) const;
+
+  template <typename OtherDerived>
+  bool isOrthogonal(const MatrixBase<OtherDerived>& other,
+                    const RealScalar& prec = NumTraits<Scalar>::dummy_precision()) const;
+  bool isUnitary(const RealScalar& prec = NumTraits<Scalar>::dummy_precision()) const;
+
+  /** \returns true if each coefficients of \c *this and \a other are all exactly equal.
+   * \warning When using floating point scalar values you probably should rather use a
+   *          fuzzy comparison such as isApprox()
+   * \sa isApprox(), operator!= */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC inline bool operator==(const MatrixBase<OtherDerived>& other) const {
+    return (this->rows() == other.rows()) && (this->cols() == other.cols()) && cwiseEqual(other).all();
+  }
+
+  /** \returns true if at least one pair of coefficients of \c *this and \a other are not exactly equal to each other.
+   * \warning When using floating point scalar values you probably should rather use a
+   *          fuzzy comparison such as isApprox()
+   * \sa isApprox(), operator== */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC inline bool operator!=(const MatrixBase<OtherDerived>& other) const {
+    return !(*this == other);
+  }
+
+  NoAlias<Derived, Eigen::MatrixBase> EIGEN_DEVICE_FUNC noalias();
+
+  // TODO forceAlignedAccess is temporarily disabled
+  // Need to find a nicer workaround.
+  inline const Derived& forceAlignedAccess() const { return derived(); }
+  inline Derived& forceAlignedAccess() { return derived(); }
+  template <bool Enable>
+  inline const Derived& forceAlignedAccessIf() const {
+    return derived();
+  }
+  template <bool Enable>
+  inline Derived& forceAlignedAccessIf() {
+    return derived();
+  }
+
+  EIGEN_DEVICE_FUNC Scalar trace() const;
+
+  template <int p>
+  EIGEN_DEVICE_FUNC RealScalar lpNorm() const;
+
+  EIGEN_DEVICE_FUNC MatrixBase<Derived>& matrix() { return *this; }
+  EIGEN_DEVICE_FUNC const MatrixBase<Derived>& matrix() const { return *this; }
+
+  /** \returns an \link Eigen::ArrayBase Array \endlink expression of this matrix
+   * \sa ArrayBase::matrix() */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE ArrayWrapper<Derived> array() { return ArrayWrapper<Derived>(derived()); }
+  /** \returns a const \link Eigen::ArrayBase Array \endlink expression of this matrix
+   * \sa ArrayBase::matrix() */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const ArrayWrapper<const Derived> array() const {
+    return ArrayWrapper<const Derived>(derived());
+  }
+
+  /////////// LU module ///////////
+
+  template <typename PermutationIndex = DefaultPermutationIndex>
+  inline const FullPivLU<PlainObject, PermutationIndex> fullPivLu() const;
+  template <typename PermutationIndex = DefaultPermutationIndex>
+  inline const PartialPivLU<PlainObject, PermutationIndex> partialPivLu() const;
+
+  template <typename PermutationIndex = DefaultPermutationIndex>
+  inline const PartialPivLU<PlainObject, PermutationIndex> lu() const;
+
+  EIGEN_DEVICE_FUNC inline const Inverse<Derived> inverse() const;
+
+  template <typename ResultType>
+  inline void computeInverseAndDetWithCheck(
+      ResultType& inverse, typename ResultType::Scalar& determinant, bool& invertible,
+      const RealScalar& absDeterminantThreshold = NumTraits<Scalar>::dummy_precision()) const;
+
+  template <typename ResultType>
+  inline void computeInverseWithCheck(
+      ResultType& inverse, bool& invertible,
+      const RealScalar& absDeterminantThreshold = NumTraits<Scalar>::dummy_precision()) const;
+
+  EIGEN_DEVICE_FUNC Scalar determinant() const;
+
+  /////////// Cholesky module ///////////
+
+  inline const LLT<PlainObject> llt() const;
+  inline const LDLT<PlainObject> ldlt() const;
+
+  /////////// QR module ///////////
+
+  inline const HouseholderQR<PlainObject> householderQr() const;
+  template <typename PermutationIndex = DefaultPermutationIndex>
+  inline const ColPivHouseholderQR<PlainObject, PermutationIndex> colPivHouseholderQr() const;
+  template <typename PermutationIndex = DefaultPermutationIndex>
+  inline const FullPivHouseholderQR<PlainObject, PermutationIndex> fullPivHouseholderQr() const;
+  template <typename PermutationIndex = DefaultPermutationIndex>
+  inline const CompleteOrthogonalDecomposition<PlainObject, PermutationIndex> completeOrthogonalDecomposition() const;
+
+  /////////// Eigenvalues module ///////////
+
+  inline EigenvaluesReturnType eigenvalues() const;
+  inline RealScalar operatorNorm() const;
+
+  /////////// SVD module ///////////
+
+  template <int Options = 0>
+  inline JacobiSVD<PlainObject, Options> jacobiSvd() const;
+  template <int Options = 0>
+  EIGEN_DEPRECATED inline JacobiSVD<PlainObject, Options> jacobiSvd(unsigned int computationOptions) const;
+
+  template <int Options = 0>
+  inline BDCSVD<PlainObject, Options> bdcSvd() const;
+  template <int Options = 0>
+  EIGEN_DEPRECATED inline BDCSVD<PlainObject, Options> bdcSvd(unsigned int computationOptions) const;
+
+  /////////// Geometry module ///////////
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC inline typename internal::cross_impl<Derived, OtherDerived>::return_type cross(
+      const MatrixBase<OtherDerived>& other) const;
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC inline PlainObject cross3(const MatrixBase<OtherDerived>& other) const;
+
+  EIGEN_DEVICE_FUNC inline PlainObject unitOrthogonal(void) const;
+
+  EIGEN_DEPRECATED EIGEN_DEVICE_FUNC inline Matrix<Scalar, 3, 1> eulerAngles(Index a0, Index a1, Index a2) const;
+
+  EIGEN_DEVICE_FUNC inline Matrix<Scalar, 3, 1> canonicalEulerAngles(Index a0, Index a1, Index a2) const;
+
+  // put this as separate enum value to work around possible GCC 4.3 bug (?)
+  enum {
+    HomogeneousReturnTypeDirection =
+        ColsAtCompileTime == 1 && RowsAtCompileTime == 1
+            ? ((internal::traits<Derived>::Flags & RowMajorBit) == RowMajorBit ? Horizontal : Vertical)
+        : ColsAtCompileTime == 1 ? Vertical
+                                 : Horizontal
+  };
+  typedef Homogeneous<Derived, HomogeneousReturnTypeDirection> HomogeneousReturnType;
+  EIGEN_DEVICE_FUNC inline HomogeneousReturnType homogeneous() const;
+
+  enum { SizeMinusOne = SizeAtCompileTime == Dynamic ? Dynamic : SizeAtCompileTime - 1 };
+  typedef Block<const Derived, internal::traits<Derived>::ColsAtCompileTime == 1 ? SizeMinusOne : 1,
+                internal::traits<Derived>::ColsAtCompileTime == 1 ? 1 : SizeMinusOne>
+      ConstStartMinusOne;
+  typedef EIGEN_EXPR_BINARYOP_SCALAR_RETURN_TYPE(ConstStartMinusOne, Scalar, quotient) HNormalizedReturnType;
+  EIGEN_DEVICE_FUNC inline const HNormalizedReturnType hnormalized() const;
+
+  ////////// Householder module ///////////
+
+  EIGEN_DEVICE_FUNC void makeHouseholderInPlace(Scalar& tau, RealScalar& beta);
+  template <typename EssentialPart>
+  EIGEN_DEVICE_FUNC void makeHouseholder(EssentialPart& essential, Scalar& tau, RealScalar& beta) const;
+  template <typename EssentialPart>
+  EIGEN_DEVICE_FUNC void applyHouseholderOnTheLeft(const EssentialPart& essential, const Scalar& tau,
+                                                   Scalar* workspace);
+  template <typename EssentialPart>
+  EIGEN_DEVICE_FUNC void applyHouseholderOnTheRight(const EssentialPart& essential, const Scalar& tau,
+                                                    Scalar* workspace);
+
+  ///////// Jacobi module /////////
+
+  template <typename OtherScalar>
+  EIGEN_DEVICE_FUNC void applyOnTheLeft(Index p, Index q, const JacobiRotation<OtherScalar>& j);
+  template <typename OtherScalar>
+  EIGEN_DEVICE_FUNC void applyOnTheRight(Index p, Index q, const JacobiRotation<OtherScalar>& j);
+
+  ///////// SparseCore module /////////
+
+  template <typename OtherDerived>
+  EIGEN_STRONG_INLINE const typename SparseMatrixBase<OtherDerived>::template CwiseProductDenseReturnType<Derived>::Type
+  cwiseProduct(const SparseMatrixBase<OtherDerived>& other) const {
+    return other.cwiseProduct(derived());
+  }
+
+  ///////// MatrixFunctions module /////////
+
+  typedef typename internal::stem_function<Scalar>::type StemFunction;
+#define EIGEN_MATRIX_FUNCTION(ReturnType, Name, Description)                                                        \
+  /** \returns an expression of the matrix Description of \c *this. \brief This function requires the <a            \
+   * href="unsupported/group__MatrixFunctions__Module.html"> unsupported MatrixFunctions module</a>. To compute the \
+   * coefficient-wise Description use ArrayBase::##Name . */                                                        \
+  const ReturnType<Derived> Name() const;
+#define EIGEN_MATRIX_FUNCTION_1(ReturnType, Name, Description, Argument)                                            \
+  /** \returns an expression of the matrix Description of \c *this. \brief This function requires the <a            \
+   * href="unsupported/group__MatrixFunctions__Module.html"> unsupported MatrixFunctions module</a>. To compute the \
+   * coefficient-wise Description use ArrayBase::##Name . */                                                        \
+  const ReturnType<Derived> Name(Argument) const;
+
+  EIGEN_MATRIX_FUNCTION(MatrixExponentialReturnValue, exp, exponential)
+  /** \brief Helper function for the <a href="unsupported/group__MatrixFunctions__Module.html"> unsupported
+   * MatrixFunctions module</a>.*/
+  const MatrixFunctionReturnValue<Derived> matrixFunction(StemFunction f) const;
+  EIGEN_MATRIX_FUNCTION(MatrixFunctionReturnValue, cosh, hyperbolic cosine)
+  EIGEN_MATRIX_FUNCTION(MatrixFunctionReturnValue, sinh, hyperbolic sine)
+  EIGEN_MATRIX_FUNCTION(MatrixFunctionReturnValue, atanh, inverse hyperbolic cosine)
+  EIGEN_MATRIX_FUNCTION(MatrixFunctionReturnValue, acosh, inverse hyperbolic cosine)
+  EIGEN_MATRIX_FUNCTION(MatrixFunctionReturnValue, asinh, inverse hyperbolic sine)
+  EIGEN_MATRIX_FUNCTION(MatrixFunctionReturnValue, cos, cosine)
+  EIGEN_MATRIX_FUNCTION(MatrixFunctionReturnValue, sin, sine)
+  EIGEN_MATRIX_FUNCTION(MatrixSquareRootReturnValue, sqrt, square root)
+  EIGEN_MATRIX_FUNCTION(MatrixLogarithmReturnValue, log, logarithm)
+  EIGEN_MATRIX_FUNCTION_1(MatrixPowerReturnValue, pow, power to \c p, const RealScalar& p)
+  EIGEN_MATRIX_FUNCTION_1(MatrixComplexPowerReturnValue, pow, power to \c p, const internal::make_complex_t<Scalar>& p)
+
+ protected:
+  EIGEN_DEFAULT_COPY_CONSTRUCTOR(MatrixBase)
+  EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(MatrixBase)
+
+ private:
+  EIGEN_DEVICE_FUNC explicit MatrixBase(int);
+  EIGEN_DEVICE_FUNC MatrixBase(int, int);
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC explicit MatrixBase(const MatrixBase<OtherDerived>&);
+
+ protected:
+  // mixing arrays and matrices is not legal
+  template <typename OtherDerived>
+  Derived& operator+=(const ArrayBase<OtherDerived>&) {
+    EIGEN_STATIC_ASSERT(std::ptrdiff_t(sizeof(typename OtherDerived::Scalar)) == -1,
+                        YOU_CANNOT_MIX_ARRAYS_AND_MATRICES);
+    return *this;
+  }
+  // mixing arrays and matrices is not legal
+  template <typename OtherDerived>
+  Derived& operator-=(const ArrayBase<OtherDerived>&) {
+    EIGEN_STATIC_ASSERT(std::ptrdiff_t(sizeof(typename OtherDerived::Scalar)) == -1,
+                        YOU_CANNOT_MIX_ARRAYS_AND_MATRICES);
+    return *this;
+  }
+};
+
+/***************************************************************************
+ * Implementation of matrix base methods
+ ***************************************************************************/
+
+/** replaces \c *this by \c *this * \a other.
+ *
+ * \returns a reference to \c *this
+ *
+ * Example: \include MatrixBase_applyOnTheRight.cpp
+ * Output: \verbinclude MatrixBase_applyOnTheRight.out
+ */
+template <typename Derived>
+template <typename OtherDerived>
+inline Derived& MatrixBase<Derived>::operator*=(const EigenBase<OtherDerived>& other) {
+  other.derived().applyThisOnTheRight(derived());
+  return derived();
+}
+
+/** replaces \c *this by \c *this * \a other. It is equivalent to MatrixBase::operator*=().
+ *
+ * Example: \include MatrixBase_applyOnTheRight.cpp
+ * Output: \verbinclude MatrixBase_applyOnTheRight.out
+ */
+template <typename Derived>
+template <typename OtherDerived>
+inline void MatrixBase<Derived>::applyOnTheRight(const EigenBase<OtherDerived>& other) {
+  other.derived().applyThisOnTheRight(derived());
+}
+
+/** replaces \c *this by \a other * \c *this.
+ *
+ * Example: \include MatrixBase_applyOnTheLeft.cpp
+ * Output: \verbinclude MatrixBase_applyOnTheLeft.out
+ */
+template <typename Derived>
+template <typename OtherDerived>
+inline void MatrixBase<Derived>::applyOnTheLeft(const EigenBase<OtherDerived>& other) {
+  other.derived().applyThisOnTheLeft(derived());
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_MATRIXBASE_H

eigen-master/Eigen/src/Core/NestByValue.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
+// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_NESTBYVALUE_H
+#define EIGEN_NESTBYVALUE_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+template <typename ExpressionType>
+struct traits<NestByValue<ExpressionType> > : public traits<ExpressionType> {
+  enum { Flags = traits<ExpressionType>::Flags & ~NestByRefBit };
+};
+}  // namespace internal
+
+/** \class NestByValue
+ * \ingroup Core_Module
+ *
+ * \brief Expression which must be nested by value
+ *
+ * \tparam ExpressionType the type of the object of which we are requiring nesting-by-value
+ *
+ * This class is the return type of MatrixBase::nestByValue()
+ * and most of the time this is the only way it is used.
+ *
+ * \sa MatrixBase::nestByValue()
+ */
+template <typename ExpressionType>
+class NestByValue : public internal::dense_xpr_base<NestByValue<ExpressionType> >::type {
+ public:
+  typedef typename internal::dense_xpr_base<NestByValue>::type Base;
+  static constexpr bool HasDirectAccess = internal::has_direct_access<ExpressionType>::ret;
+
+  EIGEN_DENSE_PUBLIC_INTERFACE(NestByValue)
+
+  EIGEN_DEVICE_FUNC explicit inline NestByValue(const ExpressionType& matrix) : m_expression(matrix) {}
+
+  EIGEN_DEVICE_FUNC constexpr Index rows() const noexcept { return m_expression.rows(); }
+  EIGEN_DEVICE_FUNC constexpr Index cols() const noexcept { return m_expression.cols(); }
+
+  EIGEN_DEVICE_FUNC operator const ExpressionType&() const { return m_expression; }
+
+  EIGEN_DEVICE_FUNC const ExpressionType& nestedExpression() const { return m_expression; }
+
+  EIGEN_DEVICE_FUNC typename std::enable_if<HasDirectAccess, const Scalar*>::type data() const {
+    return m_expression.data();
+  }
+
+  EIGEN_DEVICE_FUNC typename std::enable_if<HasDirectAccess, Index>::type innerStride() const {
+    return m_expression.innerStride();
+  }
+
+  EIGEN_DEVICE_FUNC typename std::enable_if<HasDirectAccess, Index>::type outerStride() const {
+    return m_expression.outerStride();
+  }
+
+ protected:
+  const ExpressionType m_expression;
+};
+
+/** \returns an expression of the temporary version of *this.
+ */
+template <typename Derived>
+EIGEN_DEVICE_FUNC inline const NestByValue<Derived> DenseBase<Derived>::nestByValue() const {
+  return NestByValue<Derived>(derived());
+}
+
+namespace internal {
+
+// Evaluator of Solve -> eval into a temporary
+template <typename ArgType>
+struct evaluator<NestByValue<ArgType> > : public evaluator<ArgType> {
+  typedef evaluator<ArgType> Base;
+
+  EIGEN_DEVICE_FUNC explicit evaluator(const NestByValue<ArgType>& xpr) : Base(xpr.nestedExpression()) {}
+};
+}  // namespace internal
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_NESTBYVALUE_H

eigen-master/Eigen/src/Core/NoAlias.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_NOALIAS_H
+#define EIGEN_NOALIAS_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+/** \class NoAlias
+ * \ingroup Core_Module
+ *
+ * \brief Pseudo expression providing an operator = assuming no aliasing
+ *
+ * \tparam ExpressionType the type of the object on which to do the lazy assignment
+ *
+ * This class represents an expression with special assignment operators
+ * assuming no aliasing between the target expression and the source expression.
+ * More precisely it alloas to bypass the EvalBeforeAssignBit flag of the source expression.
+ * It is the return type of MatrixBase::noalias()
+ * and most of the time this is the only way it is used.
+ *
+ * \sa MatrixBase::noalias()
+ */
+template <typename ExpressionType, template <typename> class StorageBase>
+class NoAlias {
+ public:
+  typedef typename ExpressionType::Scalar Scalar;
+
+  EIGEN_DEVICE_FUNC explicit NoAlias(ExpressionType& expression) : m_expression(expression) {}
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE ExpressionType& operator=(const StorageBase<OtherDerived>& other) {
+    call_assignment_no_alias(m_expression, other.derived(),
+                             internal::assign_op<Scalar, typename OtherDerived::Scalar>());
+    return m_expression;
+  }
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE ExpressionType& operator+=(const StorageBase<OtherDerived>& other) {
+    call_assignment_no_alias(m_expression, other.derived(),
+                             internal::add_assign_op<Scalar, typename OtherDerived::Scalar>());
+    return m_expression;
+  }
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE ExpressionType& operator-=(const StorageBase<OtherDerived>& other) {
+    call_assignment_no_alias(m_expression, other.derived(),
+                             internal::sub_assign_op<Scalar, typename OtherDerived::Scalar>());
+    return m_expression;
+  }
+
+  EIGEN_DEVICE_FUNC ExpressionType& expression() const { return m_expression; }
+
+ protected:
+  ExpressionType& m_expression;
+};
+
+/** \returns a pseudo expression of \c *this with an operator= assuming
+ * no aliasing between \c *this and the source expression.
+ *
+ * More precisely, noalias() allows to bypass the EvalBeforeAssignBit flag.
+ * Currently, even though several expressions may alias, only product
+ * expressions have this flag. Therefore, noalias() is only useful when
+ * the source expression contains a matrix product.
+ *
+ * Here are some examples where noalias is useful:
+ * \code
+ * D.noalias()  = A * B;
+ * D.noalias() += A.transpose() * B;
+ * D.noalias() -= 2 * A * B.adjoint();
+ * \endcode
+ *
+ * On the other hand the following example will lead to a \b wrong result:
+ * \code
+ * A.noalias() = A * B;
+ * \endcode
+ * because the result matrix A is also an operand of the matrix product. Therefore,
+ * there is no alternative than evaluating A * B in a temporary, that is the default
+ * behavior when you write:
+ * \code
+ * A = A * B;
+ * \endcode
+ *
+ * \sa class NoAlias
+ */
+template <typename Derived>
+NoAlias<Derived, MatrixBase> EIGEN_DEVICE_FUNC MatrixBase<Derived>::noalias() {
+  return NoAlias<Derived, Eigen::MatrixBase>(derived());
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_NOALIAS_H

eigen-master/Eigen/src/Core/NumTraits.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2006-2010 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_NUMTRAITS_H
+#define EIGEN_NUMTRAITS_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+// default implementation of digits(), based on numeric_limits if specialized,
+// 0 for integer types, and log2(epsilon()) otherwise.
+template <typename T, bool use_numeric_limits = std::numeric_limits<T>::is_specialized,
+          bool is_integer = NumTraits<T>::IsInteger>
+struct default_digits_impl {
+  EIGEN_DEVICE_FUNC constexpr static int run() { return std::numeric_limits<T>::digits; }
+};
+
+template <typename T>
+struct default_digits_impl<T, false, false>  // Floating point
+{
+  EIGEN_DEVICE_FUNC constexpr static int run() {
+    using std::ceil;
+    using std::log2;
+    typedef typename NumTraits<T>::Real Real;
+    return int(ceil(-log2(NumTraits<Real>::epsilon())));
+  }
+};
+
+template <typename T>
+struct default_digits_impl<T, false, true>  // Integer
+{
+  EIGEN_DEVICE_FUNC constexpr static int run() { return 0; }
+};
+
+// default implementation of digits10(), based on numeric_limits if specialized,
+// 0 for integer types, and floor((digits()-1)*log10(2)) otherwise.
+template <typename T, bool use_numeric_limits = std::numeric_limits<T>::is_specialized,
+          bool is_integer = NumTraits<T>::IsInteger>
+struct default_digits10_impl {
+  EIGEN_DEVICE_FUNC constexpr static int run() { return std::numeric_limits<T>::digits10; }
+};
+
+template <typename T>
+struct default_digits10_impl<T, false, false>  // Floating point
+{
+  EIGEN_DEVICE_FUNC constexpr static int run() {
+    using std::floor;
+    using std::log10;
+    typedef typename NumTraits<T>::Real Real;
+    return int(floor((internal::default_digits_impl<Real>::run() - 1) * log10(2)));
+  }
+};
+
+template <typename T>
+struct default_digits10_impl<T, false, true>  // Integer
+{
+  EIGEN_DEVICE_FUNC constexpr static int run() { return 0; }
+};
+
+// default implementation of max_digits10(), based on numeric_limits if specialized,
+// 0 for integer types, and log10(2) * digits() + 1 otherwise.
+template <typename T, bool use_numeric_limits = std::numeric_limits<T>::is_specialized,
+          bool is_integer = NumTraits<T>::IsInteger>
+struct default_max_digits10_impl {
+  EIGEN_DEVICE_FUNC constexpr static int run() { return std::numeric_limits<T>::max_digits10; }
+};
+
+template <typename T>
+struct default_max_digits10_impl<T, false, false>  // Floating point
+{
+  EIGEN_DEVICE_FUNC constexpr static int run() {
+    using std::ceil;
+    using std::log10;
+    typedef typename NumTraits<T>::Real Real;
+    return int(ceil(internal::default_digits_impl<Real>::run() * log10(2) + 1));
+  }
+};
+
+template <typename T>
+struct default_max_digits10_impl<T, false, true>  // Integer
+{
+  EIGEN_DEVICE_FUNC constexpr static int run() { return 0; }
+};
+
+}  // end namespace internal
+
+namespace numext {
+/** \internal bit-wise cast without changing the underlying bit representation. */
+
+// TODO: Replace by std::bit_cast (available in C++20)
+template <typename Tgt, typename Src>
+EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC Tgt bit_cast(const Src& src) {
+  // The behaviour of memcpy is not specified for non-trivially copyable types
+  EIGEN_STATIC_ASSERT(std::is_trivially_copyable<Src>::value, THIS_TYPE_IS_NOT_SUPPORTED)
+  EIGEN_STATIC_ASSERT(std::is_trivially_copyable<Tgt>::value && std::is_default_constructible<Tgt>::value,
+                      THIS_TYPE_IS_NOT_SUPPORTED)
+  EIGEN_STATIC_ASSERT(sizeof(Src) == sizeof(Tgt), THIS_TYPE_IS_NOT_SUPPORTED)
+
+  Tgt tgt;
+  // Load src into registers first. This allows the memcpy to be elided by CUDA.
+  const Src staged = src;
+  EIGEN_USING_STD(memcpy)
+  memcpy(static_cast<void*>(&tgt), static_cast<const void*>(&staged), sizeof(Tgt));
+  return tgt;
+}
+}  // namespace numext
+
+// clang-format off
+/** \class NumTraits
+ * \ingroup Core_Module
+ *
+ * \brief Holds information about the various numeric (i.e. scalar) types allowed by Eigen.
+ *
+ * \tparam T the numeric type at hand
+ *
+ * This class stores enums, typedefs and static methods giving information about a numeric type.
+ *
+ * The provided data consists of:
+ * \li A typedef \c Real, giving the "real part" type of \a T. If \a T is already real,
+ *     then \c Real is just a typedef to \a T. If \a T is `std::complex<U>` then \c Real
+ *     is a typedef to \a U.
+ * \li A typedef \c NonInteger, giving the type that should be used for operations producing non-integral values,
+ *     such as quotients, square roots, etc. If \a T is a floating-point type, then this typedef just gives
+ *     \a T again. Note however that many Eigen functions such as internal::sqrt simply refuse to
+ *     take integers. Outside of a few cases, Eigen doesn't do automatic type promotion. Thus, this typedef is
+ *     only intended as a helper for code that needs to explicitly promote types.
+ * \li A typedef \c Literal giving the type to use for numeric literals such as "2" or "0.5". For instance, for
+ *     `std::complex<U>`, Literal is defined as \a U. Of course, this type must be fully compatible with \a T. In doubt,
+ *     just use \a T here.
+ * \li A typedef \c Nested giving the type to use to nest a value inside of the expression tree. If you don't know what
+ *     this means, just use \a T here.
+ * \li An enum value \c IsComplex. It is equal to 1 if \a T is a \c std::complex type, and to 0 otherwise.
+ * \li An enum value \c IsInteger. It is equal to \c 1 if \a T is an integer type such as \c int, and to \c 0 otherwise.
+ * \li Enum values \c ReadCost, \c AddCost and \c MulCost representing a rough estimate of the number of CPU cycles needed to by
+ *     move / add / mul instructions respectively, assuming the data is already stored in CPU registers. Stay vague here.
+ *     No need to do architecture-specific stuff. If you don't know what this means, just use \c Eigen::HugeCost.
+ * \li An enum value \c IsSigned. It is equal to \c 1 if \a T is a signed type and to 0 if \a T is unsigned.
+ * \li An enum value \c RequireInitialization. It is equal to \c 1 if the constructor of the numeric type \a T must be
+ *     called, and to 0 if it is safe not to call it. Default is 0 if \a T is an arithmetic type, and 1 otherwise.
+ * \li An epsilon() function which, unlike <a href="http://en.cppreference.com/w/cpp/types/numeric_limits/epsilon">
+ *     `std::numeric_limits::epsilon()`</a>, it returns a \c Real instead of a \a T.
+ * \li A dummy_precision() function returning a weak epsilon value. It is mainly used as a default value by the fuzzy
+ *     comparison operators.
+ * \li highest() and lowest() functions returning the highest and lowest possible values respectively.
+ * \li digits() function returning the number of radix digits (non-sign digits for integers, mantissa for floating-point).
+ *     This is the analogue of <a href="http://en.cppreference.com/w/cpp/types/numeric_limits/digits">
+ *     `std::numeric_limits<T>::digits`</a> which is used as the default implementation if specialized.
+ * \li digits10() function returning the number of decimal digits that can be represented without change. This is the
+ *     analogue of <a href="http://en.cppreference.com/w/cpp/types/numeric_limits/digits10">
+ *     `std::numeric_limits<T>::digits10`</a> which is used as the default implementation if specialized.
+ * \li max_digits10() function returning the number of decimal digits required to uniquely represent all distinct values
+ *     of the type. This is the analogue of <a
+ *     href="http://en.cppreference.com/w/cpp/types/numeric_limits/max_digits10">`std::numeric_limits<T>::max_digits10`</a>
+ *     which is used as the default implementation if specialized.
+ * \li min_exponent() and max_exponent() functions returning the highest and lowest possible values, respectively,
+ *     such that the radix raised to the power exponent-1 is a normalized floating-point number.  These are equivalent
+ *     to <a href="http://en.cppreference.com/w/cpp/types/numeric_limits/min_exponent">
+ *     `std::numeric_limits<T>::min_exponent`</a>/<a
+ *     href="http://en.cppreference.com/w/cpp/types/numeric_limits/max_exponent">`std::numeric_limits<T>::max_exponent`</a>.
+ * \li infinity() function returning a representation of positive infinity, if available.
+ * \li quiet_NaN() function returning a non-signaling "not-a-number", if available.
+ */
+// clang-format on
+template <typename T>
+struct GenericNumTraits {
+  enum {
+    IsInteger = std::numeric_limits<T>::is_integer,
+    IsSigned = std::numeric_limits<T>::is_signed,
+    IsComplex = 0,
+    RequireInitialization = internal::is_arithmetic<T>::value ? 0 : 1,
+    ReadCost = 1,
+    AddCost = 1,
+    MulCost = 1
+  };
+
+  typedef T Real;
+  typedef std::conditional_t<IsInteger, std::conditional_t<sizeof(T) <= 2, float, double>, T> NonInteger;
+  typedef T Nested;
+  typedef T Literal;
+
+  EIGEN_DEVICE_FUNC constexpr static Real epsilon() { return numext::numeric_limits<T>::epsilon(); }
+
+  EIGEN_DEVICE_FUNC constexpr static int digits10() { return internal::default_digits10_impl<T>::run(); }
+
+  EIGEN_DEVICE_FUNC constexpr static int max_digits10() { return internal::default_max_digits10_impl<T>::run(); }
+
+  EIGEN_DEVICE_FUNC constexpr static int digits() { return internal::default_digits_impl<T>::run(); }
+
+  EIGEN_DEVICE_FUNC constexpr static int min_exponent() { return numext::numeric_limits<T>::min_exponent; }
+
+  EIGEN_DEVICE_FUNC constexpr static int max_exponent() { return numext::numeric_limits<T>::max_exponent; }
+
+  EIGEN_DEVICE_FUNC constexpr static Real dummy_precision() {
+    // make sure to override this for floating-point types
+    return Real(0);
+  }
+
+  EIGEN_DEVICE_FUNC constexpr static T highest() { return (numext::numeric_limits<T>::max)(); }
+
+  EIGEN_DEVICE_FUNC constexpr static T lowest() { return (numext::numeric_limits<T>::lowest)(); }
+
+  EIGEN_DEVICE_FUNC constexpr static T infinity() { return numext::numeric_limits<T>::infinity(); }
+
+  EIGEN_DEVICE_FUNC constexpr static T quiet_NaN() { return numext::numeric_limits<T>::quiet_NaN(); }
+};
+
+template <typename T>
+struct NumTraits : GenericNumTraits<T> {};
+
+template <>
+struct NumTraits<float> : GenericNumTraits<float> {
+  EIGEN_DEVICE_FUNC constexpr static float dummy_precision() { return 1e-5f; }
+};
+
+template <>
+struct NumTraits<double> : GenericNumTraits<double> {
+  EIGEN_DEVICE_FUNC constexpr static double dummy_precision() { return 1e-12; }
+};
+
+// GPU devices treat `long double` as `double`.
+#ifndef EIGEN_GPU_COMPILE_PHASE
+template <>
+struct NumTraits<long double> : GenericNumTraits<long double> {
+  EIGEN_DEVICE_FUNC constexpr static long double dummy_precision() { return static_cast<long double>(1e-15l); }
+
+#if defined(EIGEN_ARCH_PPC) && (__LDBL_MANT_DIG__ == 106)
+  // PowerPC double double causes issues with some values
+  EIGEN_DEVICE_FUNC constexpr static long double epsilon() {
+    // 2^(-(__LDBL_MANT_DIG__)+1)
+    return static_cast<long double>(2.4651903288156618919116517665087e-32l);
+  }
+#endif
+};
+#endif
+
+template <typename Real_>
+struct NumTraits<std::complex<Real_> > : GenericNumTraits<std::complex<Real_> > {
+  typedef Real_ Real;
+  typedef typename NumTraits<Real_>::Literal Literal;
+  enum {
+    IsComplex = 1,
+    IsSigned = NumTraits<Real_>::IsSigned,
+    RequireInitialization = NumTraits<Real_>::RequireInitialization,
+    ReadCost = 2 * NumTraits<Real_>::ReadCost,
+    AddCost = 2 * NumTraits<Real>::AddCost,
+    MulCost = 4 * NumTraits<Real>::MulCost + 2 * NumTraits<Real>::AddCost
+  };
+
+  EIGEN_DEVICE_FUNC constexpr static Real epsilon() { return NumTraits<Real>::epsilon(); }
+  EIGEN_DEVICE_FUNC constexpr static Real dummy_precision() { return NumTraits<Real>::dummy_precision(); }
+  EIGEN_DEVICE_FUNC constexpr static int digits10() { return NumTraits<Real>::digits10(); }
+  EIGEN_DEVICE_FUNC constexpr static int max_digits10() { return NumTraits<Real>::max_digits10(); }
+};
+
+template <typename Scalar, int Rows, int Cols, int Options, int MaxRows, int MaxCols>
+struct NumTraits<Array<Scalar, Rows, Cols, Options, MaxRows, MaxCols> > {
+  typedef Array<Scalar, Rows, Cols, Options, MaxRows, MaxCols> ArrayType;
+  typedef typename NumTraits<Scalar>::Real RealScalar;
+  typedef Array<RealScalar, Rows, Cols, Options, MaxRows, MaxCols> Real;
+  typedef typename NumTraits<Scalar>::NonInteger NonIntegerScalar;
+  typedef Array<NonIntegerScalar, Rows, Cols, Options, MaxRows, MaxCols> NonInteger;
+  typedef ArrayType& Nested;
+  typedef typename NumTraits<Scalar>::Literal Literal;
+
+  enum {
+    IsComplex = NumTraits<Scalar>::IsComplex,
+    IsInteger = NumTraits<Scalar>::IsInteger,
+    IsSigned = NumTraits<Scalar>::IsSigned,
+    RequireInitialization = 1,
+    ReadCost = ArrayType::SizeAtCompileTime == Dynamic
+                   ? HugeCost
+                   : ArrayType::SizeAtCompileTime * int(NumTraits<Scalar>::ReadCost),
+    AddCost = ArrayType::SizeAtCompileTime == Dynamic ? HugeCost
+                                                      : ArrayType::SizeAtCompileTime * int(NumTraits<Scalar>::AddCost),
+    MulCost = ArrayType::SizeAtCompileTime == Dynamic ? HugeCost
+                                                      : ArrayType::SizeAtCompileTime * int(NumTraits<Scalar>::MulCost)
+  };
+
+  EIGEN_DEVICE_FUNC constexpr static RealScalar epsilon() { return NumTraits<RealScalar>::epsilon(); }
+  EIGEN_DEVICE_FUNC constexpr static RealScalar dummy_precision() { return NumTraits<RealScalar>::dummy_precision(); }
+
+  constexpr static int digits10() { return NumTraits<Scalar>::digits10(); }
+  constexpr static int max_digits10() { return NumTraits<Scalar>::max_digits10(); }
+};
+
+template <>
+struct NumTraits<std::string> : GenericNumTraits<std::string> {
+  enum { RequireInitialization = 1, ReadCost = HugeCost, AddCost = HugeCost, MulCost = HugeCost };
+
+  constexpr static int digits10() { return 0; }
+  constexpr static int max_digits10() { return 0; }
+
+ private:
+  static inline std::string epsilon();
+  static inline std::string dummy_precision();
+  static inline std::string lowest();
+  static inline std::string highest();
+  static inline std::string infinity();
+  static inline std::string quiet_NaN();
+};
+
+// Empty specialization for void to allow template specialization based on NumTraits<T>::Real with T==void and SFINAE.
+template <>
+struct NumTraits<void> {};
+
+template <>
+struct NumTraits<bool> : GenericNumTraits<bool> {};
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_NUMTRAITS_H

eigen-master/Eigen/src/Core/PartialReduxEvaluator.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2011-2018 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_PARTIALREDUX_H
+#define EIGEN_PARTIALREDUX_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+/***************************************************************************
+ *
+ * This file provides evaluators for partial reductions.
+ * There are two modes:
+ *
+ *  - scalar path: simply calls the respective function on the column or row.
+ *    -> nothing special here, all the tricky part is handled by the return
+ *       types of VectorwiseOp's members. They embed the functor calling the
+ *       respective DenseBase's member function.
+ *
+ *  - vectorized path: implements a packet-wise reductions followed by
+ *    some (optional) processing of the outcome, e.g., division by n for mean.
+ *
+ * For the vectorized path let's observe that the packet-size and outer-unrolling
+ * are both decided by the assignment logic. So all we have to do is to decide
+ * on the inner unrolling.
+ *
+ * For the unrolling, we can reuse "internal::redux_vec_unroller" from Redux.h,
+ * but be need to be careful to specify correct increment.
+ *
+ ***************************************************************************/
+
+/* logic deciding a strategy for unrolling of vectorized paths */
+template <typename Func, typename Evaluator>
+struct packetwise_redux_traits {
+  enum {
+    OuterSize = int(Evaluator::IsRowMajor) ? Evaluator::RowsAtCompileTime : Evaluator::ColsAtCompileTime,
+    Cost = OuterSize == Dynamic ? HugeCost
+                                : OuterSize * Evaluator::CoeffReadCost + (OuterSize - 1) * functor_traits<Func>::Cost,
+    Unrolling = Cost <= EIGEN_UNROLLING_LIMIT ? CompleteUnrolling : NoUnrolling
+  };
+};
+
+/* Value to be returned when size==0 , by default let's return 0 */
+template <typename PacketType, typename Func>
+EIGEN_DEVICE_FUNC PacketType packetwise_redux_empty_value(const Func&) {
+  const typename unpacket_traits<PacketType>::type zero(0);
+  return pset1<PacketType>(zero);
+}
+
+/* For products the default is 1 */
+template <typename PacketType, typename Scalar>
+EIGEN_DEVICE_FUNC PacketType packetwise_redux_empty_value(const scalar_product_op<Scalar, Scalar>&) {
+  return pset1<PacketType>(Scalar(1));
+}
+
+/* Perform the actual reduction */
+template <typename Func, typename Evaluator, int Unrolling = packetwise_redux_traits<Func, Evaluator>::Unrolling>
+struct packetwise_redux_impl;
+
+/* Perform the actual reduction with unrolling */
+template <typename Func, typename Evaluator>
+struct packetwise_redux_impl<Func, Evaluator, CompleteUnrolling> {
+  typedef redux_novec_unroller<Func, Evaluator, 0, Evaluator::SizeAtCompileTime> Base;
+  typedef typename Evaluator::Scalar Scalar;
+
+  template <typename PacketType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE PacketType run(const Evaluator& eval, const Func& func, Index /*size*/) {
+    return redux_vec_unroller<Func, Evaluator, 0,
+                              packetwise_redux_traits<Func, Evaluator>::OuterSize>::template run<PacketType>(eval,
+                                                                                                             func);
+  }
+};
+
+/* Add a specialization of redux_vec_unroller for size==0 at compiletime.
+ * This specialization is not required for general reductions, which is
+ * why it is defined here.
+ */
+template <typename Func, typename Evaluator, Index Start>
+struct redux_vec_unroller<Func, Evaluator, Start, 0> {
+  template <typename PacketType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE PacketType run(const Evaluator&, const Func& f) {
+    return packetwise_redux_empty_value<PacketType>(f);
+  }
+};
+
+/* Perform the actual reduction for dynamic sizes */
+template <typename Func, typename Evaluator>
+struct packetwise_redux_impl<Func, Evaluator, NoUnrolling> {
+  typedef typename Evaluator::Scalar Scalar;
+  typedef typename redux_traits<Func, Evaluator>::PacketType PacketScalar;
+
+  template <typename PacketType>
+  EIGEN_DEVICE_FUNC static PacketType run(const Evaluator& eval, const Func& func, Index size) {
+    if (size == 0) return packetwise_redux_empty_value<PacketType>(func);
+
+    const Index size4 = 1 + numext::round_down(size - 1, 4);
+    PacketType p = eval.template packetByOuterInner<Unaligned, PacketType>(0, 0);
+    // This loop is optimized for instruction pipelining:
+    // - each iteration generates two independent instructions
+    // - thanks to branch prediction and out-of-order execution we have independent instructions across loops
+    for (Index i = 1; i < size4; i += 4)
+      p = func.packetOp(
+          p, func.packetOp(func.packetOp(eval.template packetByOuterInner<Unaligned, PacketType>(i + 0, 0),
+                                         eval.template packetByOuterInner<Unaligned, PacketType>(i + 1, 0)),
+                           func.packetOp(eval.template packetByOuterInner<Unaligned, PacketType>(i + 2, 0),
+                                         eval.template packetByOuterInner<Unaligned, PacketType>(i + 3, 0))));
+    for (Index i = size4; i < size; ++i)
+      p = func.packetOp(p, eval.template packetByOuterInner<Unaligned, PacketType>(i, 0));
+    return p;
+  }
+};
+
+template <typename Func, typename Evaluator>
+struct packetwise_segment_redux_impl {
+  typedef typename Evaluator::Scalar Scalar;
+  typedef typename redux_traits<Func, Evaluator>::PacketType PacketScalar;
+
+  template <typename PacketType>
+  EIGEN_DEVICE_FUNC static PacketType run(const Evaluator& eval, const Func& func, Index size, Index begin,
+                                          Index count) {
+    if (size == 0) return packetwise_redux_empty_value<PacketType>(func);
+
+    PacketType p = eval.template packetSegmentByOuterInner<Unaligned, PacketType>(0, 0, begin, count);
+    for (Index i = 1; i < size; ++i)
+      p = func.packetOp(p, eval.template packetSegmentByOuterInner<Unaligned, PacketType>(i, 0, begin, count));
+    return p;
+  }
+};
+
+template <typename ArgType, typename MemberOp, int Direction>
+struct evaluator<PartialReduxExpr<ArgType, MemberOp, Direction> >
+    : evaluator_base<PartialReduxExpr<ArgType, MemberOp, Direction> > {
+  typedef PartialReduxExpr<ArgType, MemberOp, Direction> XprType;
+  typedef typename internal::nested_eval<ArgType, 1>::type ArgTypeNested;
+  typedef add_const_on_value_type_t<ArgTypeNested> ConstArgTypeNested;
+  typedef internal::remove_all_t<ArgTypeNested> ArgTypeNestedCleaned;
+  typedef typename ArgType::Scalar InputScalar;
+  typedef typename XprType::Scalar Scalar;
+  enum {
+    TraversalSize = Direction == int(Vertical) ? int(ArgType::RowsAtCompileTime) : int(ArgType::ColsAtCompileTime)
+  };
+  typedef typename MemberOp::template Cost<int(TraversalSize)> CostOpType;
+  enum {
+    CoeffReadCost = TraversalSize == Dynamic ? HugeCost
+                    : TraversalSize == 0
+                        ? 1
+                        : int(TraversalSize) * int(evaluator<ArgType>::CoeffReadCost) + int(CostOpType::value),
+
+    ArgFlags_ = evaluator<ArgType>::Flags,
+
+    Vectorizable_ = bool(int(ArgFlags_) & PacketAccessBit) && bool(MemberOp::Vectorizable) &&
+                    (Direction == int(Vertical) ? bool(ArgFlags_ & RowMajorBit) : (ArgFlags_ & RowMajorBit) == 0) &&
+                    (TraversalSize != 0),
+
+    Flags = (traits<XprType>::Flags & RowMajorBit) | (evaluator<ArgType>::Flags & (HereditaryBits & (~RowMajorBit))) |
+            (Vectorizable_ ? PacketAccessBit : 0) | LinearAccessBit,
+
+    Alignment = 0  // FIXME this will need to be improved once PartialReduxExpr is vectorized
+  };
+
+  EIGEN_DEVICE_FUNC explicit evaluator(const XprType xpr) : m_arg(xpr.nestedExpression()), m_functor(xpr.functor()) {
+    EIGEN_INTERNAL_CHECK_COST_VALUE(TraversalSize == Dynamic ? HugeCost
+                                                             : (TraversalSize == 0 ? 1 : int(CostOpType::value)));
+    EIGEN_INTERNAL_CHECK_COST_VALUE(CoeffReadCost);
+  }
+
+  typedef typename XprType::CoeffReturnType CoeffReturnType;
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Scalar coeff(Index i, Index j) const {
+    return coeff(Direction == Vertical ? j : i);
+  }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Scalar coeff(Index index) const {
+    return m_functor(m_arg.template subVector<DirectionType(Direction)>(index));
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PacketType packet(Index i, Index j) const {
+    return packet<LoadMode, PacketType>(Direction == Vertical ? j : i);
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC PacketType packet(Index idx) const {
+    static constexpr int PacketSize = internal::unpacket_traits<PacketType>::size;
+    static constexpr int PanelRows = Direction == Vertical ? ArgType::RowsAtCompileTime : PacketSize;
+    static constexpr int PanelCols = Direction == Vertical ? PacketSize : ArgType::ColsAtCompileTime;
+    using PanelType = Block<const ArgTypeNestedCleaned, PanelRows, PanelCols, true /* InnerPanel */>;
+    using PanelEvaluator = typename internal::redux_evaluator<PanelType>;
+    using BinaryOp = typename MemberOp::BinaryOp;
+    using Impl = internal::packetwise_redux_impl<BinaryOp, PanelEvaluator>;
+
+    // FIXME
+    // See bug 1612, currently if PacketSize==1 (i.e. complex<double> with 128bits registers) then the storage-order of
+    // panel get reversed and methods like packetByOuterInner do not make sense anymore in this context. So let's just
+    // by pass "vectorization" in this case:
+    if (PacketSize == 1) return internal::pset1<PacketType>(coeff(idx));
+
+    Index startRow = Direction == Vertical ? 0 : idx;
+    Index startCol = Direction == Vertical ? idx : 0;
+    Index numRows = Direction == Vertical ? m_arg.rows() : PacketSize;
+    Index numCols = Direction == Vertical ? PacketSize : m_arg.cols();
+
+    PanelType panel(m_arg, startRow, startCol, numRows, numCols);
+    PanelEvaluator panel_eval(panel);
+    PacketType p = Impl::template run<PacketType>(panel_eval, m_functor.binaryFunc(), m_arg.outerSize());
+    return p;
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PacketType packetSegment(Index i, Index j, Index begin, Index count) const {
+    return packetSegment<LoadMode, PacketType>(Direction == Vertical ? j : i, begin, count);
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC PacketType packetSegment(Index idx, Index begin, Index count) const {
+    static constexpr int PanelRows = Direction == Vertical ? ArgType::RowsAtCompileTime : Dynamic;
+    static constexpr int PanelCols = Direction == Vertical ? Dynamic : ArgType::ColsAtCompileTime;
+    using PanelType = Block<const ArgTypeNestedCleaned, PanelRows, PanelCols, true /* InnerPanel */>;
+    using PanelEvaluator = typename internal::redux_evaluator<PanelType>;
+    using BinaryOp = typename MemberOp::BinaryOp;
+    using Impl = internal::packetwise_segment_redux_impl<BinaryOp, PanelEvaluator>;
+
+    Index startRow = Direction == Vertical ? 0 : idx;
+    Index startCol = Direction == Vertical ? idx : 0;
+    Index numRows = Direction == Vertical ? m_arg.rows() : begin + count;
+    Index numCols = Direction == Vertical ? begin + count : m_arg.cols();
+
+    PanelType panel(m_arg, startRow, startCol, numRows, numCols);
+    PanelEvaluator panel_eval(panel);
+    PacketType p = Impl::template run<PacketType>(panel_eval, m_functor.binaryFunc(), m_arg.outerSize(), begin, count);
+    return p;
+  }
+
+ protected:
+  ConstArgTypeNested m_arg;
+  const MemberOp m_functor;
+};
+
+}  // end namespace internal
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_PARTIALREDUX_H

eigen-master/Eigen/src/Core/PermutationMatrix.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
+// Copyright (C) 2009-2015 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_PERMUTATIONMATRIX_H
+#define EIGEN_PERMUTATIONMATRIX_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+enum PermPermProduct_t { PermPermProduct };
+
+}  // end namespace internal
+
+/** \class PermutationBase
+ * \ingroup Core_Module
+ *
+ * \brief Base class for permutations
+ *
+ * \tparam Derived the derived class
+ *
+ * This class is the base class for all expressions representing a permutation matrix,
+ * internally stored as a vector of integers.
+ * The convention followed here is that if \f$ \sigma \f$ is a permutation, the corresponding permutation matrix
+ * \f$ P_\sigma \f$ is such that if \f$ (e_1,\ldots,e_p) \f$ is the canonical basis, we have:
+ *  \f[ P_\sigma(e_i) = e_{\sigma(i)}. \f]
+ * This convention ensures that for any two permutations \f$ \sigma, \tau \f$, we have:
+ *  \f[ P_{\sigma\circ\tau} = P_\sigma P_\tau. \f]
+ *
+ * Permutation matrices are square and invertible.
+ *
+ * Notice that in addition to the member functions and operators listed here, there also are non-member
+ * operator* to multiply any kind of permutation object with any kind of matrix expression (MatrixBase)
+ * on either side.
+ *
+ * \sa class PermutationMatrix, class PermutationWrapper
+ */
+template <typename Derived>
+class PermutationBase : public EigenBase<Derived> {
+  typedef internal::traits<Derived> Traits;
+  typedef EigenBase<Derived> Base;
+
+ public:
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  typedef typename Traits::IndicesType IndicesType;
+  enum {
+    Flags = Traits::Flags,
+    RowsAtCompileTime = Traits::RowsAtCompileTime,
+    ColsAtCompileTime = Traits::ColsAtCompileTime,
+    MaxRowsAtCompileTime = Traits::MaxRowsAtCompileTime,
+    MaxColsAtCompileTime = Traits::MaxColsAtCompileTime
+  };
+  typedef typename Traits::StorageIndex StorageIndex;
+  typedef Matrix<StorageIndex, RowsAtCompileTime, ColsAtCompileTime, 0, MaxRowsAtCompileTime, MaxColsAtCompileTime>
+      DenseMatrixType;
+  typedef PermutationMatrix<IndicesType::SizeAtCompileTime, IndicesType::MaxSizeAtCompileTime, StorageIndex>
+      PlainPermutationType;
+  typedef PlainPermutationType PlainObject;
+  using Base::derived;
+  typedef Inverse<Derived> InverseReturnType;
+  typedef void Scalar;
+#endif
+
+  /** Copies the other permutation into *this */
+  template <typename OtherDerived>
+  Derived& operator=(const PermutationBase<OtherDerived>& other) {
+    indices() = other.indices();
+    return derived();
+  }
+
+  /** Assignment from the Transpositions \a tr */
+  template <typename OtherDerived>
+  Derived& operator=(const TranspositionsBase<OtherDerived>& tr) {
+    setIdentity(tr.size());
+    for (Index k = size() - 1; k >= 0; --k) applyTranspositionOnTheRight(k, tr.coeff(k));
+    return derived();
+  }
+
+  /** \returns the number of rows */
+  inline EIGEN_DEVICE_FUNC Index rows() const { return Index(indices().size()); }
+
+  /** \returns the number of columns */
+  inline EIGEN_DEVICE_FUNC Index cols() const { return Index(indices().size()); }
+
+  /** \returns the size of a side of the respective square matrix, i.e., the number of indices */
+  inline EIGEN_DEVICE_FUNC Index size() const { return Index(indices().size()); }
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  template <typename DenseDerived>
+  void evalTo(MatrixBase<DenseDerived>& other) const {
+    other.setZero();
+    for (Index i = 0; i < rows(); ++i) other.coeffRef(indices().coeff(i), i) = typename DenseDerived::Scalar(1);
+  }
+#endif
+
+  /** \returns a Matrix object initialized from this permutation matrix. Notice that it
+   * is inefficient to return this Matrix object by value. For efficiency, favor using
+   * the Matrix constructor taking EigenBase objects.
+   */
+  DenseMatrixType toDenseMatrix() const { return derived(); }
+
+  /** const version of indices(). */
+  const IndicesType& indices() const { return derived().indices(); }
+  /** \returns a reference to the stored array representing the permutation. */
+  IndicesType& indices() { return derived().indices(); }
+
+  /** Resizes to given size.
+   */
+  inline void resize(Index newSize) { indices().resize(newSize); }
+
+  /** Sets *this to be the identity permutation matrix */
+  void setIdentity() {
+    StorageIndex n = StorageIndex(size());
+    for (StorageIndex i = 0; i < n; ++i) indices().coeffRef(i) = i;
+  }
+
+  /** Sets *this to be the identity permutation matrix of given size.
+   */
+  void setIdentity(Index newSize) {
+    resize(newSize);
+    setIdentity();
+  }
+
+  /** Multiplies *this by the transposition \f$(ij)\f$ on the left.
+   *
+   * \returns a reference to *this.
+   *
+   * \warning This is much slower than applyTranspositionOnTheRight(Index,Index):
+   * this has linear complexity and requires a lot of branching.
+   *
+   * \sa applyTranspositionOnTheRight(Index,Index)
+   */
+  Derived& applyTranspositionOnTheLeft(Index i, Index j) {
+    eigen_assert(i >= 0 && j >= 0 && i < size() && j < size());
+    for (Index k = 0; k < size(); ++k) {
+      if (indices().coeff(k) == i)
+        indices().coeffRef(k) = StorageIndex(j);
+      else if (indices().coeff(k) == j)
+        indices().coeffRef(k) = StorageIndex(i);
+    }
+    return derived();
+  }
+
+  /** Multiplies *this by the transposition \f$(ij)\f$ on the right.
+   *
+   * \returns a reference to *this.
+   *
+   * This is a fast operation, it only consists in swapping two indices.
+   *
+   * \sa applyTranspositionOnTheLeft(Index,Index)
+   */
+  Derived& applyTranspositionOnTheRight(Index i, Index j) {
+    eigen_assert(i >= 0 && j >= 0 && i < size() && j < size());
+    std::swap(indices().coeffRef(i), indices().coeffRef(j));
+    return derived();
+  }
+
+  /** \returns the inverse permutation matrix.
+   *
+   * \note \blank \note_try_to_help_rvo
+   */
+  inline InverseReturnType inverse() const { return InverseReturnType(derived()); }
+  /** \returns the transpose permutation matrix.
+   *
+   * \note \blank \note_try_to_help_rvo
+   */
+  inline InverseReturnType transpose() const { return InverseReturnType(derived()); }
+
+  /**** multiplication helpers to hopefully get RVO ****/
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+ protected:
+  template <typename OtherDerived>
+  void assignTranspose(const PermutationBase<OtherDerived>& other) {
+    for (Index i = 0; i < rows(); ++i) indices().coeffRef(other.indices().coeff(i)) = i;
+  }
+  template <typename Lhs, typename Rhs>
+  void assignProduct(const Lhs& lhs, const Rhs& rhs) {
+    eigen_assert(lhs.cols() == rhs.rows());
+    for (Index i = 0; i < rows(); ++i) indices().coeffRef(i) = lhs.indices().coeff(rhs.indices().coeff(i));
+  }
+#endif
+
+ public:
+  /** \returns the product permutation matrix.
+   *
+   * \note \blank \note_try_to_help_rvo
+   */
+  template <typename Other>
+  inline PlainPermutationType operator*(const PermutationBase<Other>& other) const {
+    return PlainPermutationType(internal::PermPermProduct, derived(), other.derived());
+  }
+
+  /** \returns the product of a permutation with another inverse permutation.
+   *
+   * \note \blank \note_try_to_help_rvo
+   */
+  template <typename Other>
+  inline PlainPermutationType operator*(const InverseImpl<Other, PermutationStorage>& other) const {
+    return PlainPermutationType(internal::PermPermProduct, *this, other.eval());
+  }
+
+  /** \returns the product of an inverse permutation with another permutation.
+   *
+   * \note \blank \note_try_to_help_rvo
+   */
+  template <typename Other>
+  friend inline PlainPermutationType operator*(const InverseImpl<Other, PermutationStorage>& other,
+                                               const PermutationBase& perm) {
+    return PlainPermutationType(internal::PermPermProduct, other.eval(), perm);
+  }
+
+  /** \returns the determinant of the permutation matrix, which is either 1 or -1 depending on the parity of the
+   * permutation.
+   *
+   * This function is O(\c n) procedure allocating a buffer of \c n booleans.
+   */
+  Index determinant() const {
+    Index res = 1;
+    Index n = size();
+    Matrix<bool, RowsAtCompileTime, 1, 0, MaxRowsAtCompileTime> mask(n);
+    mask.fill(false);
+    Index r = 0;
+    while (r < n) {
+      // search for the next seed
+      while (r < n && mask[r]) r++;
+      if (r >= n) break;
+      // we got one, let's follow it until we are back to the seed
+      Index k0 = r++;
+      mask.coeffRef(k0) = true;
+      for (Index k = indices().coeff(k0); k != k0; k = indices().coeff(k)) {
+        mask.coeffRef(k) = true;
+        res = -res;
+      }
+    }
+    return res;
+  }
+
+ protected:
+};
+
+namespace internal {
+template <int SizeAtCompileTime, int MaxSizeAtCompileTime, typename StorageIndex_>
+struct traits<PermutationMatrix<SizeAtCompileTime, MaxSizeAtCompileTime, StorageIndex_> >
+    : traits<
+          Matrix<StorageIndex_, SizeAtCompileTime, SizeAtCompileTime, 0, MaxSizeAtCompileTime, MaxSizeAtCompileTime> > {
+  typedef PermutationStorage StorageKind;
+  typedef Matrix<StorageIndex_, SizeAtCompileTime, 1, 0, MaxSizeAtCompileTime, 1> IndicesType;
+  typedef StorageIndex_ StorageIndex;
+  typedef void Scalar;
+};
+}  // namespace internal
+
+/** \class PermutationMatrix
+ * \ingroup Core_Module
+ *
+ * \brief Permutation matrix
+ *
+ * \tparam SizeAtCompileTime the number of rows/cols, or Dynamic
+ * \tparam MaxSizeAtCompileTime the maximum number of rows/cols, or Dynamic. This optional parameter defaults to
+ * SizeAtCompileTime. Most of the time, you should not have to specify it. \tparam StorageIndex_ the integer type of the
+ * indices
+ *
+ * This class represents a permutation matrix, internally stored as a vector of integers.
+ *
+ * \sa class PermutationBase, class PermutationWrapper, class DiagonalMatrix
+ */
+template <int SizeAtCompileTime, int MaxSizeAtCompileTime, typename StorageIndex_>
+class PermutationMatrix
+    : public PermutationBase<PermutationMatrix<SizeAtCompileTime, MaxSizeAtCompileTime, StorageIndex_> > {
+  typedef PermutationBase<PermutationMatrix> Base;
+  typedef internal::traits<PermutationMatrix> Traits;
+
+ public:
+  typedef const PermutationMatrix& Nested;
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  typedef typename Traits::IndicesType IndicesType;
+  typedef typename Traits::StorageIndex StorageIndex;
+#endif
+
+  inline PermutationMatrix() {}
+
+  /** Constructs an uninitialized permutation matrix of given size.
+   */
+  explicit inline PermutationMatrix(Index size) : m_indices(size) {
+    eigen_internal_assert(size <= NumTraits<StorageIndex>::highest());
+  }
+
+  /** Copy constructor. */
+  template <typename OtherDerived>
+  inline PermutationMatrix(const PermutationBase<OtherDerived>& other) : m_indices(other.indices()) {}
+
+  /** Generic constructor from expression of the indices. The indices
+   * array has the meaning that the permutations sends each integer i to indices[i].
+   *
+   * \warning It is your responsibility to check that the indices array that you passes actually
+   * describes a permutation, i.e., each value between 0 and n-1 occurs exactly once, where n is the
+   * array's size.
+   */
+  template <typename Other>
+  explicit inline PermutationMatrix(const MatrixBase<Other>& indices) : m_indices(indices) {}
+
+  /** Convert the Transpositions \a tr to a permutation matrix */
+  template <typename Other>
+  explicit PermutationMatrix(const TranspositionsBase<Other>& tr) : m_indices(tr.size()) {
+    *this = tr;
+  }
+
+  /** Copies the other permutation into *this */
+  template <typename Other>
+  PermutationMatrix& operator=(const PermutationBase<Other>& other) {
+    m_indices = other.indices();
+    return *this;
+  }
+
+  /** Assignment from the Transpositions \a tr */
+  template <typename Other>
+  PermutationMatrix& operator=(const TranspositionsBase<Other>& tr) {
+    return Base::operator=(tr.derived());
+  }
+
+  /** const version of indices(). */
+  const IndicesType& indices() const { return m_indices; }
+  /** \returns a reference to the stored array representing the permutation. */
+  IndicesType& indices() { return m_indices; }
+
+  /**** multiplication helpers to hopefully get RVO ****/
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  template <typename Other>
+  PermutationMatrix(const InverseImpl<Other, PermutationStorage>& other)
+      : m_indices(other.derived().nestedExpression().size()) {
+    eigen_internal_assert(m_indices.size() <= NumTraits<StorageIndex>::highest());
+    StorageIndex end = StorageIndex(m_indices.size());
+    for (StorageIndex i = 0; i < end; ++i)
+      m_indices.coeffRef(other.derived().nestedExpression().indices().coeff(i)) = i;
+  }
+  template <typename Lhs, typename Rhs>
+  PermutationMatrix(internal::PermPermProduct_t, const Lhs& lhs, const Rhs& rhs) : m_indices(lhs.indices().size()) {
+    Base::assignProduct(lhs, rhs);
+  }
+#endif
+
+ protected:
+  IndicesType m_indices;
+};
+
+namespace internal {
+template <int SizeAtCompileTime, int MaxSizeAtCompileTime, typename StorageIndex_, int PacketAccess_>
+struct traits<Map<PermutationMatrix<SizeAtCompileTime, MaxSizeAtCompileTime, StorageIndex_>, PacketAccess_> >
+    : traits<
+          Matrix<StorageIndex_, SizeAtCompileTime, SizeAtCompileTime, 0, MaxSizeAtCompileTime, MaxSizeAtCompileTime> > {
+  typedef PermutationStorage StorageKind;
+  typedef Map<const Matrix<StorageIndex_, SizeAtCompileTime, 1, 0, MaxSizeAtCompileTime, 1>, PacketAccess_> IndicesType;
+  typedef StorageIndex_ StorageIndex;
+  typedef void Scalar;
+};
+}  // namespace internal
+
+template <int SizeAtCompileTime, int MaxSizeAtCompileTime, typename StorageIndex_, int PacketAccess_>
+class Map<PermutationMatrix<SizeAtCompileTime, MaxSizeAtCompileTime, StorageIndex_>, PacketAccess_>
+    : public PermutationBase<
+          Map<PermutationMatrix<SizeAtCompileTime, MaxSizeAtCompileTime, StorageIndex_>, PacketAccess_> > {
+  typedef PermutationBase<Map> Base;
+  typedef internal::traits<Map> Traits;
+
+ public:
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  typedef typename Traits::IndicesType IndicesType;
+  typedef typename IndicesType::Scalar StorageIndex;
+#endif
+
+  inline Map(const StorageIndex* indicesPtr) : m_indices(indicesPtr) {}
+
+  inline Map(const StorageIndex* indicesPtr, Index size) : m_indices(indicesPtr, size) {}
+
+  /** Copies the other permutation into *this */
+  template <typename Other>
+  Map& operator=(const PermutationBase<Other>& other) {
+    return Base::operator=(other.derived());
+  }
+
+  /** Assignment from the Transpositions \a tr */
+  template <typename Other>
+  Map& operator=(const TranspositionsBase<Other>& tr) {
+    return Base::operator=(tr.derived());
+  }
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  /** This is a special case of the templated operator=. Its purpose is to
+   * prevent a default operator= from hiding the templated operator=.
+   */
+  Map& operator=(const Map& other) {
+    m_indices = other.m_indices;
+    return *this;
+  }
+#endif
+
+  /** const version of indices(). */
+  const IndicesType& indices() const { return m_indices; }
+  /** \returns a reference to the stored array representing the permutation. */
+  IndicesType& indices() { return m_indices; }
+
+ protected:
+  IndicesType m_indices;
+};
+
+template <typename IndicesType_>
+class TranspositionsWrapper;
+namespace internal {
+template <typename IndicesType_>
+struct traits<PermutationWrapper<IndicesType_> > {
+  typedef PermutationStorage StorageKind;
+  typedef void Scalar;
+  typedef typename IndicesType_::Scalar StorageIndex;
+  typedef IndicesType_ IndicesType;
+  enum {
+    RowsAtCompileTime = IndicesType_::SizeAtCompileTime,
+    ColsAtCompileTime = IndicesType_::SizeAtCompileTime,
+    MaxRowsAtCompileTime = IndicesType::MaxSizeAtCompileTime,
+    MaxColsAtCompileTime = IndicesType::MaxSizeAtCompileTime,
+    Flags = 0
+  };
+};
+}  // namespace internal
+
+/** \class PermutationWrapper
+ * \ingroup Core_Module
+ *
+ * \brief Class to view a vector of integers as a permutation matrix
+ *
+ * \tparam IndicesType_ the type of the vector of integer (can be any compatible expression)
+ *
+ * This class allows to view any vector expression of integers as a permutation matrix.
+ *
+ * \sa class PermutationBase, class PermutationMatrix
+ */
+template <typename IndicesType_>
+class PermutationWrapper : public PermutationBase<PermutationWrapper<IndicesType_> > {
+  typedef PermutationBase<PermutationWrapper> Base;
+  typedef internal::traits<PermutationWrapper> Traits;
+
+ public:
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  typedef typename Traits::IndicesType IndicesType;
+#endif
+
+  inline PermutationWrapper(const IndicesType& indices) : m_indices(indices) {}
+
+  /** const version of indices(). */
+  const internal::remove_all_t<typename IndicesType::Nested>& indices() const { return m_indices; }
+
+ protected:
+  typename IndicesType::Nested m_indices;
+};
+
+/** \returns the matrix with the permutation applied to the columns.
+ */
+template <typename MatrixDerived, typename PermutationDerived>
+EIGEN_DEVICE_FUNC const Product<MatrixDerived, PermutationDerived, AliasFreeProduct> operator*(
+    const MatrixBase<MatrixDerived>& matrix, const PermutationBase<PermutationDerived>& permutation) {
+  return Product<MatrixDerived, PermutationDerived, AliasFreeProduct>(matrix.derived(), permutation.derived());
+}
+
+/** \returns the matrix with the permutation applied to the rows.
+ */
+template <typename PermutationDerived, typename MatrixDerived>
+EIGEN_DEVICE_FUNC const Product<PermutationDerived, MatrixDerived, AliasFreeProduct> operator*(
+    const PermutationBase<PermutationDerived>& permutation, const MatrixBase<MatrixDerived>& matrix) {
+  return Product<PermutationDerived, MatrixDerived, AliasFreeProduct>(permutation.derived(), matrix.derived());
+}
+
+template <typename PermutationType>
+class InverseImpl<PermutationType, PermutationStorage> : public EigenBase<Inverse<PermutationType> > {
+  typedef typename PermutationType::PlainPermutationType PlainPermutationType;
+  typedef internal::traits<PermutationType> PermTraits;
+
+ protected:
+  InverseImpl() {}
+
+ public:
+  typedef Inverse<PermutationType> InverseType;
+  using EigenBase<Inverse<PermutationType> >::derived;
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  typedef typename PermutationType::DenseMatrixType DenseMatrixType;
+  enum {
+    RowsAtCompileTime = PermTraits::RowsAtCompileTime,
+    ColsAtCompileTime = PermTraits::ColsAtCompileTime,
+    MaxRowsAtCompileTime = PermTraits::MaxRowsAtCompileTime,
+    MaxColsAtCompileTime = PermTraits::MaxColsAtCompileTime
+  };
+#endif
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  template <typename DenseDerived>
+  void evalTo(MatrixBase<DenseDerived>& other) const {
+    other.setZero();
+    for (Index i = 0; i < derived().rows(); ++i)
+      other.coeffRef(i, derived().nestedExpression().indices().coeff(i)) = typename DenseDerived::Scalar(1);
+  }
+#endif
+
+  /** \return the equivalent permutation matrix */
+  PlainPermutationType eval() const { return derived(); }
+
+  DenseMatrixType toDenseMatrix() const { return derived(); }
+
+  /** \returns the matrix with the inverse permutation applied to the columns.
+   */
+  template <typename OtherDerived>
+  friend const Product<OtherDerived, InverseType, AliasFreeProduct> operator*(const MatrixBase<OtherDerived>& matrix,
+                                                                              const InverseType& trPerm) {
+    return Product<OtherDerived, InverseType, AliasFreeProduct>(matrix.derived(), trPerm.derived());
+  }
+
+  /** \returns the matrix with the inverse permutation applied to the rows.
+   */
+  template <typename OtherDerived>
+  const Product<InverseType, OtherDerived, AliasFreeProduct> operator*(const MatrixBase<OtherDerived>& matrix) const {
+    return Product<InverseType, OtherDerived, AliasFreeProduct>(derived(), matrix.derived());
+  }
+};
+
+template <typename Derived>
+const PermutationWrapper<const Derived> MatrixBase<Derived>::asPermutation() const {
+  return derived();
+}
+
+namespace internal {
+
+template <>
+struct AssignmentKind<DenseShape, PermutationShape> {
+  typedef EigenBase2EigenBase Kind;
+};
+
+}  // end namespace internal
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_PERMUTATIONMATRIX_H

eigen-master/Eigen/src/Core/PlainObjectBase.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008-2009 Gael Guennebaud <gael.guennebaud@inria.fr>
+// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_DENSESTORAGEBASE_H
+#define EIGEN_DENSESTORAGEBASE_H
+
+#if defined(EIGEN_INITIALIZE_MATRICES_BY_ZERO)
+#define EIGEN_INITIALIZE_COEFFS
+#define EIGEN_INITIALIZE_COEFFS_IF_THAT_OPTION_IS_ENABLED \
+  for (Index i = 0; i < base().size(); ++i) coeffRef(i) = Scalar(0);
+#elif defined(EIGEN_INITIALIZE_MATRICES_BY_NAN)
+#define EIGEN_INITIALIZE_COEFFS
+#define EIGEN_INITIALIZE_COEFFS_IF_THAT_OPTION_IS_ENABLED \
+  for (Index i = 0; i < base().size(); ++i) coeffRef(i) = std::numeric_limits<Scalar>::quiet_NaN();
+#else
+#undef EIGEN_INITIALIZE_COEFFS
+#define EIGEN_INITIALIZE_COEFFS_IF_THAT_OPTION_IS_ENABLED
+#endif
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+#ifndef EIGEN_NO_DEBUG
+template <int MaxSizeAtCompileTime, int MaxRowsAtCompileTime, int MaxColsAtCompileTime>
+struct check_rows_cols_for_overflow {
+  EIGEN_STATIC_ASSERT(MaxRowsAtCompileTime* MaxColsAtCompileTime == MaxSizeAtCompileTime,
+                      YOU MADE A PROGRAMMING MISTAKE)
+  template <typename Index>
+  EIGEN_DEVICE_FUNC static EIGEN_ALWAYS_INLINE constexpr void run(Index, Index) {}
+};
+
+template <int MaxRowsAtCompileTime>
+struct check_rows_cols_for_overflow<Dynamic, MaxRowsAtCompileTime, Dynamic> {
+  template <typename Index>
+  EIGEN_DEVICE_FUNC static EIGEN_ALWAYS_INLINE constexpr void run(Index, Index cols) {
+    constexpr Index MaxIndex = NumTraits<Index>::highest();
+    bool error = cols > (MaxIndex / MaxRowsAtCompileTime);
+    if (error) throw_std_bad_alloc();
+  }
+};
+
+template <int MaxColsAtCompileTime>
+struct check_rows_cols_for_overflow<Dynamic, Dynamic, MaxColsAtCompileTime> {
+  template <typename Index>
+  EIGEN_DEVICE_FUNC static EIGEN_ALWAYS_INLINE constexpr void run(Index rows, Index) {
+    constexpr Index MaxIndex = NumTraits<Index>::highest();
+    bool error = rows > (MaxIndex / MaxColsAtCompileTime);
+    if (error) throw_std_bad_alloc();
+  }
+};
+
+template <>
+struct check_rows_cols_for_overflow<Dynamic, Dynamic, Dynamic> {
+  template <typename Index>
+  EIGEN_DEVICE_FUNC static EIGEN_ALWAYS_INLINE constexpr void run(Index rows, Index cols) {
+    constexpr Index MaxIndex = NumTraits<Index>::highest();
+    bool error = cols == 0 ? false : (rows > (MaxIndex / cols));
+    if (error) throw_std_bad_alloc();
+  }
+};
+#endif
+
+template <typename Derived, typename OtherDerived = Derived,
+          bool IsVector = bool(Derived::IsVectorAtCompileTime) && bool(OtherDerived::IsVectorAtCompileTime)>
+struct conservative_resize_like_impl;
+
+template <typename MatrixTypeA, typename MatrixTypeB, bool SwapPointers>
+struct matrix_swap_impl;
+
+}  // end namespace internal
+
+/** \class PlainObjectBase
+ * \ingroup Core_Module
+ * \brief %Dense storage base class for matrices and arrays.
+ *
+ * This class can be extended with the help of the plugin mechanism described on the page
+ * \ref TopicCustomizing_Plugins by defining the preprocessor symbol \c EIGEN_PLAINOBJECTBASE_PLUGIN.
+ *
+ * \tparam Derived is the derived type, e.g., a Matrix or Array
+ *
+ * \sa \ref TopicClassHierarchy
+ */
+template <typename Derived>
+class PlainObjectBase : public internal::dense_xpr_base<Derived>::type {
+ public:
+  enum { Options = internal::traits<Derived>::Options };
+  typedef typename internal::dense_xpr_base<Derived>::type Base;
+
+  typedef typename internal::traits<Derived>::StorageKind StorageKind;
+  typedef typename internal::traits<Derived>::Scalar Scalar;
+
+  typedef typename internal::packet_traits<Scalar>::type PacketScalar;
+  typedef typename NumTraits<Scalar>::Real RealScalar;
+  typedef Derived DenseType;
+
+  using Base::ColsAtCompileTime;
+  using Base::Flags;
+  using Base::IsVectorAtCompileTime;
+  using Base::MaxColsAtCompileTime;
+  using Base::MaxRowsAtCompileTime;
+  using Base::MaxSizeAtCompileTime;
+  using Base::RowsAtCompileTime;
+  using Base::SizeAtCompileTime;
+
+  typedef Eigen::Map<Derived, Unaligned> MapType;
+  typedef const Eigen::Map<const Derived, Unaligned> ConstMapType;
+  typedef Eigen::Map<Derived, AlignedMax> AlignedMapType;
+  typedef const Eigen::Map<const Derived, AlignedMax> ConstAlignedMapType;
+  template <typename StrideType>
+  struct StridedMapType {
+    typedef Eigen::Map<Derived, Unaligned, StrideType> type;
+  };
+  template <typename StrideType>
+  struct StridedConstMapType {
+    typedef Eigen::Map<const Derived, Unaligned, StrideType> type;
+  };
+  template <typename StrideType>
+  struct StridedAlignedMapType {
+    typedef Eigen::Map<Derived, AlignedMax, StrideType> type;
+  };
+  template <typename StrideType>
+  struct StridedConstAlignedMapType {
+    typedef Eigen::Map<const Derived, AlignedMax, StrideType> type;
+  };
+
+ protected:
+  DenseStorage<Scalar, Base::MaxSizeAtCompileTime, Base::RowsAtCompileTime, Base::ColsAtCompileTime, Options> m_storage;
+
+ public:
+  enum { NeedsToAlign = (SizeAtCompileTime != Dynamic) && (internal::traits<Derived>::Alignment > 0) };
+  EIGEN_MAKE_ALIGNED_OPERATOR_NEW_IF(NeedsToAlign)
+
+  EIGEN_STATIC_ASSERT(internal::check_implication(MaxRowsAtCompileTime == 1 && MaxColsAtCompileTime != 1,
+                                                  (int(Options) & RowMajor) == RowMajor),
+                      INVALID_MATRIX_TEMPLATE_PARAMETERS)
+  EIGEN_STATIC_ASSERT(internal::check_implication(MaxColsAtCompileTime == 1 && MaxRowsAtCompileTime != 1,
+                                                  (int(Options) & RowMajor) == 0),
+                      INVALID_MATRIX_TEMPLATE_PARAMETERS)
+  EIGEN_STATIC_ASSERT((RowsAtCompileTime == Dynamic) || (RowsAtCompileTime >= 0), INVALID_MATRIX_TEMPLATE_PARAMETERS)
+  EIGEN_STATIC_ASSERT((ColsAtCompileTime == Dynamic) || (ColsAtCompileTime >= 0), INVALID_MATRIX_TEMPLATE_PARAMETERS)
+  EIGEN_STATIC_ASSERT((MaxRowsAtCompileTime == Dynamic) || (MaxRowsAtCompileTime >= 0),
+                      INVALID_MATRIX_TEMPLATE_PARAMETERS)
+  EIGEN_STATIC_ASSERT((MaxColsAtCompileTime == Dynamic) || (MaxColsAtCompileTime >= 0),
+                      INVALID_MATRIX_TEMPLATE_PARAMETERS)
+  EIGEN_STATIC_ASSERT((MaxRowsAtCompileTime == RowsAtCompileTime || RowsAtCompileTime == Dynamic),
+                      INVALID_MATRIX_TEMPLATE_PARAMETERS)
+  EIGEN_STATIC_ASSERT((MaxColsAtCompileTime == ColsAtCompileTime || ColsAtCompileTime == Dynamic),
+                      INVALID_MATRIX_TEMPLATE_PARAMETERS)
+  EIGEN_STATIC_ASSERT(((Options & (DontAlign | RowMajor)) == Options), INVALID_MATRIX_TEMPLATE_PARAMETERS)
+
+  EIGEN_DEVICE_FUNC Base& base() { return *static_cast<Base*>(this); }
+  EIGEN_DEVICE_FUNC const Base& base() const { return *static_cast<const Base*>(this); }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Index rows() const noexcept { return m_storage.rows(); }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Index cols() const noexcept { return m_storage.cols(); }
+
+  /** This is an overloaded version of DenseCoeffsBase<Derived,ReadOnlyAccessors>::coeff(Index,Index) const
+   * provided to by-pass the creation of an evaluator of the expression, thus saving compilation efforts.
+   *
+   * See DenseCoeffsBase<Derived,ReadOnlyAccessors>::coeff(Index) const for details. */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr const Scalar& coeff(Index rowId, Index colId) const {
+    if (Flags & RowMajorBit)
+      return m_storage.data()[colId + rowId * m_storage.cols()];
+    else  // column-major
+      return m_storage.data()[rowId + colId * m_storage.rows()];
+  }
+
+  /** This is an overloaded version of DenseCoeffsBase<Derived,ReadOnlyAccessors>::coeff(Index) const
+   * provided to by-pass the creation of an evaluator of the expression, thus saving compilation efforts.
+   *
+   * See DenseCoeffsBase<Derived,ReadOnlyAccessors>::coeff(Index) const for details. */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr const Scalar& coeff(Index index) const {
+    return m_storage.data()[index];
+  }
+
+  /** This is an overloaded version of DenseCoeffsBase<Derived,WriteAccessors>::coeffRef(Index,Index) const
+   * provided to by-pass the creation of an evaluator of the expression, thus saving compilation efforts.
+   *
+   * See DenseCoeffsBase<Derived,WriteAccessors>::coeffRef(Index,Index) const for details. */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Scalar& coeffRef(Index rowId, Index colId) {
+    if (Flags & RowMajorBit)
+      return m_storage.data()[colId + rowId * m_storage.cols()];
+    else  // column-major
+      return m_storage.data()[rowId + colId * m_storage.rows()];
+  }
+
+  /** This is an overloaded version of DenseCoeffsBase<Derived,WriteAccessors>::coeffRef(Index) const
+   * provided to by-pass the creation of an evaluator of the expression, thus saving compilation efforts.
+   *
+   * See DenseCoeffsBase<Derived,WriteAccessors>::coeffRef(Index) const for details. */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Scalar& coeffRef(Index index) { return m_storage.data()[index]; }
+
+  /** This is the const version of coeffRef(Index,Index) which is thus synonym of coeff(Index,Index).
+   * It is provided for convenience. */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr const Scalar& coeffRef(Index rowId, Index colId) const {
+    if (Flags & RowMajorBit)
+      return m_storage.data()[colId + rowId * m_storage.cols()];
+    else  // column-major
+      return m_storage.data()[rowId + colId * m_storage.rows()];
+  }
+
+  /** This is the const version of coeffRef(Index) which is thus synonym of coeff(Index).
+   * It is provided for convenience. */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr const Scalar& coeffRef(Index index) const {
+    return m_storage.data()[index];
+  }
+
+  /** \internal */
+  template <int LoadMode>
+  EIGEN_STRONG_INLINE PacketScalar packet(Index rowId, Index colId) const {
+    return internal::ploadt<PacketScalar, LoadMode>(
+        m_storage.data() + (Flags & RowMajorBit ? colId + rowId * m_storage.cols() : rowId + colId * m_storage.rows()));
+  }
+
+  /** \internal */
+  template <int LoadMode>
+  EIGEN_STRONG_INLINE PacketScalar packet(Index index) const {
+    return internal::ploadt<PacketScalar, LoadMode>(m_storage.data() + index);
+  }
+
+  /** \internal */
+  template <int StoreMode>
+  EIGEN_STRONG_INLINE void writePacket(Index rowId, Index colId, const PacketScalar& val) {
+    internal::pstoret<Scalar, PacketScalar, StoreMode>(
+        m_storage.data() + (Flags & RowMajorBit ? colId + rowId * m_storage.cols() : rowId + colId * m_storage.rows()),
+        val);
+  }
+
+  /** \internal */
+  template <int StoreMode>
+  EIGEN_STRONG_INLINE void writePacket(Index index, const PacketScalar& val) {
+    internal::pstoret<Scalar, PacketScalar, StoreMode>(m_storage.data() + index, val);
+  }
+
+  /** \returns a const pointer to the data array of this matrix */
+  EIGEN_DEVICE_FUNC constexpr const Scalar* data() const { return m_storage.data(); }
+
+  /** \returns a pointer to the data array of this matrix */
+  EIGEN_DEVICE_FUNC constexpr Scalar* data() { return m_storage.data(); }
+
+  /** Resizes \c *this to a \a rows x \a cols matrix.
+   *
+   * This method is intended for dynamic-size matrices, although it is legal to call it on any
+   * matrix as long as fixed dimensions are left unchanged. If you only want to change the number
+   * of rows and/or of columns, you can use resize(NoChange_t, Index), resize(Index, NoChange_t).
+   *
+   * If the current number of coefficients of \c *this exactly matches the
+   * product \a rows * \a cols, then no memory allocation is performed and
+   * the current values are left unchanged. In all other cases, including
+   * shrinking, the data is reallocated and all previous values are lost.
+   *
+   * Example: \include Matrix_resize_int_int.cpp
+   * Output: \verbinclude Matrix_resize_int_int.out
+   *
+   * \sa resize(Index) for vectors, resize(NoChange_t, Index), resize(Index, NoChange_t)
+   */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr void resize(Index rows, Index cols) {
+    eigen_assert(internal::check_implication(RowsAtCompileTime != Dynamic, rows == RowsAtCompileTime) &&
+                 internal::check_implication(ColsAtCompileTime != Dynamic, cols == ColsAtCompileTime) &&
+                 internal::check_implication(RowsAtCompileTime == Dynamic && MaxRowsAtCompileTime != Dynamic,
+                                             rows <= MaxRowsAtCompileTime) &&
+                 internal::check_implication(ColsAtCompileTime == Dynamic && MaxColsAtCompileTime != Dynamic,
+                                             cols <= MaxColsAtCompileTime) &&
+                 rows >= 0 && cols >= 0 && "Invalid sizes when resizing a matrix or array.");
+#ifndef EIGEN_NO_DEBUG
+    internal::check_rows_cols_for_overflow<MaxSizeAtCompileTime, MaxRowsAtCompileTime, MaxColsAtCompileTime>::run(rows,
+                                                                                                                  cols);
+#endif
+#ifdef EIGEN_INITIALIZE_COEFFS
+    Index size = rows * cols;
+    bool size_changed = size != this->size();
+    m_storage.resize(size, rows, cols);
+    if (size_changed) EIGEN_INITIALIZE_COEFFS_IF_THAT_OPTION_IS_ENABLED
+#else
+    m_storage.resize(rows * cols, rows, cols);
+#endif
+  }
+
+  /** Resizes \c *this to a vector of length \a size
+   *
+   * \only_for_vectors. This method does not work for
+   * partially dynamic matrices when the static dimension is anything other
+   * than 1. For example it will not work with Matrix<double, 2, Dynamic>.
+   *
+   * Example: \include Matrix_resize_int.cpp
+   * Output: \verbinclude Matrix_resize_int.out
+   *
+   * \sa resize(Index,Index), resize(NoChange_t, Index), resize(Index, NoChange_t)
+   */
+  EIGEN_DEVICE_FUNC constexpr void resize(Index size) {
+    EIGEN_STATIC_ASSERT_VECTOR_ONLY(PlainObjectBase)
+    eigen_assert(((SizeAtCompileTime == Dynamic && (MaxSizeAtCompileTime == Dynamic || size <= MaxSizeAtCompileTime)) ||
+                  SizeAtCompileTime == size) &&
+                 size >= 0);
+#ifdef EIGEN_INITIALIZE_COEFFS
+    bool size_changed = size != this->size();
+#endif
+    if (RowsAtCompileTime == 1)
+      m_storage.resize(size, 1, size);
+    else
+      m_storage.resize(size, size, 1);
+#ifdef EIGEN_INITIALIZE_COEFFS
+    if (size_changed) EIGEN_INITIALIZE_COEFFS_IF_THAT_OPTION_IS_ENABLED
+#endif
+  }
+
+  /** Resizes the matrix, changing only the number of columns. For the parameter of type NoChange_t, just pass the
+   * special value \c NoChange as in the example below.
+   *
+   * Example: \include Matrix_resize_NoChange_int.cpp
+   * Output: \verbinclude Matrix_resize_NoChange_int.out
+   *
+   * \sa resize(Index,Index)
+   */
+  EIGEN_DEVICE_FUNC constexpr void resize(NoChange_t, Index cols) { resize(rows(), cols); }
+
+  /** Resizes the matrix, changing only the number of rows. For the parameter of type NoChange_t, just pass the special
+   * value \c NoChange as in the example below.
+   *
+   * Example: \include Matrix_resize_int_NoChange.cpp
+   * Output: \verbinclude Matrix_resize_int_NoChange.out
+   *
+   * \sa resize(Index,Index)
+   */
+  EIGEN_DEVICE_FUNC constexpr void resize(Index rows, NoChange_t) { resize(rows, cols()); }
+
+  /** Resizes \c *this to have the same dimensions as \a other.
+   * Takes care of doing all the checking that's needed.
+   *
+   * Note that copying a row-vector into a vector (and conversely) is allowed.
+   * The resizing, if any, is then done in the appropriate way so that row-vectors
+   * remain row-vectors and vectors remain vectors.
+   */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void resizeLike(const EigenBase<OtherDerived>& _other) {
+    const OtherDerived& other = _other.derived();
+#ifndef EIGEN_NO_DEBUG
+    internal::check_rows_cols_for_overflow<MaxSizeAtCompileTime, MaxRowsAtCompileTime, MaxColsAtCompileTime>::run(
+        other.rows(), other.cols());
+#endif
+    const Index othersize = other.rows() * other.cols();
+    if (RowsAtCompileTime == 1) {
+      eigen_assert(other.rows() == 1 || other.cols() == 1);
+      resize(1, othersize);
+    } else if (ColsAtCompileTime == 1) {
+      eigen_assert(other.rows() == 1 || other.cols() == 1);
+      resize(othersize, 1);
+    } else
+      resize(other.rows(), other.cols());
+  }
+
+  /** Resizes the matrix to \a rows x \a cols while leaving old values untouched.
+   *
+   * The method is intended for matrices of dynamic size. If you only want to change the number
+   * of rows and/or of columns, you can use conservativeResize(NoChange_t, Index) or
+   * conservativeResize(Index, NoChange_t).
+   *
+   * Matrices are resized relative to the top-left element. In case values need to be
+   * appended to the matrix they will be uninitialized.
+   */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void conservativeResize(Index rows, Index cols) {
+    internal::conservative_resize_like_impl<Derived>::run(*this, rows, cols);
+  }
+
+  /** Resizes the matrix to \a rows x \a cols while leaving old values untouched.
+   *
+   * As opposed to conservativeResize(Index rows, Index cols), this version leaves
+   * the number of columns unchanged.
+   *
+   * In case the matrix is growing, new rows will be uninitialized.
+   */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void conservativeResize(Index rows, NoChange_t) {
+    // Note: see the comment in conservativeResize(Index,Index)
+    conservativeResize(rows, cols());
+  }
+
+  /** Resizes the matrix to \a rows x \a cols while leaving old values untouched.
+   *
+   * As opposed to conservativeResize(Index rows, Index cols), this version leaves
+   * the number of rows unchanged.
+   *
+   * In case the matrix is growing, new columns will be uninitialized.
+   */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void conservativeResize(NoChange_t, Index cols) {
+    // Note: see the comment in conservativeResize(Index,Index)
+    conservativeResize(rows(), cols);
+  }
+
+  /** Resizes the vector to \a size while retaining old values.
+   *
+   * \only_for_vectors. This method does not work for
+   * partially dynamic matrices when the static dimension is anything other
+   * than 1. For example it will not work with Matrix<double, 2, Dynamic>.
+   *
+   * When values are appended, they will be uninitialized.
+   */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void conservativeResize(Index size) {
+    internal::conservative_resize_like_impl<Derived>::run(*this, size);
+  }
+
+  /** Resizes the matrix to \a rows x \a cols of \c other, while leaving old values untouched.
+   *
+   * The method is intended for matrices of dynamic size. If you only want to change the number
+   * of rows and/or of columns, you can use conservativeResize(NoChange_t, Index) or
+   * conservativeResize(Index, NoChange_t).
+   *
+   * Matrices are resized relative to the top-left element. In case values need to be
+   * appended to the matrix they will copied from \c other.
+   */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void conservativeResizeLike(const DenseBase<OtherDerived>& other) {
+    internal::conservative_resize_like_impl<Derived, OtherDerived>::run(*this, other);
+  }
+
+  /** This is a special case of the templated operator=. Its purpose is to
+   * prevent a default operator= from hiding the templated operator=.
+   */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Derived& operator=(const PlainObjectBase& other) {
+    return _set(other);
+  }
+
+  /** \sa MatrixBase::lazyAssign() */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& lazyAssign(const DenseBase<OtherDerived>& other) {
+    _resize_to_match(other);
+    return Base::lazyAssign(other.derived());
+  }
+
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& operator=(const ReturnByValue<OtherDerived>& func) {
+    resize(func.rows(), func.cols());
+    return Base::operator=(func);
+  }
+
+  // Prevent user from trying to instantiate PlainObjectBase objects
+  // by making all its constructor protected. See bug 1074.
+ protected:
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr PlainObjectBase() = default;
+  /** \brief Move constructor */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr PlainObjectBase(PlainObjectBase&&) = default;
+  /** \brief Move assignment operator */
+  EIGEN_DEVICE_FUNC constexpr PlainObjectBase& operator=(PlainObjectBase&& other) noexcept {
+    m_storage = std::move(other.m_storage);
+    return *this;
+  }
+
+  /** Copy constructor */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr PlainObjectBase(const PlainObjectBase&) = default;
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PlainObjectBase(Index size, Index rows, Index cols)
+      : m_storage(size, rows, cols) {}
+
+  /** \brief Construct a row of column vector with fixed size from an arbitrary number of coefficients.
+   *
+   * \only_for_vectors
+   *
+   * This constructor is for 1D array or vectors with more than 4 coefficients.
+   *
+   * \warning To construct a column (resp. row) vector of fixed length, the number of values passed to this
+   * constructor must match the the fixed number of rows (resp. columns) of \c *this.
+   */
+  template <typename... ArgTypes>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PlainObjectBase(const Scalar& a0, const Scalar& a1, const Scalar& a2,
+                                                        const Scalar& a3, const ArgTypes&... args)
+      : m_storage() {
+    EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(PlainObjectBase, sizeof...(args) + 4);
+    m_storage.data()[0] = a0;
+    m_storage.data()[1] = a1;
+    m_storage.data()[2] = a2;
+    m_storage.data()[3] = a3;
+    Index i = 4;
+    auto x = {(m_storage.data()[i++] = args, 0)...};
+    static_cast<void>(x);
+  }
+
+  /** \brief Constructs a Matrix or Array and initializes it by elements given by an initializer list of initializer
+   * lists
+   */
+  EIGEN_DEVICE_FUNC explicit constexpr EIGEN_STRONG_INLINE PlainObjectBase(
+      const std::initializer_list<std::initializer_list<Scalar>>& list)
+      : m_storage() {
+    size_t list_size = 0;
+    if (list.begin() != list.end()) {
+      list_size = list.begin()->size();
+    }
+
+    // This is to allow syntax like VectorXi {{1, 2, 3, 4}}
+    if (ColsAtCompileTime == 1 && list.size() == 1) {
+      eigen_assert(list_size == static_cast<size_t>(RowsAtCompileTime) || RowsAtCompileTime == Dynamic);
+      resize(list_size, ColsAtCompileTime);
+      if (list.begin()->begin() != nullptr) {
+        Index index = 0;
+        for (const Scalar& e : *list.begin()) {
+          coeffRef(index++) = e;
+        }
+      }
+    } else {
+      eigen_assert(list.size() == static_cast<size_t>(RowsAtCompileTime) || RowsAtCompileTime == Dynamic);
+      eigen_assert(list_size == static_cast<size_t>(ColsAtCompileTime) || ColsAtCompileTime == Dynamic);
+      resize(list.size(), list_size);
+
+      Index row_index = 0;
+      for (const std::initializer_list<Scalar>& row : list) {
+        eigen_assert(list_size == row.size());
+        Index col_index = 0;
+        for (const Scalar& e : row) {
+          coeffRef(row_index, col_index) = e;
+          ++col_index;
+        }
+        ++row_index;
+      }
+    }
+  }
+
+  /** \sa PlainObjectBase::operator=(const EigenBase<OtherDerived>&) */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PlainObjectBase(const DenseBase<OtherDerived>& other) : m_storage() {
+    resizeLike(other);
+    _set_noalias(other);
+  }
+
+  /** \sa PlainObjectBase::operator=(const EigenBase<OtherDerived>&) */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PlainObjectBase(const EigenBase<OtherDerived>& other) : m_storage() {
+    resizeLike(other);
+    *this = other.derived();
+  }
+  /** \brief Copy constructor with in-place evaluation */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PlainObjectBase(const ReturnByValue<OtherDerived>& other) {
+    // FIXME this does not automatically transpose vectors if necessary
+    resize(other.rows(), other.cols());
+    other.evalTo(this->derived());
+  }
+
+ public:
+  /** \brief Copies the generic expression \a other into *this.
+   * \copydetails DenseBase::operator=(const EigenBase<OtherDerived> &other)
+   */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& operator=(const EigenBase<OtherDerived>& other) {
+    _resize_to_match(other);
+    Base::operator=(other.derived());
+    return this->derived();
+  }
+
+  /** \name Map
+   * These are convenience functions returning Map objects. The Map() static functions return unaligned Map objects,
+   * while the AlignedMap() functions return aligned Map objects and thus should be called only with 16-byte-aligned
+   * \a data pointers.
+   *
+   * Here is an example using strides:
+   * \include Matrix_Map_stride.cpp
+   * Output: \verbinclude Matrix_Map_stride.out
+   *
+   * \see class Map
+   */
+  ///@{
+  static inline ConstMapType Map(const Scalar* data) { return ConstMapType(data); }
+  static inline MapType Map(Scalar* data) { return MapType(data); }
+  static inline ConstMapType Map(const Scalar* data, Index size) { return ConstMapType(data, size); }
+  static inline MapType Map(Scalar* data, Index size) { return MapType(data, size); }
+  static inline ConstMapType Map(const Scalar* data, Index rows, Index cols) { return ConstMapType(data, rows, cols); }
+  static inline MapType Map(Scalar* data, Index rows, Index cols) { return MapType(data, rows, cols); }
+
+  static inline ConstAlignedMapType MapAligned(const Scalar* data) { return ConstAlignedMapType(data); }
+  static inline AlignedMapType MapAligned(Scalar* data) { return AlignedMapType(data); }
+  static inline ConstAlignedMapType MapAligned(const Scalar* data, Index size) {
+    return ConstAlignedMapType(data, size);
+  }
+  static inline AlignedMapType MapAligned(Scalar* data, Index size) { return AlignedMapType(data, size); }
+  static inline ConstAlignedMapType MapAligned(const Scalar* data, Index rows, Index cols) {
+    return ConstAlignedMapType(data, rows, cols);
+  }
+  static inline AlignedMapType MapAligned(Scalar* data, Index rows, Index cols) {
+    return AlignedMapType(data, rows, cols);
+  }
+
+  template <int Outer, int Inner>
+  static inline typename StridedConstMapType<Stride<Outer, Inner>>::type Map(const Scalar* data,
+                                                                             const Stride<Outer, Inner>& stride) {
+    return typename StridedConstMapType<Stride<Outer, Inner>>::type(data, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedMapType<Stride<Outer, Inner>>::type Map(Scalar* data,
+                                                                        const Stride<Outer, Inner>& stride) {
+    return typename StridedMapType<Stride<Outer, Inner>>::type(data, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedConstMapType<Stride<Outer, Inner>>::type Map(const Scalar* data, Index size,
+                                                                             const Stride<Outer, Inner>& stride) {
+    return typename StridedConstMapType<Stride<Outer, Inner>>::type(data, size, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedMapType<Stride<Outer, Inner>>::type Map(Scalar* data, Index size,
+                                                                        const Stride<Outer, Inner>& stride) {
+    return typename StridedMapType<Stride<Outer, Inner>>::type(data, size, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedConstMapType<Stride<Outer, Inner>>::type Map(const Scalar* data, Index rows, Index cols,
+                                                                             const Stride<Outer, Inner>& stride) {
+    return typename StridedConstMapType<Stride<Outer, Inner>>::type(data, rows, cols, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedMapType<Stride<Outer, Inner>>::type Map(Scalar* data, Index rows, Index cols,
+                                                                        const Stride<Outer, Inner>& stride) {
+    return typename StridedMapType<Stride<Outer, Inner>>::type(data, rows, cols, stride);
+  }
+
+  template <int Outer, int Inner>
+  static inline typename StridedConstAlignedMapType<Stride<Outer, Inner>>::type MapAligned(
+      const Scalar* data, const Stride<Outer, Inner>& stride) {
+    return typename StridedConstAlignedMapType<Stride<Outer, Inner>>::type(data, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedAlignedMapType<Stride<Outer, Inner>>::type MapAligned(
+      Scalar* data, const Stride<Outer, Inner>& stride) {
+    return typename StridedAlignedMapType<Stride<Outer, Inner>>::type(data, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedConstAlignedMapType<Stride<Outer, Inner>>::type MapAligned(
+      const Scalar* data, Index size, const Stride<Outer, Inner>& stride) {
+    return typename StridedConstAlignedMapType<Stride<Outer, Inner>>::type(data, size, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedAlignedMapType<Stride<Outer, Inner>>::type MapAligned(
+      Scalar* data, Index size, const Stride<Outer, Inner>& stride) {
+    return typename StridedAlignedMapType<Stride<Outer, Inner>>::type(data, size, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedConstAlignedMapType<Stride<Outer, Inner>>::type MapAligned(
+      const Scalar* data, Index rows, Index cols, const Stride<Outer, Inner>& stride) {
+    return typename StridedConstAlignedMapType<Stride<Outer, Inner>>::type(data, rows, cols, stride);
+  }
+  template <int Outer, int Inner>
+  static inline typename StridedAlignedMapType<Stride<Outer, Inner>>::type MapAligned(
+      Scalar* data, Index rows, Index cols, const Stride<Outer, Inner>& stride) {
+    return typename StridedAlignedMapType<Stride<Outer, Inner>>::type(data, rows, cols, stride);
+  }
+  ///@}
+
+  using Base::setConstant;
+  EIGEN_DEVICE_FUNC Derived& setConstant(Index size, const Scalar& val);
+  EIGEN_DEVICE_FUNC Derived& setConstant(Index rows, Index cols, const Scalar& val);
+  EIGEN_DEVICE_FUNC Derived& setConstant(NoChange_t, Index cols, const Scalar& val);
+  EIGEN_DEVICE_FUNC Derived& setConstant(Index rows, NoChange_t, const Scalar& val);
+
+  using Base::setZero;
+  EIGEN_DEVICE_FUNC Derived& setZero(Index size);
+  EIGEN_DEVICE_FUNC Derived& setZero(Index rows, Index cols);
+  EIGEN_DEVICE_FUNC Derived& setZero(NoChange_t, Index cols);
+  EIGEN_DEVICE_FUNC Derived& setZero(Index rows, NoChange_t);
+
+  using Base::setOnes;
+  EIGEN_DEVICE_FUNC Derived& setOnes(Index size);
+  EIGEN_DEVICE_FUNC Derived& setOnes(Index rows, Index cols);
+  EIGEN_DEVICE_FUNC Derived& setOnes(NoChange_t, Index cols);
+  EIGEN_DEVICE_FUNC Derived& setOnes(Index rows, NoChange_t);
+
+  using Base::setRandom;
+  Derived& setRandom(Index size);
+  Derived& setRandom(Index rows, Index cols);
+  Derived& setRandom(NoChange_t, Index cols);
+  Derived& setRandom(Index rows, NoChange_t);
+
+#ifdef EIGEN_PLAINOBJECTBASE_PLUGIN
+#include EIGEN_PLAINOBJECTBASE_PLUGIN
+#endif
+
+ protected:
+  /** \internal Resizes *this in preparation for assigning \a other to it.
+   * Takes care of doing all the checking that's needed.
+   *
+   * Note that copying a row-vector into a vector (and conversely) is allowed.
+   * The resizing, if any, is then done in the appropriate way so that row-vectors
+   * remain row-vectors and vectors remain vectors.
+   */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _resize_to_match(const EigenBase<OtherDerived>& other) {
+#ifdef EIGEN_NO_AUTOMATIC_RESIZING
+    eigen_assert((this->size() == 0 || (IsVectorAtCompileTime ? (this->size() == other.size())
+                                                              : (rows() == other.rows() && cols() == other.cols()))) &&
+                 "Size mismatch. Automatic resizing is disabled because EIGEN_NO_AUTOMATIC_RESIZING is defined");
+    EIGEN_ONLY_USED_FOR_DEBUG(other);
+#else
+    resizeLike(other);
+#endif
+  }
+
+  /**
+   * \brief Copies the value of the expression \a other into \c *this with automatic resizing.
+   *
+   * *this might be resized to match the dimensions of \a other. If *this was a null matrix (not already initialized),
+   * it will be initialized.
+   *
+   * Note that copying a row-vector into a vector (and conversely) is allowed.
+   * The resizing, if any, is then done in the appropriate way so that row-vectors
+   * remain row-vectors and vectors remain vectors.
+   *
+   * \sa operator=(const MatrixBase<OtherDerived>&), _set_noalias()
+   *
+   * \internal
+   */
+  // aliasing is dealt once in internal::call_assignment
+  // so at this stage we have to assume aliasing... and resising has to be done later.
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Derived& _set(const DenseBase<OtherDerived>& other) {
+    internal::call_assignment(this->derived(), other.derived());
+    return this->derived();
+  }
+
+  /** \internal Like _set() but additionally makes the assumption that no aliasing effect can happen (which
+   * is the case when creating a new matrix) so one can enforce lazy evaluation.
+   *
+   * \sa operator=(const MatrixBase<OtherDerived>&), _set()
+   */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Derived& _set_noalias(const DenseBase<OtherDerived>& other) {
+    // I don't think we need this resize call since the lazyAssign will anyways resize
+    // and lazyAssign will be called by the assign selector.
+    //_resize_to_match(other);
+    // the 'false' below means to enforce lazy evaluation. We don't use lazyAssign() because
+    // it wouldn't allow to copy a row-vector into a column-vector.
+    internal::call_assignment_no_alias(this->derived(), other.derived(),
+                                       internal::assign_op<Scalar, typename OtherDerived::Scalar>());
+    return this->derived();
+  }
+
+  template <typename T0, typename T1>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init2(Index rows, Index cols,
+                                                    std::enable_if_t<Base::SizeAtCompileTime != 2, T0>* = 0) {
+    EIGEN_STATIC_ASSERT(internal::is_valid_index_type<T0>::value && internal::is_valid_index_type<T1>::value,
+                        T0 AND T1 MUST BE INTEGER TYPES)
+    resize(rows, cols);
+  }
+
+  template <typename T0, typename T1>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init2(const T0& val0, const T1& val1,
+                                                    std::enable_if_t<Base::SizeAtCompileTime == 2, T0>* = 0) {
+    EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(PlainObjectBase, 2)
+    m_storage.data()[0] = Scalar(val0);
+    m_storage.data()[1] = Scalar(val1);
+  }
+
+  template <typename T0, typename T1>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init2(
+      const Index& val0, const Index& val1,
+      std::enable_if_t<(!internal::is_same<Index, Scalar>::value) && (internal::is_same<T0, Index>::value) &&
+                           (internal::is_same<T1, Index>::value) && Base::SizeAtCompileTime == 2,
+                       T1>* = 0) {
+    EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(PlainObjectBase, 2)
+    m_storage.data()[0] = Scalar(val0);
+    m_storage.data()[1] = Scalar(val1);
+  }
+
+  // The argument is convertible to the Index type and we either have a non 1x1 Matrix, or a dynamic-sized Array,
+  // then the argument is meant to be the size of the object.
+  template <typename T>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(
+      Index size,
+      std::enable_if_t<(Base::SizeAtCompileTime != 1 || !internal::is_convertible<T, Scalar>::value) &&
+                           ((!internal::is_same<typename internal::traits<Derived>::XprKind, ArrayXpr>::value ||
+                             Base::SizeAtCompileTime == Dynamic)),
+                       T>* = 0) {
+    // NOTE MSVC 2008 complains if we directly put bool(NumTraits<T>::IsInteger) as the EIGEN_STATIC_ASSERT argument.
+    const bool is_integer_alike = internal::is_valid_index_type<T>::value;
+    EIGEN_UNUSED_VARIABLE(is_integer_alike);
+    EIGEN_STATIC_ASSERT(is_integer_alike, FLOATING_POINT_ARGUMENT_PASSED__INTEGER_WAS_EXPECTED)
+    resize(size);
+  }
+
+  // We have a 1x1 matrix/array => the argument is interpreted as the value of the unique coefficient (case where scalar
+  // type can be implicitly converted)
+  template <typename T>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(
+      const Scalar& val0,
+      std::enable_if_t<Base::SizeAtCompileTime == 1 && internal::is_convertible<T, Scalar>::value, T>* = 0) {
+    EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(PlainObjectBase, 1)
+    m_storage.data()[0] = val0;
+  }
+
+  // We have a 1x1 matrix/array => the argument is interpreted as the value of the unique coefficient (case where scalar
+  // type match the index type)
+  template <typename T>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(
+      const Index& val0,
+      std::enable_if_t<(!internal::is_same<Index, Scalar>::value) && (internal::is_same<Index, T>::value) &&
+                           Base::SizeAtCompileTime == 1 && internal::is_convertible<T, Scalar>::value,
+                       T*>* = 0) {
+    EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(PlainObjectBase, 1)
+    m_storage.data()[0] = Scalar(val0);
+  }
+
+  // Initialize a fixed size matrix from a pointer to raw data
+  template <typename T>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(const Scalar* data) {
+    this->_set_noalias(ConstMapType(data));
+  }
+
+  // Initialize an arbitrary matrix from a dense expression
+  template <typename T, typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(const DenseBase<OtherDerived>& other) {
+    this->_set_noalias(other);
+  }
+
+  // Initialize an arbitrary matrix from an object convertible to the Derived type.
+  template <typename T>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(const Derived& other) {
+    this->_set_noalias(other);
+  }
+
+  // Initialize an arbitrary matrix from a generic Eigen expression
+  template <typename T, typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(const EigenBase<OtherDerived>& other) {
+    this->derived() = other;
+  }
+
+  template <typename T, typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(const ReturnByValue<OtherDerived>& other) {
+    resize(other.rows(), other.cols());
+    other.evalTo(this->derived());
+  }
+
+  template <typename T, typename OtherDerived, int ColsAtCompileTime>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(const RotationBase<OtherDerived, ColsAtCompileTime>& r) {
+    this->derived() = r;
+  }
+
+  // For fixed-size Array<Scalar,...>
+  template <typename T>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(
+      const Scalar& val0,
+      std::enable_if_t<Base::SizeAtCompileTime != Dynamic && Base::SizeAtCompileTime != 1 &&
+                           internal::is_convertible<T, Scalar>::value &&
+                           internal::is_same<typename internal::traits<Derived>::XprKind, ArrayXpr>::value,
+                       T>* = 0) {
+    Base::setConstant(val0);
+  }
+
+  // For fixed-size Array<Index,...>
+  template <typename T>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void _init1(
+      const Index& val0,
+      std::enable_if_t<(!internal::is_same<Index, Scalar>::value) && (internal::is_same<Index, T>::value) &&
+                           Base::SizeAtCompileTime != Dynamic && Base::SizeAtCompileTime != 1 &&
+                           internal::is_convertible<T, Scalar>::value &&
+                           internal::is_same<typename internal::traits<Derived>::XprKind, ArrayXpr>::value,
+                       T*>* = 0) {
+    Base::setConstant(val0);
+  }
+
+  template <typename MatrixTypeA, typename MatrixTypeB, bool SwapPointers>
+  friend struct internal::matrix_swap_impl;
+
+ public:
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  /** \internal
+   * \brief Override DenseBase::swap() since for dynamic-sized matrices
+   * of same type it is enough to swap the data pointers.
+   */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void swap(DenseBase<OtherDerived>& other) {
+    enum {SwapPointers = internal::is_same<Derived, OtherDerived>::value && Base::SizeAtCompileTime == Dynamic};
+    internal::matrix_swap_impl<Derived, OtherDerived, bool(SwapPointers)>::run(this->derived(), other.derived());
+  }
+
+  /** \internal
+   * \brief const version forwarded to DenseBase::swap
+   */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void swap(DenseBase<OtherDerived> const& other) {
+    Base::swap(other.derived());
+  }
+
+  enum {IsPlainObjectBase = 1};
+#endif
+ public:
+  // These apparently need to be down here for nvcc+icc to prevent duplicate
+  // Map symbol.
+  template <typename PlainObjectType, int MapOptions, typename StrideType>
+  friend class Eigen::Map;
+  friend class Eigen::Map<Derived, Unaligned>;
+  friend class Eigen::Map<const Derived, Unaligned>;
+#if EIGEN_MAX_ALIGN_BYTES > 0
+  // for EIGEN_MAX_ALIGN_BYTES==0, AlignedMax==Unaligned, and many compilers generate warnings for friend-ing a class
+  // twice.
+  friend class Eigen::Map<Derived, AlignedMax>;
+  friend class Eigen::Map<const Derived, AlignedMax>;
+#endif
+};
+
+namespace internal {
+
+template <typename Derived, typename OtherDerived, bool IsVector>
+struct conservative_resize_like_impl {
+  static constexpr bool IsRelocatable = std::is_trivially_copyable<typename Derived::Scalar>::value;
+  static void run(DenseBase<Derived>& _this, Index rows, Index cols) {
+    if (_this.rows() == rows && _this.cols() == cols) return;
+    EIGEN_STATIC_ASSERT_DYNAMIC_SIZE(Derived)
+
+    if (IsRelocatable &&
+        ((Derived::IsRowMajor && _this.cols() == cols) ||  // row-major and we change only the number of rows
+         (!Derived::IsRowMajor && _this.rows() == rows)))  // column-major and we change only the number of columns
+    {
+#ifndef EIGEN_NO_DEBUG
+      internal::check_rows_cols_for_overflow<Derived::MaxSizeAtCompileTime, Derived::MaxRowsAtCompileTime,
+                                             Derived::MaxColsAtCompileTime>::run(rows, cols);
+#endif
+      _this.derived().m_storage.conservativeResize(rows * cols, rows, cols);
+    } else {
+      // The storage order does not allow us to use reallocation.
+      Derived tmp(rows, cols);
+      const Index common_rows = numext::mini(rows, _this.rows());
+      const Index common_cols = numext::mini(cols, _this.cols());
+      tmp.block(0, 0, common_rows, common_cols) = _this.block(0, 0, common_rows, common_cols);
+      _this.derived().swap(tmp);
+    }
+  }
+
+  static void run(DenseBase<Derived>& _this, const DenseBase<OtherDerived>& other) {
+    if (_this.rows() == other.rows() && _this.cols() == other.cols()) return;
+
+    // Note: Here is space for improvement. Basically, for conservativeResize(Index,Index),
+    // neither RowsAtCompileTime or ColsAtCompileTime must be Dynamic. If only one of the
+    // dimensions is dynamic, one could use either conservativeResize(Index rows, NoChange_t) or
+    // conservativeResize(NoChange_t, Index cols). For these methods new static asserts like
+    // EIGEN_STATIC_ASSERT_DYNAMIC_ROWS and EIGEN_STATIC_ASSERT_DYNAMIC_COLS would be good.
+    EIGEN_STATIC_ASSERT_DYNAMIC_SIZE(Derived)
+    EIGEN_STATIC_ASSERT_DYNAMIC_SIZE(OtherDerived)
+
+    if (IsRelocatable &&
+        ((Derived::IsRowMajor && _this.cols() == other.cols()) ||  // row-major and we change only the number of rows
+         (!Derived::IsRowMajor &&
+          _this.rows() == other.rows())))  // column-major and we change only the number of columns
+    {
+      const Index new_rows = other.rows() - _this.rows();
+      const Index new_cols = other.cols() - _this.cols();
+      _this.derived().m_storage.conservativeResize(other.size(), other.rows(), other.cols());
+      if (new_rows > 0)
+        _this.bottomRightCorner(new_rows, other.cols()) = other.bottomRows(new_rows);
+      else if (new_cols > 0)
+        _this.bottomRightCorner(other.rows(), new_cols) = other.rightCols(new_cols);
+    } else {
+      // The storage order does not allow us to use reallocation.
+      Derived tmp(other);
+      const Index common_rows = numext::mini(tmp.rows(), _this.rows());
+      const Index common_cols = numext::mini(tmp.cols(), _this.cols());
+      tmp.block(0, 0, common_rows, common_cols) = _this.block(0, 0, common_rows, common_cols);
+      _this.derived().swap(tmp);
+    }
+  }
+};
+
+// Here, the specialization for vectors inherits from the general matrix case
+// to allow calling .conservativeResize(rows,cols) on vectors.
+template <typename Derived, typename OtherDerived>
+struct conservative_resize_like_impl<Derived, OtherDerived, true>
+    : conservative_resize_like_impl<Derived, OtherDerived, false> {
+  typedef conservative_resize_like_impl<Derived, OtherDerived, false> Base;
+  using Base::IsRelocatable;
+  using Base::run;
+
+  static void run(DenseBase<Derived>& _this, Index size) {
+    const Index new_rows = Derived::RowsAtCompileTime == 1 ? 1 : size;
+    const Index new_cols = Derived::RowsAtCompileTime == 1 ? size : 1;
+    if (IsRelocatable)
+      _this.derived().m_storage.conservativeResize(size, new_rows, new_cols);
+    else
+      Base::run(_this.derived(), new_rows, new_cols);
+  }
+
+  static void run(DenseBase<Derived>& _this, const DenseBase<OtherDerived>& other) {
+    if (_this.rows() == other.rows() && _this.cols() == other.cols()) return;
+
+    const Index num_new_elements = other.size() - _this.size();
+
+    const Index new_rows = Derived::RowsAtCompileTime == 1 ? 1 : other.rows();
+    const Index new_cols = Derived::RowsAtCompileTime == 1 ? other.cols() : 1;
+    if (IsRelocatable)
+      _this.derived().m_storage.conservativeResize(other.size(), new_rows, new_cols);
+    else
+      Base::run(_this.derived(), new_rows, new_cols);
+
+    if (num_new_elements > 0) _this.tail(num_new_elements) = other.tail(num_new_elements);
+  }
+};
+
+template <typename MatrixTypeA, typename MatrixTypeB, bool SwapPointers>
+struct matrix_swap_impl {
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE void run(MatrixTypeA& a, MatrixTypeB& b) { a.base().swap(b); }
+};
+
+template <typename MatrixTypeA, typename MatrixTypeB>
+struct matrix_swap_impl<MatrixTypeA, MatrixTypeB, true> {
+  EIGEN_DEVICE_FUNC static inline void run(MatrixTypeA& a, MatrixTypeB& b) {
+    static_cast<typename MatrixTypeA::Base&>(a).m_storage.swap(static_cast<typename MatrixTypeB::Base&>(b).m_storage);
+  }
+};
+
+}  // end namespace internal
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_DENSESTORAGEBASE_H

eigen-master/Eigen/src/Core/Product.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008-2011 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_PRODUCT_H
+#define EIGEN_PRODUCT_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+template <typename Lhs, typename Rhs, int Option, typename StorageKind>
+class ProductImpl;
+
+namespace internal {
+
+template <typename Lhs, typename Rhs, int Option>
+struct traits<Product<Lhs, Rhs, Option>> {
+  typedef remove_all_t<Lhs> LhsCleaned;
+  typedef remove_all_t<Rhs> RhsCleaned;
+  typedef traits<LhsCleaned> LhsTraits;
+  typedef traits<RhsCleaned> RhsTraits;
+
+  typedef MatrixXpr XprKind;
+
+  typedef typename ScalarBinaryOpTraits<typename traits<LhsCleaned>::Scalar,
+                                        typename traits<RhsCleaned>::Scalar>::ReturnType Scalar;
+  typedef typename product_promote_storage_type<typename LhsTraits::StorageKind, typename RhsTraits::StorageKind,
+                                                internal::product_type<Lhs, Rhs>::ret>::ret StorageKind;
+  typedef typename promote_index_type<typename LhsTraits::StorageIndex, typename RhsTraits::StorageIndex>::type
+      StorageIndex;
+
+  enum {
+    RowsAtCompileTime = LhsTraits::RowsAtCompileTime,
+    ColsAtCompileTime = RhsTraits::ColsAtCompileTime,
+    MaxRowsAtCompileTime = LhsTraits::MaxRowsAtCompileTime,
+    MaxColsAtCompileTime = RhsTraits::MaxColsAtCompileTime,
+
+    // FIXME: only needed by GeneralMatrixMatrixTriangular
+    InnerSize = min_size_prefer_fixed(LhsTraits::ColsAtCompileTime, RhsTraits::RowsAtCompileTime),
+
+    // The storage order is somewhat arbitrary here. The correct one will be determined through the evaluator.
+    Flags = (MaxRowsAtCompileTime == 1 && MaxColsAtCompileTime != 1)   ? RowMajorBit
+            : (MaxColsAtCompileTime == 1 && MaxRowsAtCompileTime != 1) ? 0
+            : (((LhsTraits::Flags & NoPreferredStorageOrderBit) && (RhsTraits::Flags & RowMajorBit)) ||
+               ((RhsTraits::Flags & NoPreferredStorageOrderBit) && (LhsTraits::Flags & RowMajorBit)))
+                ? RowMajorBit
+                : NoPreferredStorageOrderBit
+  };
+};
+
+struct TransposeProductEnum {
+  // convenience enumerations to specialize transposed products
+  enum : int {
+    Default = 0x00,
+    Matrix = 0x01,
+    Permutation = 0x02,
+    MatrixMatrix = (Matrix << 8) | Matrix,
+    MatrixPermutation = (Matrix << 8) | Permutation,
+    PermutationMatrix = (Permutation << 8) | Matrix
+  };
+};
+template <typename Xpr>
+struct TransposeKind {
+  static constexpr int Kind = is_matrix_base_xpr<Xpr>::value        ? TransposeProductEnum::Matrix
+                              : is_permutation_base_xpr<Xpr>::value ? TransposeProductEnum::Permutation
+                                                                    : TransposeProductEnum::Default;
+};
+
+template <typename Lhs, typename Rhs>
+struct TransposeProductKind {
+  static constexpr int Kind = (TransposeKind<Lhs>::Kind << 8) | TransposeKind<Rhs>::Kind;
+};
+
+template <typename Lhs, typename Rhs, int Option, int Kind = TransposeProductKind<Lhs, Rhs>::Kind>
+struct product_transpose_helper {
+  // by default, don't optimize the transposed product
+  using Derived = Product<Lhs, Rhs, Option>;
+  using Scalar = typename Derived::Scalar;
+  using TransposeType = Transpose<const Derived>;
+  using ConjugateTransposeType = CwiseUnaryOp<scalar_conjugate_op<Scalar>, TransposeType>;
+  using AdjointType = std::conditional_t<NumTraits<Scalar>::IsComplex, ConjugateTransposeType, TransposeType>;
+
+  // return (lhs * rhs)^T
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TransposeType run_transpose(const Derived& derived) {
+    return TransposeType(derived);
+  }
+  // return (lhs * rhs)^H
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE AdjointType run_adjoint(const Derived& derived) {
+    return AdjointType(TransposeType(derived));
+  }
+};
+
+template <typename Lhs, typename Rhs, int Option>
+struct product_transpose_helper<Lhs, Rhs, Option, TransposeProductEnum::MatrixMatrix> {
+  // expand the transposed matrix-matrix product
+  using Derived = Product<Lhs, Rhs, Option>;
+
+  using LhsScalar = typename traits<Lhs>::Scalar;
+  using LhsTransposeType = typename DenseBase<Lhs>::ConstTransposeReturnType;
+  using LhsConjugateTransposeType = CwiseUnaryOp<scalar_conjugate_op<LhsScalar>, LhsTransposeType>;
+  using LhsAdjointType =
+      std::conditional_t<NumTraits<LhsScalar>::IsComplex, LhsConjugateTransposeType, LhsTransposeType>;
+
+  using RhsScalar = typename traits<Rhs>::Scalar;
+  using RhsTransposeType = typename DenseBase<Rhs>::ConstTransposeReturnType;
+  using RhsConjugateTransposeType = CwiseUnaryOp<scalar_conjugate_op<RhsScalar>, RhsTransposeType>;
+  using RhsAdjointType =
+      std::conditional_t<NumTraits<RhsScalar>::IsComplex, RhsConjugateTransposeType, RhsTransposeType>;
+
+  using TransposeType = Product<RhsTransposeType, LhsTransposeType, Option>;
+  using AdjointType = Product<RhsAdjointType, LhsAdjointType, Option>;
+
+  // return rhs^T * lhs^T
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TransposeType run_transpose(const Derived& derived) {
+    return TransposeType(RhsTransposeType(derived.rhs()), LhsTransposeType(derived.lhs()));
+  }
+  // return rhs^H * lhs^H
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE AdjointType run_adjoint(const Derived& derived) {
+    return AdjointType(RhsAdjointType(RhsTransposeType(derived.rhs())),
+                       LhsAdjointType(LhsTransposeType(derived.lhs())));
+  }
+};
+template <typename Lhs, typename Rhs, int Option>
+struct product_transpose_helper<Lhs, Rhs, Option, TransposeProductEnum::PermutationMatrix> {
+  // expand the transposed permutation-matrix product
+  using Derived = Product<Lhs, Rhs, Option>;
+
+  using LhsInverseType = typename PermutationBase<Lhs>::InverseReturnType;
+
+  using RhsScalar = typename traits<Rhs>::Scalar;
+  using RhsTransposeType = typename DenseBase<Rhs>::ConstTransposeReturnType;
+  using RhsConjugateTransposeType = CwiseUnaryOp<scalar_conjugate_op<RhsScalar>, RhsTransposeType>;
+  using RhsAdjointType =
+      std::conditional_t<NumTraits<RhsScalar>::IsComplex, RhsConjugateTransposeType, RhsTransposeType>;
+
+  using TransposeType = Product<RhsTransposeType, LhsInverseType, Option>;
+  using AdjointType = Product<RhsAdjointType, LhsInverseType, Option>;
+
+  // return rhs^T * lhs^-1
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TransposeType run_transpose(const Derived& derived) {
+    return TransposeType(RhsTransposeType(derived.rhs()), LhsInverseType(derived.lhs()));
+  }
+  // return rhs^H * lhs^-1
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE AdjointType run_adjoint(const Derived& derived) {
+    return AdjointType(RhsAdjointType(RhsTransposeType(derived.rhs())), LhsInverseType(derived.lhs()));
+  }
+};
+template <typename Lhs, typename Rhs, int Option>
+struct product_transpose_helper<Lhs, Rhs, Option, TransposeProductEnum::MatrixPermutation> {
+  // expand the transposed matrix-permutation product
+  using Derived = Product<Lhs, Rhs, Option>;
+
+  using LhsScalar = typename traits<Lhs>::Scalar;
+  using LhsTransposeType = typename DenseBase<Lhs>::ConstTransposeReturnType;
+  using LhsConjugateTransposeType = CwiseUnaryOp<scalar_conjugate_op<LhsScalar>, LhsTransposeType>;
+  using LhsAdjointType =
+      std::conditional_t<NumTraits<LhsScalar>::IsComplex, LhsConjugateTransposeType, LhsTransposeType>;
+
+  using RhsInverseType = typename PermutationBase<Rhs>::InverseReturnType;
+
+  using TransposeType = Product<RhsInverseType, LhsTransposeType, Option>;
+  using AdjointType = Product<RhsInverseType, LhsAdjointType, Option>;
+
+  // return rhs^-1 * lhs^T
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TransposeType run_transpose(const Derived& derived) {
+    return TransposeType(RhsInverseType(derived.rhs()), LhsTransposeType(derived.lhs()));
+  }
+  // return rhs^-1 * lhs^H
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE AdjointType run_adjoint(const Derived& derived) {
+    return AdjointType(RhsInverseType(derived.rhs()), LhsAdjointType(LhsTransposeType(derived.lhs())));
+  }
+};
+
+}  // end namespace internal
+
+/** \class Product
+ * \ingroup Core_Module
+ *
+ * \brief Expression of the product of two arbitrary matrices or vectors
+ *
+ * \tparam Lhs_ the type of the left-hand side expression
+ * \tparam Rhs_ the type of the right-hand side expression
+ *
+ * This class represents an expression of the product of two arbitrary matrices.
+ *
+ * The other template parameters are:
+ * \tparam Option     can be DefaultProduct, AliasFreeProduct, or LazyProduct
+ *
+ */
+template <typename Lhs_, typename Rhs_, int Option>
+class Product
+    : public ProductImpl<Lhs_, Rhs_, Option,
+                         typename internal::product_promote_storage_type<
+                             typename internal::traits<Lhs_>::StorageKind, typename internal::traits<Rhs_>::StorageKind,
+                             internal::product_type<Lhs_, Rhs_>::ret>::ret> {
+ public:
+  typedef Lhs_ Lhs;
+  typedef Rhs_ Rhs;
+
+  typedef
+      typename ProductImpl<Lhs, Rhs, Option,
+                           typename internal::product_promote_storage_type<
+                               typename internal::traits<Lhs>::StorageKind, typename internal::traits<Rhs>::StorageKind,
+                               internal::product_type<Lhs, Rhs>::ret>::ret>::Base Base;
+  EIGEN_GENERIC_PUBLIC_INTERFACE(Product)
+
+  typedef typename internal::ref_selector<Lhs>::type LhsNested;
+  typedef typename internal::ref_selector<Rhs>::type RhsNested;
+  typedef internal::remove_all_t<LhsNested> LhsNestedCleaned;
+  typedef internal::remove_all_t<RhsNested> RhsNestedCleaned;
+
+  using TransposeReturnType = typename internal::product_transpose_helper<Lhs, Rhs, Option>::TransposeType;
+  using AdjointReturnType = typename internal::product_transpose_helper<Lhs, Rhs, Option>::AdjointType;
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Product(const Lhs& lhs, const Rhs& rhs) : m_lhs(lhs), m_rhs(rhs) {
+    eigen_assert(lhs.cols() == rhs.rows() && "invalid matrix product" &&
+                 "if you wanted a coeff-wise or a dot product use the respective explicit functions");
+  }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Index rows() const noexcept { return m_lhs.rows(); }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Index cols() const noexcept { return m_rhs.cols(); }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const LhsNestedCleaned& lhs() const { return m_lhs; }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const RhsNestedCleaned& rhs() const { return m_rhs; }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TransposeReturnType transpose() const {
+    return internal::product_transpose_helper<Lhs, Rhs, Option>::run_transpose(*this);
+  }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE AdjointReturnType adjoint() const {
+    return internal::product_transpose_helper<Lhs, Rhs, Option>::run_adjoint(*this);
+  }
+
+ protected:
+  LhsNested m_lhs;
+  RhsNested m_rhs;
+};
+
+namespace internal {
+
+template <typename Lhs, typename Rhs, int Option, int ProductTag = internal::product_type<Lhs, Rhs>::ret>
+class dense_product_base : public internal::dense_xpr_base<Product<Lhs, Rhs, Option>>::type {};
+
+/** Conversion to scalar for inner-products */
+template <typename Lhs, typename Rhs, int Option>
+class dense_product_base<Lhs, Rhs, Option, InnerProduct>
+    : public internal::dense_xpr_base<Product<Lhs, Rhs, Option>>::type {
+  typedef Product<Lhs, Rhs, Option> ProductXpr;
+  typedef typename internal::dense_xpr_base<ProductXpr>::type Base;
+
+ public:
+  using Base::derived;
+  typedef typename Base::Scalar Scalar;
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE operator const Scalar() const {
+    return internal::evaluator<ProductXpr>(derived()).coeff(0, 0);
+  }
+};
+
+}  // namespace internal
+
+// Generic API dispatcher
+template <typename Lhs, typename Rhs, int Option, typename StorageKind>
+class ProductImpl : public internal::generic_xpr_base<Product<Lhs, Rhs, Option>, MatrixXpr, StorageKind>::type {
+ public:
+  typedef typename internal::generic_xpr_base<Product<Lhs, Rhs, Option>, MatrixXpr, StorageKind>::type Base;
+};
+
+template <typename Lhs, typename Rhs, int Option>
+class ProductImpl<Lhs, Rhs, Option, Dense> : public internal::dense_product_base<Lhs, Rhs, Option> {
+  typedef Product<Lhs, Rhs, Option> Derived;
+
+ public:
+  typedef typename internal::dense_product_base<Lhs, Rhs, Option> Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(Derived)
+ protected:
+  enum {
+    IsOneByOne = (RowsAtCompileTime == 1 || RowsAtCompileTime == Dynamic) &&
+                 (ColsAtCompileTime == 1 || ColsAtCompileTime == Dynamic),
+    EnableCoeff = IsOneByOne || Option == LazyProduct
+  };
+
+ public:
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Scalar coeff(Index row, Index col) const {
+    EIGEN_STATIC_ASSERT(EnableCoeff, THIS_METHOD_IS_ONLY_FOR_INNER_OR_LAZY_PRODUCTS);
+    eigen_assert((Option == LazyProduct) || (this->rows() == 1 && this->cols() == 1));
+
+    return internal::evaluator<Derived>(derived()).coeff(row, col);
+  }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Scalar coeff(Index i) const {
+    EIGEN_STATIC_ASSERT(EnableCoeff, THIS_METHOD_IS_ONLY_FOR_INNER_OR_LAZY_PRODUCTS);
+    eigen_assert((Option == LazyProduct) || (this->rows() == 1 && this->cols() == 1));
+
+    return internal::evaluator<Derived>(derived()).coeff(i);
+  }
+};
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_PRODUCT_H

eigen-master/Eigen/src/Core/ProductEvaluators.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
+// Copyright (C) 2008-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
+// Copyright (C) 2011 Jitse Niesen <jitse@maths.leeds.ac.uk>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_PRODUCTEVALUATORS_H
+#define EIGEN_PRODUCTEVALUATORS_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+/** \internal
+ * Evaluator of a product expression.
+ * Since products require special treatments to handle all possible cases,
+ * we simply defer the evaluation logic to a product_evaluator class
+ * which offers more partial specialization possibilities.
+ *
+ * \sa class product_evaluator
+ */
+template <typename Lhs, typename Rhs, int Options>
+struct evaluator<Product<Lhs, Rhs, Options>> : public product_evaluator<Product<Lhs, Rhs, Options>> {
+  typedef Product<Lhs, Rhs, Options> XprType;
+  typedef product_evaluator<XprType> Base;
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit evaluator(const XprType& xpr) : Base(xpr) {}
+};
+
+// Catch "scalar * ( A * B )" and transform it to "(A*scalar) * B"
+// TODO we should apply that rule only if that's really helpful
+template <typename Lhs, typename Rhs, typename Scalar1, typename Scalar2, typename Plain1>
+struct evaluator_assume_aliasing<CwiseBinaryOp<internal::scalar_product_op<Scalar1, Scalar2>,
+                                               const CwiseNullaryOp<internal::scalar_constant_op<Scalar1>, Plain1>,
+                                               const Product<Lhs, Rhs, DefaultProduct>>> {
+  static const bool value = true;
+};
+template <typename Lhs, typename Rhs, typename Scalar1, typename Scalar2, typename Plain1>
+struct evaluator<CwiseBinaryOp<internal::scalar_product_op<Scalar1, Scalar2>,
+                               const CwiseNullaryOp<internal::scalar_constant_op<Scalar1>, Plain1>,
+                               const Product<Lhs, Rhs, DefaultProduct>>>
+    : public evaluator<Product<EIGEN_SCALAR_BINARYOP_EXPR_RETURN_TYPE(Scalar1, Lhs, product), Rhs, DefaultProduct>> {
+  typedef CwiseBinaryOp<internal::scalar_product_op<Scalar1, Scalar2>,
+                        const CwiseNullaryOp<internal::scalar_constant_op<Scalar1>, Plain1>,
+                        const Product<Lhs, Rhs, DefaultProduct>>
+      XprType;
+  typedef evaluator<Product<EIGEN_SCALAR_BINARYOP_EXPR_RETURN_TYPE(Scalar1, Lhs, product), Rhs, DefaultProduct>> Base;
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit evaluator(const XprType& xpr)
+      : Base(xpr.lhs().functor().m_other * xpr.rhs().lhs() * xpr.rhs().rhs()) {}
+};
+
+template <typename Lhs, typename Rhs, int DiagIndex>
+struct evaluator<Diagonal<const Product<Lhs, Rhs, DefaultProduct>, DiagIndex>>
+    : public evaluator<Diagonal<const Product<Lhs, Rhs, LazyProduct>, DiagIndex>> {
+  typedef Diagonal<const Product<Lhs, Rhs, DefaultProduct>, DiagIndex> XprType;
+  typedef evaluator<Diagonal<const Product<Lhs, Rhs, LazyProduct>, DiagIndex>> Base;
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit evaluator(const XprType& xpr)
+      : Base(Diagonal<const Product<Lhs, Rhs, LazyProduct>, DiagIndex>(
+            Product<Lhs, Rhs, LazyProduct>(xpr.nestedExpression().lhs(), xpr.nestedExpression().rhs()), xpr.index())) {}
+};
+
+// Helper class to perform a matrix product with the destination at hand.
+// Depending on the sizes of the factors, there are different evaluation strategies
+// as controlled by internal::product_type.
+template <typename Lhs, typename Rhs, typename LhsShape = typename evaluator_traits<Lhs>::Shape,
+          typename RhsShape = typename evaluator_traits<Rhs>::Shape,
+          int ProductType = internal::product_type<Lhs, Rhs>::value>
+struct generic_product_impl;
+
+template <typename Lhs, typename Rhs>
+struct evaluator_assume_aliasing<Product<Lhs, Rhs, DefaultProduct>> {
+  static const bool value = true;
+};
+
+// This is the default evaluator implementation for products:
+// It creates a temporary and call generic_product_impl
+template <typename Lhs, typename Rhs, int Options, int ProductTag, typename LhsShape, typename RhsShape>
+struct product_evaluator<Product<Lhs, Rhs, Options>, ProductTag, LhsShape, RhsShape>
+    : public evaluator<typename Product<Lhs, Rhs, Options>::PlainObject> {
+  typedef Product<Lhs, Rhs, Options> XprType;
+  typedef typename XprType::PlainObject PlainObject;
+  typedef evaluator<PlainObject> Base;
+  enum { Flags = Base::Flags | EvalBeforeNestingBit };
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit product_evaluator(const XprType& xpr)
+      : m_result(xpr.rows(), xpr.cols()) {
+    internal::construct_at<Base>(this, m_result);
+
+    // FIXME shall we handle nested_eval here?,
+    // if so, then we must take care at removing the call to nested_eval in the specializations (e.g., in
+    // permutation_matrix_product, transposition_matrix_product, etc.)
+    //     typedef typename internal::nested_eval<Lhs,Rhs::ColsAtCompileTime>::type LhsNested;
+    //     typedef typename internal::nested_eval<Rhs,Lhs::RowsAtCompileTime>::type RhsNested;
+    //     typedef internal::remove_all_t<LhsNested> LhsNestedCleaned;
+    //     typedef internal::remove_all_t<RhsNested> RhsNestedCleaned;
+    //
+    //     const LhsNested lhs(xpr.lhs());
+    //     const RhsNested rhs(xpr.rhs());
+    //
+    //     generic_product_impl<LhsNestedCleaned, RhsNestedCleaned>::evalTo(m_result, lhs, rhs);
+
+    generic_product_impl<Lhs, Rhs, LhsShape, RhsShape, ProductTag>::evalTo(m_result, xpr.lhs(), xpr.rhs());
+  }
+
+ protected:
+  PlainObject m_result;
+};
+
+// The following three shortcuts are enabled only if the scalar types match exactly.
+// TODO: we could enable them for different scalar types when the product is not vectorized.
+
+// Dense = Product
+template <typename DstXprType, typename Lhs, typename Rhs, int Options, typename Scalar>
+struct Assignment<DstXprType, Product<Lhs, Rhs, Options>, internal::assign_op<Scalar, Scalar>, Dense2Dense,
+                  std::enable_if_t<(Options == DefaultProduct || Options == AliasFreeProduct)>> {
+  typedef Product<Lhs, Rhs, Options> SrcXprType;
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(DstXprType& dst, const SrcXprType& src,
+                                                        const internal::assign_op<Scalar, Scalar>&) {
+    Index dstRows = src.rows();
+    Index dstCols = src.cols();
+    if ((dst.rows() != dstRows) || (dst.cols() != dstCols)) dst.resize(dstRows, dstCols);
+    // FIXME shall we handle nested_eval here?
+    generic_product_impl<Lhs, Rhs>::evalTo(dst, src.lhs(), src.rhs());
+  }
+};
+
+// Dense += Product
+template <typename DstXprType, typename Lhs, typename Rhs, int Options, typename Scalar>
+struct Assignment<DstXprType, Product<Lhs, Rhs, Options>, internal::add_assign_op<Scalar, Scalar>, Dense2Dense,
+                  std::enable_if_t<(Options == DefaultProduct || Options == AliasFreeProduct)>> {
+  typedef Product<Lhs, Rhs, Options> SrcXprType;
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(DstXprType& dst, const SrcXprType& src,
+                                                        const internal::add_assign_op<Scalar, Scalar>&) {
+    eigen_assert(dst.rows() == src.rows() && dst.cols() == src.cols());
+    // FIXME shall we handle nested_eval here?
+    generic_product_impl<Lhs, Rhs>::addTo(dst, src.lhs(), src.rhs());
+  }
+};
+
+// Dense -= Product
+template <typename DstXprType, typename Lhs, typename Rhs, int Options, typename Scalar>
+struct Assignment<DstXprType, Product<Lhs, Rhs, Options>, internal::sub_assign_op<Scalar, Scalar>, Dense2Dense,
+                  std::enable_if_t<(Options == DefaultProduct || Options == AliasFreeProduct)>> {
+  typedef Product<Lhs, Rhs, Options> SrcXprType;
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(DstXprType& dst, const SrcXprType& src,
+                                                        const internal::sub_assign_op<Scalar, Scalar>&) {
+    eigen_assert(dst.rows() == src.rows() && dst.cols() == src.cols());
+    // FIXME shall we handle nested_eval here?
+    generic_product_impl<Lhs, Rhs>::subTo(dst, src.lhs(), src.rhs());
+  }
+};
+
+// Dense ?= scalar * Product
+// TODO we should apply that rule if that's really helpful
+// for instance, this is not good for inner products
+template <typename DstXprType, typename Lhs, typename Rhs, typename AssignFunc, typename Scalar, typename ScalarBis,
+          typename Plain>
+struct Assignment<DstXprType,
+                  CwiseBinaryOp<internal::scalar_product_op<ScalarBis, Scalar>,
+                                const CwiseNullaryOp<internal::scalar_constant_op<ScalarBis>, Plain>,
+                                const Product<Lhs, Rhs, DefaultProduct>>,
+                  AssignFunc, Dense2Dense> {
+  typedef CwiseBinaryOp<internal::scalar_product_op<ScalarBis, Scalar>,
+                        const CwiseNullaryOp<internal::scalar_constant_op<ScalarBis>, Plain>,
+                        const Product<Lhs, Rhs, DefaultProduct>>
+      SrcXprType;
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(DstXprType& dst, const SrcXprType& src,
+                                                        const AssignFunc& func) {
+    call_assignment_no_alias(dst, (src.lhs().functor().m_other * src.rhs().lhs()) * src.rhs().rhs(), func);
+  }
+};
+
+//----------------------------------------
+// Catch "Dense ?= xpr + Product<>" expression to save one temporary
+// FIXME we could probably enable these rules for any product, i.e., not only Dense and DefaultProduct
+
+template <typename OtherXpr, typename Lhs, typename Rhs>
+struct evaluator_assume_aliasing<
+    CwiseBinaryOp<
+        internal::scalar_sum_op<typename OtherXpr::Scalar, typename Product<Lhs, Rhs, DefaultProduct>::Scalar>,
+        const OtherXpr, const Product<Lhs, Rhs, DefaultProduct>>,
+    DenseShape> {
+  static const bool value = true;
+};
+
+template <typename OtherXpr, typename Lhs, typename Rhs>
+struct evaluator_assume_aliasing<
+    CwiseBinaryOp<
+        internal::scalar_difference_op<typename OtherXpr::Scalar, typename Product<Lhs, Rhs, DefaultProduct>::Scalar>,
+        const OtherXpr, const Product<Lhs, Rhs, DefaultProduct>>,
+    DenseShape> {
+  static const bool value = true;
+};
+
+template <typename DstXprType, typename OtherXpr, typename ProductType, typename Func1, typename Func2>
+struct assignment_from_xpr_op_product {
+  template <typename SrcXprType, typename InitialFunc>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(DstXprType& dst, const SrcXprType& src,
+                                                        const InitialFunc& /*func*/) {
+    call_assignment_no_alias(dst, src.lhs(), Func1());
+    call_assignment_no_alias(dst, src.rhs(), Func2());
+  }
+};
+
+#define EIGEN_CATCH_ASSIGN_XPR_OP_PRODUCT(ASSIGN_OP, BINOP, ASSIGN_OP2)                             \
+  template <typename DstXprType, typename OtherXpr, typename Lhs, typename Rhs, typename DstScalar, \
+            typename SrcScalar, typename OtherScalar, typename ProdScalar>                          \
+  struct Assignment<DstXprType,                                                                     \
+                    CwiseBinaryOp<internal::BINOP<OtherScalar, ProdScalar>, const OtherXpr,         \
+                                  const Product<Lhs, Rhs, DefaultProduct>>,                         \
+                    internal::ASSIGN_OP<DstScalar, SrcScalar>, Dense2Dense>                         \
+      : assignment_from_xpr_op_product<DstXprType, OtherXpr, Product<Lhs, Rhs, DefaultProduct>,     \
+                                       internal::ASSIGN_OP<DstScalar, OtherScalar>,                 \
+                                       internal::ASSIGN_OP2<DstScalar, ProdScalar>> {}
+
+EIGEN_CATCH_ASSIGN_XPR_OP_PRODUCT(assign_op, scalar_sum_op, add_assign_op);
+EIGEN_CATCH_ASSIGN_XPR_OP_PRODUCT(add_assign_op, scalar_sum_op, add_assign_op);
+EIGEN_CATCH_ASSIGN_XPR_OP_PRODUCT(sub_assign_op, scalar_sum_op, sub_assign_op);
+
+EIGEN_CATCH_ASSIGN_XPR_OP_PRODUCT(assign_op, scalar_difference_op, sub_assign_op);
+EIGEN_CATCH_ASSIGN_XPR_OP_PRODUCT(add_assign_op, scalar_difference_op, sub_assign_op);
+EIGEN_CATCH_ASSIGN_XPR_OP_PRODUCT(sub_assign_op, scalar_difference_op, add_assign_op);
+
+//----------------------------------------
+
+template <typename Lhs, typename Rhs>
+struct generic_product_impl<Lhs, Rhs, DenseShape, DenseShape, InnerProduct> {
+  using impl = default_inner_product_impl<Lhs, Rhs, false>;
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    dst.coeffRef(0, 0) = impl::run(lhs, rhs);
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void addTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    dst.coeffRef(0, 0) += impl::run(lhs, rhs);
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void subTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    dst.coeffRef(0, 0) -= impl::run(lhs, rhs);
+  }
+};
+
+/***********************************************************************
+ *  Implementation of outer dense * dense vector product
+ ***********************************************************************/
+
+// Column major result
+template <typename Dst, typename Lhs, typename Rhs, typename Func>
+void EIGEN_DEVICE_FUNC outer_product_selector_run(Dst& dst, const Lhs& lhs, const Rhs& rhs, const Func& func,
+                                                  const false_type&) {
+  evaluator<Rhs> rhsEval(rhs);
+  ei_declare_local_nested_eval(Lhs, lhs, Rhs::SizeAtCompileTime, actual_lhs);
+  // FIXME if cols is large enough, then it might be useful to make sure that lhs is sequentially stored
+  // FIXME not very good if rhs is real and lhs complex while alpha is real too
+  const Index cols = dst.cols();
+  for (Index j = 0; j < cols; ++j) func(dst.col(j), rhsEval.coeff(Index(0), j) * actual_lhs);
+}
+
+// Row major result
+template <typename Dst, typename Lhs, typename Rhs, typename Func>
+void EIGEN_DEVICE_FUNC outer_product_selector_run(Dst& dst, const Lhs& lhs, const Rhs& rhs, const Func& func,
+                                                  const true_type&) {
+  evaluator<Lhs> lhsEval(lhs);
+  ei_declare_local_nested_eval(Rhs, rhs, Lhs::SizeAtCompileTime, actual_rhs);
+  // FIXME if rows is large enough, then it might be useful to make sure that rhs is sequentially stored
+  // FIXME not very good if lhs is real and rhs complex while alpha is real too
+  const Index rows = dst.rows();
+  for (Index i = 0; i < rows; ++i) func(dst.row(i), lhsEval.coeff(i, Index(0)) * actual_rhs);
+}
+
+template <typename Lhs, typename Rhs>
+struct generic_product_impl<Lhs, Rhs, DenseShape, DenseShape, OuterProduct> {
+  template <typename T>
+  struct is_row_major : bool_constant<(int(T::Flags) & RowMajorBit)> {};
+  typedef typename Product<Lhs, Rhs>::Scalar Scalar;
+
+  // TODO it would be nice to be able to exploit our *_assign_op functors for that purpose
+  struct set {
+    template <typename Dst, typename Src>
+    EIGEN_DEVICE_FUNC void operator()(const Dst& dst, const Src& src) const {
+      dst.const_cast_derived() = src;
+    }
+  };
+  struct add {
+    /** Add to dst. */
+    template <typename Dst, typename Src>
+    EIGEN_DEVICE_FUNC void operator()(const Dst& dst, const Src& src) const {
+      dst.const_cast_derived() += src;
+    }
+  };
+  struct sub {
+    template <typename Dst, typename Src>
+    EIGEN_DEVICE_FUNC void operator()(const Dst& dst, const Src& src) const {
+      dst.const_cast_derived() -= src;
+    }
+  };
+  /** Scaled add. */
+  struct adds {
+    Scalar m_scale;
+    /** Constructor */
+    explicit adds(const Scalar& s) : m_scale(s) {}
+    /** Scaled add to dst. */
+    template <typename Dst, typename Src>
+    void EIGEN_DEVICE_FUNC operator()(const Dst& dst, const Src& src) const {
+      dst.const_cast_derived() += m_scale * src;
+    }
+  };
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    internal::outer_product_selector_run(dst, lhs, rhs, set(), is_row_major<Dst>());
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void addTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    internal::outer_product_selector_run(dst, lhs, rhs, add(), is_row_major<Dst>());
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void subTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    internal::outer_product_selector_run(dst, lhs, rhs, sub(), is_row_major<Dst>());
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void scaleAndAddTo(Dst& dst, const Lhs& lhs, const Rhs& rhs,
+                                                                  const Scalar& alpha) {
+    internal::outer_product_selector_run(dst, lhs, rhs, adds(alpha), is_row_major<Dst>());
+  }
+};
+
+// This base class provides default implementations for evalTo, addTo, subTo, in terms of scaleAndAddTo
+template <typename Lhs, typename Rhs, typename Derived>
+struct generic_product_impl_base {
+  typedef typename Product<Lhs, Rhs>::Scalar Scalar;
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    dst.setZero();
+    scaleAndAddTo(dst, lhs, rhs, Scalar(1));
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void addTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    scaleAndAddTo(dst, lhs, rhs, Scalar(1));
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void subTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    scaleAndAddTo(dst, lhs, rhs, Scalar(-1));
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void scaleAndAddTo(Dst& dst, const Lhs& lhs, const Rhs& rhs,
+                                                                  const Scalar& alpha) {
+    Derived::scaleAndAddTo(dst, lhs, rhs, alpha);
+  }
+};
+
+template <typename Lhs, typename Rhs>
+struct generic_product_impl<Lhs, Rhs, DenseShape, DenseShape, GemvProduct>
+    : generic_product_impl_base<Lhs, Rhs, generic_product_impl<Lhs, Rhs, DenseShape, DenseShape, GemvProduct>> {
+  typedef typename nested_eval<Lhs, 1>::type LhsNested;
+  typedef typename nested_eval<Rhs, 1>::type RhsNested;
+  typedef typename Product<Lhs, Rhs>::Scalar Scalar;
+  enum { Side = Lhs::IsVectorAtCompileTime ? OnTheLeft : OnTheRight };
+  typedef internal::remove_all_t<std::conditional_t<int(Side) == OnTheRight, LhsNested, RhsNested>> MatrixType;
+
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void scaleAndAddTo(Dest& dst, const Lhs& lhs, const Rhs& rhs,
+                                                                  const Scalar& alpha) {
+    // Fallback to inner product if both the lhs and rhs is a runtime vector.
+    if (lhs.rows() == 1 && rhs.cols() == 1) {
+      dst.coeffRef(0, 0) += alpha * lhs.row(0).conjugate().dot(rhs.col(0));
+      return;
+    }
+    LhsNested actual_lhs(lhs);
+    RhsNested actual_rhs(rhs);
+    internal::gemv_dense_selector<Side, (int(MatrixType::Flags) & RowMajorBit) ? RowMajor : ColMajor,
+                                  bool(internal::blas_traits<MatrixType>::HasUsableDirectAccess)>::run(actual_lhs,
+                                                                                                       actual_rhs, dst,
+                                                                                                       alpha);
+  }
+};
+
+template <typename Lhs, typename Rhs>
+struct generic_product_impl<Lhs, Rhs, DenseShape, DenseShape, CoeffBasedProductMode> {
+  typedef typename Product<Lhs, Rhs>::Scalar Scalar;
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    // Same as: dst.noalias() = lhs.lazyProduct(rhs);
+    // but easier on the compiler side
+    call_assignment_no_alias(dst, lhs.lazyProduct(rhs), internal::assign_op<typename Dst::Scalar, Scalar>());
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void addTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    // dst.noalias() += lhs.lazyProduct(rhs);
+    call_assignment_no_alias(dst, lhs.lazyProduct(rhs), internal::add_assign_op<typename Dst::Scalar, Scalar>());
+  }
+
+  template <typename Dst>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void subTo(Dst& dst, const Lhs& lhs, const Rhs& rhs) {
+    // dst.noalias() -= lhs.lazyProduct(rhs);
+    call_assignment_no_alias(dst, lhs.lazyProduct(rhs), internal::sub_assign_op<typename Dst::Scalar, Scalar>());
+  }
+
+  // This is a special evaluation path called from generic_product_impl<...,GemmProduct> in file GeneralMatrixMatrix.h
+  // This variant tries to extract scalar multiples from both the LHS and RHS and factor them out. For instance:
+  //   dst {,+,-}= (s1*A)*(B*s2)
+  // will be rewritten as:
+  //   dst {,+,-}= (s1*s2) * (A.lazyProduct(B))
+  // There are at least four benefits of doing so:
+  //  1 - huge performance gain for heap-allocated matrix types as it save costly allocations.
+  //  2 - it is faster than simply by-passing the heap allocation through stack allocation.
+  //  3 - it makes this fallback consistent with the heavy GEMM routine.
+  //  4 - it fully by-passes huge stack allocation attempts when multiplying huge fixed-size matrices.
+  //      (see https://stackoverflow.com/questions/54738495)
+  // For small fixed sizes matrices, however, the gains are less obvious, it is sometimes x2 faster, but sometimes x3
+  // slower, and the behavior depends also a lot on the compiler... This is why this re-writing strategy is currently
+  // enabled only when falling back from the main GEMM.
+  template <typename Dst, typename Func>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void eval_dynamic(Dst& dst, const Lhs& lhs, const Rhs& rhs,
+                                                                 const Func& func) {
+    enum {
+      HasScalarFactor = blas_traits<Lhs>::HasScalarFactor || blas_traits<Rhs>::HasScalarFactor,
+      ConjLhs = blas_traits<Lhs>::NeedToConjugate,
+      ConjRhs = blas_traits<Rhs>::NeedToConjugate
+    };
+    // FIXME: in c++11 this should be auto, and extractScalarFactor should also return auto
+    //        this is important for real*complex_mat
+    Scalar actualAlpha = combine_scalar_factors<Scalar>(lhs, rhs);
+
+    eval_dynamic_impl(dst, blas_traits<Lhs>::extract(lhs).template conjugateIf<ConjLhs>(),
+                      blas_traits<Rhs>::extract(rhs).template conjugateIf<ConjRhs>(), func, actualAlpha,
+                      bool_constant<HasScalarFactor>());
+  }
+
+ protected:
+  template <typename Dst, typename LhsT, typename RhsT, typename Func, typename Scalar>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void eval_dynamic_impl(Dst& dst, const LhsT& lhs, const RhsT& rhs,
+                                                                      const Func& func, const Scalar& s /* == 1 */,
+                                                                      false_type) {
+    EIGEN_UNUSED_VARIABLE(s);
+    eigen_internal_assert(numext::is_exactly_one(s));
+    call_restricted_packet_assignment_no_alias(dst, lhs.lazyProduct(rhs), func);
+  }
+
+  template <typename Dst, typename LhsT, typename RhsT, typename Func, typename Scalar>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void eval_dynamic_impl(Dst& dst, const LhsT& lhs, const RhsT& rhs,
+                                                                      const Func& func, const Scalar& s, true_type) {
+    call_restricted_packet_assignment_no_alias(dst, s * lhs.lazyProduct(rhs), func);
+  }
+};
+
+// This specialization enforces the use of a coefficient-based evaluation strategy
+template <typename Lhs, typename Rhs>
+struct generic_product_impl<Lhs, Rhs, DenseShape, DenseShape, LazyCoeffBasedProductMode>
+    : generic_product_impl<Lhs, Rhs, DenseShape, DenseShape, CoeffBasedProductMode> {};
+
+// Case 2: Evaluate coeff by coeff
+//
+// This is mostly taken from CoeffBasedProduct.h
+// The main difference is that we add an extra argument to the etor_product_*_impl::run() function
+// for the inner dimension of the product, because evaluator object do not know their size.
+
+template <int Traversal, int UnrollingIndex, typename Lhs, typename Rhs, typename RetScalar>
+struct etor_product_coeff_impl;
+
+template <int StorageOrder, int UnrollingIndex, typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl;
+
+template <typename Lhs, typename Rhs, int ProductTag>
+struct product_evaluator<Product<Lhs, Rhs, LazyProduct>, ProductTag, DenseShape, DenseShape>
+    : evaluator_base<Product<Lhs, Rhs, LazyProduct>> {
+  typedef Product<Lhs, Rhs, LazyProduct> XprType;
+  typedef typename XprType::Scalar Scalar;
+  typedef typename XprType::CoeffReturnType CoeffReturnType;
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit product_evaluator(const XprType& xpr)
+      : m_lhs(xpr.lhs()),
+        m_rhs(xpr.rhs()),
+        m_lhsImpl(m_lhs),  // FIXME the creation of the evaluator objects should result in a no-op, but check that!
+        m_rhsImpl(m_rhs),  //       Moreover, they are only useful for the packet path, so we could completely disable
+                           //       them when not needed, or perhaps declare them on the fly on the packet method... We
+                           //       have experiment to check what's best.
+        m_innerDim(xpr.lhs().cols()) {
+    EIGEN_INTERNAL_CHECK_COST_VALUE(NumTraits<Scalar>::MulCost);
+    EIGEN_INTERNAL_CHECK_COST_VALUE(NumTraits<Scalar>::AddCost);
+    EIGEN_INTERNAL_CHECK_COST_VALUE(CoeffReadCost);
+#if 0
+    std::cerr << "LhsOuterStrideBytes=  " << LhsOuterStrideBytes << "\n";
+    std::cerr << "RhsOuterStrideBytes=  " << RhsOuterStrideBytes << "\n";
+    std::cerr << "LhsAlignment=         " << LhsAlignment << "\n";
+    std::cerr << "RhsAlignment=         " << RhsAlignment << "\n";
+    std::cerr << "CanVectorizeLhs=      " << CanVectorizeLhs << "\n";
+    std::cerr << "CanVectorizeRhs=      " << CanVectorizeRhs << "\n";
+    std::cerr << "CanVectorizeInner=    " << CanVectorizeInner << "\n";
+    std::cerr << "EvalToRowMajor=       " << EvalToRowMajor << "\n";
+    std::cerr << "Alignment=            " << Alignment << "\n";
+    std::cerr << "Flags=                " << Flags << "\n";
+#endif
+  }
+
+  // Everything below here is taken from CoeffBasedProduct.h
+
+  typedef typename internal::nested_eval<Lhs, Rhs::ColsAtCompileTime>::type LhsNested;
+  typedef typename internal::nested_eval<Rhs, Lhs::RowsAtCompileTime>::type RhsNested;
+
+  typedef internal::remove_all_t<LhsNested> LhsNestedCleaned;
+  typedef internal::remove_all_t<RhsNested> RhsNestedCleaned;
+
+  typedef evaluator<LhsNestedCleaned> LhsEtorType;
+  typedef evaluator<RhsNestedCleaned> RhsEtorType;
+
+  enum {
+    RowsAtCompileTime = LhsNestedCleaned::RowsAtCompileTime,
+    ColsAtCompileTime = RhsNestedCleaned::ColsAtCompileTime,
+    InnerSize = min_size_prefer_fixed(LhsNestedCleaned::ColsAtCompileTime, RhsNestedCleaned::RowsAtCompileTime),
+    MaxRowsAtCompileTime = LhsNestedCleaned::MaxRowsAtCompileTime,
+    MaxColsAtCompileTime = RhsNestedCleaned::MaxColsAtCompileTime
+  };
+
+  typedef typename find_best_packet<Scalar, RowsAtCompileTime>::type LhsVecPacketType;
+  typedef typename find_best_packet<Scalar, ColsAtCompileTime>::type RhsVecPacketType;
+
+  enum {
+
+    LhsCoeffReadCost = LhsEtorType::CoeffReadCost,
+    RhsCoeffReadCost = RhsEtorType::CoeffReadCost,
+    CoeffReadCost = InnerSize == 0 ? NumTraits<Scalar>::ReadCost
+                    : InnerSize == Dynamic
+                        ? HugeCost
+                        : InnerSize * (NumTraits<Scalar>::MulCost + int(LhsCoeffReadCost) + int(RhsCoeffReadCost)) +
+                              (InnerSize - 1) * NumTraits<Scalar>::AddCost,
+
+    Unroll = CoeffReadCost <= EIGEN_UNROLLING_LIMIT,
+
+    LhsFlags = LhsEtorType::Flags,
+    RhsFlags = RhsEtorType::Flags,
+
+    LhsRowMajor = LhsFlags & RowMajorBit,
+    RhsRowMajor = RhsFlags & RowMajorBit,
+
+    LhsVecPacketSize = unpacket_traits<LhsVecPacketType>::size,
+    RhsVecPacketSize = unpacket_traits<RhsVecPacketType>::size,
+
+    // Here, we don't care about alignment larger than the usable packet size.
+    LhsAlignment =
+        plain_enum_min(LhsEtorType::Alignment, LhsVecPacketSize* int(sizeof(typename LhsNestedCleaned::Scalar))),
+    RhsAlignment =
+        plain_enum_min(RhsEtorType::Alignment, RhsVecPacketSize* int(sizeof(typename RhsNestedCleaned::Scalar))),
+
+    SameType = is_same<typename LhsNestedCleaned::Scalar, typename RhsNestedCleaned::Scalar>::value,
+
+    CanVectorizeRhs = bool(RhsRowMajor) && (RhsFlags & PacketAccessBit) && (ColsAtCompileTime != 1),
+    CanVectorizeLhs = (!LhsRowMajor) && (LhsFlags & PacketAccessBit) && (RowsAtCompileTime != 1),
+
+    EvalToRowMajor = (MaxRowsAtCompileTime == 1 && MaxColsAtCompileTime != 1) ? 1
+                     : (MaxColsAtCompileTime == 1 && MaxRowsAtCompileTime != 1)
+                         ? 0
+                         : (bool(RhsRowMajor) && !CanVectorizeLhs),
+
+    Flags = ((int(LhsFlags) | int(RhsFlags)) & HereditaryBits & ~RowMajorBit) |
+            (EvalToRowMajor ? RowMajorBit : 0)
+            // TODO enable vectorization for mixed types
+            | (SameType && (CanVectorizeLhs || CanVectorizeRhs) ? PacketAccessBit : 0) |
+            (XprType::IsVectorAtCompileTime ? LinearAccessBit : 0),
+
+    LhsOuterStrideBytes =
+        int(LhsNestedCleaned::OuterStrideAtCompileTime) * int(sizeof(typename LhsNestedCleaned::Scalar)),
+    RhsOuterStrideBytes =
+        int(RhsNestedCleaned::OuterStrideAtCompileTime) * int(sizeof(typename RhsNestedCleaned::Scalar)),
+
+    Alignment = bool(CanVectorizeLhs)
+                    ? (LhsOuterStrideBytes <= 0 || (int(LhsOuterStrideBytes) % plain_enum_max(1, LhsAlignment)) != 0
+                           ? 0
+                           : LhsAlignment)
+                : bool(CanVectorizeRhs)
+                    ? (RhsOuterStrideBytes <= 0 || (int(RhsOuterStrideBytes) % plain_enum_max(1, RhsAlignment)) != 0
+                           ? 0
+                           : RhsAlignment)
+                    : 0,
+
+    /* CanVectorizeInner deserves special explanation. It does not affect the product flags. It is not used outside
+     * of Product. If the Product itself is not a packet-access expression, there is still a chance that the inner
+     * loop of the product might be vectorized. This is the meaning of CanVectorizeInner. Since it doesn't affect
+     * the Flags, it is safe to make this value depend on ActualPacketAccessBit, that doesn't affect the ABI.
+     */
+    CanVectorizeInner = SameType && LhsRowMajor && (!RhsRowMajor) &&
+                        (int(LhsFlags) & int(RhsFlags) & ActualPacketAccessBit) &&
+                        (int(InnerSize) % packet_traits<Scalar>::size == 0)
+  };
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const CoeffReturnType coeff(Index row, Index col) const {
+    return (m_lhs.row(row).transpose().cwiseProduct(m_rhs.col(col))).sum();
+  }
+
+  /* Allow index-based non-packet access. It is impossible though to allow index-based packed access,
+   * which is why we don't set the LinearAccessBit.
+   * TODO: this seems possible when the result is a vector
+   */
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const CoeffReturnType coeff(Index index) const {
+    const Index row = (RowsAtCompileTime == 1 || MaxRowsAtCompileTime == 1) ? 0 : index;
+    const Index col = (RowsAtCompileTime == 1 || MaxRowsAtCompileTime == 1) ? index : 0;
+    return (m_lhs.row(row).transpose().cwiseProduct(m_rhs.col(col))).sum();
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const PacketType packet(Index row, Index col) const {
+    PacketType res;
+    typedef etor_product_packet_impl<bool(int(Flags) & RowMajorBit) ? RowMajor : ColMajor,
+                                     Unroll ? int(InnerSize) : Dynamic, LhsEtorType, RhsEtorType, PacketType, LoadMode>
+        PacketImpl;
+    PacketImpl::run(row, col, m_lhsImpl, m_rhsImpl, m_innerDim, res);
+    return res;
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const PacketType packet(Index index) const {
+    const Index row = (RowsAtCompileTime == 1 || MaxRowsAtCompileTime == 1) ? 0 : index;
+    const Index col = (RowsAtCompileTime == 1 || MaxRowsAtCompileTime == 1) ? index : 0;
+    return packet<LoadMode, PacketType>(row, col);
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const PacketType packetSegment(Index row, Index col, Index begin,
+                                                                       Index count) const {
+    PacketType res;
+    typedef etor_product_packet_impl<bool(int(Flags) & RowMajorBit) ? RowMajor : ColMajor,
+                                     Unroll ? int(InnerSize) : Dynamic, LhsEtorType, RhsEtorType, PacketType, LoadMode>
+        PacketImpl;
+    PacketImpl::run_segment(row, col, m_lhsImpl, m_rhsImpl, m_innerDim, res, begin, count);
+    return res;
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const PacketType packetSegment(Index index, Index begin, Index count) const {
+    const Index row = (RowsAtCompileTime == 1 || MaxRowsAtCompileTime == 1) ? 0 : index;
+    const Index col = (RowsAtCompileTime == 1 || MaxRowsAtCompileTime == 1) ? index : 0;
+    return packetSegment<LoadMode, PacketType>(row, col, begin, count);
+  }
+
+ protected:
+  add_const_on_value_type_t<LhsNested> m_lhs;
+  add_const_on_value_type_t<RhsNested> m_rhs;
+
+  LhsEtorType m_lhsImpl;
+  RhsEtorType m_rhsImpl;
+
+  // TODO: Get rid of m_innerDim if known at compile time
+  Index m_innerDim;
+};
+
+template <typename Lhs, typename Rhs>
+struct product_evaluator<Product<Lhs, Rhs, DefaultProduct>, LazyCoeffBasedProductMode, DenseShape, DenseShape>
+    : product_evaluator<Product<Lhs, Rhs, LazyProduct>, CoeffBasedProductMode, DenseShape, DenseShape> {
+  typedef Product<Lhs, Rhs, DefaultProduct> XprType;
+  typedef Product<Lhs, Rhs, LazyProduct> BaseProduct;
+  typedef product_evaluator<BaseProduct, CoeffBasedProductMode, DenseShape, DenseShape> Base;
+  enum { Flags = Base::Flags | EvalBeforeNestingBit };
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit product_evaluator(const XprType& xpr)
+      : Base(BaseProduct(xpr.lhs(), xpr.rhs())) {}
+};
+
+/****************************************
+*** Coeff based product, Packet path  ***
+****************************************/
+
+template <int UnrollingIndex, typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl<RowMajor, UnrollingIndex, Lhs, Rhs, Packet, LoadMode> {
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                        Index innerDim, Packet& res) {
+    etor_product_packet_impl<RowMajor, UnrollingIndex - 1, Lhs, Rhs, Packet, LoadMode>::run(row, col, lhs, rhs,
+                                                                                            innerDim, res);
+    res = pmadd(pset1<Packet>(lhs.coeff(row, Index(UnrollingIndex - 1))),
+                rhs.template packet<LoadMode, Packet>(Index(UnrollingIndex - 1), col), res);
+  }
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run_segment(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                                Index innerDim, Packet& res, Index begin, Index count) {
+    etor_product_packet_impl<RowMajor, UnrollingIndex - 1, Lhs, Rhs, Packet, LoadMode>::run_segment(
+        row, col, lhs, rhs, innerDim, res, begin, count);
+    res = pmadd(pset1<Packet>(lhs.coeff(row, Index(UnrollingIndex - 1))),
+                rhs.template packetSegment<LoadMode, Packet>(Index(UnrollingIndex - 1), col, begin, count), res);
+  }
+};
+
+template <int UnrollingIndex, typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl<ColMajor, UnrollingIndex, Lhs, Rhs, Packet, LoadMode> {
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                        Index innerDim, Packet& res) {
+    etor_product_packet_impl<ColMajor, UnrollingIndex - 1, Lhs, Rhs, Packet, LoadMode>::run(row, col, lhs, rhs,
+                                                                                            innerDim, res);
+    res = pmadd(lhs.template packet<LoadMode, Packet>(row, Index(UnrollingIndex - 1)),
+                pset1<Packet>(rhs.coeff(Index(UnrollingIndex - 1), col)), res);
+  }
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run_segment(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                                Index innerDim, Packet& res, Index begin, Index count) {
+    etor_product_packet_impl<ColMajor, UnrollingIndex - 1, Lhs, Rhs, Packet, LoadMode>::run_segment(
+        row, col, lhs, rhs, innerDim, res, begin, count);
+    res = pmadd(lhs.template packetSegment<LoadMode, Packet>(row, Index(UnrollingIndex - 1), begin, count),
+                pset1<Packet>(rhs.coeff(Index(UnrollingIndex - 1), col)), res);
+  }
+};
+
+template <typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl<RowMajor, 1, Lhs, Rhs, Packet, LoadMode> {
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                        Index /*innerDim*/, Packet& res) {
+    res = pmul(pset1<Packet>(lhs.coeff(row, Index(0))), rhs.template packet<LoadMode, Packet>(Index(0), col));
+  }
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run_segment(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                                Index /*innerDim*/, Packet& res, Index begin,
+                                                                Index count) {
+    res = pmul(pset1<Packet>(lhs.coeff(row, Index(0))),
+               rhs.template packetSegment<LoadMode, Packet>(Index(0), col, begin, count));
+  }
+};
+
+template <typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl<ColMajor, 1, Lhs, Rhs, Packet, LoadMode> {
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                        Index /*innerDim*/, Packet& res) {
+    res = pmul(lhs.template packet<LoadMode, Packet>(row, Index(0)), pset1<Packet>(rhs.coeff(Index(0), col)));
+  }
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run_segment(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                                Index /*innerDim*/, Packet& res, Index begin,
+                                                                Index count) {
+    res = pmul(lhs.template packetSegment<LoadMode, Packet>(row, Index(0), begin, count),
+               pset1<Packet>(rhs.coeff(Index(0), col)));
+  }
+};
+
+template <typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl<RowMajor, 0, Lhs, Rhs, Packet, LoadMode> {
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Index /*row*/, Index /*col*/, const Lhs& /*lhs*/,
+                                                        const Rhs& /*rhs*/, Index /*innerDim*/, Packet& res) {
+    res = pset1<Packet>(typename unpacket_traits<Packet>::type(0));
+  }
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run_segment(Index /*row*/, Index /*col*/, const Lhs& /*lhs*/,
+                                                                const Rhs& /*rhs*/, Index /*innerDim*/, Packet& res,
+                                                                Index /*begin*/, Index /*count*/) {
+    res = pset1<Packet>(typename unpacket_traits<Packet>::type(0));
+  }
+};
+
+template <typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl<ColMajor, 0, Lhs, Rhs, Packet, LoadMode> {
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Index /*row*/, Index /*col*/, const Lhs& /*lhs*/,
+                                                        const Rhs& /*rhs*/, Index /*innerDim*/, Packet& res) {
+    res = pset1<Packet>(typename unpacket_traits<Packet>::type(0));
+  }
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run_segment(Index /*row*/, Index /*col*/, const Lhs& /*lhs*/,
+                                                                const Rhs& /*rhs*/, Index /*innerDim*/, Packet& res,
+                                                                Index /*begin*/, Index /*count*/) {
+    res = pset1<Packet>(typename unpacket_traits<Packet>::type(0));
+  }
+};
+
+template <typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl<RowMajor, Dynamic, Lhs, Rhs, Packet, LoadMode> {
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                        Index innerDim, Packet& res) {
+    res = pset1<Packet>(typename unpacket_traits<Packet>::type(0));
+    for (Index i = 0; i < innerDim; ++i)
+      res = pmadd(pset1<Packet>(lhs.coeff(row, i)), rhs.template packet<LoadMode, Packet>(i, col), res);
+  }
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run_segment(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                                Index innerDim, Packet& res, Index begin, Index count) {
+    res = pset1<Packet>(typename unpacket_traits<Packet>::type(0));
+    for (Index i = 0; i < innerDim; ++i)
+      res = pmadd(pset1<Packet>(lhs.coeff(row, i)), rhs.template packetSegment<LoadMode, Packet>(i, col, begin, count),
+                  res);
+  }
+};
+
+template <typename Lhs, typename Rhs, typename Packet, int LoadMode>
+struct etor_product_packet_impl<ColMajor, Dynamic, Lhs, Rhs, Packet, LoadMode> {
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                        Index innerDim, Packet& res) {
+    res = pset1<Packet>(typename unpacket_traits<Packet>::type(0));
+    for (Index i = 0; i < innerDim; ++i)
+      res = pmadd(lhs.template packet<LoadMode, Packet>(row, i), pset1<Packet>(rhs.coeff(i, col)), res);
+  }
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run_segment(Index row, Index col, const Lhs& lhs, const Rhs& rhs,
+                                                                Index innerDim, Packet& res, Index begin, Index count) {
+    res = pset1<Packet>(typename unpacket_traits<Packet>::type(0));
+    for (Index i = 0; i < innerDim; ++i)
+      res = pmadd(lhs.template packetSegment<LoadMode, Packet>(row, i, begin, count), pset1<Packet>(rhs.coeff(i, col)),
+                  res);
+  }
+};
+
+/***************************************************************************
+ * Triangular products
+ ***************************************************************************/
+template <int Mode, bool LhsIsTriangular, typename Lhs, bool LhsIsVector, typename Rhs, bool RhsIsVector>
+struct triangular_product_impl;
+
+template <typename Lhs, typename Rhs, int ProductTag>
+struct generic_product_impl<Lhs, Rhs, TriangularShape, DenseShape, ProductTag>
+    : generic_product_impl_base<Lhs, Rhs, generic_product_impl<Lhs, Rhs, TriangularShape, DenseShape, ProductTag>> {
+  typedef typename Product<Lhs, Rhs>::Scalar Scalar;
+
+  template <typename Dest>
+  static void scaleAndAddTo(Dest& dst, const Lhs& lhs, const Rhs& rhs, const Scalar& alpha) {
+    triangular_product_impl<Lhs::Mode, true, typename Lhs::MatrixType, false, Rhs, Rhs::ColsAtCompileTime == 1>::run(
+        dst, lhs.nestedExpression(), rhs, alpha);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag>
+struct generic_product_impl<Lhs, Rhs, DenseShape, TriangularShape, ProductTag>
+    : generic_product_impl_base<Lhs, Rhs, generic_product_impl<Lhs, Rhs, DenseShape, TriangularShape, ProductTag>> {
+  typedef typename Product<Lhs, Rhs>::Scalar Scalar;
+
+  template <typename Dest>
+  static void scaleAndAddTo(Dest& dst, const Lhs& lhs, const Rhs& rhs, const Scalar& alpha) {
+    triangular_product_impl<Rhs::Mode, false, Lhs, Lhs::RowsAtCompileTime == 1, typename Rhs::MatrixType, false>::run(
+        dst, lhs, rhs.nestedExpression(), alpha);
+  }
+};
+
+/***************************************************************************
+ * SelfAdjoint products
+ ***************************************************************************/
+template <typename Lhs, int LhsMode, bool LhsIsVector, typename Rhs, int RhsMode, bool RhsIsVector>
+struct selfadjoint_product_impl;
+
+template <typename Lhs, typename Rhs, int ProductTag>
+struct generic_product_impl<Lhs, Rhs, SelfAdjointShape, DenseShape, ProductTag>
+    : generic_product_impl_base<Lhs, Rhs, generic_product_impl<Lhs, Rhs, SelfAdjointShape, DenseShape, ProductTag>> {
+  typedef typename Product<Lhs, Rhs>::Scalar Scalar;
+
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC void scaleAndAddTo(Dest& dst, const Lhs& lhs, const Rhs& rhs, const Scalar& alpha) {
+    selfadjoint_product_impl<typename Lhs::MatrixType, Lhs::Mode, false, Rhs, 0, Rhs::IsVectorAtCompileTime>::run(
+        dst, lhs.nestedExpression(), rhs, alpha);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag>
+struct generic_product_impl<Lhs, Rhs, DenseShape, SelfAdjointShape, ProductTag>
+    : generic_product_impl_base<Lhs, Rhs, generic_product_impl<Lhs, Rhs, DenseShape, SelfAdjointShape, ProductTag>> {
+  typedef typename Product<Lhs, Rhs>::Scalar Scalar;
+
+  template <typename Dest>
+  static void scaleAndAddTo(Dest& dst, const Lhs& lhs, const Rhs& rhs, const Scalar& alpha) {
+    selfadjoint_product_impl<Lhs, 0, Lhs::IsVectorAtCompileTime, typename Rhs::MatrixType, Rhs::Mode, false>::run(
+        dst, lhs, rhs.nestedExpression(), alpha);
+  }
+};
+
+/***************************************************************************
+ * Diagonal products
+ ***************************************************************************/
+
+template <typename MatrixType, typename DiagonalType, typename Derived, int ProductOrder>
+struct diagonal_product_evaluator_base : evaluator_base<Derived> {
+  typedef typename ScalarBinaryOpTraits<typename MatrixType::Scalar, typename DiagonalType::Scalar>::ReturnType Scalar;
+
+ public:
+  enum {
+    CoeffReadCost = int(NumTraits<Scalar>::MulCost) + int(evaluator<MatrixType>::CoeffReadCost) +
+                    int(evaluator<DiagonalType>::CoeffReadCost),
+
+    MatrixFlags = evaluator<MatrixType>::Flags,
+    DiagFlags = evaluator<DiagonalType>::Flags,
+
+    StorageOrder_ = (Derived::MaxRowsAtCompileTime == 1 && Derived::MaxColsAtCompileTime != 1)   ? RowMajor
+                    : (Derived::MaxColsAtCompileTime == 1 && Derived::MaxRowsAtCompileTime != 1) ? ColMajor
+                    : MatrixFlags & RowMajorBit                                                  ? RowMajor
+                                                                                                 : ColMajor,
+    SameStorageOrder_ = int(StorageOrder_) == ((MatrixFlags & RowMajorBit) ? RowMajor : ColMajor),
+
+    ScalarAccessOnDiag_ = !((int(StorageOrder_) == ColMajor && int(ProductOrder) == OnTheLeft) ||
+                            (int(StorageOrder_) == RowMajor && int(ProductOrder) == OnTheRight)),
+    SameTypes_ = is_same<typename MatrixType::Scalar, typename DiagonalType::Scalar>::value,
+    // FIXME currently we need same types, but in the future the next rule should be the one
+    // Vectorizable_ = bool(int(MatrixFlags)&PacketAccessBit) && ((!_PacketOnDiag) || (SameTypes_ &&
+    // bool(int(DiagFlags)&PacketAccessBit))),
+    Vectorizable_ = bool(int(MatrixFlags) & PacketAccessBit) && SameTypes_ &&
+                    (SameStorageOrder_ || (MatrixFlags & LinearAccessBit) == LinearAccessBit) &&
+                    (ScalarAccessOnDiag_ || (bool(int(DiagFlags) & PacketAccessBit))),
+    LinearAccessMask_ =
+        (MatrixType::RowsAtCompileTime == 1 || MatrixType::ColsAtCompileTime == 1) ? LinearAccessBit : 0,
+    Flags =
+        ((HereditaryBits | LinearAccessMask_) & (unsigned int)(MatrixFlags)) | (Vectorizable_ ? PacketAccessBit : 0),
+    Alignment = evaluator<MatrixType>::Alignment,
+
+    AsScalarProduct =
+        (DiagonalType::SizeAtCompileTime == 1) ||
+        (DiagonalType::SizeAtCompileTime == Dynamic && MatrixType::RowsAtCompileTime == 1 &&
+         ProductOrder == OnTheLeft) ||
+        (DiagonalType::SizeAtCompileTime == Dynamic && MatrixType::ColsAtCompileTime == 1 && ProductOrder == OnTheRight)
+  };
+
+  EIGEN_DEVICE_FUNC diagonal_product_evaluator_base(const MatrixType& mat, const DiagonalType& diag)
+      : m_diagImpl(diag), m_matImpl(mat) {
+    EIGEN_INTERNAL_CHECK_COST_VALUE(NumTraits<Scalar>::MulCost);
+    EIGEN_INTERNAL_CHECK_COST_VALUE(CoeffReadCost);
+  }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Scalar coeff(Index idx) const {
+    if (AsScalarProduct)
+      return m_diagImpl.coeff(0) * m_matImpl.coeff(idx);
+    else
+      return m_diagImpl.coeff(idx) * m_matImpl.coeff(idx);
+  }
+
+ protected:
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packet_impl(Index row, Index col, Index id, internal::true_type) const {
+    return internal::pmul(m_matImpl.template packet<LoadMode, PacketType>(row, col),
+                          internal::pset1<PacketType>(m_diagImpl.coeff(id)));
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packet_impl(Index row, Index col, Index id, internal::false_type) const {
+    enum {
+      InnerSize = (MatrixType::Flags & RowMajorBit) ? MatrixType::ColsAtCompileTime : MatrixType::RowsAtCompileTime,
+      DiagonalPacketLoadMode = plain_enum_min(
+          LoadMode,
+          ((InnerSize % 16) == 0) ? int(Aligned16) : int(evaluator<DiagonalType>::Alignment))  // FIXME hardcoded 16!!
+    };
+    return internal::pmul(m_matImpl.template packet<LoadMode, PacketType>(row, col),
+                          m_diagImpl.template packet<DiagonalPacketLoadMode, PacketType>(id));
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packet_segment_impl(Index row, Index col, Index id, Index begin, Index count,
+                                                     internal::true_type) const {
+    return internal::pmul(m_matImpl.template packetSegment<LoadMode, PacketType>(row, col, begin, count),
+                          internal::pset1<PacketType>(m_diagImpl.coeff(id)));
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packet_segment_impl(Index row, Index col, Index id, Index begin, Index count,
+                                                     internal::false_type) const {
+    enum {
+      InnerSize = (MatrixType::Flags & RowMajorBit) ? MatrixType::ColsAtCompileTime : MatrixType::RowsAtCompileTime,
+      DiagonalPacketLoadMode = plain_enum_min(
+          LoadMode,
+          ((InnerSize % 16) == 0) ? int(Aligned16) : int(evaluator<DiagonalType>::Alignment))  // FIXME hardcoded 16!!
+    };
+    return internal::pmul(m_matImpl.template packetSegment<LoadMode, PacketType>(row, col, begin, count),
+                          m_diagImpl.template packetSegment<DiagonalPacketLoadMode, PacketType>(id, begin, count));
+  }
+
+  evaluator<DiagonalType> m_diagImpl;
+  evaluator<MatrixType> m_matImpl;
+};
+
+// diagonal * dense
+template <typename Lhs, typename Rhs, int ProductKind, int ProductTag>
+struct product_evaluator<Product<Lhs, Rhs, ProductKind>, ProductTag, DiagonalShape, DenseShape>
+    : diagonal_product_evaluator_base<Rhs, typename Lhs::DiagonalVectorType, Product<Lhs, Rhs, LazyProduct>,
+                                      OnTheLeft> {
+  typedef diagonal_product_evaluator_base<Rhs, typename Lhs::DiagonalVectorType, Product<Lhs, Rhs, LazyProduct>,
+                                          OnTheLeft>
+      Base;
+  using Base::coeff;
+  using Base::m_diagImpl;
+  using Base::m_matImpl;
+  typedef typename Base::Scalar Scalar;
+
+  typedef Product<Lhs, Rhs, ProductKind> XprType;
+  typedef typename XprType::PlainObject PlainObject;
+  typedef typename Lhs::DiagonalVectorType DiagonalType;
+
+  static constexpr int StorageOrder = Base::StorageOrder_;
+  using IsRowMajor_t = bool_constant<StorageOrder == RowMajor>;
+
+  EIGEN_DEVICE_FUNC explicit product_evaluator(const XprType& xpr) : Base(xpr.rhs(), xpr.lhs().diagonal()) {}
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Scalar coeff(Index row, Index col) const {
+    return m_diagImpl.coeff(row) * m_matImpl.coeff(row, col);
+  }
+
+#ifndef EIGEN_GPUCC
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packet(Index row, Index col) const {
+    // FIXME: NVCC used to complain about the template keyword, but we have to check whether this is still the case.
+    // See also similar calls below.
+    return this->template packet_impl<LoadMode, PacketType>(row, col, row, IsRowMajor_t());
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packet(Index idx) const {
+    return packet<LoadMode, PacketType>(int(StorageOrder) == ColMajor ? idx : 0,
+                                        int(StorageOrder) == ColMajor ? 0 : idx);
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packetSegment(Index row, Index col, Index begin, Index count) const {
+    // FIXME: NVCC used to complain about the template keyword, but we have to check whether this is still the case.
+    // See also similar calls below.
+    return this->template packet_segment_impl<LoadMode, PacketType>(row, col, row, begin, count, IsRowMajor_t());
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packetSegment(Index idx, Index begin, Index count) const {
+    return packetSegment<LoadMode, PacketType>(StorageOrder == ColMajor ? idx : 0, StorageOrder == ColMajor ? 0 : idx,
+                                               begin, count);
+  }
+#endif
+};
+
+// dense * diagonal
+template <typename Lhs, typename Rhs, int ProductKind, int ProductTag>
+struct product_evaluator<Product<Lhs, Rhs, ProductKind>, ProductTag, DenseShape, DiagonalShape>
+    : diagonal_product_evaluator_base<Lhs, typename Rhs::DiagonalVectorType, Product<Lhs, Rhs, LazyProduct>,
+                                      OnTheRight> {
+  typedef diagonal_product_evaluator_base<Lhs, typename Rhs::DiagonalVectorType, Product<Lhs, Rhs, LazyProduct>,
+                                          OnTheRight>
+      Base;
+  using Base::coeff;
+  using Base::m_diagImpl;
+  using Base::m_matImpl;
+  typedef typename Base::Scalar Scalar;
+
+  typedef Product<Lhs, Rhs, ProductKind> XprType;
+  typedef typename XprType::PlainObject PlainObject;
+
+  static constexpr int StorageOrder = Base::StorageOrder_;
+  using IsColMajor_t = bool_constant<StorageOrder == ColMajor>;
+
+  EIGEN_DEVICE_FUNC explicit product_evaluator(const XprType& xpr) : Base(xpr.lhs(), xpr.rhs().diagonal()) {}
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Scalar coeff(Index row, Index col) const {
+    return m_matImpl.coeff(row, col) * m_diagImpl.coeff(col);
+  }
+
+#ifndef EIGEN_GPUCC
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packet(Index row, Index col) const {
+    return this->template packet_impl<LoadMode, PacketType>(row, col, col, IsColMajor_t());
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packet(Index idx) const {
+    return packet<LoadMode, PacketType>(StorageOrder == ColMajor ? idx : 0, StorageOrder == ColMajor ? 0 : idx);
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packetSegment(Index row, Index col, Index begin, Index count) const {
+    return this->template packet_segment_impl<LoadMode, PacketType>(row, col, col, begin, count, IsColMajor_t());
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_STRONG_INLINE PacketType packetSegment(Index idx, Index begin, Index count) const {
+    return packetSegment<LoadMode, PacketType>(StorageOrder == ColMajor ? idx : 0, StorageOrder == ColMajor ? 0 : idx,
+                                               begin, count);
+  }
+#endif
+};
+
+/***************************************************************************
+ * Products with permutation matrices
+ ***************************************************************************/
+
+/** \internal
+ * \class permutation_matrix_product
+ * Internal helper class implementing the product between a permutation matrix and a matrix.
+ * This class is specialized for DenseShape below and for SparseShape in SparseCore/SparsePermutation.h
+ */
+template <typename ExpressionType, int Side, bool Transposed, typename ExpressionShape>
+struct permutation_matrix_product;
+
+template <typename ExpressionType, int Side, bool Transposed>
+struct permutation_matrix_product<ExpressionType, Side, Transposed, DenseShape> {
+  typedef typename nested_eval<ExpressionType, 1>::type MatrixType;
+  typedef remove_all_t<MatrixType> MatrixTypeCleaned;
+
+  template <typename Dest, typename PermutationType>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Dest& dst, const PermutationType& perm,
+                                                        const ExpressionType& xpr) {
+    MatrixType mat(xpr);
+    const Index n = Side == OnTheLeft ? mat.rows() : mat.cols();
+    // FIXME we need an is_same for expression that is not sensitive to constness. For instance
+    // is_same_xpr<Block<const Matrix>, Block<Matrix> >::value should be true.
+    // if(is_same<MatrixTypeCleaned,Dest>::value && extract_data(dst) == extract_data(mat))
+    if (is_same_dense(dst, mat)) {
+      // apply the permutation inplace
+      Matrix<bool, PermutationType::RowsAtCompileTime, 1, 0, PermutationType::MaxRowsAtCompileTime> mask(perm.size());
+      mask.fill(false);
+      Index r = 0;
+      while (r < perm.size()) {
+        // search for the next seed
+        while (r < perm.size() && mask[r]) r++;
+        if (r >= perm.size()) break;
+        // we got one, let's follow it until we are back to the seed
+        Index k0 = r++;
+        Index kPrev = k0;
+        mask.coeffRef(k0) = true;
+        for (Index k = perm.indices().coeff(k0); k != k0; k = perm.indices().coeff(k)) {
+          Block<Dest, Side == OnTheLeft ? 1 : Dest::RowsAtCompileTime,
+                Side == OnTheRight ? 1 : Dest::ColsAtCompileTime>(dst, k)
+              .swap(Block < Dest, Side == OnTheLeft ? 1 : Dest::RowsAtCompileTime,
+                    Side == OnTheRight
+                        ? 1
+                        : Dest::ColsAtCompileTime > (dst, ((Side == OnTheLeft) ^ Transposed) ? k0 : kPrev));
+
+          mask.coeffRef(k) = true;
+          kPrev = k;
+        }
+      }
+    } else {
+      for (Index i = 0; i < n; ++i) {
+        Block<Dest, Side == OnTheLeft ? 1 : Dest::RowsAtCompileTime, Side == OnTheRight ? 1 : Dest::ColsAtCompileTime>(
+            dst, ((Side == OnTheLeft) ^ Transposed) ? perm.indices().coeff(i) : i)
+
+            =
+
+                Block < const MatrixTypeCleaned,
+            Side == OnTheLeft ? 1 : MatrixTypeCleaned::RowsAtCompileTime,
+            Side == OnTheRight ? 1
+                               : MatrixTypeCleaned::ColsAtCompileTime >
+                                     (mat, ((Side == OnTheRight) ^ Transposed) ? perm.indices().coeff(i) : i);
+      }
+    }
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Lhs, Rhs, PermutationShape, MatrixShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Rhs& rhs) {
+    permutation_matrix_product<Rhs, OnTheLeft, false, MatrixShape>::run(dst, lhs, rhs);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Lhs, Rhs, MatrixShape, PermutationShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Rhs& rhs) {
+    permutation_matrix_product<Lhs, OnTheRight, false, MatrixShape>::run(dst, rhs, lhs);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Inverse<Lhs>, Rhs, PermutationShape, MatrixShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Inverse<Lhs>& lhs, const Rhs& rhs) {
+    permutation_matrix_product<Rhs, OnTheLeft, true, MatrixShape>::run(dst, lhs.nestedExpression(), rhs);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Lhs, Inverse<Rhs>, MatrixShape, PermutationShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Inverse<Rhs>& rhs) {
+    permutation_matrix_product<Lhs, OnTheRight, true, MatrixShape>::run(dst, rhs.nestedExpression(), lhs);
+  }
+};
+
+/***************************************************************************
+ * Products with transpositions matrices
+ ***************************************************************************/
+
+// FIXME could we unify Transpositions and Permutation into a single "shape"??
+
+/** \internal
+ * \class transposition_matrix_product
+ * Internal helper class implementing the product between a permutation matrix and a matrix.
+ */
+template <typename ExpressionType, int Side, bool Transposed, typename ExpressionShape>
+struct transposition_matrix_product {
+  typedef typename nested_eval<ExpressionType, 1>::type MatrixType;
+  typedef remove_all_t<MatrixType> MatrixTypeCleaned;
+
+  template <typename Dest, typename TranspositionType>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void run(Dest& dst, const TranspositionType& tr,
+                                                        const ExpressionType& xpr) {
+    MatrixType mat(xpr);
+    typedef typename TranspositionType::StorageIndex StorageIndex;
+    const Index size = tr.size();
+    StorageIndex j = 0;
+
+    if (!is_same_dense(dst, mat)) dst = mat;
+
+    for (Index k = (Transposed ? size - 1 : 0); Transposed ? k >= 0 : k < size; Transposed ? --k : ++k)
+      if (Index(j = tr.coeff(k)) != k) {
+        if (Side == OnTheLeft)
+          dst.row(k).swap(dst.row(j));
+        else if (Side == OnTheRight)
+          dst.col(k).swap(dst.col(j));
+      }
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Lhs, Rhs, TranspositionsShape, MatrixShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Rhs& rhs) {
+    transposition_matrix_product<Rhs, OnTheLeft, false, MatrixShape>::run(dst, lhs, rhs);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Lhs, Rhs, MatrixShape, TranspositionsShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Rhs& rhs) {
+    transposition_matrix_product<Lhs, OnTheRight, false, MatrixShape>::run(dst, rhs, lhs);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Transpose<Lhs>, Rhs, TranspositionsShape, MatrixShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Transpose<Lhs>& lhs, const Rhs& rhs) {
+    transposition_matrix_product<Rhs, OnTheLeft, true, MatrixShape>::run(dst, lhs.nestedExpression(), rhs);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Lhs, Transpose<Rhs>, MatrixShape, TranspositionsShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Transpose<Rhs>& rhs) {
+    transposition_matrix_product<Lhs, OnTheRight, true, MatrixShape>::run(dst, rhs.nestedExpression(), lhs);
+  }
+};
+
+/***************************************************************************
+ * skew symmetric products
+ * for now we just call the generic implementation
+ ***************************************************************************/
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Lhs, Rhs, SkewSymmetricShape, MatrixShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Rhs& rhs) {
+    generic_product_impl<typename Lhs::DenseMatrixType, Rhs, DenseShape, MatrixShape, ProductTag>::evalTo(dst, lhs,
+                                                                                                          rhs);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag, typename MatrixShape>
+struct generic_product_impl<Lhs, Rhs, MatrixShape, SkewSymmetricShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Rhs& rhs) {
+    generic_product_impl<Lhs, typename Rhs::DenseMatrixType, MatrixShape, DenseShape, ProductTag>::evalTo(dst, lhs,
+                                                                                                          rhs);
+  }
+};
+
+template <typename Lhs, typename Rhs, int ProductTag>
+struct generic_product_impl<Lhs, Rhs, SkewSymmetricShape, SkewSymmetricShape, ProductTag> {
+  template <typename Dest>
+  static EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void evalTo(Dest& dst, const Lhs& lhs, const Rhs& rhs) {
+    generic_product_impl<typename Lhs::DenseMatrixType, typename Rhs::DenseMatrixType, DenseShape, DenseShape,
+                         ProductTag>::evalTo(dst, lhs, rhs);
+  }
+};
+
+}  // end namespace internal
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_PRODUCT_EVALUATORS_H

eigen-master/Eigen/src/Core/Random.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_RANDOM_H
+#define EIGEN_RANDOM_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+template <typename Scalar>
+struct scalar_random_op {
+  inline const Scalar operator()() const { return random<Scalar>(); }
+};
+
+template <typename Scalar>
+struct functor_traits<scalar_random_op<Scalar> > {
+  enum { Cost = 5 * NumTraits<Scalar>::MulCost, PacketAccess = false, IsRepeatable = false };
+};
+
+}  // end namespace internal
+
+/** \returns a random matrix expression
+ *
+ * Numbers are uniformly spread through their whole definition range for integer types,
+ * and in the [-1:1] range for floating point scalar types.
+ *
+ * The parameters \a rows and \a cols are the number of rows and of columns of
+ * the returned matrix. Must be compatible with this MatrixBase type.
+ *
+ * \not_reentrant
+ *
+ * This variant is meant to be used for dynamic-size matrix types. For fixed-size types,
+ * it is redundant to pass \a rows and \a cols as arguments, so Random() should be used
+ * instead.
+ *
+ *
+ * Example: \include MatrixBase_random_int_int.cpp
+ * Output: \verbinclude MatrixBase_random_int_int.out
+ *
+ * This expression has the "evaluate before nesting" flag so that it will be evaluated into
+ * a temporary matrix whenever it is nested in a larger expression. This prevents unexpected
+ * behavior with expressions involving random matrices.
+ *
+ * See DenseBase::NullaryExpr(Index, const CustomNullaryOp&) for an example using C++11 random generators.
+ *
+ * \sa DenseBase::setRandom(), DenseBase::Random(Index), DenseBase::Random()
+ */
+template <typename Derived>
+inline const typename DenseBase<Derived>::RandomReturnType DenseBase<Derived>::Random(Index rows, Index cols) {
+  return NullaryExpr(rows, cols, internal::scalar_random_op<Scalar>());
+}
+
+/** \returns a random vector expression
+ *
+ * Numbers are uniformly spread through their whole definition range for integer types,
+ * and in the [-1:1] range for floating point scalar types.
+ *
+ * The parameter \a size is the size of the returned vector.
+ * Must be compatible with this MatrixBase type.
+ *
+ * \only_for_vectors
+ * \not_reentrant
+ *
+ * This variant is meant to be used for dynamic-size vector types. For fixed-size types,
+ * it is redundant to pass \a size as argument, so Random() should be used
+ * instead.
+ *
+ * Example: \include MatrixBase_random_int.cpp
+ * Output: \verbinclude MatrixBase_random_int.out
+ *
+ * This expression has the "evaluate before nesting" flag so that it will be evaluated into
+ * a temporary vector whenever it is nested in a larger expression. This prevents unexpected
+ * behavior with expressions involving random matrices.
+ *
+ * \sa DenseBase::setRandom(), DenseBase::Random(Index,Index), DenseBase::Random()
+ */
+template <typename Derived>
+inline const typename DenseBase<Derived>::RandomReturnType DenseBase<Derived>::Random(Index size) {
+  return NullaryExpr(size, internal::scalar_random_op<Scalar>());
+}
+
+/** \returns a fixed-size random matrix or vector expression
+ *
+ * Numbers are uniformly spread through their whole definition range for integer types,
+ * and in the [-1:1] range for floating point scalar types.
+ *
+ * This variant is only for fixed-size MatrixBase types. For dynamic-size types, you
+ * need to use the variants taking size arguments.
+ *
+ * Example: \include MatrixBase_random.cpp
+ * Output: \verbinclude MatrixBase_random.out
+ *
+ * This expression has the "evaluate before nesting" flag so that it will be evaluated into
+ * a temporary matrix whenever it is nested in a larger expression. This prevents unexpected
+ * behavior with expressions involving random matrices.
+ *
+ * \not_reentrant
+ *
+ * \sa DenseBase::setRandom(), DenseBase::Random(Index,Index), DenseBase::Random(Index)
+ */
+template <typename Derived>
+inline const typename DenseBase<Derived>::RandomReturnType DenseBase<Derived>::Random() {
+  return NullaryExpr(RowsAtCompileTime, ColsAtCompileTime, internal::scalar_random_op<Scalar>());
+}
+
+/** Sets all coefficients in this expression to random values.
+ *
+ * Numbers are uniformly spread through their whole definition range for integer types,
+ * and in the [-1:1] range for floating point scalar types.
+ *
+ * \not_reentrant
+ *
+ * Example: \include MatrixBase_setRandom.cpp
+ * Output: \verbinclude MatrixBase_setRandom.out
+ *
+ * \sa class CwiseNullaryOp, setRandom(Index), setRandom(Index,Index)
+ */
+template <typename Derived>
+EIGEN_DEVICE_FUNC inline Derived& DenseBase<Derived>::setRandom() {
+  return *this = Random(rows(), cols());
+}
+
+/** Resizes to the given \a newSize, and sets all coefficients in this expression to random values.
+ *
+ * Numbers are uniformly spread through their whole definition range for integer types,
+ * and in the [-1:1] range for floating point scalar types.
+ *
+ * \only_for_vectors
+ * \not_reentrant
+ *
+ * Example: \include Matrix_setRandom_int.cpp
+ * Output: \verbinclude Matrix_setRandom_int.out
+ *
+ * \sa DenseBase::setRandom(), setRandom(Index,Index), class CwiseNullaryOp, DenseBase::Random()
+ */
+template <typename Derived>
+EIGEN_STRONG_INLINE Derived& PlainObjectBase<Derived>::setRandom(Index newSize) {
+  resize(newSize);
+  return setRandom();
+}
+
+/** Resizes to the given size, and sets all coefficients in this expression to random values.
+ *
+ * Numbers are uniformly spread through their whole definition range for integer types,
+ * and in the [-1:1] range for floating point scalar types.
+ *
+ * \not_reentrant
+ *
+ * \param rows the new number of rows
+ * \param cols the new number of columns
+ *
+ * Example: \include Matrix_setRandom_int_int.cpp
+ * Output: \verbinclude Matrix_setRandom_int_int.out
+ *
+ * \sa DenseBase::setRandom(), setRandom(Index), class CwiseNullaryOp, DenseBase::Random()
+ */
+template <typename Derived>
+EIGEN_STRONG_INLINE Derived& PlainObjectBase<Derived>::setRandom(Index rows, Index cols) {
+  resize(rows, cols);
+  return setRandom();
+}
+
+/** Resizes to the given size, changing only the number of columns, and sets all
+ * coefficients in this expression to random values. For the parameter of type
+ * NoChange_t, just pass the special value \c NoChange.
+ *
+ * Numbers are uniformly spread through their whole definition range for integer types,
+ * and in the [-1:1] range for floating point scalar types.
+ *
+ * \not_reentrant
+ *
+ * \sa DenseBase::setRandom(), setRandom(Index), setRandom(Index, NoChange_t), class CwiseNullaryOp, DenseBase::Random()
+ */
+template <typename Derived>
+EIGEN_STRONG_INLINE Derived& PlainObjectBase<Derived>::setRandom(NoChange_t, Index cols) {
+  return setRandom(rows(), cols);
+}
+
+/** Resizes to the given size, changing only the number of rows, and sets all
+ * coefficients in this expression to random values. For the parameter of type
+ * NoChange_t, just pass the special value \c NoChange.
+ *
+ * Numbers are uniformly spread through their whole definition range for integer types,
+ * and in the [-1:1] range for floating point scalar types.
+ *
+ * \not_reentrant
+ *
+ * \sa DenseBase::setRandom(), setRandom(Index), setRandom(NoChange_t, Index), class CwiseNullaryOp, DenseBase::Random()
+ */
+template <typename Derived>
+EIGEN_STRONG_INLINE Derived& PlainObjectBase<Derived>::setRandom(Index rows, NoChange_t) {
+  return setRandom(rows, cols());
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_RANDOM_H

eigen-master/Eigen/src/Core/RandomImpl.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2024 Charles Schlosser <cs.schlosser@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_RANDOM_IMPL_H
+#define EIGEN_RANDOM_IMPL_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+/****************************************************************************
+ * Implementation of random                                               *
+ ****************************************************************************/
+
+template <typename Scalar, bool IsComplex, bool IsInteger>
+struct random_default_impl {};
+
+template <typename Scalar>
+struct random_impl : random_default_impl<Scalar, NumTraits<Scalar>::IsComplex, NumTraits<Scalar>::IsInteger> {};
+
+template <typename Scalar>
+struct random_retval {
+  typedef Scalar type;
+};
+
+template <typename Scalar>
+inline EIGEN_MATHFUNC_RETVAL(random, Scalar) random(const Scalar& x, const Scalar& y) {
+  return EIGEN_MATHFUNC_IMPL(random, Scalar)::run(x, y);
+}
+
+template <typename Scalar>
+inline EIGEN_MATHFUNC_RETVAL(random, Scalar) random() {
+  return EIGEN_MATHFUNC_IMPL(random, Scalar)::run();
+}
+
+// TODO: replace or provide alternatives to this, e.g. std::random_device
+struct eigen_random_device {
+  using ReturnType = int;
+  static constexpr int Entropy = meta_floor_log2<(unsigned int)(RAND_MAX) + 1>::value;
+  static constexpr ReturnType Highest = RAND_MAX;
+  static EIGEN_DEVICE_FUNC inline ReturnType run() { return std::rand(); }
+};
+
+// Fill a built-in unsigned integer with numRandomBits beginning with the least significant bit
+template <typename Scalar>
+struct random_bits_impl {
+  EIGEN_STATIC_ASSERT(std::is_unsigned<Scalar>::value, SCALAR MUST BE A BUILT - IN UNSIGNED INTEGER)
+  using RandomDevice = eigen_random_device;
+  using RandomReturnType = typename RandomDevice::ReturnType;
+  static constexpr int kEntropy = RandomDevice::Entropy;
+  static constexpr int kTotalBits = sizeof(Scalar) * CHAR_BIT;
+  // return a Scalar filled with numRandomBits beginning from the least significant bit
+  static EIGEN_DEVICE_FUNC inline Scalar run(int numRandomBits) {
+    eigen_assert((numRandomBits >= 0) && (numRandomBits <= kTotalBits));
+    const Scalar mask = Scalar(-1) >> ((kTotalBits - numRandomBits) & (kTotalBits - 1));
+    Scalar randomBits = 0;
+    for (int shift = 0; shift < numRandomBits; shift += kEntropy) {
+      RandomReturnType r = RandomDevice::run();
+      randomBits |= static_cast<Scalar>(r) << shift;
+    }
+    // clear the excess bits
+    randomBits &= mask;
+    return randomBits;
+  }
+};
+
+template <typename BitsType>
+EIGEN_DEVICE_FUNC inline BitsType getRandomBits(int numRandomBits) {
+  return random_bits_impl<BitsType>::run(numRandomBits);
+}
+
+// random implementation for a built-in floating point type
+template <typename Scalar, bool BuiltIn = std::is_floating_point<Scalar>::value>
+struct random_float_impl {
+  using BitsType = typename numext::get_integer_by_size<sizeof(Scalar)>::unsigned_type;
+  static constexpr EIGEN_DEVICE_FUNC inline int mantissaBits() {
+    const int digits = NumTraits<Scalar>::digits();
+    return digits - 1;
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run(int numRandomBits) {
+    eigen_assert(numRandomBits >= 0 && numRandomBits <= mantissaBits());
+    BitsType randomBits = getRandomBits<BitsType>(numRandomBits);
+    // if fewer than MantissaBits is requested, shift them to the left
+    randomBits <<= (mantissaBits() - numRandomBits);
+    // randomBits is in the half-open interval [2,4)
+    randomBits |= numext::bit_cast<BitsType>(Scalar(2));
+    // result is in the half-open interval [-1,1)
+    Scalar result = numext::bit_cast<Scalar>(randomBits) - Scalar(3);
+    return result;
+  }
+};
+// random implementation for a custom floating point type
+// uses double as the implementation with a mantissa with a size equal to either the target scalar's mantissa or that of
+// double, whichever is smaller
+template <typename Scalar>
+struct random_float_impl<Scalar, false> {
+  static EIGEN_DEVICE_FUNC inline int mantissaBits() {
+    const int digits = NumTraits<Scalar>::digits();
+    constexpr int kDoubleDigits = NumTraits<double>::digits();
+    return numext::mini(digits, kDoubleDigits) - 1;
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run(int numRandomBits) {
+    eigen_assert(numRandomBits >= 0 && numRandomBits <= mantissaBits());
+    Scalar result = static_cast<Scalar>(random_float_impl<double>::run(numRandomBits));
+    return result;
+  }
+};
+
+#if !EIGEN_COMP_NVCC
+// random implementation for long double
+// this specialization is not compatible with double-double scalars
+template <bool Specialize = (sizeof(long double) == 2 * sizeof(uint64_t)) &&
+                            ((std::numeric_limits<long double>::digits != (2 * std::numeric_limits<double>::digits)))>
+struct random_longdouble_impl {
+  static constexpr int Size = sizeof(long double);
+  static constexpr EIGEN_DEVICE_FUNC int mantissaBits() { return NumTraits<long double>::digits() - 1; }
+  static EIGEN_DEVICE_FUNC inline long double run(int numRandomBits) {
+    eigen_assert(numRandomBits >= 0 && numRandomBits <= mantissaBits());
+    EIGEN_USING_STD(memcpy);
+    int numLowBits = numext::mini(numRandomBits, 64);
+    int numHighBits = numext::maxi(numRandomBits - 64, 0);
+    uint64_t randomBits[2];
+    long double result = 2.0L;
+    memcpy(&randomBits, &result, Size);
+    randomBits[0] |= getRandomBits<uint64_t>(numLowBits);
+    randomBits[1] |= getRandomBits<uint64_t>(numHighBits);
+    memcpy(&result, &randomBits, Size);
+    result -= 3.0L;
+    return result;
+  }
+};
+template <>
+struct random_longdouble_impl<false> {
+  static constexpr EIGEN_DEVICE_FUNC int mantissaBits() { return NumTraits<double>::digits() - 1; }
+  static EIGEN_DEVICE_FUNC inline long double run(int numRandomBits) {
+    return static_cast<long double>(random_float_impl<double>::run(numRandomBits));
+  }
+};
+template <>
+struct random_float_impl<long double> : random_longdouble_impl<> {};
+#endif
+
+template <typename Scalar>
+struct random_default_impl<Scalar, false, false> {
+  using Impl = random_float_impl<Scalar>;
+  static EIGEN_DEVICE_FUNC inline Scalar run(const Scalar& x, const Scalar& y, int numRandomBits) {
+    Scalar half_x = Scalar(0.5) * x;
+    Scalar half_y = Scalar(0.5) * y;
+    Scalar result = (half_x + half_y) + (half_y - half_x) * run(numRandomBits);
+    // result is in the half-open interval [x, y) -- provided that x < y
+    return result;
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run(const Scalar& x, const Scalar& y) {
+    return run(x, y, Impl::mantissaBits());
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run(int numRandomBits) { return Impl::run(numRandomBits); }
+  static EIGEN_DEVICE_FUNC inline Scalar run() { return run(Impl::mantissaBits()); }
+};
+
+template <typename Scalar, bool IsSigned = NumTraits<Scalar>::IsSigned, bool BuiltIn = std::is_integral<Scalar>::value>
+struct random_int_impl;
+
+// random implementation for a built-in unsigned integer type
+template <typename Scalar>
+struct random_int_impl<Scalar, false, true> {
+  static constexpr int kTotalBits = sizeof(Scalar) * CHAR_BIT;
+  static EIGEN_DEVICE_FUNC inline Scalar run(const Scalar& x, const Scalar& y) {
+    if (y <= x) return x;
+    Scalar range = y - x;
+    // handle edge case where [x,y] spans the entire range of Scalar
+    if (range == NumTraits<Scalar>::highest()) return run();
+    Scalar count = range + 1;
+    // calculate the number of random bits needed to fill range
+    int numRandomBits = log2_ceil(count);
+    Scalar randomBits;
+    do {
+      randomBits = getRandomBits<Scalar>(numRandomBits);
+      // if the random draw is outside [0, range), try again (rejection sampling)
+      // in the worst-case scenario, the probability of rejection is: 1/2 - 1/2^numRandomBits < 50%
+    } while (randomBits >= count);
+    Scalar result = x + randomBits;
+    return result;
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run() { return getRandomBits<Scalar>(kTotalBits); }
+};
+
+// random implementation for a built-in signed integer type
+template <typename Scalar>
+struct random_int_impl<Scalar, true, true> {
+  static constexpr int kTotalBits = sizeof(Scalar) * CHAR_BIT;
+  using BitsType = typename make_unsigned<Scalar>::type;
+  static EIGEN_DEVICE_FUNC inline Scalar run(const Scalar& x, const Scalar& y) {
+    if (y <= x) return x;
+    // Avoid overflow by representing `range` as an unsigned type
+    BitsType range = static_cast<BitsType>(y) - static_cast<BitsType>(x);
+    BitsType randomBits = random_int_impl<BitsType>::run(0, range);
+    // Avoid overflow in the case where `x` is negative and there is a large range so
+    // `randomBits` would also be negative if cast to `Scalar` first.
+    Scalar result = static_cast<Scalar>(static_cast<BitsType>(x) + randomBits);
+    return result;
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run() { return static_cast<Scalar>(getRandomBits<BitsType>(kTotalBits)); }
+};
+
+// todo: custom integers
+template <typename Scalar, bool IsSigned>
+struct random_int_impl<Scalar, IsSigned, false> {
+  static EIGEN_DEVICE_FUNC inline Scalar run(const Scalar&, const Scalar&) { return run(); }
+  static EIGEN_DEVICE_FUNC inline Scalar run() {
+    eigen_assert(std::false_type::value && "RANDOM FOR CUSTOM INTEGERS NOT YET SUPPORTED");
+    return Scalar(0);
+  }
+};
+
+template <typename Scalar>
+struct random_default_impl<Scalar, false, true> : random_int_impl<Scalar> {};
+
+template <>
+struct random_impl<bool> {
+  static EIGEN_DEVICE_FUNC inline bool run(const bool& x, const bool& y) {
+    if (y <= x) return x;
+    return run();
+  }
+  static EIGEN_DEVICE_FUNC inline bool run() { return getRandomBits<unsigned>(1) ? true : false; }
+};
+
+template <typename Scalar>
+struct random_default_impl<Scalar, true, false> {
+  typedef typename NumTraits<Scalar>::Real RealScalar;
+  using Impl = random_impl<RealScalar>;
+  static EIGEN_DEVICE_FUNC inline Scalar run(const Scalar& x, const Scalar& y, int numRandomBits) {
+    return Scalar(Impl::run(x.real(), y.real(), numRandomBits), Impl::run(x.imag(), y.imag(), numRandomBits));
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run(const Scalar& x, const Scalar& y) {
+    return Scalar(Impl::run(x.real(), y.real()), Impl::run(x.imag(), y.imag()));
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run(int numRandomBits) {
+    return Scalar(Impl::run(numRandomBits), Impl::run(numRandomBits));
+  }
+  static EIGEN_DEVICE_FUNC inline Scalar run() { return Scalar(Impl::run(), Impl::run()); }
+};
+
+}  // namespace internal
+}  // namespace Eigen
+
+#endif  // EIGEN_RANDOM_IMPL_H

eigen-master/Eigen/src/Core/Redux.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
+// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_REDUX_H
+#define EIGEN_REDUX_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+// TODO
+//  * implement other kind of vectorization
+//  * factorize code
+
+/***************************************************************************
+ * Part 1 : the logic deciding a strategy for vectorization and unrolling
+ ***************************************************************************/
+
+template <typename Func, typename Evaluator>
+struct redux_traits {
+ public:
+  typedef typename find_best_packet<typename Evaluator::Scalar, Evaluator::SizeAtCompileTime>::type PacketType;
+  enum {
+    PacketSize = unpacket_traits<PacketType>::size,
+    InnerMaxSize = int(Evaluator::IsRowMajor) ? Evaluator::MaxColsAtCompileTime : Evaluator::MaxRowsAtCompileTime,
+    OuterMaxSize = int(Evaluator::IsRowMajor) ? Evaluator::MaxRowsAtCompileTime : Evaluator::MaxColsAtCompileTime,
+    SliceVectorizedWork = int(InnerMaxSize) == Dynamic   ? Dynamic
+                          : int(OuterMaxSize) == Dynamic ? (int(InnerMaxSize) >= int(PacketSize) ? Dynamic : 0)
+                                                         : (int(InnerMaxSize) / int(PacketSize)) * int(OuterMaxSize)
+  };
+
+  enum {
+    MayLinearize = (int(Evaluator::Flags) & LinearAccessBit),
+    MightVectorize = (int(Evaluator::Flags) & ActualPacketAccessBit) && (functor_traits<Func>::PacketAccess),
+    MayLinearVectorize = bool(MightVectorize) && bool(MayLinearize),
+    MaySliceVectorize = bool(MightVectorize) && (int(SliceVectorizedWork) == Dynamic || int(SliceVectorizedWork) >= 3)
+  };
+
+ public:
+  enum {
+    Traversal = int(MayLinearVectorize)  ? int(LinearVectorizedTraversal)
+                : int(MaySliceVectorize) ? int(SliceVectorizedTraversal)
+                : int(MayLinearize)      ? int(LinearTraversal)
+                                         : int(DefaultTraversal)
+  };
+
+ public:
+  enum {
+    Cost = Evaluator::SizeAtCompileTime == Dynamic
+               ? HugeCost
+               : int(Evaluator::SizeAtCompileTime) * int(Evaluator::CoeffReadCost) +
+                     (Evaluator::SizeAtCompileTime - 1) * functor_traits<Func>::Cost,
+    UnrollingLimit = EIGEN_UNROLLING_LIMIT * (int(Traversal) == int(DefaultTraversal) ? 1 : int(PacketSize))
+  };
+
+ public:
+  enum { Unrolling = Cost <= UnrollingLimit ? CompleteUnrolling : NoUnrolling };
+
+#ifdef EIGEN_DEBUG_ASSIGN
+  static void debug() {
+    std::cerr << "Xpr: " << typeid(typename Evaluator::XprType).name() << std::endl;
+    std::cerr.setf(std::ios::hex, std::ios::basefield);
+    EIGEN_DEBUG_VAR(Evaluator::Flags)
+    std::cerr.unsetf(std::ios::hex);
+    EIGEN_DEBUG_VAR(InnerMaxSize)
+    EIGEN_DEBUG_VAR(OuterMaxSize)
+    EIGEN_DEBUG_VAR(SliceVectorizedWork)
+    EIGEN_DEBUG_VAR(PacketSize)
+    EIGEN_DEBUG_VAR(MightVectorize)
+    EIGEN_DEBUG_VAR(MayLinearVectorize)
+    EIGEN_DEBUG_VAR(MaySliceVectorize)
+    std::cerr << "Traversal"
+              << " = " << Traversal << " (" << demangle_traversal(Traversal) << ")" << std::endl;
+    EIGEN_DEBUG_VAR(UnrollingLimit)
+    std::cerr << "Unrolling"
+              << " = " << Unrolling << " (" << demangle_unrolling(Unrolling) << ")" << std::endl;
+    std::cerr << std::endl;
+  }
+#endif
+};
+
+/***************************************************************************
+ * Part 2 : unrollers
+ ***************************************************************************/
+
+/*** no vectorization ***/
+
+template <typename Func, typename Evaluator, Index Start, Index Length>
+struct redux_novec_unroller {
+  static constexpr Index HalfLength = Length / 2;
+
+  typedef typename Evaluator::Scalar Scalar;
+
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func& func) {
+    return func(redux_novec_unroller<Func, Evaluator, Start, HalfLength>::run(eval, func),
+                redux_novec_unroller<Func, Evaluator, Start + HalfLength, Length - HalfLength>::run(eval, func));
+  }
+};
+
+template <typename Func, typename Evaluator, Index Start>
+struct redux_novec_unroller<Func, Evaluator, Start, 1> {
+  static constexpr Index outer = Start / Evaluator::InnerSizeAtCompileTime;
+  static constexpr Index inner = Start % Evaluator::InnerSizeAtCompileTime;
+
+  typedef typename Evaluator::Scalar Scalar;
+
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func&) {
+    return eval.coeffByOuterInner(outer, inner);
+  }
+};
+
+// This is actually dead code and will never be called. It is required
+// to prevent false warnings regarding failed inlining though
+// for 0 length run() will never be called at all.
+template <typename Func, typename Evaluator, Index Start>
+struct redux_novec_unroller<Func, Evaluator, Start, 0> {
+  typedef typename Evaluator::Scalar Scalar;
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator&, const Func&) { return Scalar(); }
+};
+
+template <typename Func, typename Evaluator, Index Start, Index Length>
+struct redux_novec_linear_unroller {
+  static constexpr Index HalfLength = Length / 2;
+
+  typedef typename Evaluator::Scalar Scalar;
+
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func& func) {
+    return func(redux_novec_linear_unroller<Func, Evaluator, Start, HalfLength>::run(eval, func),
+                redux_novec_linear_unroller<Func, Evaluator, Start + HalfLength, Length - HalfLength>::run(eval, func));
+  }
+};
+
+template <typename Func, typename Evaluator, Index Start>
+struct redux_novec_linear_unroller<Func, Evaluator, Start, 1> {
+  typedef typename Evaluator::Scalar Scalar;
+
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func&) {
+    return eval.coeff(Start);
+  }
+};
+
+// This is actually dead code and will never be called. It is required
+// to prevent false warnings regarding failed inlining though
+// for 0 length run() will never be called at all.
+template <typename Func, typename Evaluator, Index Start>
+struct redux_novec_linear_unroller<Func, Evaluator, Start, 0> {
+  typedef typename Evaluator::Scalar Scalar;
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator&, const Func&) { return Scalar(); }
+};
+
+/*** vectorization ***/
+
+template <typename Func, typename Evaluator, Index Start, Index Length>
+struct redux_vec_unroller {
+  template <typename PacketType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE PacketType run(const Evaluator& eval, const Func& func) {
+    constexpr Index HalfLength = Length / 2;
+
+    return func.packetOp(
+        redux_vec_unroller<Func, Evaluator, Start, HalfLength>::template run<PacketType>(eval, func),
+        redux_vec_unroller<Func, Evaluator, Start + HalfLength, Length - HalfLength>::template run<PacketType>(eval,
+                                                                                                               func));
+  }
+};
+
+template <typename Func, typename Evaluator, Index Start>
+struct redux_vec_unroller<Func, Evaluator, Start, 1> {
+  template <typename PacketType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE PacketType run(const Evaluator& eval, const Func&) {
+    constexpr Index PacketSize = unpacket_traits<PacketType>::size;
+    constexpr Index index = Start * PacketSize;
+    constexpr Index outer = index / int(Evaluator::InnerSizeAtCompileTime);
+    constexpr Index inner = index % int(Evaluator::InnerSizeAtCompileTime);
+    constexpr int alignment = Evaluator::Alignment;
+
+    return eval.template packetByOuterInner<alignment, PacketType>(outer, inner);
+  }
+};
+
+template <typename Func, typename Evaluator, Index Start, Index Length>
+struct redux_vec_linear_unroller {
+  template <typename PacketType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE PacketType run(const Evaluator& eval, const Func& func) {
+    constexpr Index HalfLength = Length / 2;
+
+    return func.packetOp(
+        redux_vec_linear_unroller<Func, Evaluator, Start, HalfLength>::template run<PacketType>(eval, func),
+        redux_vec_linear_unroller<Func, Evaluator, Start + HalfLength, Length - HalfLength>::template run<PacketType>(
+            eval, func));
+  }
+};
+
+template <typename Func, typename Evaluator, Index Start>
+struct redux_vec_linear_unroller<Func, Evaluator, Start, 1> {
+  template <typename PacketType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE PacketType run(const Evaluator& eval, const Func&) {
+    constexpr Index PacketSize = unpacket_traits<PacketType>::size;
+    constexpr Index index = (Start * PacketSize);
+    constexpr int alignment = Evaluator::Alignment;
+    return eval.template packet<alignment, PacketType>(index);
+  }
+};
+
+/***************************************************************************
+ * Part 3 : implementation of all cases
+ ***************************************************************************/
+
+template <typename Func, typename Evaluator, int Traversal = redux_traits<Func, Evaluator>::Traversal,
+          int Unrolling = redux_traits<Func, Evaluator>::Unrolling>
+struct redux_impl;
+
+template <typename Func, typename Evaluator>
+struct redux_impl<Func, Evaluator, DefaultTraversal, NoUnrolling> {
+  typedef typename Evaluator::Scalar Scalar;
+
+  template <typename XprType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func& func, const XprType& xpr) {
+    eigen_assert(xpr.rows() > 0 && xpr.cols() > 0 && "you are using an empty matrix");
+    Scalar res = eval.coeffByOuterInner(0, 0);
+    for (Index i = 1; i < xpr.innerSize(); ++i) res = func(res, eval.coeffByOuterInner(0, i));
+    for (Index i = 1; i < xpr.outerSize(); ++i)
+      for (Index j = 0; j < xpr.innerSize(); ++j) res = func(res, eval.coeffByOuterInner(i, j));
+    return res;
+  }
+};
+
+template <typename Func, typename Evaluator>
+struct redux_impl<Func, Evaluator, LinearTraversal, NoUnrolling> {
+  typedef typename Evaluator::Scalar Scalar;
+
+  template <typename XprType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func& func, const XprType& xpr) {
+    eigen_assert(xpr.size() > 0 && "you are using an empty matrix");
+    Scalar res = eval.coeff(0);
+    for (Index k = 1; k < xpr.size(); ++k) res = func(res, eval.coeff(k));
+    return res;
+  }
+};
+
+template <typename Func, typename Evaluator>
+struct redux_impl<Func, Evaluator, DefaultTraversal, CompleteUnrolling>
+    : redux_novec_unroller<Func, Evaluator, 0, Evaluator::SizeAtCompileTime> {
+  typedef redux_novec_unroller<Func, Evaluator, 0, Evaluator::SizeAtCompileTime> Base;
+  typedef typename Evaluator::Scalar Scalar;
+  template <typename XprType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func& func,
+                                                          const XprType& /*xpr*/) {
+    return Base::run(eval, func);
+  }
+};
+
+template <typename Func, typename Evaluator>
+struct redux_impl<Func, Evaluator, LinearTraversal, CompleteUnrolling>
+    : redux_novec_linear_unroller<Func, Evaluator, 0, Evaluator::SizeAtCompileTime> {
+  typedef redux_novec_linear_unroller<Func, Evaluator, 0, Evaluator::SizeAtCompileTime> Base;
+  typedef typename Evaluator::Scalar Scalar;
+  template <typename XprType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func& func,
+                                                          const XprType& /*xpr*/) {
+    return Base::run(eval, func);
+  }
+};
+
+template <typename Func, typename Evaluator>
+struct redux_impl<Func, Evaluator, LinearVectorizedTraversal, NoUnrolling> {
+  typedef typename Evaluator::Scalar Scalar;
+  typedef typename redux_traits<Func, Evaluator>::PacketType PacketScalar;
+
+  template <typename XprType>
+  static Scalar run(const Evaluator& eval, const Func& func, const XprType& xpr) {
+    const Index size = xpr.size();
+
+    constexpr Index packetSize = redux_traits<Func, Evaluator>::PacketSize;
+    constexpr int packetAlignment = unpacket_traits<PacketScalar>::alignment;
+    constexpr int alignment0 =
+        (bool(Evaluator::Flags & DirectAccessBit) && bool(packet_traits<Scalar>::AlignedOnScalar))
+            ? int(packetAlignment)
+            : int(Unaligned);
+    constexpr int alignment = plain_enum_max(alignment0, Evaluator::Alignment);
+    const Index alignedStart = internal::first_default_aligned(xpr);
+    const Index alignedSize2 = ((size - alignedStart) / (2 * packetSize)) * (2 * packetSize);
+    const Index alignedSize = ((size - alignedStart) / (packetSize)) * (packetSize);
+    const Index alignedEnd2 = alignedStart + alignedSize2;
+    const Index alignedEnd = alignedStart + alignedSize;
+    Scalar res;
+    if (alignedSize) {
+      PacketScalar packet_res0 = eval.template packet<alignment, PacketScalar>(alignedStart);
+      if (alignedSize > packetSize)  // we have at least two packets to partly unroll the loop
+      {
+        PacketScalar packet_res1 = eval.template packet<alignment, PacketScalar>(alignedStart + packetSize);
+        for (Index index = alignedStart + 2 * packetSize; index < alignedEnd2; index += 2 * packetSize) {
+          packet_res0 = func.packetOp(packet_res0, eval.template packet<alignment, PacketScalar>(index));
+          packet_res1 = func.packetOp(packet_res1, eval.template packet<alignment, PacketScalar>(index + packetSize));
+        }
+
+        packet_res0 = func.packetOp(packet_res0, packet_res1);
+        if (alignedEnd > alignedEnd2)
+          packet_res0 = func.packetOp(packet_res0, eval.template packet<alignment, PacketScalar>(alignedEnd2));
+      }
+      res = func.predux(packet_res0);
+
+      for (Index index = 0; index < alignedStart; ++index) res = func(res, eval.coeff(index));
+
+      for (Index index = alignedEnd; index < size; ++index) res = func(res, eval.coeff(index));
+    } else  // too small to vectorize anything.
+            // since this is dynamic-size hence inefficient anyway for such small sizes, don't try to optimize.
+    {
+      res = eval.coeff(0);
+      for (Index index = 1; index < size; ++index) res = func(res, eval.coeff(index));
+    }
+
+    return res;
+  }
+};
+
+// NOTE: for SliceVectorizedTraversal we simply bypass unrolling
+template <typename Func, typename Evaluator, int Unrolling>
+struct redux_impl<Func, Evaluator, SliceVectorizedTraversal, Unrolling> {
+  typedef typename Evaluator::Scalar Scalar;
+  typedef typename redux_traits<Func, Evaluator>::PacketType PacketType;
+
+  template <typename XprType>
+  EIGEN_DEVICE_FUNC static Scalar run(const Evaluator& eval, const Func& func, const XprType& xpr) {
+    eigen_assert(xpr.rows() > 0 && xpr.cols() > 0 && "you are using an empty matrix");
+    constexpr Index packetSize = redux_traits<Func, Evaluator>::PacketSize;
+    const Index innerSize = xpr.innerSize();
+    const Index outerSize = xpr.outerSize();
+    const Index packetedInnerSize = ((innerSize) / packetSize) * packetSize;
+    Scalar res;
+    if (packetedInnerSize) {
+      PacketType packet_res = eval.template packet<Unaligned, PacketType>(0, 0);
+      for (Index j = 0; j < outerSize; ++j)
+        for (Index i = (j == 0 ? packetSize : 0); i < packetedInnerSize; i += Index(packetSize))
+          packet_res = func.packetOp(packet_res, eval.template packetByOuterInner<Unaligned, PacketType>(j, i));
+
+      res = func.predux(packet_res);
+      for (Index j = 0; j < outerSize; ++j)
+        for (Index i = packetedInnerSize; i < innerSize; ++i) res = func(res, eval.coeffByOuterInner(j, i));
+    } else  // too small to vectorize anything.
+            // since this is dynamic-size hence inefficient anyway for such small sizes, don't try to optimize.
+    {
+      res = redux_impl<Func, Evaluator, DefaultTraversal, NoUnrolling>::run(eval, func, xpr);
+    }
+
+    return res;
+  }
+};
+
+template <typename Func, typename Evaluator>
+struct redux_impl<Func, Evaluator, LinearVectorizedTraversal, CompleteUnrolling> {
+  typedef typename Evaluator::Scalar Scalar;
+
+  typedef typename redux_traits<Func, Evaluator>::PacketType PacketType;
+  static constexpr Index PacketSize = redux_traits<Func, Evaluator>::PacketSize;
+  static constexpr Index Size = Evaluator::SizeAtCompileTime;
+  static constexpr Index VectorizedSize = (int(Size) / int(PacketSize)) * int(PacketSize);
+
+  template <typename XprType>
+  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE Scalar run(const Evaluator& eval, const Func& func, const XprType& xpr) {
+    EIGEN_ONLY_USED_FOR_DEBUG(xpr)
+    eigen_assert(xpr.rows() > 0 && xpr.cols() > 0 && "you are using an empty matrix");
+    if (VectorizedSize > 0) {
+      Scalar res = func.predux(
+          redux_vec_linear_unroller<Func, Evaluator, 0, Size / PacketSize>::template run<PacketType>(eval, func));
+      if (VectorizedSize != Size)
+        res = func(
+            res, redux_novec_linear_unroller<Func, Evaluator, VectorizedSize, Size - VectorizedSize>::run(eval, func));
+      return res;
+    } else {
+      return redux_novec_linear_unroller<Func, Evaluator, 0, Size>::run(eval, func);
+    }
+  }
+};
+
+// evaluator adaptor
+template <typename XprType_>
+class redux_evaluator : public internal::evaluator<XprType_> {
+  typedef internal::evaluator<XprType_> Base;
+
+ public:
+  typedef XprType_ XprType;
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit redux_evaluator(const XprType& xpr) : Base(xpr) {}
+
+  typedef typename XprType::Scalar Scalar;
+  typedef typename XprType::CoeffReturnType CoeffReturnType;
+  typedef typename XprType::PacketScalar PacketScalar;
+
+  enum {
+    MaxRowsAtCompileTime = XprType::MaxRowsAtCompileTime,
+    MaxColsAtCompileTime = XprType::MaxColsAtCompileTime,
+    // TODO we should not remove DirectAccessBit and rather find an elegant way to query the alignment offset at runtime
+    // from the evaluator
+    Flags = Base::Flags & ~DirectAccessBit,
+    IsRowMajor = XprType::IsRowMajor,
+    SizeAtCompileTime = XprType::SizeAtCompileTime,
+    InnerSizeAtCompileTime = XprType::InnerSizeAtCompileTime
+  };
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE CoeffReturnType coeffByOuterInner(Index outer, Index inner) const {
+    return Base::coeff(IsRowMajor ? outer : inner, IsRowMajor ? inner : outer);
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PacketType packetByOuterInner(Index outer, Index inner) const {
+    return Base::template packet<LoadMode, PacketType>(IsRowMajor ? outer : inner, IsRowMajor ? inner : outer);
+  }
+
+  template <int LoadMode, typename PacketType>
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE PacketType packetSegmentByOuterInner(Index outer, Index inner, Index begin,
+                                                                             Index count) const {
+    return Base::template packetSegment<LoadMode, PacketType>(IsRowMajor ? outer : inner, IsRowMajor ? inner : outer,
+                                                              begin, count);
+  }
+};
+
+}  // end namespace internal
+
+/***************************************************************************
+ * Part 4 : public API
+ ***************************************************************************/
+
+/** \returns the result of a full redux operation on the whole matrix or vector using \a func
+ *
+ * The template parameter \a BinaryOp is the type of the functor \a func which must be
+ * an associative operator. Both current C++98 and C++11 functor styles are handled.
+ *
+ * \warning the matrix must be not empty, otherwise an assertion is triggered.
+ *
+ * \sa DenseBase::sum(), DenseBase::minCoeff(), DenseBase::maxCoeff(), MatrixBase::colwise(), MatrixBase::rowwise()
+ */
+template <typename Derived>
+template <typename Func>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE typename internal::traits<Derived>::Scalar DenseBase<Derived>::redux(
+    const Func& func) const {
+  eigen_assert(this->rows() > 0 && this->cols() > 0 && "you are using an empty matrix");
+
+  typedef typename internal::redux_evaluator<Derived> ThisEvaluator;
+  ThisEvaluator thisEval(derived());
+
+  // The initial expression is passed to the reducer as an additional argument instead of
+  // passing it as a member of redux_evaluator to help
+  return internal::redux_impl<Func, ThisEvaluator>::run(thisEval, func, derived());
+}
+
+/** \returns the minimum of all coefficients of \c *this.
+ * In case \c *this contains NaN, NaNPropagation determines the behavior:
+ *   NaNPropagation == PropagateFast : undefined
+ *   NaNPropagation == PropagateNaN : result is NaN
+ *   NaNPropagation == PropagateNumbers : result is minimum of elements that are not NaN
+ * \warning the matrix must be not empty, otherwise an assertion is triggered.
+ */
+template <typename Derived>
+template <int NaNPropagation>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE typename internal::traits<Derived>::Scalar DenseBase<Derived>::minCoeff() const {
+  return derived().redux(Eigen::internal::scalar_min_op<Scalar, Scalar, NaNPropagation>());
+}
+
+/** \returns the maximum of all coefficients of \c *this.
+ * In case \c *this contains NaN, NaNPropagation determines the behavior:
+ *   NaNPropagation == PropagateFast : undefined
+ *   NaNPropagation == PropagateNaN : result is NaN
+ *   NaNPropagation == PropagateNumbers : result is maximum of elements that are not NaN
+ * \warning the matrix must be not empty, otherwise an assertion is triggered.
+ */
+template <typename Derived>
+template <int NaNPropagation>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE typename internal::traits<Derived>::Scalar DenseBase<Derived>::maxCoeff() const {
+  return derived().redux(Eigen::internal::scalar_max_op<Scalar, Scalar, NaNPropagation>());
+}
+
+/** \returns the sum of all coefficients of \c *this
+ *
+ * If \c *this is empty, then the value 0 is returned.
+ *
+ * \sa trace(), prod(), mean()
+ */
+template <typename Derived>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE typename internal::traits<Derived>::Scalar DenseBase<Derived>::sum() const {
+  if (SizeAtCompileTime == 0 || (SizeAtCompileTime == Dynamic && size() == 0)) return Scalar(0);
+  return derived().redux(Eigen::internal::scalar_sum_op<Scalar, Scalar>());
+}
+
+/** \returns the mean of all coefficients of *this
+ *
+ * \sa trace(), prod(), sum()
+ */
+template <typename Derived>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE typename internal::traits<Derived>::Scalar DenseBase<Derived>::mean() const {
+#ifdef __INTEL_COMPILER
+#pragma warning push
+#pragma warning(disable : 2259)
+#endif
+  return Scalar(derived().redux(Eigen::internal::scalar_sum_op<Scalar, Scalar>())) / Scalar(this->size());
+#ifdef __INTEL_COMPILER
+#pragma warning pop
+#endif
+}
+
+/** \returns the product of all coefficients of *this
+ *
+ * Example: \include MatrixBase_prod.cpp
+ * Output: \verbinclude MatrixBase_prod.out
+ *
+ * \sa sum(), mean(), trace()
+ */
+template <typename Derived>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE typename internal::traits<Derived>::Scalar DenseBase<Derived>::prod() const {
+  if (SizeAtCompileTime == 0 || (SizeAtCompileTime == Dynamic && size() == 0)) return Scalar(1);
+  return derived().redux(Eigen::internal::scalar_product_op<Scalar>());
+}
+
+/** \returns the trace of \c *this, i.e. the sum of the coefficients on the main diagonal.
+ *
+ * \c *this can be any matrix, not necessarily square.
+ *
+ * \sa diagonal(), sum()
+ */
+template <typename Derived>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE typename internal::traits<Derived>::Scalar MatrixBase<Derived>::trace() const {
+  return derived().diagonal().sum();
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_REDUX_H

eigen-master/Eigen/src/Core/Ref.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2012 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_REF_H
+#define EIGEN_REF_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+template <typename PlainObjectType_, int Options_, typename StrideType_>
+struct traits<Ref<PlainObjectType_, Options_, StrideType_> >
+    : public traits<Map<PlainObjectType_, Options_, StrideType_> > {
+  typedef PlainObjectType_ PlainObjectType;
+  typedef StrideType_ StrideType;
+  enum {
+    Options = Options_,
+    Flags = traits<Map<PlainObjectType_, Options_, StrideType_> >::Flags | NestByRefBit,
+    Alignment = traits<Map<PlainObjectType_, Options_, StrideType_> >::Alignment,
+    InnerStrideAtCompileTime = traits<Map<PlainObjectType_, Options_, StrideType_> >::InnerStrideAtCompileTime,
+    OuterStrideAtCompileTime = traits<Map<PlainObjectType_, Options_, StrideType_> >::OuterStrideAtCompileTime
+  };
+
+  template <typename Derived>
+  struct match {
+    enum {
+      IsVectorAtCompileTime = PlainObjectType::IsVectorAtCompileTime || Derived::IsVectorAtCompileTime,
+      HasDirectAccess = internal::has_direct_access<Derived>::ret,
+      StorageOrderMatch =
+          IsVectorAtCompileTime || ((PlainObjectType::Flags & RowMajorBit) == (Derived::Flags & RowMajorBit)),
+      InnerStrideMatch = int(InnerStrideAtCompileTime) == int(Dynamic) ||
+                         int(InnerStrideAtCompileTime) == int(Derived::InnerStrideAtCompileTime) ||
+                         (int(InnerStrideAtCompileTime) == 0 && int(Derived::InnerStrideAtCompileTime) == 1),
+      OuterStrideMatch = IsVectorAtCompileTime || int(OuterStrideAtCompileTime) == int(Dynamic) ||
+                         int(OuterStrideAtCompileTime) == int(Derived::OuterStrideAtCompileTime),
+      // NOTE, this indirection of evaluator<Derived>::Alignment is needed
+      // to workaround a very strange bug in MSVC related to the instantiation
+      // of has_*ary_operator in evaluator<CwiseNullaryOp>.
+      // This line is surprisingly very sensitive. For instance, simply adding parenthesis
+      // as "DerivedAlignment = (int(evaluator<Derived>::Alignment))," will make MSVC fail...
+      DerivedAlignment = int(evaluator<Derived>::Alignment),
+      AlignmentMatch = (int(traits<PlainObjectType>::Alignment) == int(Unaligned)) ||
+                       (DerivedAlignment >= int(Alignment)),  // FIXME the first condition is not very clear, it should
+                                                              // be replaced by the required alignment
+      ScalarTypeMatch = internal::is_same<typename PlainObjectType::Scalar, typename Derived::Scalar>::value,
+      MatchAtCompileTime = HasDirectAccess && StorageOrderMatch && InnerStrideMatch && OuterStrideMatch &&
+                           AlignmentMatch && ScalarTypeMatch
+    };
+    typedef std::conditional_t<MatchAtCompileTime, internal::true_type, internal::false_type> type;
+  };
+};
+
+template <typename Derived>
+struct traits<RefBase<Derived> > : public traits<Derived> {};
+
+}  // namespace internal
+
+template <typename Derived>
+class RefBase : public MapBase<Derived> {
+  typedef typename internal::traits<Derived>::PlainObjectType PlainObjectType;
+  typedef typename internal::traits<Derived>::StrideType StrideType;
+
+ public:
+  typedef MapBase<Derived> Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(RefBase)
+
+  EIGEN_DEVICE_FUNC constexpr Index innerStride() const {
+    return StrideType::InnerStrideAtCompileTime != 0 ? m_stride.inner() : 1;
+  }
+
+  EIGEN_DEVICE_FUNC constexpr Index outerStride() const {
+    return StrideType::OuterStrideAtCompileTime != 0 ? m_stride.outer()
+           : IsVectorAtCompileTime                   ? this->size()
+           : int(Flags) & RowMajorBit                ? this->cols()
+                                                     : this->rows();
+  }
+
+  EIGEN_DEVICE_FUNC RefBase()
+      : Base(0, RowsAtCompileTime == Dynamic ? 0 : RowsAtCompileTime,
+             ColsAtCompileTime == Dynamic ? 0 : ColsAtCompileTime),
+        // Stride<> does not allow default ctor for Dynamic strides, so let' initialize it with dummy values:
+        m_stride(StrideType::OuterStrideAtCompileTime == Dynamic ? 0 : StrideType::OuterStrideAtCompileTime,
+                 StrideType::InnerStrideAtCompileTime == Dynamic ? 0 : StrideType::InnerStrideAtCompileTime) {}
+
+  EIGEN_INHERIT_ASSIGNMENT_OPERATORS(RefBase)
+
+ protected:
+  typedef Stride<StrideType::OuterStrideAtCompileTime, StrideType::InnerStrideAtCompileTime> StrideBase;
+
+  // Resolves inner stride if default 0.
+  static EIGEN_DEVICE_FUNC constexpr Index resolveInnerStride(Index inner) { return inner == 0 ? 1 : inner; }
+
+  // Resolves outer stride if default 0.
+  static EIGEN_DEVICE_FUNC constexpr Index resolveOuterStride(Index inner, Index outer, Index rows, Index cols,
+                                                              bool isVectorAtCompileTime, bool isRowMajor) {
+    return outer == 0 ? isVectorAtCompileTime ? inner * rows * cols : isRowMajor ? inner * cols : inner * rows : outer;
+  }
+
+  // Returns true if construction is valid, false if there is a stride mismatch,
+  // and fails if there is a size mismatch.
+  template <typename Expression>
+  EIGEN_DEVICE_FUNC bool construct(Expression& expr) {
+    // Check matrix sizes.  If this is a compile-time vector, we do allow
+    // implicitly transposing.
+    EIGEN_STATIC_ASSERT(EIGEN_PREDICATE_SAME_MATRIX_SIZE(PlainObjectType, Expression)
+                            // If it is a vector, the transpose sizes might match.
+                            || (PlainObjectType::IsVectorAtCompileTime &&
+                                ((int(PlainObjectType::RowsAtCompileTime) == Eigen::Dynamic ||
+                                  int(Expression::ColsAtCompileTime) == Eigen::Dynamic ||
+                                  int(PlainObjectType::RowsAtCompileTime) == int(Expression::ColsAtCompileTime)) &&
+                                 (int(PlainObjectType::ColsAtCompileTime) == Eigen::Dynamic ||
+                                  int(Expression::RowsAtCompileTime) == Eigen::Dynamic ||
+                                  int(PlainObjectType::ColsAtCompileTime) == int(Expression::RowsAtCompileTime)))),
+                        YOU_MIXED_MATRICES_OF_DIFFERENT_SIZES)
+
+    // Determine runtime rows and columns.
+    Index rows = expr.rows();
+    Index cols = expr.cols();
+    if (PlainObjectType::RowsAtCompileTime == 1) {
+      eigen_assert(expr.rows() == 1 || expr.cols() == 1);
+      rows = 1;
+      cols = expr.size();
+    } else if (PlainObjectType::ColsAtCompileTime == 1) {
+      eigen_assert(expr.rows() == 1 || expr.cols() == 1);
+      rows = expr.size();
+      cols = 1;
+    }
+    // Verify that the sizes are valid.
+    eigen_assert((PlainObjectType::RowsAtCompileTime == Dynamic) || (PlainObjectType::RowsAtCompileTime == rows));
+    eigen_assert((PlainObjectType::ColsAtCompileTime == Dynamic) || (PlainObjectType::ColsAtCompileTime == cols));
+
+    // If this is a vector, we might be transposing, which means that stride should swap.
+    const bool transpose = PlainObjectType::IsVectorAtCompileTime && (rows != expr.rows());
+    // If the storage format differs, we also need to swap the stride.
+    const bool row_major = ((PlainObjectType::Flags)&RowMajorBit) != 0;
+    const bool expr_row_major = (Expression::Flags & RowMajorBit) != 0;
+    const bool storage_differs = (row_major != expr_row_major);
+
+    const bool swap_stride = (transpose != storage_differs);
+
+    // Determine expr's actual strides, resolving any defaults if zero.
+    const Index expr_inner_actual = resolveInnerStride(expr.innerStride());
+    const Index expr_outer_actual = resolveOuterStride(expr_inner_actual, expr.outerStride(), expr.rows(), expr.cols(),
+                                                       Expression::IsVectorAtCompileTime != 0, expr_row_major);
+
+    // If this is a column-major row vector or row-major column vector, the inner-stride
+    // is arbitrary, so set it to either the compile-time inner stride or 1.
+    const bool row_vector = (rows == 1);
+    const bool col_vector = (cols == 1);
+    const Index inner_stride =
+        ((!row_major && row_vector) || (row_major && col_vector))
+            ? (StrideType::InnerStrideAtCompileTime > 0 ? Index(StrideType::InnerStrideAtCompileTime) : 1)
+        : swap_stride ? expr_outer_actual
+                      : expr_inner_actual;
+
+    // If this is a column-major column vector or row-major row vector, the outer-stride
+    // is arbitrary, so set it to either the compile-time outer stride or vector size.
+    const Index outer_stride =
+        ((!row_major && col_vector) || (row_major && row_vector))
+            ? (StrideType::OuterStrideAtCompileTime > 0 ? Index(StrideType::OuterStrideAtCompileTime)
+                                                        : rows * cols * inner_stride)
+        : swap_stride ? expr_inner_actual
+                      : expr_outer_actual;
+
+    // Check if given inner/outer strides are compatible with compile-time strides.
+    const bool inner_valid = (StrideType::InnerStrideAtCompileTime == Dynamic) ||
+                             (resolveInnerStride(Index(StrideType::InnerStrideAtCompileTime)) == inner_stride);
+    if (!inner_valid) {
+      return false;
+    }
+
+    const bool outer_valid =
+        (StrideType::OuterStrideAtCompileTime == Dynamic) ||
+        (resolveOuterStride(inner_stride, Index(StrideType::OuterStrideAtCompileTime), rows, cols,
+                            PlainObjectType::IsVectorAtCompileTime != 0, row_major) == outer_stride);
+    if (!outer_valid) {
+      return false;
+    }
+
+    internal::construct_at<Base>(this, expr.data(), rows, cols);
+    internal::construct_at(&m_stride, (StrideType::OuterStrideAtCompileTime == 0) ? 0 : outer_stride,
+                           (StrideType::InnerStrideAtCompileTime == 0) ? 0 : inner_stride);
+    return true;
+  }
+
+  StrideBase m_stride;
+};
+
+/** \class Ref
+ * \ingroup Core_Module
+ *
+ * \brief A matrix or vector expression mapping an existing expression
+ *
+ * \tparam PlainObjectType the equivalent matrix type of the mapped data
+ * \tparam Options specifies the pointer alignment in bytes. It can be: \c #Aligned128, , \c #Aligned64, \c #Aligned32,
+ * \c #Aligned16, \c #Aligned8 or \c #Unaligned. The default is \c #Unaligned. \tparam StrideType optionally specifies
+ * strides. By default, Ref implies a contiguous storage along the inner dimension (inner stride==1), but accepts a
+ * variable outer stride (leading dimension). This can be overridden by specifying strides. The type passed here must be
+ * a specialization of the Stride template, see examples below.
+ *
+ * This class provides a way to write non-template functions taking Eigen objects as parameters while limiting the
+ * number of copies. A Ref<> object can represent either a const expression or a l-value: \code
+ * // in-out argument:
+ * void foo1(Ref<VectorXf> x);
+ *
+ * // read-only const argument:
+ * void foo2(const Ref<const VectorXf>& x);
+ * \endcode
+ *
+ * In the in-out case, the input argument must satisfy the constraints of the actual Ref<> type, otherwise a compilation
+ * issue will be triggered. By default, a Ref<VectorXf> can reference any dense vector expression of float having a
+ * contiguous memory layout. Likewise, a Ref<MatrixXf> can reference any column-major dense matrix expression of float
+ * whose column's elements are contiguously stored with the possibility to have a constant space in-between each column,
+ * i.e. the inner stride must be equal to 1, but the outer stride (or leading dimension) can be greater than the number
+ * of rows.
+ *
+ * In the const case, if the input expression does not match the above requirement, then it is evaluated into a
+ * temporary before being passed to the function. Here are some examples: \code MatrixXf A; VectorXf a; foo1(a.head());
+ * // OK foo1(A.col());              // OK foo1(A.row());              // Compilation error because here innerstride!=1
+ * foo2(A.row());              // Compilation error because A.row() is a 1xN object while foo2 is expecting a Nx1 object
+ * foo2(A.row().transpose());  // The row is copied into a contiguous temporary
+ * foo2(2*a);                  // The expression is evaluated into a temporary
+ * foo2(A.col().segment(2,4)); // No temporary
+ * \endcode
+ *
+ * The range of inputs that can be referenced without temporary can be enlarged using the last two template parameters.
+ * Here is an example accepting an innerstride!=1:
+ * \code
+ * // in-out argument:
+ * void foo3(Ref<VectorXf,0,InnerStride<> > x);
+ * foo3(A.row());              // OK
+ * \endcode
+ * The downside here is that the function foo3 might be significantly slower than foo1 because it won't be able to
+ * exploit vectorization, and will involve more expensive address computations even if the input is contiguously stored
+ * in memory. To overcome this issue, one might propose to overload internally calling a template function, e.g.: \code
+ * // in the .h:
+ * void foo(const Ref<MatrixXf>& A);
+ * void foo(const Ref<MatrixXf,0,Stride<> >& A);
+ *
+ * // in the .cpp:
+ * template<typename TypeOfA> void foo_impl(const TypeOfA& A) {
+ *     ... // crazy code goes here
+ * }
+ * void foo(const Ref<MatrixXf>& A) { foo_impl(A); }
+ * void foo(const Ref<MatrixXf,0,Stride<> >& A) { foo_impl(A); }
+ * \endcode
+ *
+ * See also the following stackoverflow questions for further references:
+ *  - <a href="http://stackoverflow.com/questions/21132538/correct-usage-of-the-eigenref-class">Correct usage of the
+ * Eigen::Ref<> class</a>
+ *
+ * \sa PlainObjectBase::Map(), \ref TopicStorageOrders
+ */
+template <typename PlainObjectType, int Options, typename StrideType>
+class Ref : public RefBase<Ref<PlainObjectType, Options, StrideType> > {
+ private:
+  typedef internal::traits<Ref> Traits;
+  template <typename Derived>
+  EIGEN_DEVICE_FUNC inline Ref(
+      const PlainObjectBase<Derived>& expr,
+      std::enable_if_t<bool(Traits::template match<Derived>::MatchAtCompileTime), Derived>* = 0);
+
+ public:
+  typedef RefBase<Ref> Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(Ref)
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+  template <typename Derived>
+  EIGEN_DEVICE_FUNC inline Ref(
+      PlainObjectBase<Derived>& expr,
+      std::enable_if_t<bool(Traits::template match<Derived>::MatchAtCompileTime), Derived>* = 0) {
+    EIGEN_STATIC_ASSERT(bool(Traits::template match<Derived>::MatchAtCompileTime), STORAGE_LAYOUT_DOES_NOT_MATCH);
+    // Construction must pass since we will not create temporary storage in the non-const case.
+    const bool success = Base::construct(expr.derived());
+    EIGEN_UNUSED_VARIABLE(success)
+    eigen_assert(success);
+  }
+  template <typename Derived>
+  EIGEN_DEVICE_FUNC inline Ref(
+      const DenseBase<Derived>& expr,
+      std::enable_if_t<bool(Traits::template match<Derived>::MatchAtCompileTime), Derived>* = 0)
+#else
+  /** Implicit constructor from any dense expression */
+  template <typename Derived>
+  inline Ref(DenseBase<Derived>& expr)
+#endif
+  {
+    EIGEN_STATIC_ASSERT(bool(internal::is_lvalue<Derived>::value), THIS_EXPRESSION_IS_NOT_A_LVALUE__IT_IS_READ_ONLY);
+    EIGEN_STATIC_ASSERT(bool(Traits::template match<Derived>::MatchAtCompileTime), STORAGE_LAYOUT_DOES_NOT_MATCH);
+    EIGEN_STATIC_ASSERT(!Derived::IsPlainObjectBase, THIS_EXPRESSION_IS_NOT_A_LVALUE__IT_IS_READ_ONLY);
+    // Construction must pass since we will not create temporary storage in the non-const case.
+    const bool success = Base::construct(expr.const_cast_derived());
+    EIGEN_UNUSED_VARIABLE(success)
+    eigen_assert(success);
+  }
+
+  EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Ref)
+};
+
+// this is the const ref version
+template <typename TPlainObjectType, int Options, typename StrideType>
+class Ref<const TPlainObjectType, Options, StrideType>
+    : public RefBase<Ref<const TPlainObjectType, Options, StrideType> > {
+  typedef internal::traits<Ref> Traits;
+
+  static constexpr bool may_map_m_object_successfully =
+      (static_cast<int>(StrideType::InnerStrideAtCompileTime) == 0 ||
+       static_cast<int>(StrideType::InnerStrideAtCompileTime) == 1 ||
+       static_cast<int>(StrideType::InnerStrideAtCompileTime) == Dynamic) &&
+      (TPlainObjectType::IsVectorAtCompileTime || static_cast<int>(StrideType::OuterStrideAtCompileTime) == 0 ||
+       static_cast<int>(StrideType::OuterStrideAtCompileTime) == Dynamic ||
+       static_cast<int>(StrideType::OuterStrideAtCompileTime) ==
+           static_cast<int>(TPlainObjectType::InnerSizeAtCompileTime) ||
+       static_cast<int>(TPlainObjectType::InnerSizeAtCompileTime) == Dynamic);
+
+ public:
+  typedef RefBase<Ref> Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(Ref)
+
+  template <typename Derived>
+  EIGEN_DEVICE_FUNC inline Ref(const DenseBase<Derived>& expr,
+                               std::enable_if_t<bool(Traits::template match<Derived>::ScalarTypeMatch), Derived>* = 0) {
+    //      std::cout << match_helper<Derived>::HasDirectAccess << "," << match_helper<Derived>::OuterStrideMatch << ","
+    //      << match_helper<Derived>::InnerStrideMatch << "\n"; std::cout << int(StrideType::OuterStrideAtCompileTime)
+    //      << " - " << int(Derived::OuterStrideAtCompileTime) << "\n"; std::cout <<
+    //      int(StrideType::InnerStrideAtCompileTime) << " - " << int(Derived::InnerStrideAtCompileTime) << "\n";
+    EIGEN_STATIC_ASSERT(Traits::template match<Derived>::type::value || may_map_m_object_successfully,
+                        STORAGE_LAYOUT_DOES_NOT_MATCH);
+    construct(expr.derived(), typename Traits::template match<Derived>::type());
+  }
+
+  EIGEN_DEVICE_FUNC inline Ref(const Ref& other) : Base(other) {
+    // copy constructor shall not copy the m_object, to avoid unnecessary malloc and copy
+  }
+
+  EIGEN_DEVICE_FUNC inline Ref(Ref&& other) {
+    if (other.data() == other.m_object.data()) {
+      m_object = std::move(other.m_object);
+      Base::construct(m_object);
+    } else
+      Base::construct(other);
+  }
+
+  template <typename OtherRef>
+  EIGEN_DEVICE_FUNC inline Ref(const RefBase<OtherRef>& other) {
+    EIGEN_STATIC_ASSERT(Traits::template match<OtherRef>::type::value || may_map_m_object_successfully,
+                        STORAGE_LAYOUT_DOES_NOT_MATCH);
+    construct(other.derived(), typename Traits::template match<OtherRef>::type());
+  }
+
+ protected:
+  template <typename Expression>
+  EIGEN_DEVICE_FUNC void construct(const Expression& expr, internal::true_type) {
+    // Check if we can use the underlying expr's storage directly, otherwise call the copy version.
+    if (!Base::construct(expr)) {
+      construct(expr, internal::false_type());
+    }
+  }
+
+  template <typename Expression>
+  EIGEN_DEVICE_FUNC void construct(const Expression& expr, internal::false_type) {
+    internal::call_assignment_no_alias(m_object, expr, internal::assign_op<Scalar, Scalar>());
+    const bool success = Base::construct(m_object);
+    EIGEN_ONLY_USED_FOR_DEBUG(success)
+    eigen_assert(success);
+  }
+
+ protected:
+  TPlainObjectType m_object;
+};
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_REF_H

eigen-master/Eigen/src/Core/Replicate.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_REPLICATE_H
+#define EIGEN_REPLICATE_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+template <typename MatrixType, int RowFactor, int ColFactor>
+struct traits<Replicate<MatrixType, RowFactor, ColFactor> > : traits<MatrixType> {
+  typedef typename MatrixType::Scalar Scalar;
+  typedef typename traits<MatrixType>::StorageKind StorageKind;
+  typedef typename traits<MatrixType>::XprKind XprKind;
+  typedef typename ref_selector<MatrixType>::type MatrixTypeNested;
+  typedef std::remove_reference_t<MatrixTypeNested> MatrixTypeNested_;
+  enum {
+    RowsAtCompileTime = RowFactor == Dynamic || int(MatrixType::RowsAtCompileTime) == Dynamic
+                            ? Dynamic
+                            : RowFactor * MatrixType::RowsAtCompileTime,
+    ColsAtCompileTime = ColFactor == Dynamic || int(MatrixType::ColsAtCompileTime) == Dynamic
+                            ? Dynamic
+                            : ColFactor * MatrixType::ColsAtCompileTime,
+    // FIXME we don't propagate the max sizes !!!
+    MaxRowsAtCompileTime = RowsAtCompileTime,
+    MaxColsAtCompileTime = ColsAtCompileTime,
+    IsRowMajor = MaxRowsAtCompileTime == 1 && MaxColsAtCompileTime != 1   ? 1
+                 : MaxColsAtCompileTime == 1 && MaxRowsAtCompileTime != 1 ? 0
+                 : (MatrixType::Flags & RowMajorBit)                      ? 1
+                                                                          : 0,
+
+    // FIXME enable DirectAccess with negative strides?
+    Flags = IsRowMajor ? RowMajorBit : 0
+  };
+};
+}  // namespace internal
+
+/**
+ * \class Replicate
+ * \ingroup Core_Module
+ *
+ * \brief Expression of the multiple replication of a matrix or vector
+ *
+ * \tparam MatrixType the type of the object we are replicating
+ * \tparam RowFactor number of repetitions at compile time along the vertical direction, can be Dynamic.
+ * \tparam ColFactor number of repetitions at compile time along the horizontal direction, can be Dynamic.
+ *
+ * This class represents an expression of the multiple replication of a matrix or vector.
+ * It is the return type of DenseBase::replicate() and most of the time
+ * this is the only way it is used.
+ *
+ * \sa DenseBase::replicate()
+ */
+template <typename MatrixType, int RowFactor, int ColFactor>
+class Replicate : public internal::dense_xpr_base<Replicate<MatrixType, RowFactor, ColFactor> >::type {
+  typedef typename internal::traits<Replicate>::MatrixTypeNested MatrixTypeNested;
+  typedef typename internal::traits<Replicate>::MatrixTypeNested_ MatrixTypeNested_;
+
+ public:
+  typedef typename internal::dense_xpr_base<Replicate>::type Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(Replicate)
+  typedef internal::remove_all_t<MatrixType> NestedExpression;
+
+  template <typename OriginalMatrixType>
+  EIGEN_DEVICE_FUNC inline explicit Replicate(const OriginalMatrixType& matrix)
+      : m_matrix(matrix), m_rowFactor(RowFactor), m_colFactor(ColFactor) {
+    EIGEN_STATIC_ASSERT((internal::is_same<std::remove_const_t<MatrixType>, OriginalMatrixType>::value),
+                        THE_MATRIX_OR_EXPRESSION_THAT_YOU_PASSED_DOES_NOT_HAVE_THE_EXPECTED_TYPE)
+    eigen_assert(RowFactor != Dynamic && ColFactor != Dynamic);
+  }
+
+  template <typename OriginalMatrixType>
+  EIGEN_DEVICE_FUNC inline Replicate(const OriginalMatrixType& matrix, Index rowFactor, Index colFactor)
+      : m_matrix(matrix), m_rowFactor(rowFactor), m_colFactor(colFactor) {
+    EIGEN_STATIC_ASSERT((internal::is_same<std::remove_const_t<MatrixType>, OriginalMatrixType>::value),
+                        THE_MATRIX_OR_EXPRESSION_THAT_YOU_PASSED_DOES_NOT_HAVE_THE_EXPECTED_TYPE)
+  }
+
+  EIGEN_DEVICE_FUNC constexpr Index rows() const { return m_matrix.rows() * m_rowFactor.value(); }
+  EIGEN_DEVICE_FUNC constexpr Index cols() const { return m_matrix.cols() * m_colFactor.value(); }
+
+  EIGEN_DEVICE_FUNC const MatrixTypeNested_& nestedExpression() const { return m_matrix; }
+
+ protected:
+  MatrixTypeNested m_matrix;
+  const internal::variable_if_dynamic<Index, RowFactor> m_rowFactor;
+  const internal::variable_if_dynamic<Index, ColFactor> m_colFactor;
+};
+
+/**
+ * \return an expression of the replication of \c *this
+ *
+ * Example: \include MatrixBase_replicate.cpp
+ * Output: \verbinclude MatrixBase_replicate.out
+ *
+ * \sa VectorwiseOp::replicate(), DenseBase::replicate(Index,Index), class Replicate
+ */
+template <typename Derived>
+template <int RowFactor, int ColFactor>
+EIGEN_DEVICE_FUNC const Replicate<Derived, RowFactor, ColFactor> DenseBase<Derived>::replicate() const {
+  return Replicate<Derived, RowFactor, ColFactor>(derived());
+}
+
+/**
+ * \return an expression of the replication of each column (or row) of \c *this
+ *
+ * Example: \include DirectionWise_replicate_int.cpp
+ * Output: \verbinclude DirectionWise_replicate_int.out
+ *
+ * \sa VectorwiseOp::replicate(), DenseBase::replicate(), class Replicate
+ */
+template <typename ExpressionType, int Direction>
+EIGEN_DEVICE_FUNC const typename VectorwiseOp<ExpressionType, Direction>::ReplicateReturnType
+VectorwiseOp<ExpressionType, Direction>::replicate(Index factor) const {
+  return typename VectorwiseOp<ExpressionType, Direction>::ReplicateReturnType(
+      _expression(), Direction == Vertical ? factor : 1, Direction == Horizontal ? factor : 1);
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_REPLICATE_H

eigen-master/Eigen/src/Core/Reshaped.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008-2017 Gael Guennebaud <gael.guennebaud@inria.fr>
+// Copyright (C) 2014 yoco <peter.xiau@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_RESHAPED_H
+#define EIGEN_RESHAPED_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+/** \class Reshaped
+ * \ingroup Core_Module
+ *
+ * \brief Expression of a fixed-size or dynamic-size reshape
+ *
+ * \tparam XprType the type of the expression in which we are taking a reshape
+ * \tparam Rows the number of rows of the reshape we are taking at compile time (optional)
+ * \tparam Cols the number of columns of the reshape we are taking at compile time (optional)
+ * \tparam Order can be ColMajor or RowMajor, default is ColMajor.
+ *
+ * This class represents an expression of either a fixed-size or dynamic-size reshape.
+ * It is the return type of DenseBase::reshaped(NRowsType,NColsType) and
+ * most of the time this is the only way it is used.
+ *
+ * If you want to directly manipulate reshaped expressions,
+ * for instance if you want to write a function returning such an expression,
+ * it is advised to use the \em auto keyword for such use cases.
+ *
+ * Here is an example illustrating the dynamic case:
+ * \include class_Reshaped.cpp
+ * Output: \verbinclude class_Reshaped.out
+ *
+ * Here is an example illustrating the fixed-size case:
+ * \include class_FixedReshaped.cpp
+ * Output: \verbinclude class_FixedReshaped.out
+ *
+ * \sa DenseBase::reshaped(NRowsType,NColsType)
+ */
+
+namespace internal {
+
+template <typename XprType, int Rows, int Cols, int Order>
+struct traits<Reshaped<XprType, Rows, Cols, Order> > : traits<XprType> {
+  typedef typename traits<XprType>::Scalar Scalar;
+  typedef typename traits<XprType>::StorageKind StorageKind;
+  typedef typename traits<XprType>::XprKind XprKind;
+  enum {
+    MatrixRows = traits<XprType>::RowsAtCompileTime,
+    MatrixCols = traits<XprType>::ColsAtCompileTime,
+    RowsAtCompileTime = Rows,
+    ColsAtCompileTime = Cols,
+    MaxRowsAtCompileTime = Rows,
+    MaxColsAtCompileTime = Cols,
+    XpxStorageOrder = ((int(traits<XprType>::Flags) & RowMajorBit) == RowMajorBit) ? RowMajor : ColMajor,
+    ReshapedStorageOrder = (RowsAtCompileTime == 1 && ColsAtCompileTime != 1)   ? RowMajor
+                           : (ColsAtCompileTime == 1 && RowsAtCompileTime != 1) ? ColMajor
+                                                                                : XpxStorageOrder,
+    HasSameStorageOrderAsXprType = (ReshapedStorageOrder == XpxStorageOrder),
+    InnerSize = (ReshapedStorageOrder == int(RowMajor)) ? int(ColsAtCompileTime) : int(RowsAtCompileTime),
+    InnerStrideAtCompileTime = HasSameStorageOrderAsXprType ? int(inner_stride_at_compile_time<XprType>::ret) : Dynamic,
+    OuterStrideAtCompileTime = Dynamic,
+
+    HasDirectAccess = internal::has_direct_access<XprType>::ret && (Order == int(XpxStorageOrder)) &&
+                      ((evaluator<XprType>::Flags & LinearAccessBit) == LinearAccessBit),
+
+    MaskPacketAccessBit =
+        (InnerSize == Dynamic || (InnerSize % packet_traits<Scalar>::size) == 0) && (InnerStrideAtCompileTime == 1)
+            ? PacketAccessBit
+            : 0,
+    // MaskAlignedBit = ((OuterStrideAtCompileTime!=Dynamic) && (((OuterStrideAtCompileTime * int(sizeof(Scalar))) % 16)
+    // == 0)) ? AlignedBit : 0,
+    FlagsLinearAccessBit = (RowsAtCompileTime == 1 || ColsAtCompileTime == 1) ? LinearAccessBit : 0,
+    FlagsLvalueBit = is_lvalue<XprType>::value ? LvalueBit : 0,
+    FlagsRowMajorBit = (ReshapedStorageOrder == int(RowMajor)) ? RowMajorBit : 0,
+    FlagsDirectAccessBit = HasDirectAccess ? DirectAccessBit : 0,
+    Flags0 = traits<XprType>::Flags & ((HereditaryBits & ~RowMajorBit) | MaskPacketAccessBit),
+
+    Flags = (Flags0 | FlagsLinearAccessBit | FlagsLvalueBit | FlagsRowMajorBit | FlagsDirectAccessBit)
+  };
+};
+
+template <typename XprType, int Rows, int Cols, int Order, bool HasDirectAccess>
+class ReshapedImpl_dense;
+
+}  // end namespace internal
+
+template <typename XprType, int Rows, int Cols, int Order, typename StorageKind>
+class ReshapedImpl;
+
+template <typename XprType, int Rows, int Cols, int Order>
+class Reshaped : public ReshapedImpl<XprType, Rows, Cols, Order, typename internal::traits<XprType>::StorageKind> {
+  typedef ReshapedImpl<XprType, Rows, Cols, Order, typename internal::traits<XprType>::StorageKind> Impl;
+
+ public:
+  // typedef typename Impl::Base Base;
+  typedef Impl Base;
+  EIGEN_GENERIC_PUBLIC_INTERFACE(Reshaped)
+  EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Reshaped)
+
+  /** Fixed-size constructor
+   */
+  EIGEN_DEVICE_FUNC inline Reshaped(XprType& xpr) : Impl(xpr) {
+    EIGEN_STATIC_ASSERT(RowsAtCompileTime != Dynamic && ColsAtCompileTime != Dynamic,
+                        THIS_METHOD_IS_ONLY_FOR_FIXED_SIZE)
+    eigen_assert(Rows * Cols == xpr.rows() * xpr.cols());
+  }
+
+  /** Dynamic-size constructor
+   */
+  EIGEN_DEVICE_FUNC inline Reshaped(XprType& xpr, Index reshapeRows, Index reshapeCols)
+      : Impl(xpr, reshapeRows, reshapeCols) {
+    eigen_assert((RowsAtCompileTime == Dynamic || RowsAtCompileTime == reshapeRows) &&
+                 (ColsAtCompileTime == Dynamic || ColsAtCompileTime == reshapeCols));
+    eigen_assert(reshapeRows * reshapeCols == xpr.rows() * xpr.cols());
+  }
+};
+
+// The generic default implementation for dense reshape simply forward to the internal::ReshapedImpl_dense
+// that must be specialized for direct and non-direct access...
+template <typename XprType, int Rows, int Cols, int Order>
+class ReshapedImpl<XprType, Rows, Cols, Order, Dense>
+    : public internal::ReshapedImpl_dense<XprType, Rows, Cols, Order,
+                                          internal::traits<Reshaped<XprType, Rows, Cols, Order> >::HasDirectAccess> {
+  typedef internal::ReshapedImpl_dense<XprType, Rows, Cols, Order,
+                                       internal::traits<Reshaped<XprType, Rows, Cols, Order> >::HasDirectAccess>
+      Impl;
+
+ public:
+  typedef Impl Base;
+  EIGEN_INHERIT_ASSIGNMENT_OPERATORS(ReshapedImpl)
+  EIGEN_DEVICE_FUNC inline ReshapedImpl(XprType& xpr) : Impl(xpr) {}
+  EIGEN_DEVICE_FUNC inline ReshapedImpl(XprType& xpr, Index reshapeRows, Index reshapeCols)
+      : Impl(xpr, reshapeRows, reshapeCols) {}
+};
+
+namespace internal {
+
+/** \internal Internal implementation of dense Reshaped in the general case. */
+template <typename XprType, int Rows, int Cols, int Order>
+class ReshapedImpl_dense<XprType, Rows, Cols, Order, false>
+    : public internal::dense_xpr_base<Reshaped<XprType, Rows, Cols, Order> >::type {
+  typedef Reshaped<XprType, Rows, Cols, Order> ReshapedType;
+
+ public:
+  typedef typename internal::dense_xpr_base<ReshapedType>::type Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(ReshapedType)
+  EIGEN_INHERIT_ASSIGNMENT_OPERATORS(ReshapedImpl_dense)
+
+  typedef typename internal::ref_selector<XprType>::non_const_type MatrixTypeNested;
+  typedef internal::remove_all_t<XprType> NestedExpression;
+
+  class InnerIterator;
+
+  /** Fixed-size constructor
+   */
+  EIGEN_DEVICE_FUNC inline ReshapedImpl_dense(XprType& xpr) : m_xpr(xpr), m_rows(Rows), m_cols(Cols) {}
+
+  /** Dynamic-size constructor
+   */
+  EIGEN_DEVICE_FUNC inline ReshapedImpl_dense(XprType& xpr, Index nRows, Index nCols)
+      : m_xpr(xpr), m_rows(nRows), m_cols(nCols) {}
+
+  EIGEN_DEVICE_FUNC Index rows() const { return m_rows; }
+  EIGEN_DEVICE_FUNC Index cols() const { return m_cols; }
+
+#ifdef EIGEN_PARSED_BY_DOXYGEN
+  /** \sa MapBase::data() */
+  EIGEN_DEVICE_FUNC constexpr const Scalar* data() const;
+  EIGEN_DEVICE_FUNC inline Index innerStride() const;
+  EIGEN_DEVICE_FUNC inline Index outerStride() const;
+#endif
+
+  /** \returns the nested expression */
+  EIGEN_DEVICE_FUNC const internal::remove_all_t<XprType>& nestedExpression() const { return m_xpr; }
+
+  /** \returns the nested expression */
+  EIGEN_DEVICE_FUNC std::remove_reference_t<XprType>& nestedExpression() { return m_xpr; }
+
+ protected:
+  MatrixTypeNested m_xpr;
+  const internal::variable_if_dynamic<Index, Rows> m_rows;
+  const internal::variable_if_dynamic<Index, Cols> m_cols;
+};
+
+/** \internal Internal implementation of dense Reshaped in the direct access case. */
+template <typename XprType, int Rows, int Cols, int Order>
+class ReshapedImpl_dense<XprType, Rows, Cols, Order, true> : public MapBase<Reshaped<XprType, Rows, Cols, Order> > {
+  typedef Reshaped<XprType, Rows, Cols, Order> ReshapedType;
+  typedef typename internal::ref_selector<XprType>::non_const_type XprTypeNested;
+
+ public:
+  typedef MapBase<ReshapedType> Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(ReshapedType)
+  EIGEN_INHERIT_ASSIGNMENT_OPERATORS(ReshapedImpl_dense)
+
+  /** Fixed-size constructor
+   */
+  EIGEN_DEVICE_FUNC inline ReshapedImpl_dense(XprType& xpr) : Base(xpr.data()), m_xpr(xpr) {}
+
+  /** Dynamic-size constructor
+   */
+  EIGEN_DEVICE_FUNC inline ReshapedImpl_dense(XprType& xpr, Index nRows, Index nCols)
+      : Base(xpr.data(), nRows, nCols), m_xpr(xpr) {}
+
+  EIGEN_DEVICE_FUNC const internal::remove_all_t<XprTypeNested>& nestedExpression() const { return m_xpr; }
+
+  EIGEN_DEVICE_FUNC XprType& nestedExpression() { return m_xpr; }
+
+  /** \sa MapBase::innerStride() */
+  EIGEN_DEVICE_FUNC constexpr Index innerStride() const { return m_xpr.innerStride(); }
+
+  /** \sa MapBase::outerStride() */
+  EIGEN_DEVICE_FUNC constexpr Index outerStride() const {
+    return (((Flags & RowMajorBit) == RowMajorBit) ? this->cols() : this->rows()) * m_xpr.innerStride();
+  }
+
+ protected:
+  XprTypeNested m_xpr;
+};
+
+// Evaluators
+template <typename ArgType, int Rows, int Cols, int Order, bool HasDirectAccess>
+struct reshaped_evaluator;
+
+template <typename ArgType, int Rows, int Cols, int Order>
+struct evaluator<Reshaped<ArgType, Rows, Cols, Order> >
+    : reshaped_evaluator<ArgType, Rows, Cols, Order, traits<Reshaped<ArgType, Rows, Cols, Order> >::HasDirectAccess> {
+  typedef Reshaped<ArgType, Rows, Cols, Order> XprType;
+  typedef typename XprType::Scalar Scalar;
+  // TODO: should check for smaller packet types
+  typedef typename packet_traits<Scalar>::type PacketScalar;
+
+  enum {
+    CoeffReadCost = evaluator<ArgType>::CoeffReadCost,
+    HasDirectAccess = traits<XprType>::HasDirectAccess,
+
+    //     RowsAtCompileTime = traits<XprType>::RowsAtCompileTime,
+    //     ColsAtCompileTime = traits<XprType>::ColsAtCompileTime,
+    //     MaxRowsAtCompileTime = traits<XprType>::MaxRowsAtCompileTime,
+    //     MaxColsAtCompileTime = traits<XprType>::MaxColsAtCompileTime,
+    //
+    //     InnerStrideAtCompileTime = traits<XprType>::HasSameStorageOrderAsXprType
+    //                              ? int(inner_stride_at_compile_time<ArgType>::ret)
+    //                              : Dynamic,
+    //     OuterStrideAtCompileTime = Dynamic,
+
+    FlagsLinearAccessBit =
+        (traits<XprType>::RowsAtCompileTime == 1 || traits<XprType>::ColsAtCompileTime == 1 || HasDirectAccess)
+            ? LinearAccessBit
+            : 0,
+    FlagsRowMajorBit = (traits<XprType>::ReshapedStorageOrder == int(RowMajor)) ? RowMajorBit : 0,
+    FlagsDirectAccessBit = HasDirectAccess ? DirectAccessBit : 0,
+    Flags0 = evaluator<ArgType>::Flags & (HereditaryBits & ~RowMajorBit),
+    Flags = Flags0 | FlagsLinearAccessBit | FlagsRowMajorBit | FlagsDirectAccessBit,
+
+    PacketAlignment = unpacket_traits<PacketScalar>::alignment,
+    Alignment = evaluator<ArgType>::Alignment
+  };
+  typedef reshaped_evaluator<ArgType, Rows, Cols, Order, HasDirectAccess> reshaped_evaluator_type;
+  EIGEN_DEVICE_FUNC explicit evaluator(const XprType& xpr) : reshaped_evaluator_type(xpr) {
+    EIGEN_INTERNAL_CHECK_COST_VALUE(CoeffReadCost);
+  }
+};
+
+template <typename ArgType, int Rows, int Cols, int Order>
+struct reshaped_evaluator<ArgType, Rows, Cols, Order, /* HasDirectAccess */ false>
+    : evaluator_base<Reshaped<ArgType, Rows, Cols, Order> > {
+  typedef Reshaped<ArgType, Rows, Cols, Order> XprType;
+
+  enum {
+    CoeffReadCost = evaluator<ArgType>::CoeffReadCost /* TODO + cost of index computations */,
+
+    Flags = (evaluator<ArgType>::Flags & (HereditaryBits /*| LinearAccessBit | DirectAccessBit*/)),
+
+    Alignment = 0
+  };
+
+  EIGEN_DEVICE_FUNC explicit reshaped_evaluator(const XprType& xpr) : m_argImpl(xpr.nestedExpression()), m_xpr(xpr) {
+    EIGEN_INTERNAL_CHECK_COST_VALUE(CoeffReadCost);
+  }
+
+  typedef typename XprType::Scalar Scalar;
+  typedef typename XprType::CoeffReturnType CoeffReturnType;
+
+  typedef std::pair<Index, Index> RowCol;
+
+  EIGEN_DEVICE_FUNC inline RowCol index_remap(Index rowId, Index colId) const {
+    if (Order == ColMajor) {
+      const Index nth_elem_idx = colId * m_xpr.rows() + rowId;
+      return RowCol(nth_elem_idx % m_xpr.nestedExpression().rows(), nth_elem_idx / m_xpr.nestedExpression().rows());
+    } else {
+      const Index nth_elem_idx = colId + rowId * m_xpr.cols();
+      return RowCol(nth_elem_idx / m_xpr.nestedExpression().cols(), nth_elem_idx % m_xpr.nestedExpression().cols());
+    }
+  }
+
+  EIGEN_DEVICE_FUNC inline Scalar& coeffRef(Index rowId, Index colId) {
+    EIGEN_STATIC_ASSERT_LVALUE(XprType)
+    const RowCol row_col = index_remap(rowId, colId);
+    return m_argImpl.coeffRef(row_col.first, row_col.second);
+  }
+
+  EIGEN_DEVICE_FUNC inline const Scalar& coeffRef(Index rowId, Index colId) const {
+    const RowCol row_col = index_remap(rowId, colId);
+    return m_argImpl.coeffRef(row_col.first, row_col.second);
+  }
+
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const CoeffReturnType coeff(Index rowId, Index colId) const {
+    const RowCol row_col = index_remap(rowId, colId);
+    return m_argImpl.coeff(row_col.first, row_col.second);
+  }
+
+  EIGEN_DEVICE_FUNC inline Scalar& coeffRef(Index index) {
+    EIGEN_STATIC_ASSERT_LVALUE(XprType)
+    const RowCol row_col = index_remap(Rows == 1 ? 0 : index, Rows == 1 ? index : 0);
+    return m_argImpl.coeffRef(row_col.first, row_col.second);
+  }
+
+  EIGEN_DEVICE_FUNC inline const Scalar& coeffRef(Index index) const {
+    const RowCol row_col = index_remap(Rows == 1 ? 0 : index, Rows == 1 ? index : 0);
+    return m_argImpl.coeffRef(row_col.first, row_col.second);
+  }
+
+  EIGEN_DEVICE_FUNC inline const CoeffReturnType coeff(Index index) const {
+    const RowCol row_col = index_remap(Rows == 1 ? 0 : index, Rows == 1 ? index : 0);
+    return m_argImpl.coeff(row_col.first, row_col.second);
+  }
+#if 0
+  EIGEN_DEVICE_FUNC
+  template<int LoadMode>
+  inline PacketScalar packet(Index rowId, Index colId) const
+  {
+    const RowCol row_col = index_remap(rowId, colId);
+    return m_argImpl.template packet<Unaligned>(row_col.first, row_col.second);
+
+  }
+
+  template<int LoadMode>
+  EIGEN_DEVICE_FUNC
+  inline void writePacket(Index rowId, Index colId, const PacketScalar& val)
+  {
+    const RowCol row_col = index_remap(rowId, colId);
+    m_argImpl.const_cast_derived().template writePacket<Unaligned>
+            (row_col.first, row_col.second, val);
+  }
+
+  template<int LoadMode>
+  EIGEN_DEVICE_FUNC
+  inline PacketScalar packet(Index index) const
+  {
+    const RowCol row_col = index_remap(RowsAtCompileTime == 1 ? 0 : index,
+                                        RowsAtCompileTime == 1 ? index : 0);
+    return m_argImpl.template packet<Unaligned>(row_col.first, row_col.second);
+  }
+
+  template<int LoadMode>
+  EIGEN_DEVICE_FUNC
+  inline void writePacket(Index index, const PacketScalar& val)
+  {
+    const RowCol row_col = index_remap(RowsAtCompileTime == 1 ? 0 : index,
+                                        RowsAtCompileTime == 1 ? index : 0);
+    return m_argImpl.template packet<Unaligned>(row_col.first, row_col.second, val);
+  }
+#endif
+ protected:
+  evaluator<ArgType> m_argImpl;
+  const XprType& m_xpr;
+};
+
+template <typename ArgType, int Rows, int Cols, int Order>
+struct reshaped_evaluator<ArgType, Rows, Cols, Order, /* HasDirectAccess */ true>
+    : mapbase_evaluator<Reshaped<ArgType, Rows, Cols, Order>,
+                        typename Reshaped<ArgType, Rows, Cols, Order>::PlainObject> {
+  typedef Reshaped<ArgType, Rows, Cols, Order> XprType;
+  typedef typename XprType::Scalar Scalar;
+
+  EIGEN_DEVICE_FUNC explicit reshaped_evaluator(const XprType& xpr)
+      : mapbase_evaluator<XprType, typename XprType::PlainObject>(xpr) {
+    // TODO: for the 3.4 release, this should be turned to an internal assertion, but let's keep it as is for the beta
+    // lifetime
+    eigen_assert(((std::uintptr_t(xpr.data()) % plain_enum_max(1, evaluator<XprType>::Alignment)) == 0) &&
+                 "data is not aligned");
+  }
+};
+
+}  // end namespace internal
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_RESHAPED_H

eigen-master/Eigen/src/Core/ReturnByValue.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
+// Copyright (C) 2009-2010 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_RETURNBYVALUE_H
+#define EIGEN_RETURNBYVALUE_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+template <typename Derived>
+struct traits<ReturnByValue<Derived> > : public traits<typename traits<Derived>::ReturnType> {
+  enum {
+    // We're disabling the DirectAccess because e.g. the constructor of
+    // the Block-with-DirectAccess expression requires to have a coeffRef method.
+    // Also, we don't want to have to implement the stride stuff.
+    Flags = (traits<typename traits<Derived>::ReturnType>::Flags | EvalBeforeNestingBit) & ~DirectAccessBit
+  };
+};
+
+/* The ReturnByValue object doesn't even have a coeff() method.
+ * So the only way that nesting it in an expression can work, is by evaluating it into a plain matrix.
+ * So internal::nested always gives the plain return matrix type.
+ *
+ * FIXME: I don't understand why we need this specialization: isn't this taken care of by the EvalBeforeNestingBit ??
+ * Answer: EvalBeforeNestingBit should be deprecated since we have the evaluators
+ */
+template <typename Derived, int n, typename PlainObject>
+struct nested_eval<ReturnByValue<Derived>, n, PlainObject> {
+  typedef typename traits<Derived>::ReturnType type;
+};
+
+}  // end namespace internal
+
+/** \class ReturnByValue
+ * \ingroup Core_Module
+ *
+ */
+template <typename Derived>
+class ReturnByValue : public internal::dense_xpr_base<ReturnByValue<Derived> >::type, internal::no_assignment_operator {
+ public:
+  typedef typename internal::traits<Derived>::ReturnType ReturnType;
+
+  typedef typename internal::dense_xpr_base<ReturnByValue>::type Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(ReturnByValue)
+
+  template <typename Dest>
+  EIGEN_DEVICE_FUNC inline void evalTo(Dest& dst) const {
+    static_cast<const Derived*>(this)->evalTo(dst);
+  }
+  EIGEN_DEVICE_FUNC constexpr Index rows() const noexcept { return static_cast<const Derived*>(this)->rows(); }
+  EIGEN_DEVICE_FUNC constexpr Index cols() const noexcept { return static_cast<const Derived*>(this)->cols(); }
+
+#ifndef EIGEN_PARSED_BY_DOXYGEN
+#define Unusable \
+  YOU_ARE_TRYING_TO_ACCESS_A_SINGLE_COEFFICIENT_IN_A_SPECIAL_EXPRESSION_WHERE_THAT_IS_NOT_ALLOWED_BECAUSE_THAT_WOULD_BE_INEFFICIENT
+  class Unusable {
+    Unusable(const Unusable&) {}
+    Unusable& operator=(const Unusable&) { return *this; }
+  };
+  const Unusable& coeff(Index) const { return *reinterpret_cast<const Unusable*>(this); }
+  const Unusable& coeff(Index, Index) const { return *reinterpret_cast<const Unusable*>(this); }
+  Unusable& coeffRef(Index) { return *reinterpret_cast<Unusable*>(this); }
+  Unusable& coeffRef(Index, Index) { return *reinterpret_cast<Unusable*>(this); }
+#undef Unusable
+#endif
+};
+
+template <typename Derived>
+template <typename OtherDerived>
+EIGEN_DEVICE_FUNC Derived& DenseBase<Derived>::operator=(const ReturnByValue<OtherDerived>& other) {
+  other.evalTo(derived());
+  return derived();
+}
+
+namespace internal {
+
+// Expression is evaluated in a temporary; default implementation of Assignment is bypassed so that
+// when a ReturnByValue expression is assigned, the evaluator is not constructed.
+// TODO: Finalize port to new regime; ReturnByValue should not exist in the expression world
+
+template <typename Derived>
+struct evaluator<ReturnByValue<Derived> > : public evaluator<typename internal::traits<Derived>::ReturnType> {
+  typedef ReturnByValue<Derived> XprType;
+  typedef typename internal::traits<Derived>::ReturnType PlainObject;
+  typedef evaluator<PlainObject> Base;
+
+  EIGEN_DEVICE_FUNC explicit evaluator(const XprType& xpr) : m_result(xpr.rows(), xpr.cols()) {
+    internal::construct_at<Base>(this, m_result);
+    xpr.evalTo(m_result);
+  }
+
+ protected:
+  PlainObject m_result;
+};
+
+}  // end namespace internal
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_RETURNBYVALUE_H

eigen-master/Eigen/src/Core/Reverse.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
+// Copyright (C) 2009 Ricard Marxer <email@ricardmarxer.com>
+// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_REVERSE_H
+#define EIGEN_REVERSE_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+namespace internal {
+
+template <typename MatrixType, int Direction>
+struct traits<Reverse<MatrixType, Direction> > : traits<MatrixType> {
+  typedef typename MatrixType::Scalar Scalar;
+  typedef typename traits<MatrixType>::StorageKind StorageKind;
+  typedef typename traits<MatrixType>::XprKind XprKind;
+  typedef typename ref_selector<MatrixType>::type MatrixTypeNested;
+  typedef std::remove_reference_t<MatrixTypeNested> MatrixTypeNested_;
+  enum {
+    RowsAtCompileTime = MatrixType::RowsAtCompileTime,
+    ColsAtCompileTime = MatrixType::ColsAtCompileTime,
+    MaxRowsAtCompileTime = MatrixType::MaxRowsAtCompileTime,
+    MaxColsAtCompileTime = MatrixType::MaxColsAtCompileTime,
+    Flags = MatrixTypeNested_::Flags & (RowMajorBit | LvalueBit)
+  };
+};
+
+template <typename PacketType, bool ReversePacket>
+struct reverse_packet_cond {
+  static inline PacketType run(const PacketType& x) { return preverse(x); }
+};
+
+template <typename PacketType>
+struct reverse_packet_cond<PacketType, false> {
+  static inline PacketType run(const PacketType& x) { return x; }
+};
+
+}  // end namespace internal
+
+/** \class Reverse
+ * \ingroup Core_Module
+ *
+ * \brief Expression of the reverse of a vector or matrix
+ *
+ * \tparam MatrixType the type of the object of which we are taking the reverse
+ * \tparam Direction defines the direction of the reverse operation, can be Vertical, Horizontal, or BothDirections
+ *
+ * This class represents an expression of the reverse of a vector.
+ * It is the return type of MatrixBase::reverse() and VectorwiseOp::reverse()
+ * and most of the time this is the only way it is used.
+ *
+ * \sa MatrixBase::reverse(), VectorwiseOp::reverse()
+ */
+template <typename MatrixType, int Direction>
+class Reverse : public internal::dense_xpr_base<Reverse<MatrixType, Direction> >::type {
+ public:
+  typedef typename internal::dense_xpr_base<Reverse>::type Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(Reverse)
+  typedef internal::remove_all_t<MatrixType> NestedExpression;
+  using Base::IsRowMajor;
+
+ protected:
+  enum {
+    PacketSize = internal::packet_traits<Scalar>::size,
+    IsColMajor = !IsRowMajor,
+    ReverseRow = (Direction == Vertical) || (Direction == BothDirections),
+    ReverseCol = (Direction == Horizontal) || (Direction == BothDirections),
+    OffsetRow = ReverseRow && IsColMajor ? PacketSize : 1,
+    OffsetCol = ReverseCol && IsRowMajor ? PacketSize : 1,
+    ReversePacket = (Direction == BothDirections) || ((Direction == Vertical) && IsColMajor) ||
+                    ((Direction == Horizontal) && IsRowMajor)
+  };
+  typedef internal::reverse_packet_cond<PacketScalar, ReversePacket> reverse_packet;
+
+ public:
+  EIGEN_DEVICE_FUNC explicit inline Reverse(const MatrixType& matrix) : m_matrix(matrix) {}
+
+  EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Reverse)
+
+  EIGEN_DEVICE_FUNC constexpr Index rows() const noexcept { return m_matrix.rows(); }
+  EIGEN_DEVICE_FUNC constexpr Index cols() const noexcept { return m_matrix.cols(); }
+
+  EIGEN_DEVICE_FUNC inline Index innerStride() const { return -m_matrix.innerStride(); }
+
+  EIGEN_DEVICE_FUNC const internal::remove_all_t<typename MatrixType::Nested>& nestedExpression() const {
+    return m_matrix;
+  }
+
+ protected:
+  typename MatrixType::Nested m_matrix;
+};
+
+/** \returns an expression of the reverse of *this.
+ *
+ * Example: \include MatrixBase_reverse.cpp
+ * Output: \verbinclude MatrixBase_reverse.out
+ *
+ */
+template <typename Derived>
+EIGEN_DEVICE_FUNC inline typename DenseBase<Derived>::ReverseReturnType DenseBase<Derived>::reverse() {
+  return ReverseReturnType(derived());
+}
+
+// reverse const overload moved DenseBase.h due to a CUDA compiler bug
+
+/** This is the "in place" version of reverse: it reverses \c *this.
+ *
+ * In most cases it is probably better to simply use the reversed expression
+ * of a matrix. However, when reversing the matrix data itself is really needed,
+ * then this "in-place" version is probably the right choice because it provides
+ * the following additional benefits:
+ *  - less error prone: doing the same operation with .reverse() requires special care:
+ *    \code m = m.reverse().eval(); \endcode
+ *  - this API enables reverse operations without the need for a temporary
+ *  - it allows future optimizations (cache friendliness, etc.)
+ *
+ * \sa VectorwiseOp::reverseInPlace(), reverse() */
+template <typename Derived>
+EIGEN_DEVICE_FUNC inline void DenseBase<Derived>::reverseInPlace() {
+  constexpr int HalfRowsAtCompileTime = RowsAtCompileTime == Dynamic ? Dynamic : RowsAtCompileTime / 2;
+  constexpr int HalfColsAtCompileTime = ColsAtCompileTime == Dynamic ? Dynamic : ColsAtCompileTime / 2;
+  if (cols() > rows()) {
+    Index half = cols() / 2;
+    this->template leftCols<HalfColsAtCompileTime>(half).swap(
+        this->template rightCols<HalfColsAtCompileTime>(half).reverse());
+    if ((cols() % 2) == 1) {
+      Index half2 = rows() / 2;
+      col(half).template head<HalfRowsAtCompileTime>(half2).swap(
+          col(half).template tail<HalfRowsAtCompileTime>(half2).reverse());
+    }
+  } else {
+    Index half = rows() / 2;
+    this->template topRows<HalfRowsAtCompileTime>(half).swap(
+        this->template bottomRows<HalfRowsAtCompileTime>(half).reverse());
+    if ((rows() % 2) == 1) {
+      Index half2 = cols() / 2;
+      row(half).template head<HalfColsAtCompileTime>(half2).swap(
+          row(half).template tail<HalfColsAtCompileTime>(half2).reverse());
+    }
+  }
+}
+
+namespace internal {
+
+template <int Direction>
+struct vectorwise_reverse_inplace_impl;
+
+template <>
+struct vectorwise_reverse_inplace_impl<Vertical> {
+  template <typename ExpressionType>
+  static void run(ExpressionType& xpr) {
+    constexpr Index HalfAtCompileTime =
+        ExpressionType::RowsAtCompileTime == Dynamic ? Dynamic : ExpressionType::RowsAtCompileTime / 2;
+    Index half = xpr.rows() / 2;
+    xpr.template topRows<HalfAtCompileTime>(half).swap(
+        xpr.template bottomRows<HalfAtCompileTime>(half).colwise().reverse());
+  }
+};
+
+template <>
+struct vectorwise_reverse_inplace_impl<Horizontal> {
+  template <typename ExpressionType>
+  static void run(ExpressionType& xpr) {
+    constexpr Index HalfAtCompileTime =
+        ExpressionType::ColsAtCompileTime == Dynamic ? Dynamic : ExpressionType::ColsAtCompileTime / 2;
+    Index half = xpr.cols() / 2;
+    xpr.template leftCols<HalfAtCompileTime>(half).swap(
+        xpr.template rightCols<HalfAtCompileTime>(half).rowwise().reverse());
+  }
+};
+
+}  // end namespace internal
+
+/** This is the "in place" version of VectorwiseOp::reverse: it reverses each column or row of \c *this.
+ *
+ * In most cases it is probably better to simply use the reversed expression
+ * of a matrix. However, when reversing the matrix data itself is really needed,
+ * then this "in-place" version is probably the right choice because it provides
+ * the following additional benefits:
+ *  - less error prone: doing the same operation with .reverse() requires special care:
+ *    \code m = m.reverse().eval(); \endcode
+ *  - this API enables reverse operations without the need for a temporary
+ *
+ * \sa DenseBase::reverseInPlace(), reverse() */
+template <typename ExpressionType, int Direction>
+EIGEN_DEVICE_FUNC void VectorwiseOp<ExpressionType, Direction>::reverseInPlace() {
+  internal::vectorwise_reverse_inplace_impl<Direction>::run(m_matrix);
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_REVERSE_H

eigen-master/Eigen/src/Core/Select.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_SELECT_H
+#define EIGEN_SELECT_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+/** \class Select
+ * \ingroup Core_Module
+ *
+ * \brief Expression of a coefficient wise version of the C++ ternary operator ?:
+ *
+ * \tparam ConditionMatrixType the type of the \em condition expression which must be a boolean matrix
+ * \tparam ThenMatrixType the type of the \em then expression
+ * \tparam ElseMatrixType the type of the \em else expression
+ *
+ * This class represents an expression of a coefficient wise version of the C++ ternary operator ?:.
+ * It is the return type of DenseBase::select() and most of the time this is the only way it is used.
+ *
+ * \sa DenseBase::select(const DenseBase<ThenDerived>&, const DenseBase<ElseDerived>&) const
+ */
+
+namespace internal {
+template <typename ConditionMatrixType, typename ThenMatrixType, typename ElseMatrixType>
+struct traits<Select<ConditionMatrixType, ThenMatrixType, ElseMatrixType> > : traits<ThenMatrixType> {
+  typedef typename traits<ThenMatrixType>::Scalar Scalar;
+  typedef Dense StorageKind;
+  typedef typename traits<ThenMatrixType>::XprKind XprKind;
+  typedef typename ConditionMatrixType::Nested ConditionMatrixNested;
+  typedef typename ThenMatrixType::Nested ThenMatrixNested;
+  typedef typename ElseMatrixType::Nested ElseMatrixNested;
+  enum {
+    RowsAtCompileTime = ConditionMatrixType::RowsAtCompileTime,
+    ColsAtCompileTime = ConditionMatrixType::ColsAtCompileTime,
+    MaxRowsAtCompileTime = ConditionMatrixType::MaxRowsAtCompileTime,
+    MaxColsAtCompileTime = ConditionMatrixType::MaxColsAtCompileTime,
+    Flags = (unsigned int)ThenMatrixType::Flags & ElseMatrixType::Flags & RowMajorBit
+  };
+};
+}  // namespace internal
+
+template <typename ConditionMatrixType, typename ThenMatrixType, typename ElseMatrixType>
+class Select : public internal::dense_xpr_base<Select<ConditionMatrixType, ThenMatrixType, ElseMatrixType> >::type,
+               internal::no_assignment_operator {
+ public:
+  typedef typename internal::dense_xpr_base<Select>::type Base;
+  EIGEN_DENSE_PUBLIC_INTERFACE(Select)
+
+  inline EIGEN_DEVICE_FUNC Select(const ConditionMatrixType& a_conditionMatrix, const ThenMatrixType& a_thenMatrix,
+                                  const ElseMatrixType& a_elseMatrix)
+      : m_condition(a_conditionMatrix), m_then(a_thenMatrix), m_else(a_elseMatrix) {
+    eigen_assert(m_condition.rows() == m_then.rows() && m_condition.rows() == m_else.rows());
+    eigen_assert(m_condition.cols() == m_then.cols() && m_condition.cols() == m_else.cols());
+  }
+
+  EIGEN_DEVICE_FUNC constexpr Index rows() const noexcept { return m_condition.rows(); }
+  EIGEN_DEVICE_FUNC constexpr Index cols() const noexcept { return m_condition.cols(); }
+
+  inline EIGEN_DEVICE_FUNC const Scalar coeff(Index i, Index j) const {
+    if (m_condition.coeff(i, j))
+      return m_then.coeff(i, j);
+    else
+      return m_else.coeff(i, j);
+  }
+
+  inline EIGEN_DEVICE_FUNC const Scalar coeff(Index i) const {
+    if (m_condition.coeff(i))
+      return m_then.coeff(i);
+    else
+      return m_else.coeff(i);
+  }
+
+  inline EIGEN_DEVICE_FUNC const ConditionMatrixType& conditionMatrix() const { return m_condition; }
+
+  inline EIGEN_DEVICE_FUNC const ThenMatrixType& thenMatrix() const { return m_then; }
+
+  inline EIGEN_DEVICE_FUNC const ElseMatrixType& elseMatrix() const { return m_else; }
+
+ protected:
+  typename ConditionMatrixType::Nested m_condition;
+  typename ThenMatrixType::Nested m_then;
+  typename ElseMatrixType::Nested m_else;
+};
+
+/** \returns a matrix where each coefficient (i,j) is equal to \a thenMatrix(i,j)
+ * if \c *this(i,j) != Scalar(0), and \a elseMatrix(i,j) otherwise.
+ *
+ * Example: \include MatrixBase_select.cpp
+ * Output: \verbinclude MatrixBase_select.out
+ *
+ * \sa DenseBase::bitwiseSelect(const DenseBase<ThenDerived>&, const DenseBase<ElseDerived>&)
+ */
+template <typename Derived>
+template <typename ThenDerived, typename ElseDerived>
+inline EIGEN_DEVICE_FUNC CwiseTernaryOp<
+    internal::scalar_boolean_select_op<typename DenseBase<ThenDerived>::Scalar, typename DenseBase<ElseDerived>::Scalar,
+                                       typename DenseBase<Derived>::Scalar>,
+    ThenDerived, ElseDerived, Derived>
+DenseBase<Derived>::select(const DenseBase<ThenDerived>& thenMatrix, const DenseBase<ElseDerived>& elseMatrix) const {
+  using Op = internal::scalar_boolean_select_op<typename DenseBase<ThenDerived>::Scalar,
+                                                typename DenseBase<ElseDerived>::Scalar, Scalar>;
+  return CwiseTernaryOp<Op, ThenDerived, ElseDerived, Derived>(thenMatrix.derived(), elseMatrix.derived(), derived(),
+                                                               Op());
+}
+/** Version of DenseBase::select(const DenseBase&, const DenseBase&) with
+ * the \em else expression being a scalar value.
+ *
+ * \sa DenseBase::booleanSelect(const DenseBase<ThenDerived>&, const DenseBase<ElseDerived>&) const, class Select
+ */
+template <typename Derived>
+template <typename ThenDerived>
+inline EIGEN_DEVICE_FUNC CwiseTernaryOp<
+    internal::scalar_boolean_select_op<typename DenseBase<ThenDerived>::Scalar, typename DenseBase<ThenDerived>::Scalar,
+                                       typename DenseBase<Derived>::Scalar>,
+    ThenDerived, typename DenseBase<ThenDerived>::ConstantReturnType, Derived>
+DenseBase<Derived>::select(const DenseBase<ThenDerived>& thenMatrix,
+                           const typename DenseBase<ThenDerived>::Scalar& elseScalar) const {
+  using ElseConstantType = typename DenseBase<ThenDerived>::ConstantReturnType;
+  using Op = internal::scalar_boolean_select_op<typename DenseBase<ThenDerived>::Scalar,
+                                                typename DenseBase<ThenDerived>::Scalar, Scalar>;
+  return CwiseTernaryOp<Op, ThenDerived, ElseConstantType, Derived>(
+      thenMatrix.derived(), ElseConstantType(rows(), cols(), elseScalar), derived(), Op());
+}
+/** Version of DenseBase::select(const DenseBase&, const DenseBase&) with
+ * the \em then expression being a scalar value.
+ *
+ * \sa DenseBase::booleanSelect(const DenseBase<ThenDerived>&, const DenseBase<ElseDerived>&) const, class Select
+ */
+template <typename Derived>
+template <typename ElseDerived>
+inline EIGEN_DEVICE_FUNC CwiseTernaryOp<
+    internal::scalar_boolean_select_op<typename DenseBase<ElseDerived>::Scalar, typename DenseBase<ElseDerived>::Scalar,
+                                       typename DenseBase<Derived>::Scalar>,
+    typename DenseBase<ElseDerived>::ConstantReturnType, ElseDerived, Derived>
+DenseBase<Derived>::select(const typename DenseBase<ElseDerived>::Scalar& thenScalar,
+                           const DenseBase<ElseDerived>& elseMatrix) const {
+  using ThenConstantType = typename DenseBase<ElseDerived>::ConstantReturnType;
+  using Op = internal::scalar_boolean_select_op<typename DenseBase<ElseDerived>::Scalar,
+                                                typename DenseBase<ElseDerived>::Scalar, Scalar>;
+  return CwiseTernaryOp<Op, ThenConstantType, ElseDerived, Derived>(ThenConstantType(rows(), cols(), thenScalar),
+                                                                    elseMatrix.derived(), derived(), Op());
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_SELECT_H

eigen-master/Eigen/src/Core/SelfAdjointView.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_SELFADJOINTMATRIX_H
+#define EIGEN_SELFADJOINTMATRIX_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+/** \class SelfAdjointView
+ * \ingroup Core_Module
+ *
+ *
+ * \brief Expression of a selfadjoint matrix from a triangular part of a dense matrix
+ *
+ * \tparam MatrixType the type of the dense matrix storing the coefficients
+ * \tparam TriangularPart can be either \c #Lower or \c #Upper
+ *
+ * This class is an expression of a sefladjoint matrix from a triangular part of a matrix
+ * with given dense storage of the coefficients. It is the return type of MatrixBase::selfadjointView()
+ * and most of the time this is the only way that it is used.
+ *
+ * \sa class TriangularBase, MatrixBase::selfadjointView()
+ */
+
+namespace internal {
+template <typename MatrixType, unsigned int UpLo>
+struct traits<SelfAdjointView<MatrixType, UpLo> > : traits<MatrixType> {
+  typedef typename ref_selector<MatrixType>::non_const_type MatrixTypeNested;
+  typedef remove_all_t<MatrixTypeNested> MatrixTypeNestedCleaned;
+  typedef MatrixType ExpressionType;
+  typedef typename MatrixType::PlainObject FullMatrixType;
+  enum {
+    Mode = UpLo | SelfAdjoint,
+    FlagsLvalueBit = is_lvalue<MatrixType>::value ? LvalueBit : 0,
+    Flags = MatrixTypeNestedCleaned::Flags & (HereditaryBits | FlagsLvalueBit) &
+            (~(PacketAccessBit | DirectAccessBit | LinearAccessBit))  // FIXME these flags should be preserved
+  };
+};
+}  // namespace internal
+
+template <typename MatrixType_, unsigned int UpLo>
+class SelfAdjointView : public TriangularBase<SelfAdjointView<MatrixType_, UpLo> > {
+ public:
+  EIGEN_STATIC_ASSERT(UpLo == Lower || UpLo == Upper, SELFADJOINTVIEW_ACCEPTS_UPPER_AND_LOWER_MODE_ONLY)
+
+  typedef MatrixType_ MatrixType;
+  typedef TriangularBase<SelfAdjointView> Base;
+  typedef typename internal::traits<SelfAdjointView>::MatrixTypeNested MatrixTypeNested;
+  typedef typename internal::traits<SelfAdjointView>::MatrixTypeNestedCleaned MatrixTypeNestedCleaned;
+  typedef MatrixTypeNestedCleaned NestedExpression;
+
+  /** \brief The type of coefficients in this matrix */
+  typedef typename internal::traits<SelfAdjointView>::Scalar Scalar;
+  typedef typename MatrixType::StorageIndex StorageIndex;
+  typedef internal::remove_all_t<typename MatrixType::ConjugateReturnType> MatrixConjugateReturnType;
+  typedef SelfAdjointView<std::add_const_t<MatrixType>, UpLo> ConstSelfAdjointView;
+
+  enum {
+    Mode = internal::traits<SelfAdjointView>::Mode,
+    Flags = internal::traits<SelfAdjointView>::Flags,
+    TransposeMode = ((int(Mode) & int(Upper)) ? Lower : 0) | ((int(Mode) & int(Lower)) ? Upper : 0)
+  };
+  typedef typename MatrixType::PlainObject PlainObject;
+
+  EIGEN_DEVICE_FUNC explicit inline SelfAdjointView(MatrixType& matrix) : m_matrix(matrix) {}
+
+  EIGEN_DEVICE_FUNC constexpr Index rows() const noexcept { return m_matrix.rows(); }
+  EIGEN_DEVICE_FUNC constexpr Index cols() const noexcept { return m_matrix.cols(); }
+  EIGEN_DEVICE_FUNC constexpr Index outerStride() const noexcept { return m_matrix.outerStride(); }
+  EIGEN_DEVICE_FUNC constexpr Index innerStride() const noexcept { return m_matrix.innerStride(); }
+
+  /** \sa MatrixBase::coeff()
+   * \warning the coordinates must fit into the referenced triangular part
+   */
+  EIGEN_DEVICE_FUNC inline Scalar coeff(Index row, Index col) const {
+    Base::check_coordinates_internal(row, col);
+    return m_matrix.coeff(row, col);
+  }
+
+  /** \sa MatrixBase::coeffRef()
+   * \warning the coordinates must fit into the referenced triangular part
+   */
+  EIGEN_DEVICE_FUNC inline Scalar& coeffRef(Index row, Index col) {
+    EIGEN_STATIC_ASSERT_LVALUE(SelfAdjointView);
+    Base::check_coordinates_internal(row, col);
+    return m_matrix.coeffRef(row, col);
+  }
+
+  /** \internal */
+  EIGEN_DEVICE_FUNC const MatrixTypeNestedCleaned& _expression() const { return m_matrix; }
+
+  EIGEN_DEVICE_FUNC const MatrixTypeNestedCleaned& nestedExpression() const { return m_matrix; }
+  EIGEN_DEVICE_FUNC MatrixTypeNestedCleaned& nestedExpression() { return m_matrix; }
+
+  /** Efficient triangular matrix times vector/matrix product */
+  template <typename OtherDerived>
+  EIGEN_DEVICE_FUNC const Product<SelfAdjointView, OtherDerived> operator*(const MatrixBase<OtherDerived>& rhs) const {
+    return Product<SelfAdjointView, OtherDerived>(*this, rhs.derived());
+  }
+
+  /** Efficient vector/matrix times triangular matrix product */
+  template <typename OtherDerived>
+  friend EIGEN_DEVICE_FUNC const Product<OtherDerived, SelfAdjointView> operator*(const MatrixBase<OtherDerived>& lhs,
+                                                                                  const SelfAdjointView& rhs) {
+    return Product<OtherDerived, SelfAdjointView>(lhs.derived(), rhs);
+  }
+
+  friend EIGEN_DEVICE_FUNC const
+      SelfAdjointView<const EIGEN_SCALAR_BINARYOP_EXPR_RETURN_TYPE(Scalar, MatrixType, product), UpLo>
+      operator*(const Scalar& s, const SelfAdjointView& mat) {
+    return (s * mat.nestedExpression()).template selfadjointView<UpLo>();
+  }
+
+  /** Perform a symmetric rank 2 update of the selfadjoint matrix \c *this:
+   * \f$ this = this + \alpha u v^* + conj(\alpha) v u^* \f$
+   * \returns a reference to \c *this
+   *
+   * The vectors \a u and \c v \b must be column vectors, however they can be
+   * a adjoint expression without any overhead. Only the meaningful triangular
+   * part of the matrix is updated, the rest is left unchanged.
+   *
+   * \sa rankUpdate(const MatrixBase<DerivedU>&, Scalar)
+   */
+  template <typename DerivedU, typename DerivedV>
+  EIGEN_DEVICE_FUNC SelfAdjointView& rankUpdate(const MatrixBase<DerivedU>& u, const MatrixBase<DerivedV>& v,
+                                                const Scalar& alpha = Scalar(1));
+
+  /** Perform a symmetric rank K update of the selfadjoint matrix \c *this:
+   * \f$ this = this + \alpha ( u u^* ) \f$ where \a u is a vector or matrix.
+   *
+   * \returns a reference to \c *this
+   *
+   * Note that to perform \f$ this = this + \alpha ( u^* u ) \f$ you can simply
+   * call this function with u.adjoint().
+   *
+   * \sa rankUpdate(const MatrixBase<DerivedU>&, const MatrixBase<DerivedV>&, Scalar)
+   */
+  template <typename DerivedU>
+  EIGEN_DEVICE_FUNC SelfAdjointView& rankUpdate(const MatrixBase<DerivedU>& u, const Scalar& alpha = Scalar(1));
+
+  /** \returns an expression of a triangular view extracted from the current selfadjoint view of a given triangular part
+   *
+   * The parameter \a TriMode can have the following values: \c #Upper, \c #StrictlyUpper, \c #UnitUpper,
+   * \c #Lower, \c #StrictlyLower, \c #UnitLower.
+   *
+   * If \c TriMode references the same triangular part than \c *this, then this method simply return a \c TriangularView
+   * of the nested expression, otherwise, the nested expression is first transposed, thus returning a \c
+   * TriangularView<Transpose<MatrixType>> object.
+   *
+   * \sa MatrixBase::triangularView(), class TriangularView
+   */
+  template <unsigned int TriMode>
+  EIGEN_DEVICE_FUNC
+      std::conditional_t<(TriMode & (Upper | Lower)) == (UpLo & (Upper | Lower)), TriangularView<MatrixType, TriMode>,
+                         TriangularView<typename MatrixType::AdjointReturnType, TriMode> >
+      triangularView() const {
+    std::conditional_t<(TriMode & (Upper | Lower)) == (UpLo & (Upper | Lower)), MatrixType&,
+                       typename MatrixType::ConstTransposeReturnType>
+        tmp1(m_matrix);
+    std::conditional_t<(TriMode & (Upper | Lower)) == (UpLo & (Upper | Lower)), MatrixType&,
+                       typename MatrixType::AdjointReturnType>
+        tmp2(tmp1);
+    return std::conditional_t<(TriMode & (Upper | Lower)) == (UpLo & (Upper | Lower)),
+                              TriangularView<MatrixType, TriMode>,
+                              TriangularView<typename MatrixType::AdjointReturnType, TriMode> >(tmp2);
+  }
+
+  typedef SelfAdjointView<const MatrixConjugateReturnType, UpLo> ConjugateReturnType;
+  /** \sa MatrixBase::conjugate() const */
+  EIGEN_DEVICE_FUNC inline const ConjugateReturnType conjugate() const {
+    return ConjugateReturnType(m_matrix.conjugate());
+  }
+
+  /** \returns an expression of the complex conjugate of \c *this if Cond==true,
+   *           returns \c *this otherwise.
+   */
+  template <bool Cond>
+  EIGEN_DEVICE_FUNC inline std::conditional_t<Cond, ConjugateReturnType, ConstSelfAdjointView> conjugateIf() const {
+    typedef std::conditional_t<Cond, ConjugateReturnType, ConstSelfAdjointView> ReturnType;
+    return ReturnType(m_matrix.template conjugateIf<Cond>());
+  }
+
+  typedef SelfAdjointView<const typename MatrixType::AdjointReturnType, TransposeMode> AdjointReturnType;
+  /** \sa MatrixBase::adjoint() const */
+  EIGEN_DEVICE_FUNC inline const AdjointReturnType adjoint() const { return AdjointReturnType(m_matrix.adjoint()); }
+
+  typedef SelfAdjointView<typename MatrixType::TransposeReturnType, TransposeMode> TransposeReturnType;
+  /** \sa MatrixBase::transpose() */
+  template <class Dummy = int>
+  EIGEN_DEVICE_FUNC inline TransposeReturnType transpose(
+      std::enable_if_t<Eigen::internal::is_lvalue<MatrixType>::value, Dummy*> = nullptr) {
+    typename MatrixType::TransposeReturnType tmp(m_matrix);
+    return TransposeReturnType(tmp);
+  }
+
+  typedef SelfAdjointView<const typename MatrixType::ConstTransposeReturnType, TransposeMode> ConstTransposeReturnType;
+  /** \sa MatrixBase::transpose() const */
+  EIGEN_DEVICE_FUNC inline const ConstTransposeReturnType transpose() const {
+    return ConstTransposeReturnType(m_matrix.transpose());
+  }
+
+  /** \returns a const expression of the main diagonal of the matrix \c *this
+   *
+   * This method simply returns the diagonal of the nested expression, thus by-passing the SelfAdjointView decorator.
+   *
+   * \sa MatrixBase::diagonal(), class Diagonal */
+  EIGEN_DEVICE_FUNC typename MatrixType::ConstDiagonalReturnType diagonal() const {
+    return typename MatrixType::ConstDiagonalReturnType(m_matrix);
+  }
+
+  /////////// Cholesky module ///////////
+
+  const LLT<PlainObject, UpLo> llt() const;
+  const LDLT<PlainObject, UpLo> ldlt() const;
+
+  /////////// Eigenvalue module ///////////
+
+  /** Real part of #Scalar */
+  typedef typename NumTraits<Scalar>::Real RealScalar;
+  /** Return type of eigenvalues() */
+  typedef Matrix<RealScalar, internal::traits<MatrixType>::ColsAtCompileTime, 1> EigenvaluesReturnType;
+
+  EIGEN_DEVICE_FUNC EigenvaluesReturnType eigenvalues() const;
+  EIGEN_DEVICE_FUNC RealScalar operatorNorm() const;
+
+ protected:
+  MatrixTypeNested m_matrix;
+};
+
+// template<typename OtherDerived, typename MatrixType, unsigned int UpLo>
+// internal::selfadjoint_matrix_product_returntype<OtherDerived,SelfAdjointView<MatrixType,UpLo> >
+// operator*(const MatrixBase<OtherDerived>& lhs, const SelfAdjointView<MatrixType,UpLo>& rhs)
+// {
+//   return internal::matrix_selfadjoint_product_returntype<OtherDerived,SelfAdjointView<MatrixType,UpLo>
+//   >(lhs.derived(),rhs);
+// }
+
+// selfadjoint to dense matrix
+
+namespace internal {
+
+// TODO currently a selfadjoint expression has the form SelfAdjointView<.,.>
+//      in the future selfadjoint-ness should be defined by the expression traits
+//      such that Transpose<SelfAdjointView<.,.> > is valid. (currently TriangularBase::transpose() is overloaded to
+//      make it work)
+template <typename MatrixType, unsigned int Mode>
+struct evaluator_traits<SelfAdjointView<MatrixType, Mode> > {
+  typedef typename storage_kind_to_evaluator_kind<typename MatrixType::StorageKind>::Kind Kind;
+  typedef SelfAdjointShape Shape;
+};
+
+template <int UpLo, int SetOpposite, typename DstEvaluatorTypeT, typename SrcEvaluatorTypeT, typename Functor,
+          int Version>
+class triangular_dense_assignment_kernel<UpLo, SelfAdjoint, SetOpposite, DstEvaluatorTypeT, SrcEvaluatorTypeT, Functor,
+                                         Version>
+    : public generic_dense_assignment_kernel<DstEvaluatorTypeT, SrcEvaluatorTypeT, Functor, Version> {
+ protected:
+  typedef generic_dense_assignment_kernel<DstEvaluatorTypeT, SrcEvaluatorTypeT, Functor, Version> Base;
+  typedef typename Base::DstXprType DstXprType;
+  typedef typename Base::SrcXprType SrcXprType;
+  using Base::m_dst;
+  using Base::m_functor;
+  using Base::m_src;
+
+ public:
+  typedef typename Base::DstEvaluatorType DstEvaluatorType;
+  typedef typename Base::SrcEvaluatorType SrcEvaluatorType;
+  typedef typename Base::Scalar Scalar;
+  typedef typename Base::AssignmentTraits AssignmentTraits;
+
+  EIGEN_DEVICE_FUNC triangular_dense_assignment_kernel(DstEvaluatorType& dst, const SrcEvaluatorType& src,
+                                                       const Functor& func, DstXprType& dstExpr)
+      : Base(dst, src, func, dstExpr) {}
+
+  EIGEN_DEVICE_FUNC void assignCoeff(Index row, Index col) {
+    eigen_internal_assert(row != col);
+    Scalar tmp = m_src.coeff(row, col);
+    m_functor.assignCoeff(m_dst.coeffRef(row, col), tmp);
+    m_functor.assignCoeff(m_dst.coeffRef(col, row), numext::conj(tmp));
+  }
+
+  EIGEN_DEVICE_FUNC void assignDiagonalCoeff(Index id) { Base::assignCoeff(id, id); }
+
+  EIGEN_DEVICE_FUNC void assignOppositeCoeff(Index, Index) { eigen_internal_assert(false && "should never be called"); }
+};
+
+}  // end namespace internal
+
+/***************************************************************************
+ * Implementation of MatrixBase methods
+ ***************************************************************************/
+
+/** This is the const version of MatrixBase::selfadjointView() */
+template <typename Derived>
+template <unsigned int UpLo>
+EIGEN_DEVICE_FUNC typename MatrixBase<Derived>::template ConstSelfAdjointViewReturnType<UpLo>::Type
+MatrixBase<Derived>::selfadjointView() const {
+  return typename ConstSelfAdjointViewReturnType<UpLo>::Type(derived());
+}
+
+/** \returns an expression of a symmetric/self-adjoint view extracted from the upper or lower triangular part of the
+ * current matrix
+ *
+ * The parameter \a UpLo can be either \c #Upper or \c #Lower
+ *
+ * Example: \include MatrixBase_selfadjointView.cpp
+ * Output: \verbinclude MatrixBase_selfadjointView.out
+ *
+ * \sa class SelfAdjointView
+ */
+template <typename Derived>
+template <unsigned int UpLo>
+EIGEN_DEVICE_FUNC typename MatrixBase<Derived>::template SelfAdjointViewReturnType<UpLo>::Type
+MatrixBase<Derived>::selfadjointView() {
+  return typename SelfAdjointViewReturnType<UpLo>::Type(derived());
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_SELFADJOINTMATRIX_H

eigen-master/Eigen/src/Core/SelfCwiseBinaryOp.h

+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_SELFCWISEBINARYOP_H
+#define EIGEN_SELFCWISEBINARYOP_H
+
+// IWYU pragma: private
+#include "./InternalHeaderCheck.h"
+
+namespace Eigen {
+
+// TODO generalize the scalar type of 'other'
+
+template <typename Derived>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& DenseBase<Derived>::operator*=(const Scalar& other) {
+  internal::call_assignment(this->derived(), PlainObject::Constant(rows(), cols(), other),
+                            internal::mul_assign_op<Scalar, Scalar>());
+  return derived();
+}
+
+template <typename Derived>
+EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Derived& DenseBase<Derived>::operator/=(const Scalar& other) {
+  internal::call_assignment(this->derived(), PlainObject::Constant(rows(), cols(), other),
+                            internal::div_assign_op<Scalar, Scalar>());
+  return derived();
+}
+
+}  // end namespace Eigen
+
+#endif  // EIGEN_SELFCWISEBINARYOP_H