fixed some compiler warnings and errors in visual studio

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402847

dlib/algs.h

@@ -35,6 +35,10 @@
 // Disable warnings about conversion from size_t to unsigned long and long.
 #pragma warning(disable : 4267)
 
+// Disable warnings about conversion from double to float  
+#pragma warning(disable : 4244)
+#pragma warning(disable : 4305)
+
 #endif
 
 #ifdef __BORLANDC__

dlib/matrix/matrix_cholesky.h

@@ -27,7 +27,7 @@ namespace dlib
         typedef typename matrix_exp_type::mem_manager_type mem_manager_type;
         typedef typename matrix_exp_type::layout_type layout_type;
 
-        typedef typename matrix_exp_type::matrix_type matrix_type;
+        typedef matrix<type,0,0,mem_manager_type,layout_type>  matrix_type;
         typedef matrix<type,NR,1,mem_manager_type,layout_type> column_vector_type;
 
         // You have supplied an invalid type of matrix_exp_type.  You have
@@ -49,7 +49,7 @@ namespace dlib
         ) const;
 
         template <typename EXP>
-        const matrix<type,matrix_exp_type::NR,EXP::NC,mem_manager_type,layout_type> solve (
+        const typename EXP::matrix_type solve (
             const matrix_exp<EXP>& B
         ) const;
 
@@ -159,11 +159,7 @@ namespace dlib
 
     template <typename matrix_exp_type>
     template <typename EXP>
-    const matrix<typename matrix_exp_type::type,
-                 matrix_exp_type::NR, 
-                 EXP::NC, 
-                 typename matrix_exp_type::mem_manager_type, 
-                 typename matrix_exp_type::layout_type>   cholesky_decomposition<matrix_exp_type>::
+    const typename EXP::matrix_type cholesky_decomposition<matrix_exp_type>::
     solve(
         const matrix_exp<EXP>& B
     ) const

dlib/matrix/matrix_eigenvalue.h

@@ -478,7 +478,7 @@ namespace dlib
 
         type f = 0.0;
         type tst1 = 0.0;
-        type eps = pow(2.0,-52.0);
+        const type eps = std::numeric_limits<type>::epsilon();
         for (int l = 0; l < n; l++) 
         {
 
@@ -747,7 +747,7 @@ namespace dlib
         int n = nn-1;
         int low = 0;
         int high = nn-1;
-        type eps = pow(2.0,-52.0);
+        const type eps = std::numeric_limits<type>::epsilon();
         type exshift = 0.0;
         type p=0,q=0,r=0,s=0,z=0,t,w,x,y;
 

dlib/matrix/matrix_lu.h

@@ -128,7 +128,7 @@ namespace dlib
             {
                 // Most of the time is spent in the following dot product.
                 const long kmax = std::min(i,j);
-                const double s = rowm(LU,i, kmax)*colm(LUcolj,0,kmax);
+                const type s = rowm(LU,i, kmax)*colm(LUcolj,0,kmax);
 
                 LU(i,j) = LUcolj(i) -= s;
             }
@@ -147,7 +147,7 @@ namespace dlib
                 long k=0;
                 for (k = 0; k < n; k++) 
                 {
-                    double t = LU(p,k); 
+                    type t = LU(p,k); 
                     LU(p,k) = LU(j,k); 
                     LU(j,k) = t;
                 }

dlib/test/matrix_la.cpp

@@ -28,8 +28,8 @@ namespace
 
 // ----------------------------------------------------------------------------------------
 
-    template <typename matrix_type>
-    const typename matrix_type::matrix_type symm(const matrix_type& m) { return m*trans(m); }
+    template <typename mat_type>
+    const matrix<typename mat_type::type> symm(const mat_type& m) { return m*trans(m); }
 
 // ----------------------------------------------------------------------------------------