Googletest export

Remove bool_constant in favor of std::integral_constant<bool, ...>;
The one non-trivial use of bool_constant has been changed to have significantly
fewer template specializations.

PiperOrigin-RevId: 275842490

googlemock/include/gmock/gmock-matchers.h

@@ -142,7 +142,7 @@ class MatcherCastImpl {
   template <bool Ignore>
   static Matcher<T> CastImpl(const M& polymorphic_matcher_or_value,
                              std::true_type /* convertible_to_matcher */,
-                             bool_constant<Ignore>) {
+                             std::integral_constant<bool, Ignore>) {
     // M is implicitly convertible to Matcher<T>, which means that either
     // M is a polymorphic matcher or Matcher<T> has an implicit constructor
     // from M.  In both cases using the implicit conversion will produce a

googlemock/include/gmock/internal/gmock-internal-utils.h

@@ -157,9 +157,6 @@ GMOCK_DECLARE_KIND_(long double, kFloatingPoint);
   static_cast< ::testing::internal::TypeKind>( \
       ::testing::internal::KindOf<type>::value)
 
-// Evaluates to true if and only if integer type T is signed.
-#define GMOCK_IS_SIGNED_(T) (static_cast<T>(-1) < 0)
-
 // LosslessArithmeticConvertibleImpl<kFromKind, From, kToKind, To>::value
 // is true if and only if arithmetic type From can be losslessly converted to
 // arithmetic type To.
@@ -170,65 +167,30 @@ GMOCK_DECLARE_KIND_(long double, kFloatingPoint);
 // From, and kToKind is the kind of To; the value is
 // implementation-defined when the above pre-condition is violated.
 template <TypeKind kFromKind, typename From, TypeKind kToKind, typename To>
-struct LosslessArithmeticConvertibleImpl : public std::false_type {};
-
-// Converting bool to bool is lossless.
-template <>
-struct LosslessArithmeticConvertibleImpl<kBool, bool, kBool, bool>
-    : public std::true_type {};
-
-// Converting bool to any integer type is lossless.
-template <typename To>
-struct LosslessArithmeticConvertibleImpl<kBool, bool, kInteger, To>
-    : public std::true_type {};
-
-// Converting bool to any floating-point type is lossless.
-template <typename To>
-struct LosslessArithmeticConvertibleImpl<kBool, bool, kFloatingPoint, To>
-    : public std::true_type {};
-
-// Converting an integer to bool is lossy.
-template <typename From>
-struct LosslessArithmeticConvertibleImpl<kInteger, From, kBool, bool>
-    : public std::false_type {};
-
-// Converting an integer to another non-bool integer is lossless
-// if and only if the target type's range encloses the source type's range.
-template <typename From, typename To>
-struct LosslessArithmeticConvertibleImpl<kInteger, From, kInteger, To>
-    : public bool_constant<
-      // When converting from a smaller size to a larger size, we are
-      // fine as long as we are not converting from signed to unsigned.
-      ((sizeof(From) < sizeof(To)) &&
-       (!GMOCK_IS_SIGNED_(From) || GMOCK_IS_SIGNED_(To))) ||
-      // When converting between the same size, the signedness must match.
+using LosslessArithmeticConvertibleImpl = std::integral_constant<
+    bool,
+    // clang-format off
+      // Converting from bool is always lossless
+      (kFromKind == kBool) ? true
+      // Converting between any other type kinds will be lossy if the type
+      // kinds are not the same.
+    : (kFromKind != kToKind) ? false
+    : (kFromKind == kInteger &&
+       // Converting between integers of different widths is allowed so long
+       // as the conversion does not go from signed to unsigned.
+      (((sizeof(From) < sizeof(To)) &&
+        !(std::is_signed<From>::value && !std::is_signed<To>::value)) ||
+       // Converting between integers of the same width only requires the
+       // two types to have the same signedness.
        ((sizeof(From) == sizeof(To)) &&
-       (GMOCK_IS_SIGNED_(From) == GMOCK_IS_SIGNED_(To)))> {};  // NOLINT
-
-#undef GMOCK_IS_SIGNED_
-
-// Converting an integer to a floating-point type may be lossy, since
-// the format of a floating-point number is implementation-defined.
-template <typename From, typename To>
-struct LosslessArithmeticConvertibleImpl<kInteger, From, kFloatingPoint, To>
-    : public std::false_type {};
-
-// Converting a floating-point to bool is lossy.
-template <typename From>
-struct LosslessArithmeticConvertibleImpl<kFloatingPoint, From, kBool, bool>
-    : public std::false_type {};
-
-// Converting a floating-point to an integer is lossy.
-template <typename From, typename To>
-struct LosslessArithmeticConvertibleImpl<kFloatingPoint, From, kInteger, To>
-    : public std::false_type {};
-
-// Converting a floating-point to another floating-point is lossless
-// if and only if the target type is at least as big as the source type.
-template <typename From, typename To>
-struct LosslessArithmeticConvertibleImpl<
-  kFloatingPoint, From, kFloatingPoint, To>
-    : public bool_constant<sizeof(From) <= sizeof(To)> {};  // NOLINT
+        (std::is_signed<From>::value == std::is_signed<To>::value)))
+       ) ? true
+      // Floating point conversions are lossless if and only if `To` is at least
+      // as wide as `From`.
+    : (kFromKind == kFloatingPoint && (sizeof(From) <= sizeof(To))) ? true
+    : false
+    // clang-format on
+    >;
 
 // LosslessArithmeticConvertible<From, To>::value is true if and only if
 // arithmetic type From can be losslessly converted to arithmetic type To.
@@ -238,9 +200,9 @@ struct LosslessArithmeticConvertibleImpl<
 // reference) built-in arithmetic types; the value is
 // implementation-defined when the above pre-condition is violated.
 template <typename From, typename To>
-struct LosslessArithmeticConvertible
-    : public LosslessArithmeticConvertibleImpl<
-  GMOCK_KIND_OF_(From), From, GMOCK_KIND_OF_(To), To> {};  // NOLINT
+using LosslessArithmeticConvertible =
+    LosslessArithmeticConvertibleImpl<GMOCK_KIND_OF_(From), From,
+                                      GMOCK_KIND_OF_(To), To>;
 
 // This interface knows how to report a Google Mock failure (either
 // non-fatal or fatal).

googletest/include/gtest/internal/gtest-internal.h

@@ -855,8 +855,7 @@ class GTEST_API_ Random {
 // true if and only if T is type proto2::Message or a subclass of it.
 template <typename T>
 struct IsAProtocolMessage
-    : public bool_constant<
-          std::is_convertible<const T*, const ::proto2::Message*>::value> {};
+    : public std::is_convertible<const T*, const ::proto2::Message*> {};
 
 // When the compiler sees expression IsContainerTest<C>(0), if C is an
 // STL-style container class, the first overload of IsContainerTest

googletest/include/gtest/internal/gtest-port.h

@@ -1875,9 +1875,6 @@ class GTEST_API_ ThreadLocal {
 // we cannot detect it.
 GTEST_API_ size_t GetThreadCount();
 
-template <bool B>
-using bool_constant = std::integral_constant<bool, B>;
-
 #if GTEST_OS_WINDOWS
 # define GTEST_PATH_SEP_ "\\"
 # define GTEST_HAS_ALT_PATH_SEP_ 1