@@ -567,6 +567,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct is_rvalue_reference<_Tp&&>
: public true_type { };
+ /// is_member_object_pointer
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_object_pointer)
+ template<typename _Tp>
+ struct is_member_object_pointer
+ : public __bool_constant<__is_member_object_pointer(_Tp)>
+ { };
+#else
template<typename>
struct __is_member_object_pointer_helper
: public false_type { };
@@ -575,11 +582,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct __is_member_object_pointer_helper<_Tp _Cp::*>
: public __not_<is_function<_Tp>>::type { };
- /// is_member_object_pointer
+
template<typename _Tp>
struct is_member_object_pointer
: public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
+#endif
template<typename>
struct __is_member_function_pointer_helper
@@ -3186,9 +3194,17 @@ template <typename _Tp>
inline constexpr bool is_rvalue_reference_v = false;
template <typename _Tp>
inline constexpr bool is_rvalue_reference_v<_Tp&&> = true;
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_object_pointer)
+template <typename _Tp>
+ inline constexpr bool is_member_object_pointer_v =
+ __is_member_object_pointer(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_member_object_pointer_v =
is_member_object_pointer<_Tp>::value;
+#endif
+
template <typename _Tp>
inline constexpr bool is_member_function_pointer_v =
is_member_function_pointer<_Tp>::value;
This patch optimizes the performance of the is_member_object_pointer trait by dispatching to the new __is_member_object_pointer built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_member_object_pointer): Use __is_member_object_pointer built-in trait. (is_member_object_pointer_v): Likewise. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> --- libstdc++-v3/include/std/type_traits | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-)