[2/2] libstdc++: Optimize is_member_function_pointer trait performance
Checks
Commit Message
This patch optimizes the performance of the is_member_function_pointer trait
by dispatching to the new __is_member_function_pointer built-in trait.
libstdc++-v3/ChangeLog:
* include/std/type_traits (is_member_function_pointer): Use
__is_member_function_pointer built-in trait.
(is_member_function_pointer_v): Likewise.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
libstdc++-v3/include/std/type_traits | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
@@ -581,6 +581,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer)
+ /// is_member_function_pointer
+ template<typename _Tp>
+ struct is_member_function_pointer
+ : public __bool_constant<__is_member_function_pointer(_Tp)>
+ { };
+#else
template<typename>
struct __is_member_function_pointer_helper
: public false_type { };
@@ -594,6 +601,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct is_member_function_pointer
: public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
+#endif
/// is_enum
template<typename _Tp>
@@ -3189,9 +3197,17 @@ template <typename _Tp>
template <typename _Tp>
inline constexpr bool is_member_object_pointer_v =
is_member_object_pointer<_Tp>::value;
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer)
+template <typename _Tp>
+ inline constexpr bool is_member_function_pointer_v =
+ __is_member_function_pointer(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_member_function_pointer_v =
is_member_function_pointer<_Tp>::value;
+#endif
+
template <typename _Tp>
inline constexpr bool is_enum_v = __is_enum(_Tp);
template <typename _Tp>