@@ -709,6 +709,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct is_compound
: public __not_<is_fundamental<_Tp>>::type { };
+ /// is_member_pointer
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer)
+ template<typename _Tp>
+ struct is_member_pointer
+ : public __bool_constant<__is_member_pointer(_Tp)>
+ { };
+#else
/// @cond undocumented
template<typename _Tp>
struct __is_member_pointer_helper
@@ -719,11 +726,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
: public true_type { };
/// @endcond
- /// is_member_pointer
template<typename _Tp>
struct is_member_pointer
: public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type
{ };
+#endif
template<typename, typename>
struct is_same;
@@ -3216,8 +3223,15 @@ template <typename _Tp>
inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
template <typename _Tp>
inline constexpr bool is_compound_v = is_compound<_Tp>::value;
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_pointer)
+template <typename _Tp>
+ inline constexpr bool is_member_pointer_v = __is_member_pointer(_Tp);
+#else
template <typename _Tp>
inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
+#endif
+
template <typename _Tp>
inline constexpr bool is_const_v = false;
template <typename _Tp>
This patch optimizes the performance of the is_member_pointer trait by dispatching to the new __is_member_pointer built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_member_pointer): Use __is_member_pointer built-in trait. (is_member_pointer_v): Likewise. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> --- libstdc++-v3/include/std/type_traits | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-)