Message ID | 20231013211206.1215663-22-kmatsui@gcc.gnu.org |
---|---|
State | Unresolved |
Headers |
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Series |
Optimize type traits performance
|
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Checks
Context | Check | Description |
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snail/gcc-patch-check | warning | Git am fail log |
Commit Message
Ken Matsui
Oct. 13, 2023, 9:04 p.m. UTC
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 | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index e1b10240dc2..792213ebfe8 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -574,6 +574,13 @@ _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 { }; @@ -582,11 +589,12 @@ _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 #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer) /// is_member_function_pointer @@ -3227,9 +3235,16 @@ 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 #if _GLIBCXX_USE_BUILTIN_TRAIT(__is_member_function_pointer) template <typename _Tp>