| Message ID | 20240511090130.248174-4-kmatsui@gcc.gnu.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v26,01/13] libstdc++: Optimize std::is_const compilation performance | expand |
On 11/05/24 02:01 -0700, Ken Matsui wrote: >This patch optimizes the compilation performance of >std::is_unbounded_array by dispatching to the new >__is_unbounded_array built-in trait. OK, thanks. >libstdc++-v3/ChangeLog: > > * include/std/type_traits (is_unbounded_array_v): Use > __is_unbounded_array built-in trait. > >Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> >--- > libstdc++-v3/include/std/type_traits | 5 +++++ > 1 file changed, 5 insertions(+) > >diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits >index ea013b4b7bc..1562757f886 100644 >--- a/libstdc++-v3/include/std/type_traits >+++ b/libstdc++-v3/include/std/type_traits >@@ -3710,11 +3710,16 @@ template<typename _Ret, typename _Fn, typename... _Args> > /// True for a type that is an array of unknown bound. > /// @ingroup variable_templates > /// @since C++20 >+# if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unbounded_array) >+ template<typename _Tp> >+ inline constexpr bool is_unbounded_array_v = __is_unbounded_array(_Tp); >+# else > template<typename _Tp> > inline constexpr bool is_unbounded_array_v = false; > > template<typename _Tp> > inline constexpr bool is_unbounded_array_v<_Tp[]> = true; >+# endif > > /// True for a type that is an array of known bound. > /// @since C++20 >-- >2.44.0 >
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index ea013b4b7bc..1562757f886 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -3710,11 +3710,16 @@ template<typename _Ret, typename _Fn, typename... _Args> /// True for a type that is an array of unknown bound. /// @ingroup variable_templates /// @since C++20 +# if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unbounded_array) + template<typename _Tp> + inline constexpr bool is_unbounded_array_v = __is_unbounded_array(_Tp); +# else template<typename _Tp> inline constexpr bool is_unbounded_array_v = false; template<typename _Tp> inline constexpr bool is_unbounded_array_v<_Tp[]> = true; +# endif /// True for a type that is an array of known bound. /// @since C++20
This patch optimizes the compilation performance of std::is_unbounded_array by dispatching to the new __is_unbounded_array built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_unbounded_array_v): Use __is_unbounded_array built-in trait. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> --- libstdc++-v3/include/std/type_traits | 5 +++++ 1 file changed, 5 insertions(+)