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 <kmat...@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 6407738a726..c4585a23df9 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -3706,11 +3706,16 @@ 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
--
2.43.2
