@@ -3494,11 +3494,16 @@ template<typename _Ret, typename _Fn, typename... _Args>
/// True for a type that is an array of known bound.
/// @ingroup variable_templates
/// @since C++20
+# if _GLIBCXX_USE_BUILTIN_TRAIT(__is_bounded_array)
+ template<typename _Tp>
+ inline constexpr bool is_bounded_array_v = __is_bounded_array(_Tp);
+# else
template<typename _Tp>
inline constexpr bool is_bounded_array_v = false;
template<typename _Tp, size_t _Size>
inline constexpr bool is_bounded_array_v<_Tp[_Size]> = true;
+# endif
/// True for a type that is an array of unknown bound.
/// @ingroup variable_templates
This patch optimizes the performance of the is_bounded_array trait by dispatching to the new __is_bounded_array built-in trait. libstdc++-v3/ChangeLog: * include/std/type_traits (is_bounded_array_v): Use __is_bounded_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(+)