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From: Ken Matsui <kmatsui@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc(refs/users/kmatsui/heads/is_object)] libstdc++: use new built-in trait __is_reference for std::is_reference Date: Sat, 8 Jul 2023 05:07:25 +0000 (GMT) [thread overview] Message-ID: <20230708050725.B0CBF385842D@sourceware.org> (raw) https://gcc.gnu.org/g:0323195db7017c9960688757e193e114de17bae2 commit 0323195db7017c9960688757e193e114de17bae2 Author: Ken Matsui <kmatsui@gcc.gnu.org> Date: Sat Mar 25 04:23:19 2023 -0700 libstdc++: use new built-in trait __is_reference for std::is_reference This patch gets std::is_reference to dispatch to new built-in trait __is_reference. libstdc++-v3/ChangeLog: * include/std/type_traits (is_reference): Use __is_reference built-in trait. (is_reference_v): Likewise. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> Diff: --- libstdc++-v3/include/std/type_traits | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 0e7a9c9c7f3..2a14df7e5f9 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -639,6 +639,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION // Composite type categories. /// is_reference +#if __has_builtin(__is_reference) + template<typename _Tp> + struct is_reference + : public __bool_constant<__is_reference(_Tp)> + { }; +#else template<typename _Tp> struct is_reference : public false_type @@ -653,6 +659,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION struct is_reference<_Tp&&> : public true_type { }; +#endif /// is_arithmetic template<typename _Tp> @@ -3192,12 +3199,19 @@ template <typename _Tp> inline constexpr bool is_class_v = __is_class(_Tp); template <typename _Tp> inline constexpr bool is_function_v = is_function<_Tp>::value; + +#if __has_builtin(__is_reference) +template <typename _Tp> + inline constexpr bool is_reference_v = __is_reference(_Tp); +#else template <typename _Tp> inline constexpr bool is_reference_v = false; template <typename _Tp> inline constexpr bool is_reference_v<_Tp&> = true; template <typename _Tp> inline constexpr bool is_reference_v<_Tp&&> = true; +#endif + template <typename _Tp> inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; template <typename _Tp>
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