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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_signed)] libstdc++: use new built-in trait __is_signed Date: Sun, 9 Jul 2023 08:50:30 +0000 (GMT) [thread overview] Message-ID: <20230709085030.40229386C4AD@sourceware.org> (raw) https://gcc.gnu.org/g:8e56cfff36415b33a5a580f65518865e70e49688 commit 8e56cfff36415b33a5a580f65518865e70e49688 Author: Ken Matsui <kmatsui@gcc.gnu.org> Date: Tue Mar 21 08:44:32 2023 -0700 libstdc++: use new built-in trait __is_signed This patch lets libstdc++ use new built-in trait __is_signed. libstdc++-v3/ChangeLog: * include/std/type_traits (is_signed): Use __is_signed built-in trait. (is_signed_v): Likewise. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> Diff: --- libstdc++-v3/include/std/type_traits | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index 0e7a9c9c7f3..23ab5a4b1e5 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -865,6 +865,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION : public __bool_constant<__is_abstract(_Tp)> { }; + /// is_signed +#if __has_builtin(__is_signed) + template<typename _Tp> + struct is_signed + : public __bool_constant<__is_signed(_Tp)> + { }; +#else /// @cond undocumented template<typename _Tp, bool = is_arithmetic<_Tp>::value> @@ -877,11 +884,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { }; /// @endcond - /// is_signed template<typename _Tp> struct is_signed : public __is_signed_helper<_Tp>::type { }; +#endif /// is_unsigned template<typename _Tp> @@ -3240,8 +3247,14 @@ template <typename _Tp> template <typename _Tp> inline constexpr bool is_final_v = __is_final(_Tp); +#if __has_builtin(__is_signed) +template <typename _Tp> + inline constexpr bool is_signed_v = __is_signed(_Tp); +#else template <typename _Tp> inline constexpr bool is_signed_v = is_signed<_Tp>::value; +#endif + template <typename _Tp> inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
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