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From: Jonathan Wakely <redi@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r13-3067] libstdc++: Use new built-ins __remove_cv, __remove_reference etc. Date: Tue, 4 Oct 2022 16:46:08 +0000 (GMT) [thread overview] Message-ID: <20221004164608.458FE3858D37@sourceware.org> (raw) https://gcc.gnu.org/g:6ddbbbffbb5759a6c1d56c191364a6bd021f733e commit r13-3067-g6ddbbbffbb5759a6c1d56c191364a6bd021f733e Author: Jonathan Wakely <jwakely@redhat.com> Date: Tue Oct 4 13:00:52 2022 +0100 libstdc++: Use new built-ins __remove_cv, __remove_reference etc. libstdc++-v3/ChangeLog: * include/std/type_traits (remove_cv): Use __remove_cv built-in. (remove_reference): Use __remove_reference built-in. (remove_cvref): Use __remove_cvref built-in. Remove inheritance for fallback implementation. Diff: --- libstdc++-v3/include/std/type_traits | 33 ++++++++++++++++++++++++--------- 1 file changed, 24 insertions(+), 9 deletions(-) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index a015fd95a71..b74565eb521 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -1507,6 +1507,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { typedef _Tp type; }; /// remove_cv +#if __has_builtin(__remove_cv) + template<typename _Tp> + struct remove_cv + { using type = __remove_cv(_Tp); }; +#else template<typename _Tp> struct remove_cv { using type = _Tp; }; @@ -1522,6 +1527,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Tp> struct remove_cv<const volatile _Tp> { using type = _Tp; }; +#endif /// add_const template<typename _Tp> @@ -1570,17 +1576,23 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION // Reference transformations. /// remove_reference +#if __has_builtin(__remove_reference) template<typename _Tp> struct remove_reference - { typedef _Tp type; }; + { using type = __remove_reference(_Tp); }; +#else + template<typename _Tp> + struct remove_reference + { using type = _Tp; }; template<typename _Tp> struct remove_reference<_Tp&> - { typedef _Tp type; }; + { using type = _Tp; }; template<typename _Tp> struct remove_reference<_Tp&&> - { typedef _Tp type; }; + { using type = _Tp; }; +#endif /// add_lvalue_reference template<typename _Tp> @@ -3358,20 +3370,23 @@ template<typename _Ret, typename _Fn, typename... _Args> */ #define __cpp_lib_remove_cvref 201711L +#if __has_builtin(__remove_cvref) template<typename _Tp> struct remove_cvref - : remove_cv<_Tp> - { }; + { using type = __remove_cvref(_Tp); }; +#else + template<typename _Tp> + struct remove_cvref + { using type = typename remove_cv<_Tp>::type; }; template<typename _Tp> struct remove_cvref<_Tp&> - : remove_cv<_Tp> - { }; + { using type = typename remove_cv<_Tp>::type; }; template<typename _Tp> struct remove_cvref<_Tp&&> - : remove_cv<_Tp> - { }; + { using type = typename remove_cv<_Tp>::type; }; +#endif template<typename _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type;
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