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From: Jonathan Wakely <redi@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r11-9303] libstdc++: Simplify constraints for std::any construction Date: Wed, 24 Nov 2021 11:52:30 +0000 (GMT) [thread overview] Message-ID: <20211124115230.080A93857C44@sourceware.org> (raw) https://gcc.gnu.org/g:853b9d54365372e0926746ff939004389a8742aa commit r11-9303-g853b9d54365372e0926746ff939004389a8742aa Author: Jonathan Wakely <jwakely@redhat.com> Date: Mon Oct 4 23:14:30 2021 +0100 libstdc++: Simplify constraints for std::any construction libstdc++-v3/ChangeLog: * include/std/utility (__is_in_place_type_v): Define variable template to detect in_place_type_t specializations. (__is_in_place_type): Replace class template with alias template using __is_in_place_type_v. * include/std/any (any(T&&)): Check __is_in_place_type first and avoid instantiating is_copy_constructible unnecessarily. (cherry picked from commit 6da36b7d0e43b6f9281c65c19a025d4888a25b2d) Diff: --- libstdc++-v3/include/std/any | 4 ++-- libstdc++-v3/include/std/utility | 10 +++------- 2 files changed, 5 insertions(+), 9 deletions(-) diff --git a/libstdc++-v3/include/std/any b/libstdc++-v3/include/std/any index aae2b731d42..d96ea06c1ae 100644 --- a/libstdc++-v3/include/std/any +++ b/libstdc++-v3/include/std/any @@ -184,8 +184,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION /// Construct with a copy of @p __value as the contained object. template <typename _Tp, typename _VTp = _Decay_if_not_any<_Tp>, typename _Mgr = _Manager<_VTp>, - enable_if_t<is_copy_constructible<_VTp>::value - && !__is_in_place_type<_VTp>::value, bool> = true> + typename = _Require<__not_<__is_in_place_type<_VTp>>, + is_copy_constructible<_VTp>>> any(_Tp&& __value) : _M_manager(&_Mgr::_S_manage) { diff --git a/libstdc++-v3/include/std/utility b/libstdc++-v3/include/std/utility index 3e68f682e00..f54f75b4d38 100644 --- a/libstdc++-v3/include/std/utility +++ b/libstdc++-v3/include/std/utility @@ -372,17 +372,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION inline constexpr in_place_index_t<_Idx> in_place_index{}; template<typename> - struct __is_in_place_type_impl : false_type - { }; + inline constexpr bool __is_in_place_type_v = false; template<typename _Tp> - struct __is_in_place_type_impl<in_place_type_t<_Tp>> : true_type - { }; + inline constexpr bool __is_in_place_type_v<in_place_type_t<_Tp>> = true; template<typename _Tp> - struct __is_in_place_type - : public __is_in_place_type_impl<_Tp> - { }; + using __is_in_place_type = bool_constant<__is_in_place_type_v<_Tp>>; #define __cpp_lib_as_const 201510 template<typename _Tp>
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