Mercurial > hg > CbC > CbC_gcc
view libstdc++-v3/testsuite/24_iterators/aliases.cc @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
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// Copyright (C) 2020 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING3. If not see // <http://www.gnu.org/licenses/>. // { dg-options "-std=gnu++2a" } // { dg-do compile { target c++2a } } #include <iterator> template<typename T> struct Dereferenceable { T operator*(); }; template<typename T> concept has_iter_reference = requires { typename std::iter_reference_t<T>; }; template<typename T, typename U> concept is_iter_reference_for = has_iter_reference<U> && std::same_as<T, std::iter_reference_t<U>>; static_assert(!has_iter_reference<Dereferenceable<void>>); static_assert(is_iter_reference_for<int, Dereferenceable<int>>); static_assert(is_iter_reference_for<int&, Dereferenceable<int&>>); static_assert(is_iter_reference_for<int&&, Dereferenceable<int&&>>); static_assert(is_iter_reference_for<int&, int*>); static_assert(is_iter_reference_for<const int&, const int*>); template<typename T> concept has_iter_rvalue_reference = requires { typename std::iter_rvalue_reference_t<T>; }; template<typename T, typename U> concept is_iter_rvalue_reference_for = has_iter_rvalue_reference<U> && std::same_as<T, std::iter_rvalue_reference_t<U>>; static_assert(!has_iter_rvalue_reference<Dereferenceable<void>>); static_assert(is_iter_rvalue_reference_for<int, Dereferenceable<int>>); static_assert(is_iter_rvalue_reference_for<int&&, Dereferenceable<int&>>); static_assert(is_iter_rvalue_reference_for<int&&, Dereferenceable<int&&>>); static_assert(is_iter_rvalue_reference_for<int&&, int*>); static_assert(is_iter_rvalue_reference_for<const int&&, const int*>); // These functions should be found by ADL. std::move is not applied to result. long iter_move(Dereferenceable<short>); long& iter_move(Dereferenceable<short&&>); static_assert(is_iter_rvalue_reference_for<long, Dereferenceable<short>>); static_assert(is_iter_rvalue_reference_for<long&, Dereferenceable<short&&>>);