| // Copyright (C) 2020-2021 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&&>>); |