| // Copyright (C) 2012-2023 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-do compile { target c++11 } } |
| |
| // libstdc++/52591 |
| |
| #include <vector> |
| #include <memory> |
| #include <type_traits> |
| |
| // Move-assignment of std::vector<T> is allowed for non-MoveAssignable T when |
| // the allocator type propagates. As an extension we also allow it if the |
| // allocator type is known to always compare equal. |
| |
| struct C |
| { |
| C& operator=(C&&) = delete; |
| }; |
| |
| void test01() |
| { |
| std::vector<C> a; |
| a = std::vector<C>(); |
| } |
| |
| template<typename T> |
| struct A1 : std::allocator<T> |
| { |
| template<typename U> struct rebind { typedef A1<U> other; }; |
| |
| A1() = default; |
| template<typename U> A1(const A1<U>&) { } |
| |
| using propagate_on_container_move_assignment = std::true_type; |
| using is_always_equal = std::false_type; |
| }; |
| |
| void test02() |
| { |
| using test_type = std::vector<C, A1<C>>; |
| static_assert(std::is_nothrow_move_assignable<test_type>::value, |
| "vector is nothrow move-assignable if allocator propagates"); |
| } |
| |
| template<typename T> |
| struct A2 : std::allocator<T> |
| { |
| template<typename U> struct rebind { typedef A2<U> other; }; |
| |
| A2() = default; |
| template<typename U> A2(const A2<U>&) { } |
| |
| using propagate_on_container_move_assignment = std::false_type; |
| using is_always_equal = std::true_type; |
| }; |
| |
| void test03() |
| { |
| using test_type = std::vector<C, A2<C>>; |
| static_assert(std::is_nothrow_move_assignable<test_type>::value, |
| "vector is nothrow move-assignable if allocator is always equal"); |
| } |