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a945c346 | 1 | // Copyright (C) 2012-2024 Free Software Foundation, Inc. |
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2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
52066eae | 18 | // { dg-do compile { target c++11 } } |
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19 | |
20 | // libstdc++/52591 | |
21 | ||
22 | #include <vector> | |
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23 | #include <memory> |
24 | #include <type_traits> | |
ea2c1a6d | 25 | |
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26 | // Move-assignment of std::vector<T> is allowed for non-MoveAssignable T when |
27 | // the allocator type propagates. As an extension we also allow it if the | |
28 | // allocator type is known to always compare equal. | |
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29 | |
30 | struct C | |
31 | { | |
32 | C& operator=(C&&) = delete; | |
33 | }; | |
34 | ||
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35 | void test01() |
36 | { | |
37 | std::vector<C> a; | |
38 | a = std::vector<C>(); | |
39 | } | |
40 | ||
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41 | template<typename T> |
42 | struct A1 : std::allocator<T> | |
43 | { | |
44 | template<typename U> struct rebind { typedef A1<U> other; }; | |
45 | ||
46 | A1() = default; | |
47 | template<typename U> A1(const A1<U>&) { } | |
48 | ||
49 | using propagate_on_container_move_assignment = std::true_type; | |
9425300b | 50 | using is_always_equal = std::false_type; |
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51 | }; |
52 | ||
9425300b | 53 | void test02() |
ea2c1a6d | 54 | { |
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55 | using test_type = std::vector<C, A1<C>>; |
56 | static_assert(std::is_nothrow_move_assignable<test_type>::value, | |
57 | "vector is nothrow move-assignable if allocator propagates"); | |
58 | } | |
59 | ||
60 | template<typename T> | |
61 | struct A2 : std::allocator<T> | |
62 | { | |
64c986b4 | 63 | template<typename U> struct rebind { typedef A2<U> other; }; |
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64 | |
65 | A2() = default; | |
66 | template<typename U> A2(const A2<U>&) { } | |
67 | ||
68 | using propagate_on_container_move_assignment = std::false_type; | |
a2b5fdcb | 69 | using is_always_equal = std::true_type; |
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70 | }; |
71 | ||
9425300b | 72 | void test03() |
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73 | { |
74 | using test_type = std::vector<C, A2<C>>; | |
75 | static_assert(std::is_nothrow_move_assignable<test_type>::value, | |
76 | "vector is nothrow move-assignable if allocator is always equal"); | |
ea2c1a6d | 77 | } |