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a945c346 | 1 | // Copyright (C) 2020-2024 Free Software Foundation, Inc. |
87841658 JW |
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 | ||
762baaf0 | 18 | // { dg-do compile { target c++20 } } |
87841658 JW |
19 | |
20 | #include <iterator> | |
21 | #include <vector> | |
22 | #include <testsuite_allocator.h> | |
23 | ||
24 | void | |
25 | test01() | |
26 | { | |
27 | using V = std::vector<int>; | |
28 | static_assert( std::totally_ordered<V::iterator> ); | |
29 | static_assert( std::three_way_comparable<V::iterator> ); | |
30 | using C = std::compare_three_way_result_t<V::iterator>; | |
31 | static_assert( std::same_as<C, std::strong_ordering> ); | |
32 | ||
33 | static_assert( std::random_access_iterator<V::iterator> ); | |
34 | static_assert( std::random_access_iterator<V::const_iterator> ); | |
35 | } | |
36 | ||
37 | // User-defined pointer type that supports operator< but not operator<=> | |
38 | template<typename T> | |
39 | struct Pointer : __gnu_test::PointerBase<Pointer<T>, T> | |
40 | { | |
41 | using __gnu_test::PointerBase<Pointer<T>, T>::PointerBase; | |
42 | ||
43 | friend bool operator<(const Pointer& lhs, const Pointer& rhs) noexcept | |
44 | { return lhs.value < rhs.value; } | |
45 | ||
46 | std::partial_ordering operator<=>(const Pointer&) const = delete; | |
47 | }; | |
48 | ||
49 | // Minimal allocator using Pointer<T> | |
50 | template<typename T> | |
51 | struct Alloc | |
52 | { | |
53 | typedef T value_type; | |
54 | typedef Pointer<T> pointer; | |
55 | ||
56 | Alloc() = default; | |
57 | template<typename U> | |
58 | Alloc(const Alloc<U>&) { } | |
59 | ||
60 | pointer allocate(std::size_t n) | |
61 | { return pointer(std::allocator<T>().allocate(n)); } | |
62 | ||
63 | void deallocate(pointer p, std::size_t n) | |
64 | { std::allocator<T>().deallocate(p.operator->(), n); } | |
65 | }; | |
66 | ||
67 | void | |
68 | test02() | |
69 | { | |
70 | using V = std::vector<int, Alloc<int>>; | |
71 | static_assert( std::totally_ordered<V::iterator> ); | |
72 | static_assert( std::three_way_comparable<V::iterator> ); | |
73 | using C = std::compare_three_way_result_t<V::iterator>; | |
74 | static_assert( std::same_as<C, std::weak_ordering> ); | |
75 | ||
76 | static_assert( std::random_access_iterator<V::iterator> ); | |
77 | static_assert( std::random_access_iterator<V::const_iterator> ); | |
78 | } | |
79 | ||
80 | void | |
81 | test03() | |
82 | { | |
83 | struct P : Pointer<int> { | |
84 | bool operator<(const P&) const = delete; | |
85 | }; | |
86 | ||
87 | struct C { | |
88 | using pointer = P; | |
89 | }; | |
90 | ||
91 | using I = __gnu_cxx::__normal_iterator<P, C>; | |
92 | static_assert( ! std::totally_ordered<I> ); | |
93 | static_assert( ! std::three_way_comparable<I> ); | |
94 | } |