1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03
10
11 // <set>
12
13 // void swap(multiset& c)
14 // noexcept(!allocator_type::propagate_on_container_swap::value ||
15 // __is_nothrow_swappable<allocator_type>::value);
16 //
17 // In C++17, the standard says that swap shall have:
18 // noexcept(allocator_traits<Allocator>::is_always_equal::value &&
19 // noexcept(swap(declval<Compare&>(), declval<Compare&>())));
20
21 // This tests a conforming extension
22
23 #include <set>
24 #include <utility>
25 #include <cassert>
26
27 #include "test_macros.h"
28 #include "MoveOnly.h"
29 #include "test_allocator.h"
30
31 template <class T>
32 struct some_comp
33 {
34 typedef T value_type;
35
some_compsome_comp36 some_comp() {}
some_compsome_comp37 some_comp(const some_comp&) {}
operator ()some_comp38 bool operator()(const T&, const T&) const { return false; }
39 };
40
41 template <class T>
42 struct some_comp2
43 {
44 typedef T value_type;
45
some_comp2some_comp246 some_comp2() {}
some_comp2some_comp247 some_comp2(const some_comp2&) {}
operator ()some_comp248 bool operator()(const T&, const T&) const { return false; }
49 };
50
51 #if TEST_STD_VER >= 14
52 template <typename T>
swap(some_comp2<T> &,some_comp2<T> &)53 void swap(some_comp2<T>&, some_comp2<T>&) noexcept {}
54 #endif
55
56 template <class T>
57 struct some_alloc
58 {
59 typedef T value_type;
60
some_allocsome_alloc61 some_alloc() {}
62 some_alloc(const some_alloc&);
deallocatesome_alloc63 void deallocate(void*, unsigned) {}
64
65 typedef std::true_type propagate_on_container_swap;
66 };
67
68 template <class T>
69 struct some_alloc2
70 {
71 typedef T value_type;
72
some_alloc2some_alloc273 some_alloc2() {}
74 some_alloc2(const some_alloc2&);
deallocatesome_alloc275 void deallocate(void*, unsigned) {}
76
77 typedef std::false_type propagate_on_container_swap;
78 typedef std::true_type is_always_equal;
79 };
80
81 template <class T>
82 struct some_alloc3
83 {
84 typedef T value_type;
85
some_alloc3some_alloc386 some_alloc3() {}
87 some_alloc3(const some_alloc3&);
deallocatesome_alloc388 void deallocate(void*, unsigned) {}
89
90 typedef std::false_type propagate_on_container_swap;
91 typedef std::false_type is_always_equal;
92 };
93
main(int,char **)94 int main(int, char**)
95 {
96 {
97 typedef std::multiset<MoveOnly> C;
98 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
99 }
100 #if defined(_LIBCPP_VERSION)
101 {
102 typedef std::multiset<MoveOnly, std::less<MoveOnly>, test_allocator<MoveOnly>> C;
103 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
104 }
105 {
106 typedef std::multiset<MoveOnly, std::less<MoveOnly>, other_allocator<MoveOnly>> C;
107 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
108 }
109 #endif // _LIBCPP_VERSION
110 {
111 typedef std::multiset<MoveOnly, some_comp<MoveOnly>> C;
112 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
113 }
114
115 #if TEST_STD_VER >= 14
116 { // POCS allocator, throwable swap for comp
117 typedef std::multiset<MoveOnly, some_comp <MoveOnly>, some_alloc <MoveOnly>> C;
118 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
119 }
120 { // always equal allocator, throwable swap for comp
121 typedef std::multiset<MoveOnly, some_comp <MoveOnly>, some_alloc2<MoveOnly>> C;
122 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
123 }
124 { // POCS allocator, nothrow swap for comp
125 typedef std::multiset<MoveOnly, some_comp2<MoveOnly>, some_alloc <MoveOnly>> C;
126 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
127 }
128 { // always equal allocator, nothrow swap for comp
129 typedef std::multiset<MoveOnly, some_comp2<MoveOnly>, some_alloc2<MoveOnly>> C;
130 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
131 }
132 #if defined(_LIBCPP_VERSION)
133 { // NOT always equal allocator, nothrow swap for comp
134 typedef std::multiset<MoveOnly, some_comp2<MoveOnly>, some_alloc3<MoveOnly>> C;
135 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
136 }
137 #endif // _LIBCPP_VERSION
138 #endif
139
140 return 0;
141 }
142