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 // <unordered_set>
12
13 // void swap(unordered_set& c)
14 // noexcept(
15 // (!allocator_type::propagate_on_container_swap::value ||
16 // __is_nothrow_swappable<allocator_type>::value) &&
17 // __is_nothrow_swappable<hasher>::value &&
18 // __is_nothrow_swappable<key_equal>::value);
19 //
20 // In C++17, the standard says that swap shall have:
21 // noexcept(allocator_traits<Allocator>::is_always_equal::value &&
22 // noexcept(swap(declval<Hash&>(), declval<Hash&>())) &&
23 // noexcept(swap(declval<Pred&>(), declval<Pred&>())));
24
25 // This tests a conforming extension
26
27 #include <unordered_set>
28 #include <utility>
29 #include <cassert>
30
31 #include "test_macros.h"
32 #include "MoveOnly.h"
33 #include "test_allocator.h"
34
35 template <class T>
36 struct some_comp
37 {
38 typedef T value_type;
39
some_compsome_comp40 some_comp() {}
some_compsome_comp41 some_comp(const some_comp&) {}
operator ()some_comp42 bool operator()(const T&, const T&) const { return false; }
43 };
44
45 template <class T>
46 struct some_comp2
47 {
48 typedef T value_type;
49
some_comp2some_comp250 some_comp2() {}
some_comp2some_comp251 some_comp2(const some_comp2&) {}
operator ()some_comp252 bool operator()(const T&, const T&) const { return false; }
53 };
54
55 #if TEST_STD_VER >= 14
56 template <typename T>
swap(some_comp2<T> &,some_comp2<T> &)57 void swap(some_comp2<T>&, some_comp2<T>&) noexcept {}
58 #endif
59
60 template <class T>
61 struct some_hash
62 {
63 typedef T value_type;
some_hashsome_hash64 some_hash() {}
65 some_hash(const some_hash&);
operator ()some_hash66 std::size_t operator()(const T&) const { return 0; }
67 };
68
69 template <class T>
70 struct some_hash2
71 {
72 typedef T value_type;
some_hash2some_hash273 some_hash2() {}
74 some_hash2(const some_hash2&);
operator ()some_hash275 std::size_t operator()(const T&) const { return 0; }
76 };
77
78 #if TEST_STD_VER >= 14
79 template <typename T>
swap(some_hash2<T> &,some_hash2<T> &)80 void swap(some_hash2<T>&, some_hash2<T>&) noexcept {}
81 #endif
82
83 template <class T>
84 struct some_alloc
85 {
86 typedef T value_type;
87
some_allocsome_alloc88 some_alloc() {}
89 some_alloc(const some_alloc&);
deallocatesome_alloc90 void deallocate(void*, unsigned) {}
91
92 typedef std::true_type propagate_on_container_swap;
93 };
94
95 template <class T>
96 struct some_alloc2
97 {
98 typedef T value_type;
99
some_alloc2some_alloc2100 some_alloc2() {}
101 some_alloc2(const some_alloc2&);
deallocatesome_alloc2102 void deallocate(void*, unsigned) {}
103
104 typedef std::false_type propagate_on_container_swap;
105 typedef std::true_type is_always_equal;
106 };
107
108 template <class T>
109 struct some_alloc3
110 {
111 typedef T value_type;
112
some_alloc3some_alloc3113 some_alloc3() {}
114 some_alloc3(const some_alloc3&);
deallocatesome_alloc3115 void deallocate(void*, unsigned) {}
116
117 typedef std::false_type propagate_on_container_swap;
118 typedef std::false_type is_always_equal;
119 };
120
main(int,char **)121 int main(int, char**)
122 {
123 {
124 typedef std::unordered_set<MoveOnly> C;
125 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
126 }
127 #if defined(_LIBCPP_VERSION)
128 {
129 typedef std::unordered_set<MoveOnly, std::hash<MoveOnly>,
130 std::equal_to<MoveOnly>, test_allocator<MoveOnly>> C;
131 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
132 }
133 {
134 typedef std::unordered_set<MoveOnly, std::hash<MoveOnly>,
135 std::equal_to<MoveOnly>, other_allocator<MoveOnly>> C;
136 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
137 }
138 #endif // _LIBCPP_VERSION
139 {
140 typedef std::unordered_set<MoveOnly, some_hash<MoveOnly>> C;
141 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
142 }
143 {
144 typedef std::unordered_set<MoveOnly, std::hash<MoveOnly>,
145 some_comp<MoveOnly>> C;
146 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
147 }
148
149 #if TEST_STD_VER >= 14
150 { // POCS allocator, throwable swap for hash, throwable swap for comp
151 typedef std::unordered_set<MoveOnly, some_hash<MoveOnly>, some_comp <MoveOnly>, some_alloc <MoveOnly>> C;
152 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
153 }
154 { // always equal allocator, throwable swap for hash, throwable swap for comp
155 typedef std::unordered_set<MoveOnly, some_hash<MoveOnly>, some_comp <MoveOnly>, some_alloc2<MoveOnly>> C;
156 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
157 }
158 { // POCS allocator, throwable swap for hash, nothrow swap for comp
159 typedef std::unordered_set<MoveOnly, some_hash<MoveOnly>, some_comp2<MoveOnly>, some_alloc <MoveOnly>> C;
160 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
161 }
162 { // always equal allocator, throwable swap for hash, nothrow swap for comp
163 typedef std::unordered_set<MoveOnly, some_hash<MoveOnly>, some_comp2<MoveOnly>, some_alloc2<MoveOnly>> C;
164 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
165 }
166 { // POCS allocator, nothrow swap for hash, throwable swap for comp
167 typedef std::unordered_set<MoveOnly, some_hash2<MoveOnly>, some_comp <MoveOnly>, some_alloc <MoveOnly>> C;
168 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
169 }
170 { // always equal allocator, nothrow swap for hash, throwable swap for comp
171 typedef std::unordered_set<MoveOnly, some_hash2<MoveOnly>, some_comp <MoveOnly>, some_alloc2<MoveOnly>> C;
172 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
173 }
174 { // POCS allocator, nothrow swap for hash, nothrow swap for comp
175 typedef std::unordered_set<MoveOnly, some_hash2<MoveOnly>, some_comp2<MoveOnly>, some_alloc <MoveOnly>> C;
176 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
177 }
178 { // always equal allocator, nothrow swap for hash, nothrow swap for comp
179 typedef std::unordered_set<MoveOnly, some_hash2<MoveOnly>, some_comp2<MoveOnly>, some_alloc2<MoveOnly>> C;
180 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
181 }
182 #if defined(_LIBCPP_VERSION)
183 { // NOT always equal allocator, nothrow swap for hash, nothrow swap for comp
184 typedef std::unordered_set<MoveOnly, some_hash2<MoveOnly>, some_comp2<MoveOnly>, some_alloc3<MoveOnly>> C;
185 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
186 }
187 #endif // _LIBCPP_VERSION
188 #endif
189
190 return 0;
191 }
192