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(set& 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
31template <class T>
32struct some_comp
33{
34 typedef T value_type;
35
36 some_comp() {}
37 some_comp(const some_comp&) {}
38 bool operator()(const T&, const T&) const { return false; }
39};
40
41template <class T>
42struct some_comp2
43{
44 typedef T value_type;
45
46 some_comp2() {}
47 some_comp2(const some_comp2&) {}
48 bool operator()(const T&, const T&) const { return false; }
49};
50
51#if TEST_STD_VER >= 14
52template <typename T>
53void swap(some_comp2<T>&, some_comp2<T>&) noexcept {}
54#endif
55
56template <class T>
57struct some_alloc
58{
59 typedef T value_type;
60
61 some_alloc() {}
62 some_alloc(const some_alloc&);
63 void deallocate(void*, unsigned) {}
64
65 typedef std::true_type propagate_on_container_swap;
66};
67
68template <class T>
69struct some_alloc2
70{
71 typedef T value_type;
72
73 some_alloc2() {}
74 some_alloc2(const some_alloc2&);
75 void deallocate(void*, unsigned) {}
76
77 typedef std::false_type propagate_on_container_swap;
78 typedef std::true_type is_always_equal;
79};
80
81template <class T>
82struct some_alloc3
83{
84 typedef T value_type;
85
86 some_alloc3() {}
87 some_alloc3(const some_alloc3&);
88 void deallocate(void*, unsigned) {}
89
90 typedef std::false_type propagate_on_container_swap;
91 typedef std::false_type is_always_equal;
92};
93
94int main(int, char**)
95{
96 {
97 typedef std::set<MoveOnly> C;
98 static_assert(noexcept(swap(a&: std::declval<C&>(), b&: std::declval<C&>())), "");
99 }
100#if defined(_LIBCPP_VERSION)
101 {
102 typedef std::set<MoveOnly, std::less<MoveOnly>, test_allocator<MoveOnly>> C;
103 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
104 }
105 {
106 typedef std::set<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::set<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::set<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::set<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::set<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::set<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::set<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
141 return 0;
142}
143

source code of libcxx/test/std/containers/associative/set/set.special/swap_noexcept.pass.cpp