1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // UNSUPPORTED: c++98, c++03
11
12 // <set>
13
14 // void swap(set& c)
15 // noexcept(!allocator_type::propagate_on_container_swap::value ||
16 // __is_nothrow_swappable<allocator_type>::value);
17 //
18 // In C++17, the standard says that swap shall have:
19 // noexcept(allocator_traits<Allocator>::is_always_equal::value &&
20 // noexcept(swap(declval<Compare&>(), declval<Compare&>())));
21
22 // This tests a conforming extension
23
24 #include <set>
25 #include <utility>
26 #include <cassert>
27
28 #include "test_macros.h"
29 #include "MoveOnly.h"
30 #include "test_allocator.h"
31
32 template <class T>
33 struct some_comp
34 {
35 typedef T value_type;
36
some_compsome_comp37 some_comp() {}
some_compsome_comp38 some_comp(const some_comp&) {}
operator ()some_comp39 bool operator()(const T&, const T&) const { return false; }
40 };
41
42 template <class T>
43 struct some_comp2
44 {
45 typedef T value_type;
46
some_comp2some_comp247 some_comp2() {}
some_comp2some_comp248 some_comp2(const some_comp2&) {}
operator ()some_comp249 bool operator()(const T&, const T&) const { return false; }
50 };
51
52 #if TEST_STD_VER >= 14
53 template <typename T>
swap(some_comp2<T> &,some_comp2<T> &)54 void swap(some_comp2<T>&, some_comp2<T>&) noexcept {}
55 #endif
56
57 template <class T>
58 struct some_alloc
59 {
60 typedef T value_type;
61
some_allocsome_alloc62 some_alloc() {}
63 some_alloc(const some_alloc&);
deallocatesome_alloc64 void deallocate(void*, unsigned) {}
65
66 typedef std::true_type propagate_on_container_swap;
67 };
68
69 template <class T>
70 struct some_alloc2
71 {
72 typedef T value_type;
73
some_alloc2some_alloc274 some_alloc2() {}
75 some_alloc2(const some_alloc2&);
deallocatesome_alloc276 void deallocate(void*, unsigned) {}
77
78 typedef std::false_type propagate_on_container_swap;
79 typedef std::true_type is_always_equal;
80 };
81
82 template <class T>
83 struct some_alloc3
84 {
85 typedef T value_type;
86
some_alloc3some_alloc387 some_alloc3() {}
88 some_alloc3(const some_alloc3&);
deallocatesome_alloc389 void deallocate(void*, unsigned) {}
90
91 typedef std::false_type propagate_on_container_swap;
92 typedef std::false_type is_always_equal;
93 };
94
main()95 int main()
96 {
97 {
98 typedef std::set<MoveOnly> C;
99 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
100 }
101 #if defined(_LIBCPP_VERSION)
102 {
103 typedef std::set<MoveOnly, std::less<MoveOnly>, test_allocator<MoveOnly>> C;
104 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
105 }
106 {
107 typedef std::set<MoveOnly, std::less<MoveOnly>, other_allocator<MoveOnly>> C;
108 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
109 }
110 #endif // _LIBCPP_VERSION
111 {
112 typedef std::set<MoveOnly, some_comp<MoveOnly>> C;
113 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
114 }
115
116 #if TEST_STD_VER >= 14
117 { // POCS allocator, throwable swap for comp
118 typedef std::set<MoveOnly, some_comp <MoveOnly>, some_alloc <MoveOnly>> C;
119 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
120 }
121 { // always equal allocator, throwable swap for comp
122 typedef std::set<MoveOnly, some_comp <MoveOnly>, some_alloc2<MoveOnly>> C;
123 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
124 }
125 { // POCS allocator, nothrow swap for comp
126 typedef std::set<MoveOnly, some_comp2<MoveOnly>, some_alloc <MoveOnly>> C;
127 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
128 }
129 { // always equal allocator, nothrow swap for comp
130 typedef std::set<MoveOnly, some_comp2<MoveOnly>, some_alloc2<MoveOnly>> C;
131 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
132 }
133 #if defined(_LIBCPP_VERSION)
134 { // NOT always equal allocator, nothrow swap for comp
135 typedef std::set<MoveOnly, some_comp2<MoveOnly>, some_alloc3<MoveOnly>> C;
136 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
137 }
138 #endif // _LIBCPP_VERSION
139 #endif
140
141 }
142