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 // <map>
13 
14 // void swap(map& 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 <map>
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 
36     some_comp() {}
37     some_comp(const some_comp&) {}
38     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 
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
52 template <typename 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 
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 
68 template <class T>
69 struct 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 
81 template <class T>
82 struct 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 
94 int main()
95 {
96     typedef std::pair<const MoveOnly, MoveOnly> V;
97     {
98         typedef std::map<MoveOnly, MoveOnly> C;
99         C c1, c2;
100         static_assert(noexcept(swap(c1, c2)), "");
101     }
102     {
103         typedef std::map<MoveOnly, MoveOnly, std::less<MoveOnly>, test_allocator<V>> C;
104         C c1, c2;
105         static_assert(noexcept(swap(c1, c2)), "");
106     }
107     {
108         typedef std::map<MoveOnly, MoveOnly, std::less<MoveOnly>, other_allocator<V>> C;
109         C c1, c2;
110         static_assert(noexcept(swap(c1, c2)), "");
111     }
112     {
113         typedef std::map<MoveOnly, MoveOnly, some_comp<MoveOnly>> C;
114         C c1, c2;
115         static_assert(!noexcept(swap(c1, c2)), "");
116     }
117 
118 #if TEST_STD_VER >= 14
119     { // POCS allocator, throwable swap for comp
120     typedef std::map<MoveOnly, MoveOnly, some_comp <MoveOnly>, some_alloc <V>> C;
121     C c1, c2;
122     static_assert(!noexcept(swap(c1, c2)), "");
123     }
124     { // always equal allocator, throwable swap for comp
125     typedef std::map<MoveOnly, MoveOnly, some_comp <MoveOnly>, some_alloc2<V>> C;
126     C c1, c2;
127     static_assert(!noexcept(swap(c1, c2)), "");
128     }
129     { // POCS allocator, nothrow swap for comp
130     typedef std::map<MoveOnly, MoveOnly, some_comp2<MoveOnly>, some_alloc <V>> C;
131     C c1, c2;
132     static_assert( noexcept(swap(c1, c2)), "");
133     }
134     { // always equal allocator, nothrow swap for comp
135     typedef std::map<MoveOnly, MoveOnly, some_comp2<MoveOnly>, some_alloc2<V>> C;
136     C c1, c2;
137     static_assert( noexcept(swap(c1, c2)), "");
138     }
139 
140     { // NOT always equal allocator, nothrow swap for comp
141     typedef std::map<MoveOnly, MoveOnly, some_comp2<MoveOnly>, some_alloc3<V>> C;
142     C c1, c2;
143     static_assert( noexcept(swap(c1, c2)), "");
144     }
145 #endif
146 
147 }
148