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// <map>
11
12// void swap(multimap& c)
13//     noexcept(!allocator_type::propagate_on_container_swap::value ||
14//              __is_nothrow_swappable<allocator_type>::value);
15//
16//  In C++17, the standard says that swap shall have:
17//     noexcept(allocator_traits<Allocator>::is_always_equal::value &&
18//              noexcept(swap(declval<Compare&>(), declval<Compare&>())));
19
20// This tests a conforming extension
21
22#include <map>
23#include <cassert>
24
25#include "MoveOnly.h"
26#include "test_allocator.h"
27
28template <class T>
29struct some_comp
30{
31    typedef T value_type;
32
33    some_comp() {}
34    some_comp(const some_comp&) {}
35    void deallocate(void*, unsigned) {}
36
37    typedef std::true_type propagate_on_container_swap;
38};
39
40template <class T>
41struct some_comp2
42{
43    typedef T value_type;
44
45    some_comp2() {}
46    some_comp2(const some_comp2&) {}
47    void deallocate(void*, unsigned) {}
48    typedef std::true_type propagate_on_container_swap;
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()
95{
96#if __has_feature(cxx_noexcept)
97    {
98        typedef std::multimap<MoveOnly, MoveOnly> C;
99        C c1, c2;
100        static_assert(noexcept(swap(c1, c2)), "");
101    }
102    {
103        typedef std::multimap<MoveOnly, MoveOnly, std::less<MoveOnly>, test_allocator<MoveOnly>> C;
104        C c1, c2;
105        static_assert(noexcept(swap(c1, c2)), "");
106    }
107    {
108        typedef std::multimap<MoveOnly, MoveOnly, std::less<MoveOnly>, other_allocator<MoveOnly>> C;
109        C c1, c2;
110        static_assert(noexcept(swap(c1, c2)), "");
111    }
112    {
113        typedef std::multimap<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::multimap<MoveOnly, MoveOnly, some_comp <MoveOnly>, some_alloc <MoveOnly>> C;
121    C c1, c2;
122    static_assert(!noexcept(swap(c1, c2)), "");
123    }
124    { // always equal allocator, throwable swap for comp
125    typedef std::multimap<MoveOnly, MoveOnly, some_comp <MoveOnly>, some_alloc2<MoveOnly>> C;
126    C c1, c2;
127    static_assert(!noexcept(swap(c1, c2)), "");
128    }
129    { // POCS allocator, nothrow swap for comp
130    typedef std::multimap<MoveOnly, MoveOnly, some_comp2<MoveOnly>, some_alloc <MoveOnly>> C;
131    C c1, c2;
132    static_assert( noexcept(swap(c1, c2)), "");
133    }
134    { // always equal allocator, nothrow swap for comp
135    typedef std::multimap<MoveOnly, MoveOnly, some_comp2<MoveOnly>, some_alloc2<MoveOnly>> 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<MoveOnly>> C;
142    C c1, c2;
143    static_assert( noexcept(swap(c1, c2)), "");
144    }
145#endif
146
147#endif
148}
149