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 // <vector>
11
12 // void swap(vector& 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>::propagate_on_container_swap::value ||
18 // allocator_traits<Allocator>::is_always_equal::value);
19
20 // This tests a conforming extension
21
22 #include <vector>
23 #include <cassert>
24
25 #include "MoveOnly.h"
26 #include "test_allocator.h"
27
28 template <class T>
29 struct some_alloc
30 {
31 typedef T value_type;
32
some_allocsome_alloc33 some_alloc() {}
34 some_alloc(const some_alloc&);
deallocatesome_alloc35 void deallocate(void*, unsigned) {}
36
37 typedef std::true_type propagate_on_container_swap;
38 };
39
40 template <class T>
41 struct some_alloc2
42 {
43 typedef T value_type;
44
some_alloc2some_alloc245 some_alloc2() {}
46 some_alloc2(const some_alloc2&);
deallocatesome_alloc247 void deallocate(void*, unsigned) {}
48
49 typedef std::false_type propagate_on_container_swap;
50 typedef std::true_type is_always_equal;
51 };
52
main()53 int main()
54 {
55 #if __has_feature(cxx_noexcept)
56 {
57 typedef std::vector<MoveOnly> C;
58 C c1, c2;
59 static_assert(noexcept(swap(c1, c2)), "");
60 }
61 {
62 typedef std::vector<MoveOnly, test_allocator<MoveOnly>> C;
63 C c1, c2;
64 static_assert(noexcept(swap(c1, c2)), "");
65 }
66 {
67 typedef std::vector<MoveOnly, other_allocator<MoveOnly>> C;
68 C c1, c2;
69 static_assert(noexcept(swap(c1, c2)), "");
70 }
71 {
72 typedef std::vector<MoveOnly, some_alloc<MoveOnly>> C;
73 C c1, c2;
74 #if TEST_STD_VER >= 14
75 // In c++14, if POCS is set, swapping the allocator is required not to throw
76 static_assert( noexcept(swap(c1, c2)), "");
77 #else
78 static_assert(!noexcept(swap(c1, c2)), "");
79 #endif
80 }
81 #if TEST_STD_VER >= 14
82 {
83 typedef std::vector<MoveOnly, some_alloc2<MoveOnly>> C;
84 C c1, c2;
85 // if the allocators are always equal, then the swap can be noexcept
86 static_assert( noexcept(swap(c1, c2)), "");
87 }
88 #endif
89
90 #endif
91 }
92