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 // <deque>
11
12 // void swap(deque& 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
19 // This tests a conforming extension
20
21 #include <deque>
22 #include <cassert>
23
24 #include "MoveOnly.h"
25 #include "test_allocator.h"
26
27 template <class T>
28 struct some_alloc
29 {
30 typedef T value_type;
31
some_allocsome_alloc32 some_alloc() {}
33 some_alloc(const some_alloc&);
deallocatesome_alloc34 void deallocate(void*, unsigned) {}
35
36 typedef std::true_type propagate_on_container_swap;
37 };
38
39 template <class T>
40 struct some_alloc2
41 {
42 typedef T value_type;
43
some_alloc2some_alloc244 some_alloc2() {}
45 some_alloc2(const some_alloc2&);
deallocatesome_alloc246 void deallocate(void*, unsigned) {}
47
48 typedef std::false_type propagate_on_container_swap;
49 typedef std::true_type is_always_equal;
50 };
51
main()52 int main()
53 {
54 #if __has_feature(cxx_noexcept)
55 {
56 typedef std::deque<MoveOnly> C;
57 C c1, c2;
58 static_assert(noexcept(swap(c1, c2)), "");
59 }
60 {
61 typedef std::deque<MoveOnly, test_allocator<MoveOnly>> C;
62 C c1, c2;
63 static_assert(noexcept(swap(c1, c2)), "");
64 }
65 {
66 typedef std::deque<MoveOnly, other_allocator<MoveOnly>> C;
67 C c1, c2;
68 static_assert(noexcept(swap(c1, c2)), "");
69 }
70 {
71 typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
72 C c1, c2;
73 #if TEST_STD_VER >= 14
74 // In c++14, if POCS is set, swapping the allocator is required not to throw
75 static_assert( noexcept(swap(c1, c2)), "");
76 #else
77 static_assert(!noexcept(swap(c1, c2)), "");
78 #endif
79 }
80 #if TEST_STD_VER >= 14
81 {
82 typedef std::deque<MoveOnly, some_alloc2<MoveOnly>> C;
83 C c1, c2;
84 // if the allocators are always equal, then the swap can be noexcept
85 static_assert( noexcept(swap(c1, c2)), "");
86 }
87 #endif
88
89 #endif
90 }
91