1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03
10
11 // <deque>
12
13 // void swap(deque& c)
14 // noexcept(!allocator_type::propagate_on_container_swap::value ||
15 // __is_nothrow_swappable<allocator_type>::value);
16 //
17 // In C++17, the standard says that swap shall have:
18 // noexcept(allocator_traits<Allocator>::is_always_equal::value);
19
20 // This tests a conforming extension
21
22 #include <deque>
23 #include <utility>
24 #include <cassert>
25
26 #include "test_macros.h"
27 #include "MoveOnly.h"
28 #include "test_allocator.h"
29
30 template <class T>
31 struct some_alloc
32 {
33 typedef T value_type;
34
some_allocsome_alloc35 some_alloc() {}
36 some_alloc(const some_alloc&);
37 void allocate(std::size_t);
deallocatesome_alloc38 void deallocate(void*, unsigned) {}
39
40 typedef std::true_type propagate_on_container_swap;
41 };
42
43 template <class T>
44 struct some_alloc2
45 {
46 typedef T value_type;
47
some_alloc2some_alloc248 some_alloc2() {}
49 some_alloc2(const some_alloc2&);
50 void allocate(std::size_t);
deallocatesome_alloc251 void deallocate(void*, unsigned) {}
52
53 typedef std::false_type propagate_on_container_swap;
54 typedef std::true_type is_always_equal;
55 };
56
main(int,char **)57 int main(int, char**)
58 {
59 {
60 typedef std::deque<MoveOnly> C;
61 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
62 }
63 #if defined(_LIBCPP_VERSION)
64 {
65 typedef std::deque<MoveOnly, test_allocator<MoveOnly>> C;
66 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
67 }
68 {
69 typedef std::deque<MoveOnly, other_allocator<MoveOnly>> C;
70 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
71 }
72 #endif // _LIBCPP_VERSION
73 {
74 typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
75 #if TEST_STD_VER >= 14
76 // In C++14, if POCS is set, swapping the allocator is required not to throw
77 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
78 #else
79 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
80 #endif
81 }
82 #if TEST_STD_VER >= 14
83 {
84 typedef std::deque<MoveOnly, some_alloc2<MoveOnly>> C;
85 // if the allocators are always equal, then the swap can be noexcept
86 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
87 }
88 #endif
89
90
91 return 0;
92 }
93