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&);
deallocatesome_alloc37 void deallocate(void*, unsigned) {}
38
39 typedef std::true_type propagate_on_container_swap;
40 };
41
42 template <class T>
43 struct some_alloc2
44 {
45 typedef T value_type;
46
some_alloc2some_alloc247 some_alloc2() {}
48 some_alloc2(const some_alloc2&);
deallocatesome_alloc249 void deallocate(void*, unsigned) {}
50
51 typedef std::false_type propagate_on_container_swap;
52 typedef std::true_type is_always_equal;
53 };
54
main(int,char **)55 int main(int, char**)
56 {
57 {
58 typedef std::deque<MoveOnly> C;
59 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
60 }
61 #if defined(_LIBCPP_VERSION)
62 {
63 typedef std::deque<MoveOnly, test_allocator<MoveOnly>> C;
64 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
65 }
66 {
67 typedef std::deque<MoveOnly, other_allocator<MoveOnly>> C;
68 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
69 }
70 #endif // _LIBCPP_VERSION
71 {
72 typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
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(std::declval<C&>(), std::declval<C&>())), "");
76 #else
77 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
78 #endif
79 }
80 #if TEST_STD_VER >= 14
81 {
82 typedef std::deque<MoveOnly, some_alloc2<MoveOnly>> C;
83 // if the allocators are always equal, then the swap can be noexcept
84 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
85 }
86 #endif
87
88
89 return 0;
90 }
91