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 // <vector>
12
13 // void swap(vector& 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>::propagate_on_container_swap::value ||
19 // allocator_traits<Allocator>::is_always_equal::value);
20
21 // This tests a conforming extension
22
23 #include <vector>
24 #include <utility>
25 #include <cassert>
26
27 #include "test_macros.h"
28 #include "MoveOnly.h"
29 #include "test_allocator.h"
30
31 template <class T>
32 struct some_alloc
33 {
34 typedef T value_type;
35
some_allocsome_alloc36 some_alloc() {}
37 some_alloc(const some_alloc&);
38 void allocate(std::size_t);
deallocatesome_alloc39 void deallocate(void*, unsigned) {}
40
41 typedef std::true_type propagate_on_container_swap;
42 };
43
44 template <class T>
45 struct some_alloc2
46 {
47 typedef T value_type;
48
some_alloc2some_alloc249 some_alloc2() {}
50 some_alloc2(const some_alloc2&);
51 void allocate(std::size_t);
deallocatesome_alloc252 void deallocate(void*, unsigned) {}
53
54 typedef std::false_type propagate_on_container_swap;
55 typedef std::true_type is_always_equal;
56 };
57
test()58 void test()
59 {
60 {
61 typedef std::vector<MoveOnly> C;
62 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
63 }
64 #if defined(_LIBCPP_VERSION)
65 {
66 typedef std::vector<MoveOnly, test_allocator<MoveOnly>> C;
67 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
68 }
69 #endif
70 {
71 typedef std::vector<MoveOnly, other_allocator<MoveOnly>> C;
72 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
73 }
74 {
75 typedef std::vector<MoveOnly, some_alloc<MoveOnly>> C;
76 #if TEST_STD_VER >= 14
77 // In C++14, if POCS is set, swapping the allocator is required not to throw
78 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
79 #else
80 static_assert(!noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
81 #endif
82 }
83 #if TEST_STD_VER >= 14
84 {
85 typedef std::vector<MoveOnly, some_alloc2<MoveOnly>> C;
86 // If the allocators are always equal, then the swap can be noexcept
87 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
88 }
89 #endif
90 }
91