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 "test_allocator.h"
29
30template <class T>
31struct some_alloc
32{
33 typedef T value_type;
34
35 some_alloc() {}
36 some_alloc(const some_alloc&);
37 void deallocate(void*, unsigned) {}
38
39 typedef std::true_type propagate_on_container_swap;
40};
41
42template <class T>
43struct some_alloc2
44{
45 typedef T value_type;
46
47 some_alloc2() {}
48 some_alloc2(const some_alloc2&);
49 void deallocate(void*, unsigned) {}
50
51 typedef std::false_type propagate_on_container_swap;
52 typedef std::true_type is_always_equal;
53};
54
55int main(int, char**)
56{
57#if defined(_LIBCPP_VERSION)
58 {
59 typedef std::vector<bool> C;
60 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
61 }
62 {
63 typedef std::vector<bool, test_allocator<bool>> C;
64 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
65 }
66 {
67 typedef std::vector<bool, other_allocator<bool>> C;
68 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
69 }
70#endif // _LIBCPP_VERSION
71 {
72#if TEST_STD_VER >= 14
73#if defined(_LIBCPP_VERSION)
74 // In C++14, if POCS is set, swapping the allocator is required not to throw
75 typedef std::vector<bool, some_alloc<bool>> C;
76 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
77#endif // _LIBCPP_VERSION
78#else
79 typedef std::vector<bool, some_alloc<bool>> C;
80 static_assert(!noexcept(swap(x&: std::declval<C&>(), y&: std::declval<C&>())), "");
81#endif
82 }
83#if TEST_STD_VER >= 14
84#if defined(_LIBCPP_VERSION)
85 {
86 typedef std::vector<bool, some_alloc2<bool>> C;
87 // if the allocators are always equal, then the swap can be noexcept
88 static_assert( noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
89 }
90#endif // _LIBCPP_VERSION
91#endif
92
93 return 0;
94}
95

source code of libcxx/test/std/containers/sequences/vector.bool/swap_noexcept.pass.cpp