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
31template <class T>
32struct some_alloc
33{
34 typedef T value_type;
35
36 some_alloc() {}
37 some_alloc(const some_alloc&);
38 void allocate(std::size_t);
39 void deallocate(void*, unsigned) {}
40
41 typedef std::true_type propagate_on_container_swap;
42};
43
44template <class T>
45struct some_alloc2
46{
47 typedef T value_type;
48
49 some_alloc2() {}
50 some_alloc2(const some_alloc2&);
51 void allocate(std::size_t);
52 void deallocate(void*, unsigned) {}
53
54 typedef std::false_type propagate_on_container_swap;
55 typedef std::true_type is_always_equal;
56};
57
58void test()
59{
60 {
61 typedef std::vector<MoveOnly> C;
62 static_assert(noexcept(swap(a&: std::declval<C&>(), b&: 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

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