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 typedef T value_type;
34
35 some_alloc() {}
36 some_alloc(const some_alloc&);
37 void allocate(std::size_t);
38 void deallocate(void*, unsigned) {}
39
40 typedef std::true_type propagate_on_container_swap;
41};
42
43template <class T>
44struct some_alloc2 {
45 typedef T value_type;
46
47 some_alloc2() {}
48 some_alloc2(const some_alloc2&);
49 void allocate(std::size_t);
50 void deallocate(void*, unsigned) {}
51
52 typedef std::false_type propagate_on_container_swap;
53 typedef std::true_type is_always_equal;
54};
55
56void test() {
57 {
58 typedef std::vector<MoveOnly> C;
59 static_assert(noexcept(swap(a&: std::declval<C&>(), b&: std::declval<C&>())), "");
60 }
61#if defined(_LIBCPP_VERSION)
62 {
63 typedef std::vector<MoveOnly, test_allocator<MoveOnly>> C;
64 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
65 }
66#endif
67 {
68 typedef std::vector<MoveOnly, other_allocator<MoveOnly>> C;
69 static_assert(noexcept(swap(std::declval<C&>(), std::declval<C&>())), "");
70 }
71 {
72 typedef std::vector<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::vector<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

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