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#ifndef _LIBCPP___MEMORY_SWAP_ALLOCATOR_H
10#define _LIBCPP___MEMORY_SWAP_ALLOCATOR_H
11
12#include <__config>
13#include <__memory/allocator_traits.h>
14#include <__type_traits/integral_constant.h>
15#include <__type_traits/is_swappable.h>
16#include <__utility/swap.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19#  pragma GCC system_header
20#endif
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23
24template <typename _Alloc>
25_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swap_allocator(_Alloc& __a1, _Alloc& __a2, true_type)
26#if _LIBCPP_STD_VER >= 14
27    _NOEXCEPT
28#else
29    _NOEXCEPT_(__is_nothrow_swappable_v<_Alloc>)
30#endif
31{
32  using std::swap;
33  swap(__a1, __a2);
34}
35
36template <typename _Alloc>
37inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
38__swap_allocator(_Alloc&, _Alloc&, false_type) _NOEXCEPT {}
39
40template <typename _Alloc>
41inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swap_allocator(_Alloc& __a1, _Alloc& __a2)
42#if _LIBCPP_STD_VER >= 14
43    _NOEXCEPT
44#else
45    _NOEXCEPT_(__is_nothrow_swappable_v<_Alloc>)
46#endif
47{
48  std::__swap_allocator(
49      __a1, __a2, integral_constant<bool, allocator_traits<_Alloc>::propagate_on_container_swap::value>());
50}
51
52_LIBCPP_END_NAMESPACE_STD
53
54#endif // _LIBCPP___MEMORY_SWAP_ALLOCATOR_H