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 
24 template <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 > 11
27     _NOEXCEPT
28 #else
29     _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value)
30 #endif
31 {
32   using _VSTD::swap;
33   swap(__a1, __a2);
34 }
35 
36 template <typename _Alloc>
37 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
38 __swap_allocator(_Alloc&, _Alloc&, false_type) _NOEXCEPT {}
39 
40 template <typename _Alloc>
41 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swap_allocator(_Alloc& __a1, _Alloc& __a2)
42 #if _LIBCPP_STD_VER > 11
43     _NOEXCEPT
44 #else
45     _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value)
46 #endif
47 {
48   _VSTD::__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
55