libcxx/include/__memory/swap_allocator.h

   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 >= 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
  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 >= 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