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