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cb41740187
This changes the `is_swappable` implementation to use variable templates first and basing the class templates on that. This avoids instantiating them when the `_v` versions are used, which are generally less resource intensive.
55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___MEMORY_SWAP_ALLOCATOR_H
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#define _LIBCPP___MEMORY_SWAP_ALLOCATOR_H
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#include <__config>
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#include <__memory/allocator_traits.h>
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#include <__type_traits/integral_constant.h>
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#include <__type_traits/is_swappable.h>
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#include <__utility/swap.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <typename _Alloc>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swap_allocator(_Alloc& __a1, _Alloc& __a2, true_type)
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#if _LIBCPP_STD_VER >= 14
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_NOEXCEPT
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#else
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_NOEXCEPT_(__is_nothrow_swappable_v<_Alloc>)
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#endif
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{
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using std::swap;
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swap(__a1, __a2);
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}
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template <typename _Alloc>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
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__swap_allocator(_Alloc&, _Alloc&, false_type) _NOEXCEPT {}
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template <typename _Alloc>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void __swap_allocator(_Alloc& __a1, _Alloc& __a2)
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#if _LIBCPP_STD_VER >= 14
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_NOEXCEPT
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#else
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_NOEXCEPT_(__is_nothrow_swappable_v<_Alloc>)
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#endif
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{
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std::__swap_allocator(
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__a1, __a2, integral_constant<bool, allocator_traits<_Alloc>::propagate_on_container_swap::value>());
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_SWAP_ALLOCATOR_H
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