chromium/third_party/libc++/src/include/__memory_resource/polymorphic_allocator.h

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___MEMORY_RESOURCE_POLYMORPHIC_ALLOCATOR_H
#define _LIBCPP___MEMORY_RESOURCE_POLYMORPHIC_ALLOCATOR_H

#include <__assert>
#include <__config>
#include <__fwd/pair.h>
#include <__memory_resource/memory_resource.h>
#include <__utility/exception_guard.h>
#include <cstddef>
#include <limits>
#include <new>
#include <tuple>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

#if _LIBCPP_STD_VER >= 17

_LIBCPP_BEGIN_NAMESPACE_STD

namespace pmr {

// [mem.poly.allocator.class]

template <class _ValueType
#  if _LIBCPP_STD_VER >= 20
          = byte
#  endif
          >
class _LIBCPP_AVAILABILITY_PMR _LIBCPP_TEMPLATE_VIS polymorphic_allocator { … };

// [mem.poly.allocator.eq]

template <class _Tp, class _Up>
inline _LIBCPP_HIDE_FROM_ABI bool
operator==(const polymorphic_allocator<_Tp>& __lhs, const polymorphic_allocator<_Up>& __rhs) noexcept { … }

#  if _LIBCPP_STD_VER <= 17

template <class _Tp, class _Up>
inline _LIBCPP_HIDE_FROM_ABI bool
operator!=(const polymorphic_allocator<_Tp>& __lhs, const polymorphic_allocator<_Up>& __rhs) noexcept {
  return !(__lhs == __rhs);
}

#  endif

} // namespace pmr

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_STD_VER >= 17

_LIBCPP_POP_MACROS

#endif // _LIBCPP___MEMORY_RESOURCE_POLYMORPHIC_ALLOCATOR_H