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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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H10#define _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H11 12#include <__config>13#include <__cstddef/max_align_t.h>14#include <__cstddef/size_t.h>15#include <__fwd/memory_resource.h>16 17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)18#  pragma GCC system_header19#endif20 21#if _LIBCPP_STD_VER >= 1722 23_LIBCPP_BEGIN_NAMESPACE_STD24 25namespace pmr {26 27// [mem.res.class]28 29class _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource {30  static const size_t __max_align = alignof(max_align_t);31 32public:33  virtual ~memory_resource();34 35  [[nodiscard]] [[using __gnu__: __returns_nonnull__, __alloc_size__(2), __alloc_align__(3)]]36  _LIBCPP_HIDE_FROM_ABI void* allocate(size_t __bytes, size_t __align = __max_align) {37    return do_allocate(__bytes, __align);38  }39 40  [[__gnu__::__nonnull__]] _LIBCPP_HIDE_FROM_ABI void41  deallocate(void* __p, size_t __bytes, size_t __align = __max_align) {42    do_deallocate(__p, __bytes, __align);43  }44 45  _LIBCPP_HIDE_FROM_ABI bool is_equal(const memory_resource& __other) const noexcept { return do_is_equal(__other); }46 47private:48  virtual void* do_allocate(size_t, size_t)                       = 0;49  virtual void do_deallocate(void*, size_t, size_t)               = 0;50  virtual bool do_is_equal(memory_resource const&) const noexcept = 0;51};52 53// [mem.res.eq]54 55inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool56operator==(const memory_resource& __lhs, const memory_resource& __rhs) noexcept {57  return &__lhs == &__rhs || __lhs.is_equal(__rhs);58}59 60#  if _LIBCPP_STD_VER <= 1761 62inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool63operator!=(const memory_resource& __lhs, const memory_resource& __rhs) noexcept {64  return !(__lhs == __rhs);65}66 67#  endif68 69// [mem.res.global]70 71[[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource*72get_default_resource() noexcept;73 74[[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource*75set_default_resource(memory_resource*) noexcept;76 77[[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource*78new_delete_resource() noexcept;79 80[[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource*81null_memory_resource() noexcept;82 83} // namespace pmr84 85_LIBCPP_END_NAMESPACE_STD86 87#endif // _LIBCPP_STD_VER >= 1788 89#endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H90