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//===----------------------------------------------------------------------===//
//
// 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_MEMORY_RESOURCE_H
#define _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H
#include <__availability>
#include <__config>
#include <__fwd/memory_resource.h>
#include <cstddef>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER >= 17
_LIBCPP_BEGIN_NAMESPACE_STD
namespace pmr {
// [mem.res.class]
class _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource {
static const size_t __max_align = alignof(max_align_t);
public:
virtual ~memory_resource();
_LIBCPP_NODISCARD_AFTER_CXX17
[[using __gnu__: __returns_nonnull__, __alloc_size__(2), __alloc_align__(3)]] _LIBCPP_HIDE_FROM_ABI void*
allocate(size_t __bytes, size_t __align = __max_align) {
return do_allocate(__bytes, __align);
}
[[__gnu__::__nonnull__]] _LIBCPP_HIDE_FROM_ABI void
deallocate(void* __p, size_t __bytes, size_t __align = __max_align) {
do_deallocate(__p, __bytes, __align);
}
_LIBCPP_HIDE_FROM_ABI bool is_equal(const memory_resource& __other) const noexcept { return do_is_equal(__other); }
private:
virtual void* do_allocate(size_t, size_t) = 0;
virtual void do_deallocate(void*, size_t, size_t) = 0;
virtual bool do_is_equal(memory_resource const&) const noexcept = 0;
};
// [mem.res.eq]
inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool
operator==(const memory_resource& __lhs, const memory_resource& __rhs) noexcept {
return &__lhs == &__rhs || __lhs.is_equal(__rhs);
}
# if _LIBCPP_STD_VER <= 17
inline _LIBCPP_AVAILABILITY_PMR _LIBCPP_HIDE_FROM_ABI bool
operator!=(const memory_resource& __lhs, const memory_resource& __rhs) noexcept {
return !(__lhs == __rhs);
}
# endif
// [mem.res.global]
[[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource*
get_default_resource() noexcept;
[[__gnu__::__returns_nonnull__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource*
set_default_resource(memory_resource*) noexcept;
[[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource*
new_delete_resource() noexcept;
[[using __gnu__: __returns_nonnull__, __const__]] _LIBCPP_AVAILABILITY_PMR _LIBCPP_EXPORTED_FROM_ABI memory_resource*
null_memory_resource() noexcept;
} // namespace pmr
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 17
#endif // _LIBCPP___MEMORY_RESOURCE_MEMORY_RESOURCE_H
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