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_ALLOCATE_AT_LEAST_H
10#define _LIBCPP___MEMORY_ALLOCATE_AT_LEAST_H
11
12#include <__config>
13#include <__cstddef/size_t.h>
14#include <__memory/allocator_traits.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17# pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22template <class _Pointer, class _SizeT = size_t>
23struct __allocation_result {
24 _Pointer ptr;
25 _SizeT count;
26
27 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __allocation_result(_Pointer __ptr, _SizeT __count)
28 : ptr(__ptr), count(__count) {}
29};
30_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(__allocation_result);
31
32#if _LIBCPP_STD_VER >= 23
33
34template <class _Alloc>
35[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto __allocate_at_least(_Alloc& __alloc, size_t __n) {
36 auto __res = std::allocator_traits<_Alloc>::allocate_at_least(__alloc, __n);
37 return __allocation_result{__res.ptr, __res.count};
38}
39
40#else
41
42template <class _Alloc, class _Traits = allocator_traits<_Alloc> >
43[[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI
44_LIBCPP_CONSTEXPR __allocation_result<typename _Traits::pointer, typename _Traits::size_type>
45__allocate_at_least(_Alloc& __alloc, size_t __n) {
46 return __allocation_result<typename _Traits::pointer, typename _Traits::size_type>(__alloc.allocate(__n), __n);
47}
48
49#endif // _LIBCPP_STD_VER >= 23
50
51_LIBCPP_END_NAMESPACE_STD
52
53#endif // _LIBCPP___MEMORY_ALLOCATE_AT_LEAST_H
54