chromium/third_party/libc++/src/include/__memory/allocator_arg_t.h

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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___FUNCTIONAL_ALLOCATOR_ARG_T_H
#define _LIBCPP___FUNCTIONAL_ALLOCATOR_ARG_T_H

#include <__config>
#include <__memory/uses_allocator.h>
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/remove_cvref.h>
#include <__utility/forward.h>

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

_LIBCPP_BEGIN_NAMESPACE_STD

struct _LIBCPP_TEMPLATE_VIS allocator_arg_t { … };

#if _LIBCPP_STD_VER >= 17
inline constexpr allocator_arg_t allocator_arg = …;
#elif !defined(_LIBCPP_CXX03_LANG)
constexpr allocator_arg_t allocator_arg = allocator_arg_t();
#endif

#ifndef _LIBCPP_CXX03_LANG

// allocator construction

template <class _Tp, class _Alloc, class... _Args>
struct __uses_alloc_ctor_imp { … };

template <class _Tp, class _Alloc, class... _Args>
struct __uses_alloc_ctor : integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value> { … };

template <class _Tp, class _Allocator, class... _Args>
inline _LIBCPP_HIDE_FROM_ABI void
__user_alloc_construct_impl(integral_constant<int, 0>, _Tp* __storage, const _Allocator&, _Args&&... __args) { … }

// FIXME: This should have a version which takes a non-const alloc.
template <class _Tp, class _Allocator, class... _Args>
inline _LIBCPP_HIDE_FROM_ABI void
__user_alloc_construct_impl(integral_constant<int, 1>, _Tp* __storage, const _Allocator& __a, _Args&&... __args) { … }

// FIXME: This should have a version which takes a non-const alloc.
template <class _Tp, class _Allocator, class... _Args>
inline _LIBCPP_HIDE_FROM_ABI void
__user_alloc_construct_impl(integral_constant<int, 2>, _Tp* __storage, const _Allocator& __a, _Args&&... __args) { … }

#endif // _LIBCPP_CXX03_LANG

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___FUNCTIONAL_ALLOCATOR_ARG_T_H