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// -*- 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___MEMORY_CONSTRUCT_AT_H
#define _LIBCPP___MEMORY_CONSTRUCT_AT_H
#include <__assert>
#include <__config>
#include <__memory/addressof.h>
#include <__new/placement_new_delete.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_array.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
// construct_at
#if _LIBCPP_STD_VER >= 20
template <class _Tp, class... _Args, class = decltype(::new(std::declval<void*>()) _Tp(std::declval<_Args>()...))>
_LIBCPP_HIDE_FROM_ABI constexpr _Tp* construct_at(_Tp* _LIBCPP_DIAGNOSE_NULLPTR __location, _Args&&... __args) {
_LIBCPP_ASSERT_NON_NULL(__location != nullptr, "null pointer given to construct_at");
return ::new (static_cast<void*>(__location)) _Tp(std::forward<_Args>(__args)...);
}
#endif
template <class _Tp, class... _Args, class = decltype(::new(std::declval<void*>()) _Tp(std::declval<_Args>()...))>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp* __construct_at(_Tp* __location, _Args&&... __args) {
#if _LIBCPP_STD_VER >= 20
return std::construct_at(__location, std::forward<_Args>(__args)...);
#else
return _LIBCPP_ASSERT_NON_NULL(__location != nullptr, "null pointer given to construct_at"),
::new (static_cast<void*>(__location)) _Tp(std::forward<_Args>(__args)...);
#endif
}
// destroy_at
// The internal functions are available regardless of the language version (with the exception of the `__destroy_at`
// taking an array).
template <class _Tp, __enable_if_t<!is_array<_Tp>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __destroy_at(_Tp* __loc) {
_LIBCPP_ASSERT_NON_NULL(__loc != nullptr, "null pointer given to destroy_at");
__loc->~_Tp();
}
#if _LIBCPP_STD_VER >= 20
template <class _Tp, __enable_if_t<is_array<_Tp>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr void __destroy_at(_Tp* __loc) {
_LIBCPP_ASSERT_NON_NULL(__loc != nullptr, "null pointer given to destroy_at");
for (auto&& __val : *__loc)
std::__destroy_at(std::addressof(__val));
}
#endif
#if _LIBCPP_STD_VER >= 17
template <class _Tp, enable_if_t<!is_array_v<_Tp>, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void destroy_at(_Tp* _LIBCPP_DIAGNOSE_NULLPTR __loc) {
std::__destroy_at(__loc);
}
# if _LIBCPP_STD_VER >= 20
template <class _Tp, enable_if_t<is_array_v<_Tp>, int> = 0>
_LIBCPP_HIDE_FROM_ABI constexpr void destroy_at(_Tp* _LIBCPP_DIAGNOSE_NULLPTR __loc) {
std::__destroy_at(__loc);
}
# endif
#endif // _LIBCPP_STD_VER >= 17
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___MEMORY_CONSTRUCT_AT_H
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