// -*- 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 ()) _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(__location)) _Tp(std::forward<_Args>(__args)...); } #endif template ()) _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(__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 ::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 ::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 , 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 , 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