1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___MEMORY_CONSTRUCT_AT_H 11 #define _LIBCPP___MEMORY_CONSTRUCT_AT_H 12 13 #include <__config> 14 #include <__debug> 15 #include <utility> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 #pragma GCC system_header 19 #endif 20 21 _LIBCPP_PUSH_MACROS 22 #include <__undef_macros> 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 // construct_at 27 28 #if _LIBCPP_STD_VER > 17 29 30 template<class _Tp, class ..._Args, class = decltype( 31 ::new (declval<void*>()) _Tp(declval<_Args>()...) 32 )> 33 _LIBCPP_INLINE_VISIBILITY construct_at(_Tp * __location,_Args &&...__args)34constexpr _Tp* construct_at(_Tp* __location, _Args&& ...__args) { 35 _LIBCPP_ASSERT(__location, "null pointer given to construct_at"); 36 return ::new ((void*)__location) _Tp(_VSTD::forward<_Args>(__args)...); 37 } 38 39 #endif 40 41 // destroy_at 42 43 #if _LIBCPP_STD_VER > 14 44 45 template <class _Tp> 46 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 destroy_at(_Tp * __loc)47void destroy_at(_Tp* __loc) { 48 _LIBCPP_ASSERT(__loc, "null pointer given to destroy_at"); 49 __loc->~_Tp(); 50 } 51 52 #endif 53 54 _LIBCPP_END_NAMESPACE_STD 55 56 _LIBCPP_POP_MACROS 57 58 #endif // _LIBCPP___MEMORY_CONSTRUCT_AT_H 59