__cxx03/__memory/voidify.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___CXX03___MEMORY_VOIDIFY_H
0011 #define _LIBCPP___CXX03___MEMORY_VOIDIFY_H
0012
0013 #include <__cxx03/__config>
0014 #include <__cxx03/__memory/addressof.h>
0015
0016 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0017 #  pragma GCC system_header
0018 #endif
0019
0020 _LIBCPP_BEGIN_NAMESPACE_STD
0021
0022 template <typename _Tp>
0023 _LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void* __voidify(_Tp& __from) {
0024   // Cast away cv-qualifiers to allow modifying elements of a range through const iterators.
0025   return const_cast<void*>(static_cast<const volatile void*>(std::addressof(__from)));
0026 }
0027
0028 _LIBCPP_END_NAMESPACE_STD
0029
0030 #endif // _LIBCPP___CXX03___MEMORY_VOIDIFY_H