libcxx/include/__memory/voidify.h

   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_VOIDIFY_H
  11 #define _LIBCPP___MEMORY_VOIDIFY_H
  12
  13 #include <__config>
  14 #include <__memory/addressof.h>
  15
  16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  17 #  pragma GCC system_header
  18 #endif
  19
  20 _LIBCPP_BEGIN_NAMESPACE_STD
  21
  22 template <typename _Tp>
  23 _LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void* __voidify(_Tp& __from) {
  24   // Cast away cv-qualifiers to allow modifying elements of a range through const iterators.
  25   return const_cast<void*>(static_cast<const volatile void*>(_VSTD::addressof(__from)));
  26 }
  27
  28 _LIBCPP_END_NAMESPACE_STD
  29
  30 #endif // _LIBCPP___MEMORY_VOIDIFY_H