libcxx/include/__utility/as_lvalue.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___UTILITY_AS_LVALUE_H
  11 #define _LIBCPP___UTILITY_AS_LVALUE_H
  12
  13 #include <__config>
  14
  15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  16 #  pragma GCC system_header
  17 #endif
  18
  19 _LIBCPP_PUSH_MACROS
  20 #include <__undef_macros>
  21
  22 _LIBCPP_BEGIN_NAMESPACE_STD
  23
  24 #ifndef _LIBCPP_CXX03_LANG
  25
  26 template <class _Tp>
  27 _LIBCPP_HIDE_FROM_ABI constexpr _Tp& __as_lvalue(_LIBCPP_LIFETIMEBOUND _Tp&& __t) {
  28   return static_cast<_Tp&>(__t);
  29 }
  30
  31 #endif // !_LIBCPP_CXX03_LANG
  32
  33 _LIBCPP_END_NAMESPACE_STD
  34
  35 _LIBCPP_POP_MACROS
  36
  37 #endif // _LIBCPP___UTILITY_AS_LVALUE_H