__cxx03/__utility/as_lvalue.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___UTILITY_AS_LVALUE_H
0011 #define _LIBCPP___CXX03___UTILITY_AS_LVALUE_H
0012
0013 #include <__cxx03/__config>
0014
0015 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0016 #  pragma GCC system_header
0017 #endif
0018
0019 _LIBCPP_PUSH_MACROS
0020 #include <__cxx03/__undef_macros>
0021
0022 _LIBCPP_BEGIN_NAMESPACE_STD
0023
0024 #ifndef _LIBCPP_CXX03_LANG
0025
0026 template <class _Tp>
0027 _LIBCPP_HIDE_FROM_ABI constexpr _Tp& __as_lvalue(_LIBCPP_LIFETIMEBOUND _Tp&& __t) {
0028   return static_cast<_Tp&>(__t);
0029 }
0030
0031 #endif // !_LIBCPP_CXX03_LANG
0032
0033 _LIBCPP_END_NAMESPACE_STD
0034
0035 _LIBCPP_POP_MACROS
0036
0037 #endif // _LIBCPP___CXX03___UTILITY_AS_LVALUE_H