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53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#ifndef BOOST_SMART_PTR_DETAIL_SP_FORWARD_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_SP_FORWARD_HPP_INCLUDED
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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// detail/sp_forward.hpp
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//
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// Copyright 2008,2012 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/config.hpp>
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namespace boost
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{
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namespace detail
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{
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#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
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#if defined( BOOST_GCC ) && __GNUC__ * 100 + __GNUC_MINOR__ <= 404
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// GCC 4.4 supports an outdated version of rvalue references and creates a copy of the forwarded object.
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// This results in warnings 'returning reference to temporary'. Therefore we use a special version similar to std::forward.
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template< class T > T&& sp_forward( T && t ) BOOST_NOEXCEPT
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{
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return t;
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}
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#else
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template< class T > T&& sp_forward( T & t ) BOOST_NOEXCEPT
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{
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return static_cast< T&& >( t );
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}
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#endif
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#endif
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} // namespace detail
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} // namespace boost
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_FORWARD_HPP_INCLUDED
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