| 1 | #ifndef BOOST_SMART_PTR_DETAIL_SP_FORWARD_HPP_INCLUDED |
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| 2 | #define BOOST_SMART_PTR_DETAIL_SP_FORWARD_HPP_INCLUDED |
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| 3 | |
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| 4 | // MS compatible compilers support #pragma once |
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| 5 | |
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| 6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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| 7 | # pragma once |
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| 8 | #endif |
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| 9 | |
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| 10 | // detail/sp_forward.hpp |
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| 11 | // |
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| 12 | // Copyright 2008,2012 Peter Dimov |
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| 13 | // |
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| 14 | // Distributed under the Boost Software License, Version 1.0. |
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| 15 | // See accompanying file LICENSE_1_0.txt or copy at |
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| 16 | // http://www.boost.org/LICENSE_1_0.txt |
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| 17 | |
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| 18 | #include <boost/config.hpp> |
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| 19 | |
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| 20 | namespace boost |
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| 21 | { |
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| 22 | |
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| 23 | namespace detail |
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| 24 | { |
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| 25 | |
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| 26 | #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
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| 27 | |
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| 28 | #if defined( BOOST_GCC ) && __GNUC__ * 100 + __GNUC_MINOR__ <= 404 |
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| 29 | |
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| 30 | // GCC 4.4 supports an outdated version of rvalue references and creates a copy of the forwarded object. |
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| 31 | // This results in warnings 'returning reference to temporary'. Therefore we use a special version similar to std::forward. |
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| 32 | template< class T > T&& sp_forward( T && t ) BOOST_NOEXCEPT |
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| 33 | { |
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| 34 | return t; |
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| 35 | } |
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| 36 | |
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| 37 | #else |
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| 38 | |
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| 39 | template< class T > T&& sp_forward( T & t ) BOOST_NOEXCEPT |
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| 40 | { |
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| 41 | return static_cast< T&& >( t ); |
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| 42 | } |
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| 43 | |
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| 44 | #endif |
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| 45 | |
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| 46 | #endif |
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| 47 | |
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| 48 | } // namespace detail |
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| 49 | |
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| 50 | } // namespace boost |
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| 51 | |
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| 52 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_FORWARD_HPP_INCLUDED |
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| 53 | |
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