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30 | // GCC 4.4 supports an outdated version of rvalue references and creates a copy of the forwarded object.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