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Better patch from Kohei Takahashi! Allows good forwarding on C++11

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while still allowing C++03.
This commit is contained in:
Joel de Guzman
2014-11-19 08:31:35 +08:00
parent c952a5c053
commit 2a50f7caad
1 changed files with 12 additions and 0 deletions
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12
include/boost/fusion/support/pair.hpp
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@ -16,6 +16,7 @@
#include <boost/config.hpp> #include <boost/config.hpp>
#include <boost/utility/enable_if.hpp> #include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_convertible.hpp> #include <boost/type_traits/is_convertible.hpp>
#include <boost/type_traits/is_lvalue_reference.hpp>
#if defined (BOOST_MSVC) #if defined (BOOST_MSVC)
# pragma warning(push) # pragma warning(push)
@ -48,6 +49,17 @@ namespace boost { namespace fusion
pair(typename detail::call_param<Second>::type val) pair(typename detail::call_param<Second>::type val)
: second(val) {} : second(val) {}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
BOOST_FUSION_GPU_ENABLED
template <typename Second2>
pair(Second2&& val
, typename boost::disable_if<is_lvalue_reference<Second2> >::type* /* dummy */ = 0
, typename boost::enable_if<is_convertible<Second2, Second> >::type* /*dummy*/ = 0
) : second(std::forward<Second>(val)) {}
#endif
template <typename Second2> template <typename Second2>
BOOST_FUSION_GPU_ENABLED BOOST_FUSION_GPU_ENABLED
pair(pair<First, Second2> const& rhs) pair(pair<First, Second2> const& rhs)