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adds result metafunction for make_pair and pair members

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[SVN r35748]
This commit is contained in:
Tobias Schwinger
2006-10-26 07:45:43 +00:00
parent 1c3c70f4cc
commit bac5e1b5c5
1 changed files with 24 additions and 1 deletions
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25
include/boost/fusion/support/pair.hpp
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@ -1,5 +1,6 @@
/*============================================================================= /*=============================================================================
Copyright (c) 2005 Joel de Guzman Copyright (c) 2005 Joel de Guzman
Copyright (c) 2006 Tobias Schwinger
Use, modification and distribution is subject to the Boost Software Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -40,8 +41,30 @@ namespace boost { namespace fusion
Second second; Second second;
}; };
namespace result_of
{
template<typename First, typename Second>
struct make_pair
{
typedef fusion::pair<First,
typename detail::as_fusion_element<Second>::type> type;
};
template<class Pair>
struct first
{
typedef typename Pair::first_type type;
};
template<class Pair>
struct second
{
typedef typename Pair::second_type type;
};
}
template <typename First, typename Second> template <typename First, typename Second>
inline pair<First, typename detail::as_fusion_element<Second>::type> inline typename result_of::make_pair<First,Second>::type
make_pair(Second const& val) make_pair(Second const& val)
{ {
return pair<First, typename detail::as_fusion_element<Second>::type>(val); return pair<First, typename detail::as_fusion_element<Second>::type>(val);