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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) 2006 Tobias Schwinger
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -40,8 +41,30 @@ namespace boost { namespace fusion
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>
inline pair<First, typename detail::as_fusion_element<Second>::type>
inline typename result_of::make_pair<First,Second>::type
make_pair(Second const& val)
{
return pair<First, typename detail::as_fusion_element<Second>::type>(val);