/*============================================================================= | |
Copyright (c) 2009 Christopher Schmidt | |
Distributed under the Boost Software License, Version 1.0. (See accompanying | |
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
==============================================================================*/ | |
#ifndef BOOST_FUSION_CONTAINER_MAP_DETAIL_DEREF_DATA_IMPL_HPP | |
#define BOOST_FUSION_CONTAINER_MAP_DETAIL_DEREF_DATA_IMPL_HPP | |
#include <boost/fusion/iterator/value_of.hpp> | |
#include <boost/fusion/iterator/deref.hpp> | |
#include <boost/fusion/support/detail/access.hpp> | |
#include <boost/type_traits/is_const.hpp> | |
#include <boost/mpl/eval_if.hpp> | |
#include <boost/mpl/identity.hpp> | |
namespace boost { namespace fusion { namespace extension | |
{ | |
template <typename> | |
struct deref_data_impl; | |
template <> | |
struct deref_data_impl<map_iterator_tag> | |
{ | |
template <typename It> | |
struct apply | |
{ | |
typedef typename result_of::value_of<It>::type::second_type data; | |
typedef typename | |
mpl::eval_if< | |
is_const<typename It::seq_type> | |
, detail::cref_result<mpl::identity<data> > | |
, detail::ref_result<mpl::identity<data> > | |
>::type | |
type; | |
static type | |
call(It const& it) | |
{ | |
return deref(it).second; | |
} | |
}; | |
}; | |
}}} | |
#endif |