/*============================================================================= | |
Copyright (c) 2001-2006 Joel de Guzman | |
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) | |
==============================================================================*/ | |
#if !defined(FUSION_DEREF_05042005_1019) | |
#define FUSION_DEREF_05042005_1019 | |
#include <boost/fusion/support/iterator_base.hpp> | |
#include <boost/fusion/support/tag_of.hpp> | |
namespace boost { namespace fusion | |
{ | |
// Special tags: | |
struct iterator_facade_tag; // iterator facade tag | |
struct boost_array_iterator_tag; // boost::array iterator tag | |
struct mpl_iterator_tag; // mpl sequence iterator tag | |
struct std_pair_iterator_tag; // std::pair iterator tag | |
namespace extension | |
{ | |
template <typename Tag> | |
struct deref_impl | |
{ | |
template <typename Iterator> | |
struct apply {}; | |
}; | |
template <> | |
struct deref_impl<iterator_facade_tag> | |
{ | |
template <typename Iterator> | |
struct apply : Iterator::template deref<Iterator> {}; | |
}; | |
template <> | |
struct deref_impl<boost_array_iterator_tag>; | |
template <> | |
struct deref_impl<mpl_iterator_tag>; | |
template <> | |
struct deref_impl<std_pair_iterator_tag>; | |
} | |
namespace result_of | |
{ | |
template <typename Iterator> | |
struct deref | |
: extension::deref_impl<typename detail::tag_of<Iterator>::type>:: | |
template apply<Iterator> | |
{}; | |
} | |
template <typename Iterator> | |
typename result_of::deref<Iterator>::type | |
deref(Iterator const& i) | |
{ | |
typedef result_of::deref<Iterator> deref_meta; | |
return deref_meta::call(i); | |
} | |
template <typename Iterator> | |
typename result_of::deref<Iterator>::type | |
operator*(iterator_base<Iterator> const& i) | |
{ | |
return fusion::deref(i.cast()); | |
} | |
}} | |
#endif |