/*============================================================================= | |
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_FUSION_ITERATOR_10012005_1551) | |
#define FUSION_FUSION_ITERATOR_10012005_1551 | |
#include <boost/fusion/iterator/value_of.hpp> | |
#include <boost/fusion/iterator/next.hpp> | |
#include <boost/fusion/iterator/prior.hpp> | |
#include <boost/fusion/iterator/advance.hpp> | |
#include <boost/fusion/iterator/distance.hpp> | |
#include <boost/fusion/support/category_of.hpp> | |
#include <boost/mpl/next_prior.hpp> | |
#include <boost/mpl/advance_fwd.hpp> | |
#include <boost/mpl/distance_fwd.hpp> | |
#include <boost/mpl/iterator_tags.hpp> | |
#include <boost/mpl/eval_if.hpp> | |
#include <boost/type_traits/is_base_of.hpp> | |
namespace boost { namespace fusion { namespace detail | |
{ | |
template<class Category> | |
struct to_mpl_category { | |
typedef typename mpl::eval_if< | |
is_base_of<random_access_traversal_tag, Category>, | |
mpl::random_access_iterator_tag, | |
mpl::eval_if< | |
is_base_of<bidirectional_traversal_tag, Category>, | |
mpl::bidirectional_iterator_tag, | |
mpl::forward_iterator_tag | |
> | |
>::type type; | |
}; | |
}}} | |
namespace boost { namespace mpl | |
{ | |
template <typename Iterator> | |
struct fusion_iterator | |
{ | |
typedef typename fusion::result_of::value_of<Iterator>::type type; | |
typedef typename fusion::traits::category_of<Iterator>::type fusion_category; | |
typedef typename fusion::detail::to_mpl_category<fusion_category>::type category; | |
typedef Iterator iterator; | |
}; | |
template <typename Iterator> | |
struct next<fusion_iterator<Iterator> > | |
{ | |
typedef fusion_iterator<typename fusion::result_of::next<Iterator>::type> type; | |
}; | |
template <typename Iterator> | |
struct prior<fusion_iterator<Iterator> > | |
{ | |
typedef fusion_iterator<typename fusion::result_of::prior<Iterator>::type> type; | |
}; | |
template <typename Iterator, typename N> | |
struct advance<fusion_iterator<Iterator>, N> | |
{ | |
typedef fusion_iterator<typename fusion::result_of::advance<Iterator, N>::type> type; | |
}; | |
template <typename First, typename Last> | |
struct distance<fusion_iterator<First>, fusion_iterator<Last> > | |
: fusion::result_of::distance<First, Last> | |
{}; | |
}} | |
#endif | |