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/*=============================================================================
Copyright (c) 2001-2011 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/support/config.hpp>
#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
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Swift