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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2006 Dan Marsden
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_DISTANCE_IMPL_20060124_2033)
#define FUSION_DISTANCE_IMPL_20060124_2033
#include <boost/fusion/support/config.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/placeholders.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/fusion/iterator/distance.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/fusion/algorithm/query/find_if.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/fusion/sequence/intrinsic/value_at.hpp>
#include <boost/type_traits/is_same.hpp>
namespace boost { namespace fusion {
struct zip_view_iterator_tag;
struct random_access_iterator_tag;
namespace detail
{
template<typename FoundIt, typename SearchIt>
struct best_distance
{
typedef typename result_of::find_if<
typename SearchIt::iterators, is_same<traits::category_of<mpl::_>, random_access_iterator_tag> > finder;
BOOST_MPL_ASSERT_NOT((is_same<typename finder::type, result_of::end<typename SearchIt::iterators> >));
typedef typename result_of::distance<FoundIt, typename finder::type>::type type;
};
template<typename It1, typename It2>
struct default_distance
: result_of::distance<
typename result_of::value_at_c<typename It1::iterators, 0>::type,
typename result_of::value_at_c<typename It2::iterators, 0>::type>
{};
template<typename It1, typename It2>
struct zip_view_iterator_distance
{
typedef typename result_of::find_if<
typename It1::iterators, is_same<traits::category_of<mpl::_>, random_access_iterator_tag> > finder;
typedef typename mpl::eval_if<
is_same<typename finder::type, typename result_of::end<typename It1::iterators>::type>,
detail::default_distance<It1, It2> ,
detail::best_distance<typename finder::type, It2> >::type type;
};
}
namespace extension
{
template<typename Tag>
struct distance_impl;
template<>
struct distance_impl<zip_view_iterator_tag>
{
template<typename It1, typename It2>
struct apply
: detail::zip_view_iterator_distance<It1, It2>::type
{
BOOST_FUSION_GPU_ENABLED
static typename detail::zip_view_iterator_distance<It1, It2>::type
call(It1 const& /*it1*/, It2 const& /*it2*/)
{
return typename detail::zip_view_iterator_distance<It1, It2>::type();
}
};
};
}
}}
#endif
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