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/*=============================================================================
Copyright (c) 2001-2006 Joel de Guzman
Copyright (c) 2008 Eric Niebler
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_PROTO_DETAIL_FUSION_REVERSE_EAH_01_22_2008
#define BOOST_PROTO_DETAIL_FUSION_REVERSE_EAH_01_22_2008
#include <boost/spirit/fusion/detail/access.hpp>
#include <boost/spirit/fusion/iterator/as_fusion_iterator.hpp>
#include <boost/spirit/fusion/iterator/detail/iterator_base.hpp>
#include <boost/spirit/fusion/sequence/detail/sequence_base.hpp>
#include <boost/spirit/fusion/iterator/next.hpp>
#include <boost/spirit/fusion/iterator/prior.hpp>
#include <boost/spirit/fusion/iterator/deref.hpp>
#include <boost/spirit/fusion/iterator/value_of.hpp>
#include <boost/spirit/fusion/sequence/begin.hpp>
#include <boost/spirit/fusion/sequence/end.hpp>
namespace boost { namespace fusion
{
struct reverse_view_tag;
struct reverse_view_iterator_tag;
template <typename First>
struct reverse_view_iterator
: iterator_base<reverse_view_iterator<First> >
{
typedef as_fusion_iterator<First> converter;
typedef typename converter::type first_type;
typedef reverse_view_iterator_tag tag;
reverse_view_iterator(First const& first)
: first(converter::convert(first)) {}
first_type first;
};
template <typename Sequence>
struct reverse_view : sequence_base<reverse_view<Sequence> >
{
typedef as_fusion_sequence<Sequence> seq_converter;
typedef typename seq_converter::type seq;
typedef reverse_view_tag tag;
typedef typename meta::begin<seq>::type first_type;
typedef typename meta::end<seq>::type last_type;
reverse_view(Sequence& seq)
: first(fusion::begin(seq))
, last(fusion::end(seq))
{}
first_type first;
last_type last;
};
namespace meta
{
template <>
struct deref_impl<reverse_view_iterator_tag>
{
template <typename Iterator>
struct apply
{
typedef typename
meta::deref<
typename meta::prior<
typename Iterator::first_type
>::type
>::type
type;
static type
call(Iterator const& i)
{
return *fusion::prior(i.first);
}
};
};
template <>
struct prior_impl<reverse_view_iterator_tag>
{
template <typename Iterator>
struct apply
{
typedef typename Iterator::first_type first_type;
typedef typename next_impl<typename first_type::tag>::
template apply<first_type>
wrapped;
typedef reverse_view_iterator<typename wrapped::type> type;
static type
call(Iterator const& i)
{
return type(wrapped::call(i.first));
}
};
};
template <>
struct next_impl<reverse_view_iterator_tag>
{
template <typename Iterator>
struct apply
{
typedef typename Iterator::first_type first_type;
typedef typename prior_impl<typename first_type::tag>::
template apply<first_type>
wrapped;
typedef reverse_view_iterator<typename wrapped::type> type;
static type
call(Iterator const& i)
{
return type(wrapped::call(i.first));
}
};
};
template <>
struct value_impl<reverse_view_iterator_tag>
{
template <typename Iterator>
struct apply
{
typedef typename
meta::value_of<
typename meta::prior<
typename Iterator::first_type
>::type
>::type
type;
};
};
template <>
struct begin_impl<reverse_view_tag>
{
template <typename Sequence>
struct apply
{
typedef reverse_view_iterator<typename Sequence::last_type> type;
static type
call(Sequence const& s)
{
return type(s.last);
}
};
};
template <>
struct end_impl<reverse_view_tag>
{
template <typename Sequence>
struct apply
{
typedef reverse_view_iterator<typename Sequence::first_type> type;
static type
call(Sequence const& s)
{
return type(s.first);
}
};
};
template <typename Sequence>
struct reverse
{
typedef reverse_view<Sequence> type;
};
}
template <typename Sequence>
inline reverse_view<Sequence const>
reverse(Sequence const& view)
{
return reverse_view<Sequence const>(view);
}
}}
#endif
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