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/*=============================================================================
Copyright (c) 2007 Tobias Schwinger
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(BOOST_FUSION_REPETITIVE_VIEW_NEXT_IMPL_HPP_INCLUDED)
#define BOOST_FUSION_REPETITIVE_VIEW_NEXT_IMPL_HPP_INCLUDED
#include <boost/fusion/iterator/next.hpp>
#include <boost/fusion/iterator/equal_to.hpp>
namespace boost { namespace fusion
{
struct repetitive_view_iterator_tag;
template <typename Sequence, typename Pos>
struct repetitive_view_iterator;
namespace extension
{
template <typename Tag>
struct next_impl;
template <>
struct next_impl<repetitive_view_iterator_tag>
{
template<typename Iterator,
bool Last = result_of::equal_to<typename Iterator::end_type,
typename result_of::next<
typename Iterator::pos_type
>::type>::value >
struct apply_nonempty // <Iterator,false>
{
// advanvce to next position
typedef repetitive_view_iterator<
typename Iterator::sequence_type,
typename result_of::next<typename Iterator::pos_type>::type
>
type;
static type call(Iterator const& i)
{
return type(i.seq, next(i.pos));
}
};
template <typename Iterator>
struct apply_nonempty<Iterator,true>
{
// reset to beginning
typedef repetitive_view_iterator<
typename Iterator::sequence_type,
typename Iterator::first_type
>
type;
static type call(Iterator const& i)
{
return type(i.seq);
}
};
template <typename Iterator,
bool Empty = result_of::equal_to<typename Iterator::end_type,
typename Iterator::pos_type>::value >
struct apply // <Iterator,false>
: apply_nonempty<Iterator>
{ };
template <typename Iterator>
struct apply<Iterator,true>
{
// eps^n = eps
typedef Iterator type;
static type call(Iterator const& i)
{
return type(i);
}
};
};
}
}}
#endif
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