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// Boost.Range library
//
// Copyright Neil Groves 2009. Use, modification and
// distribution is subject to 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)
//
// Acknowledgements:
// aschoedl supplied a fix to supply the level of interoperability I had
// originally intended, but failed to implement.
//
// For more information, see http://www.boost.org/libs/range/
//
#ifndef BOOST_RANGE_DETAIL_DEMOTE_ITERATOR_TRAVERSAL_TAG_HPP_INCLUDED
#define BOOST_RANGE_DETAIL_DEMOTE_ITERATOR_TRAVERSAL_TAG_HPP_INCLUDED
#include <boost/iterator/iterator_categories.hpp>
namespace boost
{
namespace range_detail
{
template<class IteratorTraversalTag1, class IteratorTraversalTag2>
struct inner_demote_iterator_traversal_tag
{
};
#define BOOST_DEMOTE_TRAVERSAL_TAG( Tag1, Tag2, ResultTag ) \
template<> struct inner_demote_iterator_traversal_tag< Tag1 , Tag2 > \
{ \
typedef ResultTag type; \
};
BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, no_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, incrementable_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, single_pass_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, forward_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, bidirectional_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, random_access_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, no_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, single_pass_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, forward_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, bidirectional_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, random_access_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, no_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, forward_traversal_tag, single_pass_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, bidirectional_traversal_tag, single_pass_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, random_access_traversal_tag, single_pass_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, no_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, forward_traversal_tag, forward_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, bidirectional_traversal_tag, forward_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, random_access_traversal_tag, forward_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, no_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, forward_traversal_tag, forward_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, bidirectional_traversal_tag, bidirectional_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, random_access_traversal_tag, bidirectional_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, no_traversal_tag, no_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, forward_traversal_tag, forward_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, bidirectional_traversal_tag, bidirectional_traversal_tag )
BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, random_access_traversal_tag, random_access_traversal_tag )
#undef BOOST_DEMOTE_TRAVERSAL_TAG
template<class IteratorTraversalTag1, class IteratorTraversalTag2>
struct demote_iterator_traversal_tag
: inner_demote_iterator_traversal_tag<
typename boost::detail::pure_traversal_tag< IteratorTraversalTag1 >::type,
typename boost::detail::pure_traversal_tag< IteratorTraversalTag2 >::type
>
{
};
} // namespace range_detail
} // namespace boost
#endif // include guard
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