92 lines
5.4 KiB
Plaintext
92 lines
5.4 KiB
Plaintext
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// Boost.Range library
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//
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// Copyright Neil Groves 2009. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Acknowledgements:
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// aschoedl supplied a fix to supply the level of interoperability I had
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// originally intended, but failed to implement.
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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#ifndef BOOST_RANGE_DETAIL_DEMOTE_ITERATOR_TRAVERSAL_TAG_HPP_INCLUDED
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#define BOOST_RANGE_DETAIL_DEMOTE_ITERATOR_TRAVERSAL_TAG_HPP_INCLUDED
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#include <boost/iterator/iterator_categories.hpp>
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namespace boost
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{
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namespace range_detail
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{
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template<class IteratorTraversalTag1, class IteratorTraversalTag2>
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struct inner_demote_iterator_traversal_tag
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{
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};
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#define BOOST_DEMOTE_TRAVERSAL_TAG( Tag1, Tag2, ResultTag ) \
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template<> struct inner_demote_iterator_traversal_tag< Tag1 , Tag2 > \
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{ \
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typedef ResultTag type; \
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};
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BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, no_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, incrementable_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, single_pass_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, forward_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, bidirectional_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( no_traversal_tag, random_access_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, no_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, single_pass_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, forward_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, bidirectional_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( incrementable_traversal_tag, random_access_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, no_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, forward_traversal_tag, single_pass_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, bidirectional_traversal_tag, single_pass_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( single_pass_traversal_tag, random_access_traversal_tag, single_pass_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, no_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, forward_traversal_tag, forward_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, bidirectional_traversal_tag, forward_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( forward_traversal_tag, random_access_traversal_tag, forward_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, no_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, forward_traversal_tag, forward_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, bidirectional_traversal_tag, bidirectional_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( bidirectional_traversal_tag, random_access_traversal_tag, bidirectional_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, no_traversal_tag, no_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, incrementable_traversal_tag, incrementable_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, single_pass_traversal_tag, single_pass_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, forward_traversal_tag, forward_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, bidirectional_traversal_tag, bidirectional_traversal_tag )
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BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, random_access_traversal_tag, random_access_traversal_tag )
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#undef BOOST_DEMOTE_TRAVERSAL_TAG
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template<class IteratorTraversalTag1, class IteratorTraversalTag2>
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struct demote_iterator_traversal_tag
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: inner_demote_iterator_traversal_tag<
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typename boost::iterators::pure_traversal_tag< IteratorTraversalTag1 >::type,
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typename boost::iterators::pure_traversal_tag< IteratorTraversalTag2 >::type
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>
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{
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};
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} // namespace range_detail
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} // namespace boost
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#endif // include guard
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