Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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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::iterators::pure_traversal_tag< IteratorTraversalTag1 >::type,
+        typename boost::iterators::pure_traversal_tag< IteratorTraversalTag2 >::type
+      >
+{
+};
+
+    } // namespace range_detail
+} // namespace boost
+
+#endif // include guard