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[range] - Fix for the demotion of traversal tags supplied by aschoedl. This is mentioned in Trac issue 5061, but has also been reported independently by a few users.

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[SVN r70040]
This commit is contained in:
Neil Groves
2011-03-16 23:47:02 +00:00
parent cc8a1413cb
commit c6a6a46db4
1 changed files with 14 additions and 2 deletions
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16
include/boost/range/detail/demote_iterator_traversal_tag.hpp
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@ -5,6 +5,9 @@
// 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/
//
@ -19,12 +22,12 @@ namespace boost
{
template<class IteratorTraversalTag1, class IteratorTraversalTag2>
struct demote_iterator_traversal_tag
struct inner_demote_iterator_traversal_tag
{
};
#define BOOST_DEMOTE_TRAVERSAL_TAG( Tag1, Tag2, ResultTag ) \
template<> struct demote_iterator_traversal_tag< Tag1 , Tag2 > \
template<> struct inner_demote_iterator_traversal_tag< Tag1 , Tag2 > \
{ \
typedef ResultTag type; \
};
@ -73,6 +76,15 @@ BOOST_DEMOTE_TRAVERSAL_TAG( random_access_traversal_tag, random_access_traversal
#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