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Improved category handling in iterator_adaptor.

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[SVN r19231]
This commit is contained in:
Thomas Witt
2003-07-20 19:18:40 +00:00
parent 3fe0d4b532
commit ed8c60c20b
6 changed files with 90 additions and 27 deletions
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19
include/boost/iterator/detail/categories.hpp
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@ -329,6 +329,25 @@ namespace boost
template <> struct minimum_category<int, int> { typedef minimum_category type; };
# endif
//
// Tag classification for use in iterator_adaptor
//
template <class Tag>
struct is_access_tag
: mpl::or_<
is_tag<readable_iterator_tag, Tag>
, mpl::or_<
is_tag<writable_iterator_tag, Tag>
, is_tag<swappable_iterator_tag, Tag>
>
>
{};
template <class Tag>
struct is_traversal_tag
: is_tag<incrementable_traversal_tag, Tag>
{};
} // namespace detail
} // namespace boost