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added input and output traversal tags

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[SVN r319]
This commit is contained in:
Jeremy Siek
2002-07-26 19:24:44 +00:00
parent fec6f79912
commit ce20536587
1 changed files with 11 additions and 1 deletions
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12
include/boost/iterator/iterator_categories.hpp
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@@ -26,6 +26,8 @@ namespace boost {
virtual public readable_iterator_tag { };
// Traversal Categories
struct input_traversal_tag { };
struct output_traversal_tag { };
struct forward_traversal_tag { };
struct bidirectional_traversal_tag : public forward_traversal_tag { };
struct random_access_traversal_tag : public bidirectional_traversal_tag { };
@@ -102,7 +104,15 @@ namespace boost {
typename ct_if<
is_convertible<Category*, std::bidirectional_iterator_tag*>::value,
bidirectional_traversal_tag,
forward_traversal_tag
typename ct_if<
is_convertible<Category*, std::forward_iterator_tag*>::value,
forward_traversal_tag,
typename ct_if<
is_convertible<Category*, std::input_iterator_tag*>::value,
input_traversal_tag,
output_traversal_tag
>::type
>::type
>::type
>::type type;
};