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| Category: iterators | | Component type: type |
Description
Bidirectional_iterator_tag is an empty class: it has no member functions, member variables, or nested types. It is used solely as a "tag": a representation of the BidirectionalIterator concept within the C++ type system. Specifically, it is used as a return value for the function iterator_category. iterator_category takes a single argument, an iterator, and returns an object whose type depends on the iterator's category. iterator_category's return value is of type bidirectional_iterator_tag if its argument is a BidirectionalIterator.
Example
See iterator_category
Definition
Defined in the standard header iterator, and in the nonstandard backward-compatibility header iterator.h.
Template parameters
None.
Model of
Assignable
Type requirements
None.
Public base classes
None.
Members
None.
New Members
None.
Notes
See also
iterator_category, iterator_tags, iterator_traits, output_iterator_tag, input_iterator_tag, forward_iterator_tag random_access_iterator_tag
