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The following function distinguishes between circulators and iterators. It is based on iterator traits [C++98, Mye95] and Circulator_traits.
#include <CGAL/circulator.h>
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| if the iterator category of I belongs to an iterator. | ||
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| if the iterator category of C belongs to a circulator. | ||
Circulator_tag, Circulator_traits, Assert_circulator, Circulator.