iterator Struct
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An empty base struct used to ensure that a user-defined iterator class works properly with iterator_traits.
struct iterator { typedef Category iterator_category; typedef Type value_type; typedef Distance difference_type; typedef Distance distance_type; typedef Pointer pointer; typedef Reference reference; };
The template struct serves as a base type for all iterators. It defines the member types
iterator_category(a synonym for the template parameterCategory).value_type(a synonym for the template parameter Type).difference_type(a synonym for the template parameterDistance).distance_type(a synonym for the template parameterDistance)pointer(a synonym for the template parameterPointer).reference(a synonym for the template parameterReference).
Note that value_type should not be a constant type even if pointer points at an object of const Type and reference designates an object of const Type.
See iterator_traits for an example of how to declare and use the types in the iterator base class.
Header: <iterator>
Namespace: std
<iterator>
Thread Safety in the C++ Standard Library
Standard Template Library