std::iterator

From cppreference.com
Defined in header <iterator>
template< class Category,

          class T,
          class Distance = std::ptrdiff_t,
          class Pointer = T*,
          class Reference = T&

         > struct iterator;

std::iterator is the base class provided to simplify definitions of the required types for iterators.

[edit] Member types

Member type Definition
value_type T
difference_type Distance
pointer Pointer
reference Reference
iterator_category Category

[edit] See also

provides uniform interface to the properties of an iterator
(class template)
empty class types used to indicate iterator categories
(class)