Keywords: ISO C++, library

Chapter 27. Iterators
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## Chapter 27. Iterators

24.3.2 describes `struct iterator`, which didn't exist in the original HP STL implementation (the language wasn't rich enough at the time). For backwards compatibility, base classes are provided which declare the same nested typedefs:

- input_iterator

- output_iterator

- forward_iterator

- bidirectional_iterator

- random_access_iterator

24.3.4 describes iterator operation `distance`, which takes two iterators and returns a result. It is extended by another signature which takes two iterators and a reference to a result. The result is modified, and the function returns nothing.

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