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C++ concepts: ForwardIterator

From cppreference.com
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A ForwardIterator is an Iterator that can read data from the pointed-to element.

Unlike an InputIterator, it guarantees validity when used in multipass algorithms.

[edit] Requirements

In addition to the above requirements, for a type It to be an ForwardIterator, an instance i of It must:

Expression Return Equivalent expression Notes
++i iterator i=std::next(i); return i; After this, copies of i are still valid
i++ iterator iterator ip=i; i=std::next(i); return ip;
*i++ reference value_type& temp=*i; ++i; return temp;

A mutable ForwardIterator is a ForwardIterator that additionally satisfies the OutputIterator requirements.

A value-initialized ForwardIterator behaves like the past-the-end iterator of some unspecified empty container: it compares equal to all value-initialized ForwardIterators of the same type. (since C++14)

[edit] See also