Forward Traversal Concept

A class or built-in type X models the Forward Traversal concept if, in addition to X meeting the requirements of Default Constructible and Single Pass Iterator, the following expressions are valid and respect the stated semantics.

Forward Traversal Iterator Requirements (in addition to Default Constructible and Single Pass Iterator)
Expression
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X u;
++r
iterator_traits<X>::difference_type
iterator_traversal<X>::type

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