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Readable Iterator Concept

A class or built-in type X models the Readable Iterator concept for value type T if, in addition to X being Assignable and Copy Constructible, the following expressions are valid and respect the stated semantics. U is the type of any specified member of type T.

Readable Iterator Requirements (in addition to Assignable and Copy Constructible)
Expression Return Type Note/Precondition
iterator_traits<X>::value_type T Any non-reference, non-cv-qualified type
*a Convertible to T
pre: a is dereferenceable. If a == b then *a
is equivalent to *b.
a->m U& pre: pre: (*a).m is well-defined. Equivalent to (*a).m.