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Iterators

Iterators. A pure abstraction. Introduction. “Iterators are the glue that holds containers and algorithms togther”. P 549 The C++ Programming Language, Bjarne Stroustrup They provide an abstract view of data Iterators support an abstract model of data as sequences. Iterators and Sequences.

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Iterators

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  1. Iterators A pure abstraction

  2. Introduction • “Iterators are the glue that holds containers and algorithms togther”. • P 549 The C++ Programming Language, Bjarne Stroustrup • They provide an abstract view of data • Iterators support an abstract model of data as sequences.

  3. Iterators and Sequences • An iterator is pure abstraction • Anything that behaves like an iterator is an iterator • An iterator is an abstraction of a pointer to an element of a sequence • For example, an int* is an interator to int[]

  4. More Iterator Issues • There is no concept of a “null iterator” • An iterator that points to nothing typically points to the same value as “one past the end” and should be compared to that same value • If an iterator points to an element, it is said to be valid.

  5. Const Iterators • Const iterators support the same behavior as non-const interators with the major exception that const iterators are not allow to modify the container to which they point.

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