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< title > The MPL Reference Manual: Concepts</ title >
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< div class = "section" id = "id382" >
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< h1 >< a class = "toc-backref" href = "./iterators.html#id1449" >< a class = "subsection-title" href = "#concepts" name = "concepts" > Concepts</ a ></ a ></ h1 >
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< p id = "label-iterators-concepts" > All iterators in MPL are classified into three iterator concepts, or
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< cite > categories</ cite > , named according to the type of traversal provided. The
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categories are: < a class = "reference internal" href = "./forward-iterator.html" > Forward Iterator</ a > , < a class = "reference internal" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a > , and
< a class = "reference internal" href = "./random-access-iterator.html" > Random Access Iterator</ a > . The concepts are hierarchical:
< a class = "reference internal" href = "./random-access-iterator.html" > Random Access Iterator</ a > is a refinement of < a class = "reference internal" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a > ,
which, in its turn, is a refinement of < a class = "reference internal" href = "./forward-iterator.html" > Forward Iterator</ a > .</ p >
< p > Because of the inherently immutable nature of the value access, MPL
iterators escape the problems of the traversal-only categorization
discussed at length in < a class = "citation-reference" href = "#n1550" id = "id383" > [n1550]</ a > .</ p >
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< tr >< td class = "label" >< a class = "fn-backref" href = "#id383" > [n1550]</ a ></ td >< td >< a class = "reference external" href = "http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1550.htm" target = "_top" > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1550.htm</ a ></ td ></ tr >
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< li >< a class = "reference internal" href = "./forward-iterator.html" id = "id1450" > Forward Iterator</ a ></ li >
< li >< a class = "reference internal" href = "./bidirectional-iterator.html" id = "id1451" > Bidirectional Iterator</ a ></ li >
< li >< a class = "reference internal" href = "./random-access-iterator.html" id = "id1452" > Random Access Iterator</ a ></ li >
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< td >< div class = "copyright-footer" >< div class = "copyright" > Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</ div >
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