2004-11-28 03:35:12 +00:00
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2004-11-28 03:35:12 +00:00
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< title > The MPL Reference Manual: Random Access Iterator</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./bidirectional-iterator.html" class = "navigation-link" > Prev</ a > < a href = "./iterator-metafunctions.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./bidirectional-iterator.html" class = "navigation-link" > Back</ a > Along</ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./iterators-concepts.html" class = "navigation-link" > Up</ a > < a href = "../refmanual.html" class = "navigation-link" > Home</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./refmanual_toc.html" class = "navigation-link" > Full TOC</ a ></ span ></ td >
< td class = "header-group page-location" >< a href = "../refmanual.html" class = "navigation-link" > Front Page</ a > / < a href = "./iterators.html" class = "navigation-link" > Iterators</ a > / < a href = "./iterators-concepts.html" class = "navigation-link" > Concepts</ a > / < a href = "./random-access-iterator.html" class = "navigation-link" > Random Access Iterator</ a ></ td >
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< div class = "section" id = "random-access-iterator" >
< h1 >< a class = "toc-backref" href = "./iterators-concepts.html#id380" name = "random-access-iterator" > Random Access Iterator</ a ></ h1 >
< div class = "section" id = "iterators-random-description" >
< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
< p > A < a class = "reference" href = "./random-access-iterator.html" > Random Access Iterator</ a > is a < a class = "reference" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a > that provides
constant-time guarantees on moving the iterator an arbitrary number of positions
forward or backward and for measuring the distance to another iterator in the
same sequence.</ p >
</ div >
< div class = "section" id = "iterators-random-refinement-of" >
< h3 >< a class = "subsection-title" href = "#refinement-of" name = "refinement-of" > Refinement of</ a ></ h3 >
< p >< a class = "reference" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a ></ p >
</ div >
< div class = "section" id = "iterators-random-expression-requirements" >
< h3 >< a class = "subsection-title" href = "#expression-requirements" name = "expression-requirements" > Expression requirements</ a ></ h3 >
< p > In addition to the requirements defined in < a class = "reference" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a > ,
the following requirements must be met.</ p >
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< tr >< th > Expression</ th >
< th > Type</ th >
< th > Complexity</ th >
</ tr >
</ thead >
< tbody valign = "top" >
< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./next.html" class = "identifier" > next</ a > < i> ::type</ span ></ tt ></ td >
< td >< a class = "reference" href = "./random-access-iterator.html" > Random Access Iterator</ a ></ td >
< td > Amortized constant time</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./prior.html" class = "identifier" > prior</ a > < i> ::type</ span ></ tt ></ td >
< td >< a class = "reference" href = "./random-access-iterator.html" > Random Access Iterator</ a ></ td >
< td > Amortized constant time</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > i::category</ span ></ tt ></ td >
< td >< a class = "reference" href = "./integral-constant.html" > Integral Constant</ a > , convertible
to < tt class = "literal" >< span class = "pre" > random_access_iterator_tag</ span ></ tt ></ td >
< td > Constant time</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./advance.html" class = "identifier" > advance</ a > < i,n> ::type</ span ></ tt ></ td >
< td >< a class = "reference" href = "./random-access-iterator.html" > Random Access Iterator</ a ></ td >
< td > Amortized constant time</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./distance.html" class = "identifier" > distance</ a > < i,j> ::type</ span ></ tt ></ td >
< td >< a class = "reference" href = "./integral-constant.html" > Integral Constant</ a ></ td >
< td > Amortized constant time</ td >
</ tr >
</ tbody >
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< div class = "section" id = "iterators-random-expression-semantics" >
< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
< pre class = "literal-block" >
typedef < a href = "./advance.html" class = "identifier" > advance</ a > < i,n> ::type j;
</ pre >
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< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" > See < tt class = "literal" >< span class = "pre" >< a href = "./advance.html" class = "identifier" > advance</ a ></ span ></ tt > specification</ td >
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< pre class = "literal-block" >
typedef < a href = "./distance.html" class = "identifier" > distance</ a > < i,j> ::type n;
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< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" > See < tt class = "literal" >< span class = "pre" >< a href = "./distance.html" class = "identifier" > distance</ a ></ span ></ tt > specification</ td >
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</ tbody >
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< div class = "section" id = "random-invariants" >
< h3 >< a class = "subsection-title" href = "#invariants" name = "invariants" > Invariants</ a ></ h3 >
< p > For any random access iterators < tt class = "literal" >< span class = "pre" > i</ span ></ tt > and < tt class = "literal" >< span class = "pre" > j</ span ></ tt > the following invariants always
hold:</ p >
< ul class = "simple" >
< li > If < tt class = "literal" >< span class = "pre" >< a href = "./advance.html" class = "identifier" > advance</ a > < i,n> ::type</ span ></ tt > is well-defined, then
< tt class = "literal" >< span class = "pre" >< a href = "./advance.html" class = "identifier" > advance</ a > < </ span > < span class = "pre" >< a href = "./advance.html" class = "identifier" > advance</ a > < i,n> ::type,</ span > < span class = "pre" >< a href = "./negate.html" class = "identifier" > negate</ a > < n> ::type</ span > < span class = "pre" > > ::type</ span ></ tt > is a null operation.</ li >
</ ul >
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< div class = "section" id = "iterators-random-see-also" >
< h3 >< a class = "subsection-title" href = "#see-also" name = "see-also" > See also</ a ></ h3 >
< p >< a class = "reference" href = "./iterators.html" > Iterators</ a > , < a class = "reference" href = "./bidirectional-iterator.html" > Bidirectional Iterator</ a > , < a class = "reference" href = "./random-access-sequence.html" > Random Access Sequence</ a > , < a class = "refentry reference" href = "./advance.html" >< tt class = "refentry literal" >< span class = "pre" > advance</ span ></ tt ></ a > , < a class = "refentry reference" href = "./distance.html" >< tt class = "refentry literal" >< span class = "pre" > distance</ span ></ tt ></ a ></ p >
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