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< div class = "section" title = "Random Access Range" >
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< a name = "range.concepts.random_access_range" ></ a >< a class = "link" href = "random_access_range.html" title = "Random Access Range" > Random Access Range</ a >
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< a name = "range.concepts.random_access_range.description" ></ a >< h5 >
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< a name = "id3057956" ></ a >
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< a class = "link" href = "random_access_range.html#range.concepts.random_access_range.description" > Description</ a >
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A range < code class = "computeroutput" >< span class = "identifier" > X</ span ></ code > where < code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > range_iterator</ span >< span class = "special" > < </ span >< span class = "identifier" > X</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ code > is a model of < a href = "../../../../../../libs/iterator/doc/new-iter-concepts.html#random-access-traversal-iterators-lib-random-access-traversal-iterators" target = "_top" > Random
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Access Traversal Iterator</ a > .
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< a name = "id3058028" ></ a >
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< a class = "link" href = "random_access_range.html#range.concepts.random_access_range.refinement_of" > Refinement
of</ a >
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< a class = "link" href = "bidirectional_range.html" title = "Bidirectional Range" > Bidirectional Range</ a >
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< a name = "id3058056" ></ a >
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< a class = "link" href = "random_access_range.html#range.concepts.random_access_range.valid_expressions" > Valid
expressions</ a >
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Name
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Expression
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Return type
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Size of range
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< code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > size</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span ></ code >
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< code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > range_size</ span >< span class = "special" > < </ span >< span class = "identifier" > X</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ code >
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< a name = "id3058203" ></ a >
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< a class = "link" href = "random_access_range.html#range.concepts.random_access_range.expression_semantics" > Expression
semantics</ a >
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Expression
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Semantics
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Postcondition
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< code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > size</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span ></ code >
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Returns the size of the Range, that is, its number of elements.
Note < code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > size</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span >
< span class = "special" > ==</ span > < span class = "number" > 0u</ span ></ code >
is equivalent to < code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > empty</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span ></ code > .
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< code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > size</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span >
< span class = "special" > > =</ span > < span class = "number" > 0</ span ></ code >
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< a name = "range.concepts.random_access_range.complexity_guarantees" ></ a >< h5 >
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< a name = "id3058429" ></ a >
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< a class = "link" href = "random_access_range.html#range.concepts.random_access_range.complexity_guarantees" > Complexity
guarantees</ a >
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< code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > size</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span ></ code > completes in amortized constant time.
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< a name = "id3058483" ></ a >
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< a class = "link" href = "random_access_range.html#range.concepts.random_access_range.invariants" > Invariants</ a >
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Range size
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< code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > size</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span ></ code >
is equal to the < code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > end</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span ></ code > - < code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > begin</ span >< span class = "special" > (</ span >< span class = "identifier" > a</ span >< span class = "special" > )</ span ></ code > .
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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