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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 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 class = "link" href = "random_access_range.html#range.concepts.random_access_range.refinement_of" > Refinement
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< a name = "range.concepts.random_access_range.valid_expressions" > < / a > < h5 >
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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 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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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 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 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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