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< div class = "section" title = "Random Access Sequence" >
< div class = "titlepage" >< div >< div >< h4 class = "title" >
< a name = "fusion.sequence.concepts.random_access_sequence" ></ a >< a class = "link" href = "random_access_sequence.html" title = "Random Access Sequence" > Random
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Access Sequence</ a >
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</ h4 ></ div ></ div ></ div >
< a name = "fusion.sequence.concepts.random_access_sequence.description" ></ a >< h6 >
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< a name = "id650142" ></ a >
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< a class = "link" href = "random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.description" > Description</ a >
</ h6 >
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< p >
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A Random Access Sequence is a < a class = "link" href = "bidirectional_sequence.html" title = "Bidirectional Sequence" > Bidirectional
Sequence</ a > whose iterators model < a class = "link" href = "../../iterator/concepts/random_access_iterator.html" title = "Random Access Iterator" > Random
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Access Iterator</ a > . It guarantees constant time access to arbitrary
sequence elements.
</ p >
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< a name = "fusion.sequence.concepts.random_access_sequence.refinement_of" ></ a >< h6 >
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< a name = "id650173" ></ a >
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< a class = "link" href = "random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.refinement_of" > Refinement
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of</ a >
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</ h6 >
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< p >
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< a class = "link" href = "bidirectional_sequence.html" title = "Bidirectional Sequence" > Bidirectional
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Sequence</ a >
</ p >
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< div class = "variablelist" title = "Notation" >
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< p class = "title" >< b > Notation</ b ></ p >
< dl >
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< dt >< span class = "term" >< code class = "computeroutput" >< span class = "identifier" > s</ span ></ code ></ span ></ dt >
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< dd >< p >
A Random Access Sequence
</ p ></ dd >
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< dt >< span class = "term" >< code class = "computeroutput" >< span class = "identifier" > S</ span ></ code ></ span ></ dt >
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< dd >< p >
A Random Access Sequence type
</ p ></ dd >
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< dt >< span class = "term" >< code class = "computeroutput" >< span class = "identifier" > N</ span ></ code ></ span ></ dt >
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< dd >< p >
An < a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
Integral Constant</ a >
</ p ></ dd >
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< dt >< span class = "term" >< code class = "computeroutput" >< span class = "identifier" > o</ span ></ code ></ span ></ dt >
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< dd >< p >
An arbitrary object
</ p ></ dd >
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< dt >< span class = "term" >< code class = "computeroutput" >< span class = "identifier" > e</ span ></ code ></ span ></ dt >
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< dd >< p >
A Sequence element
</ p ></ dd >
</ dl >
</ div >
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< a name = "fusion.sequence.concepts.random_access_sequence.valid_expressions" ></ a >< h6 >
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< a name = "id650300" ></ a >
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< a class = "link" href = "random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.valid_expressions" > Valid
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Expressions</ a >
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</ h6 >
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< p >
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In addition to the requirements defined in < a class = "link" href = "bidirectional_sequence.html" title = "Bidirectional Sequence" > Bidirectional
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Sequence</ a > , for any Random Access Sequence the following must be met:
</ p >
< div class = "informaltable" >< table class = "table" >
< colgroup >
< col >
< col >
< col >
< col >
</ colgroup >
< thead >< tr >
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< th >
< p >
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Expression
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</ p >
</ th >
< th >
< p >
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Return type
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</ p >
</ th >
< th >
< p >
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Type Requirements
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</ p >
</ th >
< th >
< p >
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Runtime Complexity
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</ p >
</ th >
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</ tr ></ thead >
< tbody >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/begin.html" title = "begin" >< code class = "computeroutput" >< span class = "identifier" > begin</ span ></ code ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
< a class = "link" href = "../../iterator/concepts/random_access_iterator.html" title = "Random Access Iterator" > Random
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Access Iterator</ a >
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</ p >
</ td >
< td >
< p >
</ p >
</ td >
< td >
< p >
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Constant
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</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/end.html" title = "end" >< code class = "computeroutput" >< span class = "identifier" > end</ span ></ code ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
< a class = "link" href = "../../iterator/concepts/random_access_iterator.html" title = "Random Access Iterator" > Random
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Access Iterator</ a >
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</ p >
</ td >
< td >
< p >
</ p >
</ td >
< td >
< p >
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Constant
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</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/at.html" title = "at" >< code class = "computeroutput" >< span class = "identifier" > at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > N</ span >< span class = "special" > > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
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Any type
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</ p >
</ td >
< td >
< p >
</ p >
</ td >
< td >
< p >
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Constant
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</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/at.html" title = "at" >< code class = "computeroutput" >< span class = "identifier" > at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > N</ span >< span class = "special" > > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span >
< span class = "special" > =</ span > < span class = "identifier" > o</ span ></ code >
</ p >
</ td >
< td >
< p >
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Any type
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</ p >
</ td >
< td >
< p >
< code class = "computeroutput" >< span class = "identifier" > s</ span ></ code > is mutable and
< code class = "computeroutput" >< span class = "identifier" > e</ span > < span class = "special" > =</ span >
< span class = "identifier" > o</ span ></ code > , where < code class = "computeroutput" >< span class = "identifier" > e</ span ></ code > is the first element in the
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sequence, is a valid expression.
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</ p >
</ td >
< td >
< p >
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Constant
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</ p >
</ td >
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</ tr >
</ tbody >
</ table ></ div >
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< a name = "fusion.sequence.concepts.random_access_sequence.result_type_expressions" ></ a >< h6 >
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< a name = "id650639" ></ a >
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< a class = "link" href = "random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.result_type_expressions" > Result
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Type Expressions</ a >
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</ h6 >
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< div class = "informaltable" >< table class = "table" >
< colgroup >
< col >
< col >
</ colgroup >
< thead >< tr >
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< th >
< p >
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Expression
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</ p >
</ th >
< th >
< p >
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Compile Time Complexity
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</ p >
</ th >
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</ tr ></ thead >
< tbody >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/metafunctions/begin.html" title = "begin" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > begin</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ code >
</ p >
</ td >
< td >
< p >
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Amortized constant time
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</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/metafunctions/end.html" title = "end" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > end</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ code >
</ p >
</ td >
< td >
< p >
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Amortized constant time
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</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/metafunctions/at.html" title = "at" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > ,</ span >
< span class = "identifier" > N</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ code >
</ p >
</ td >
< td >
< p >
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Amortized constant time
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</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/metafunctions/value_at.html" title = "value_at" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > value_at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > ,</ span >
< span class = "identifier" > N</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ code >
</ p >
</ td >
< td >
< p >
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Amortized constant time
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</ p >
</ td >
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</ tr >
</ tbody >
</ table ></ div >
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< div class = "sidebar" >
< p class = "title" >< b ></ b ></ p >
< p >
< span class = "inlinemediaobject" >< img src = "../../../images/note.png" alt = "note" ></ span > < code class = "computeroutput" >< a class = "link" href = "../intrinsic/metafunctions/at.html" title = "at" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > ,</ span > < span class = "identifier" > N</ span >< span class = "special" > > </ span ></ code > returns the actual type returned by
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/at.html" title = "at" >< code class = "computeroutput" >< span class = "identifier" > at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > N</ span >< span class = "special" > > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code > . In
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most cases, this is a reference. Hence, there is no way to know the exact
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element type using < code class = "computeroutput" >< a class = "link" href = "../intrinsic/metafunctions/at.html" title = "at" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > ,</ span > < span class = "identifier" > N</ span >< span class = "special" > > </ span ></ code > .The element at < code class = "computeroutput" >< span class = "identifier" > N</ span ></ code >
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may actually be a reference to begin with. For this purpose, you can use
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< code class = "computeroutput" >< a class = "link" href = "../intrinsic/metafunctions/value_at.html" title = "value_at" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > value_at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > ,</ span > < span class = "identifier" > N</ span >< span class = "special" > > </ span ></ code > .
</ p >
</ div >
< a name = "fusion.sequence.concepts.random_access_sequence.expression_semantics" ></ a >< h6 >
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< a name = "id651085" ></ a >
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< a class = "link" href = "random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.expression_semantics" > Expression
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Semantics</ a >
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</ h6 >
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< p >
The semantics of an expression are defined only where they differ from,
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or are not defined in < a class = "link" href = "bidirectional_sequence.html" title = "Bidirectional Sequence" > Bidirectional
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Sequence</ a > .
</ p >
< div class = "informaltable" >< table class = "table" >
< colgroup >
< col >
< col >
</ colgroup >
< thead >< tr >
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< th >
< p >
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Expression
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</ p >
</ th >
< th >
< p >
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Semantics
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</ p >
</ th >
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</ tr ></ thead >
< tbody >< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/at.html" title = "at" >< code class = "computeroutput" >< span class = "identifier" > at</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "identifier" > N</ span >< span class = "special" > > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
The Nth element from the beginning of the sequence; see < a class = "link" href = "../intrinsic/functions/at.html" title = "at" >< code class = "computeroutput" >< span class = "identifier" > at</ span ></ code ></ a > .
</ p >
</ td >
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</ tr ></ tbody >
</ table ></ div >
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< a name = "fusion.sequence.concepts.random_access_sequence.models" ></ a >< h6 >
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< a name = "id651197" ></ a >
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< a class = "link" href = "random_access_sequence.html#fusion.sequence.concepts.random_access_sequence.models" > Models</ a >
</ h6 >
< div class = "itemizedlist" >< ul class = "itemizedlist" type = "disc" >
< li class = "listitem" >< a class = "link" href = "../../adapted/std__pair.html" title = "std::pair" >< code class = "computeroutput" >< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > pair</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../adapted/boost__array.html" title = "boost::array" >< code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > array</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../container/vector.html" title = "vector" >< code class = "computeroutput" >< span class = "identifier" > vector</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../view/reverse_view.html" title = "reverse_view" >< code class = "computeroutput" >< span class = "identifier" > reverse_view</ span ></ code ></ a ></ li >
< li class = "listitem" >
< a class = "link" href = "../../view/iterator_range.html" title = "iterator_range" >< code class = "computeroutput" >< span class = "identifier" > iterator_range</ span ></ code ></ a >
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(where adapted sequence is a Random Access Sequence)
</ li >
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< li class = "listitem" >
< a class = "link" href = "../../view/transform_view.html" title = "transform_view" >< code class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ code ></ a >
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(where adapted sequence is a Random Access Sequence)
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< a class = "link" href = "../../view/zip_view.html" title = "zip_view" >< code class = "computeroutput" >< span class = "identifier" > zip_view</ span ></ code ></ a >
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(where adapted sequences are models of Random Access Sequence)
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< td align = "right" >< div class = "copyright-footer" > Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger< p >
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt</ a > )
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