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< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" >
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< title > Bidirectional
Sequence</ title >
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< link rel = "stylesheet" href = "../../../../../../../doc/html/boostbook.css" type = "text/css" >
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<<<<<< < .working
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< meta name = "generator" content = "DocBook XSL Stylesheets V1.65.1" >
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=======
< meta name = "generator" content = "DocBook XSL Stylesheets V1.75.1" >
>>>>>>> .merge-right.r57125
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< link rel = "home" href = "../../../index.html" title = "Chapter >
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< link rel = "up" href = "../concepts.html" title = "Concepts" >
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< link rel = "previous" href = "forward_sequence.html" title = "Forward
Sequence" >
< link rel = "next" href = "random_access_sequence.html" title = "Random
Access Sequence" >
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</ head >
< body bgcolor = "white" text = "black" link = "#0000FF" vlink = "#840084" alink = "#0000FF" >
< table cellpadding = "2" width = "100%" >< tr >
< td valign = "top" >< img alt = "Boost C++ Libraries" width = "277" height = "86" src = "../../../../../../../boost.png" ></ td >
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< td align = "center" >< a href = "../../../../../../../index.html" > Home</ a ></ td >
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< td align = "center" >< a href = "../../../../../../libraries.htm" > Libraries</ a ></ td >
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< td align = "center" >< a href = "http://www.boost.org/users/people.html" > People</ a ></ td >
< td align = "center" >< a href = "http://www.boost.org/users/faq.html" > FAQ</ a ></ td >
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< td align = "center" >< a href = "../../../../../../../more/index.htm" > More</ a ></ td >
</ tr ></ table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "forward_sequence.html" >< img src = "../../../../../../../doc/html/images/prev.png" alt = "Prev" ></ a >< a accesskey = "u" href = "../concepts.html" >< img src = "../../../../../../../doc/html/images/up.png" alt = "Up" ></ a >< a accesskey = "h" href = "../../../index.html" >< img src = "../../../../../../../doc/html/images/home.png" alt = "Home" ></ a >< a accesskey = "n" href = "random_access_sequence.html" >< img src = "../../../../../../../doc/html/images/next.png" alt = "Next" ></ a >
</ div >
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< div class = "section" lang = "en" >
< div class = "titlepage" >
< div >< div >< h4 class = "title" >
< a name = "fusion.sequence.concepts.bidirectional_sequence" ></ a >< a href = "bidirectional_sequence.html" title = "Bidirectional
Sequence" > Bidirectional
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Sequence</ a >
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<<<<<< < .working
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</ h4 ></ div ></ div >
< div ></ div >
</ div >
< a name = "fusion.sequence.concepts.bidirectional_sequence.description" ></ a >< h5 >
< a name = "id444601" ></ a >
< a href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.description" > Description</ a >
</ h5 >
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=======
</ h4 ></ div ></ div ></ div >
< a name = "fusion.sequence.concepts.bidirectional_sequence.description" ></ a >< h6 >
< a name = "id646988" ></ a >
< a class = "link" href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.description" > Description</ a >
</ h6 >
>>>>>>> .merge-right.r57125
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< p >
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A Bidirectional Sequence is a < a href = "forward_sequence.html" title = "Forward
Sequence" > Forward
Sequence</ a > whose iterators model < a href = "../../iterator/concepts/bidirectional_iterator.html" title = "Bidirectional
Iterator" > Bidirectional
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Iterator</ a > .
</ p >
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<<<<<< < .working
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< a name = "fusion.sequence.concepts.bidirectional_sequence.refinement_of" ></ a >< h5 >
< a name = "id444649" ></ a >
< a href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.refinement_of" > Refinement
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=======
< a name = "fusion.sequence.concepts.bidirectional_sequence.refinement_of" ></ a >< h6 >
< a name = "id647019" ></ a >
< a class = "link" href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.refinement_of" > Refinement
>>>>>>> .merge-right.r57125
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of</ a >
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</ h5 >
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< p >
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< a href = "forward_sequence.html" title = "Forward
Sequence" > Forward Sequence</ a >
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</ p >
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< div class = "variablelist" >
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< p class = "title" >< b > Notation</ b ></ p >
< dl >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt ></ span ></ dt >
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< dd >< p >
A Forward Sequence
</ p ></ dd >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > S</ span ></ tt ></ span ></ dt >
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< dd >< p >
A Forward Sequence type
</ p ></ dd >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > o</ span ></ tt ></ span ></ dt >
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< dd >< p >
An arbitrary object
</ p ></ dd >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > e</ span ></ tt ></ span ></ dt >
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< dd >< p >
A Sequence element
</ p ></ dd >
</ dl >
</ div >
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<<<<<< < .working
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< a name = "fusion.sequence.concepts.bidirectional_sequence.valid_expressions" ></ a >< h5 >
< a name = "id444786" ></ a >
< a href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.valid_expressions" > Valid
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=======
< a name = "fusion.sequence.concepts.bidirectional_sequence.valid_expressions" ></ a >< h6 >
< a name = "id647122" ></ a >
< a class = "link" href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.valid_expressions" > Valid
>>>>>>> .merge-right.r57125
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Expressions</ a >
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</ h5 >
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< p >
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In addition to the requirements defined in < a href = "forward_sequence.html" title = "Forward
Sequence" > Forward
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Sequence</ a > , for any Bidirectional 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 >
< tt class = "computeroutput" >< a href = "../intrinsic/functions/begin.html" title = "begin" >< tt class = "computeroutput" >< span class = "identifier" > begin</ span ></ tt ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ tt >
</ p ></ td >
< td >< p >
< a href = "../../iterator/concepts/bidirectional_iterator.html" title = "Bidirectional
Iterator" > Bidirectional
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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 >
< tt class = "computeroutput" >< a href = "../intrinsic/functions/end.html" title = "end" >< tt class = "computeroutput" >< span class = "identifier" > end</ span ></ tt ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ tt >
</ p ></ td >
< td >< p >
< a href = "../../iterator/concepts/bidirectional_iterator.html" title = "Bidirectional
Iterator" > Bidirectional
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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 >
< tt class = "computeroutput" >< a href = "../intrinsic/functions/back.html" title = "back" >< tt class = "computeroutput" >< span class = "identifier" > back</ span ></ tt ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ tt >
</ 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 >
< tt class = "computeroutput" >< a href = "../intrinsic/functions/back.html" title = "back" >< tt class = "computeroutput" >< span class = "identifier" > back</ span ></ tt ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span >
< span class = "special" > =</ span > < span class = "identifier" > o</ span ></ tt >
</ p ></ td >
< td >< p >
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Any type
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</ p ></ td >
< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt > is mutable and
< tt class = "computeroutput" >< span class = "identifier" > e</ span > < span class = "special" > =</ span >
< span class = "identifier" > o</ span ></ tt > , where < tt class = "computeroutput" >< span class = "identifier" > e</ span ></ tt > 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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<<<<<< < .working
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< a name = "fusion.sequence.concepts.bidirectional_sequence.result_type_expressions" ></ a >< h5 >
< a name = "id445223" ></ a >
< a href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.result_type_expressions" > Result
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=======
< a name = "fusion.sequence.concepts.bidirectional_sequence.result_type_expressions" ></ a >< h6 >
< a name = "id647446" ></ a >
< a class = "link" href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.result_type_expressions" > Result
>>>>>>> .merge-right.r57125
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Type Expressions</ a >
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</ h5 >
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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 >
< tt class = "computeroutput" >< a href = "../intrinsic/metafunctions/begin.html" title = "begin" >< tt class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > begin</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ tt >
</ 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 >
< tt class = "computeroutput" >< a href = "../intrinsic/metafunctions/end.html" title = "end" >< tt class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > end</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ tt >
</ 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 >
< tt class = "computeroutput" >< a href = "../intrinsic/metafunctions/back.html" title = "back" >< tt class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > back</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > S</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ tt >
</ 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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<<<<<< < .working
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< a name = "fusion.sequence.concepts.bidirectional_sequence.expression_semantics" ></ a >< h5 >
< a name = "id445497" ></ a >
< a href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.expression_semantics" > Expression
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=======
< a name = "fusion.sequence.concepts.bidirectional_sequence.expression_semantics" ></ a >< h6 >
< a name = "id647649" ></ a >
< a class = "link" href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.expression_semantics" > Expression
>>>>>>> .merge-right.r57125
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Semantics</ a >
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</ h5 >
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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 href = "forward_sequence.html" title = "Forward
Sequence" > Forward
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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 >
< tt class = "computeroutput" >< a href = "../intrinsic/functions/back.html" title = "back" >< tt class = "computeroutput" >< span class = "identifier" > back</ span ></ tt ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ tt >
</ p ></ td >
< td >< p >
The last element in the sequence; see < a href = "../intrinsic/functions/back.html" title = "back" >< tt class = "computeroutput" >< span class = "identifier" > back</ span ></ tt ></ a > .
</ p ></ td >
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</ tr ></ tbody >
</ table ></ div >
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<<<<<< < .working
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< a name = "fusion.sequence.concepts.bidirectional_sequence.models" ></ a >< h5 >
< a name = "id445649" ></ a >
< a href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_sequence.models" > Models</ a >
</ h5 >
< div class = "itemizedlist" >< ul type = "disc" >
< li >< a href = "../../adapted/std__pair.html" title = "std::pair" >< tt class = "computeroutput" >< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > pair</ span ></ tt ></ a ></ li >
< li >< a href = "../../adapted/boost__array.html" title = "boost::array" >< tt class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > array</ span ></ tt ></ a ></ li >
< li >< a href = "../../container/vector.html" title = "vector" >< tt class = "computeroutput" >< span class = "identifier" > vector</ span ></ tt ></ a ></ li >
< li >< a href = "../../view/reverse_view.html" title = "reverse_view" >< tt class = "computeroutput" >< span class = "identifier" > reverse_view</ span ></ tt ></ a ></ li >
< li >
< a href = "../../view/iterator_range.html" title = "iterator_range" >< tt class = "computeroutput" >< span class = "identifier" > iterator_range</ span ></ tt ></ a >
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=======
< a name = "fusion.sequence.concepts.bidirectional_sequence.models" ></ a >< h6 >
< a name = "id647755" ></ a >
< a class = "link" href = "bidirectional_sequence.html#fusion.sequence.concepts.bidirectional_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 >
>>>>>>> .merge-right.r57125
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(where adapted sequence is a Bidirectional Sequence)
</ li >
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< li >
< a href = "../../view/transform_view.html" title = "transform_view" >< tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt ></ a >
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(where adapted sequence is a Bidirectional Sequence)
</ li >
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< li >
< a href = "../../view/zip_view.html" title = "zip_view" >< tt class = "computeroutput" >< span class = "identifier" > zip_view</ span ></ tt ></ a >
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(where adapted sequences are models Bidirectional Sequence)
</ li >
</ ul ></ div >
</ div >
< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" >< tr >
< td align = "left" ></ td >
< td align = "right" >< div class = "copyright-footer" > Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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 > )
</ p >
</ div ></ td >
</ tr ></ table >
< hr >
< div class = "spirit-nav" >
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