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</ div >
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< div class = "section" title = "Forward Sequence" >
< div class = "titlepage" >< div >< div >< h4 class = "title" >
< a name = "fusion.sequence.concepts.forward_sequence" ></ a >< a class = "link" href = "forward_sequence.html" title = "Forward Sequence" > Forward
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Sequence</ a >
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</ h4 ></ div ></ div ></ div >
< a name = "fusion.sequence.concepts.forward_sequence.description" ></ a >< h6 >
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< a name = "id646343" ></ a >
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< a class = "link" href = "forward_sequence.html#fusion.sequence.concepts.forward_sequence.description" > Description</ a >
</ h6 >
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< p >
A Forward Sequence is a Sequence whose elements are arranged in a definite
order. The ordering is guaranteed not to change from iteration to iteration.
The requirement of a definite ordering allows the definition of element-by-element
equality (if the container's element type is Equality Comparable) and of
lexicographical ordering (if the container's element type is LessThan Comparable).
</ 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 Forward 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 Forward Sequence type
</ 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.forward_sequence.valid_expressions" ></ a >< h6 >
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< a name = "id646442" ></ a >
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< a class = "link" href = "forward_sequence.html#fusion.sequence.concepts.forward_sequence.valid_expressions" > Valid
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Expressions</ a >
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</ h6 >
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< p >
For any Forward Sequence the following expressions must be valid:
</ 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/forward_iterator.html" title = "Forward Iterator" > Forward
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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 >
< 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/forward_iterator.html" title = "Forward Iterator" > Forward
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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 >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/size.html" title = "size" >< code class = "computeroutput" >< span class = "identifier" > size</ span ></ code ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
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< a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
Integral Constant</ a > . Convertible to int.
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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/empty.html" title = "empty" >< code class = "computeroutput" >< span class = "identifier" > empty</ span ></ code ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
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< a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
Boolean Constant</ a > . Convertible to bool.
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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/front.html" title = "front" >< code class = "computeroutput" >< span class = "identifier" > front</ span ></ code ></ a >< 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/front.html" title = "front" >< code class = "computeroutput" >< span class = "identifier" > front</ span ></ code ></ a >< 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.forward_sequence.result_type_expressions" ></ a >< h6 >
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< a name = "id648105" ></ a >
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< a class = "link" href = "forward_sequence.html#fusion.sequence.concepts.forward_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/size.html" title = "size" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > size</ 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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Unspecified
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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/empty.html" title = "empty" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > empty</ 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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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/front.html" title = "front" >< code class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > front</ 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 >
</ tbody >
</ table ></ div >
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< a name = "fusion.sequence.concepts.forward_sequence.expression_semantics" ></ a >< h6 >
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< a name = "id648411" ></ a >
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< a class = "link" href = "forward_sequence.html#fusion.sequence.concepts.forward_sequence.expression_semantics" > Expression
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Semantics</ 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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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/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 >
An iterator to the first element of the sequence; see < a class = "link" href = "../intrinsic/functions/begin.html" title = "begin" >< code class = "computeroutput" >< span class = "identifier" > begin</ span ></ code ></ a > .
</ 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 past-the-end iterator to the sequence; see < a class = "link" href = "../intrinsic/functions/end.html" title = "end" >< code class = "computeroutput" >< span class = "identifier" > end</ span ></ code ></ a > .
</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/size.html" title = "size" >< code class = "computeroutput" >< span class = "identifier" > size</ span ></ code ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
The size of the sequence; see < a class = "link" href = "../intrinsic/functions/size.html" title = "size" >< code class = "computeroutput" >< span class = "identifier" > size</ span ></ code ></ a > .
</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/empty.html" title = "empty" >< code class = "computeroutput" >< span class = "identifier" > empty</ span ></ code ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
A boolean Integral Constant < code class = "computeroutput" >< span class = "identifier" > c</ span ></ code >
such that < code class = "computeroutput" >< span class = "identifier" > c</ span >< span class = "special" > ::</ span >< span class = "identifier" > value</ span > < span class = "special" > ==</ span >
< span class = "keyword" > true</ span ></ code > if and only if the
sequence is empty; see < a class = "link" href = "../intrinsic/functions/empty.html" title = "empty" >< code class = "computeroutput" >< span class = "identifier" > empty</ span ></ code ></ a > .
</ p >
</ td >
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</ tr >
< tr >
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< td >
< p >
< code class = "computeroutput" >< a class = "link" href = "../intrinsic/functions/front.html" title = "front" >< code class = "computeroutput" >< span class = "identifier" > front</ span ></ code ></ a >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
The first element in the sequence; see < a class = "link" href = "../intrinsic/functions/front.html" title = "front" >< code class = "computeroutput" >< span class = "identifier" > front</ span ></ code ></ a > .
</ p >
</ td >
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</ tr >
</ tbody >
</ table ></ div >
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< a name = "fusion.sequence.concepts.forward_sequence.invariants" ></ a >< h6 >
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< a name = "id648740" ></ a >
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< a class = "link" href = "forward_sequence.html#fusion.sequence.concepts.forward_sequence.invariants" > Invariants</ a >
</ h6 >
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< p >
For any Forward Sequence s the following invariants always hold:
</ p >
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< div class = "itemizedlist" >< ul class = "itemizedlist" type = "disc" >
< li class = "listitem" >
< code class = "computeroutput" >< span class = "special" > [</ span >< 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 > < 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 > is always a valid range.
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</ li >
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< li class = "listitem" >
An < a class = "link" href = "../../algorithm.html" title = "Algorithm" > Algorithm</ a > that iterates through
the range < code class = "computeroutput" >< span class = "special" > [</ span >< 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 > < 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 > will pass through every element of
< code class = "computeroutput" >< span class = "identifier" > s</ span ></ code > exactly once.
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</ li >
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< li class = "listitem" >
< 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 >
is identical to < 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 >
if and only if < code class = "computeroutput" >< span class = "identifier" > s</ span ></ code > is empty.
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</ li >
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< li class = "listitem" >
Two different iterations through < code class = "computeroutput" >< span class = "identifier" > s</ span ></ code >
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will access its elements in the same order.
</ li >
</ ul ></ div >
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< a name = "fusion.sequence.concepts.forward_sequence.models" ></ a >< h6 >
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< a name = "id648940" ></ a >
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< a class = "link" href = "forward_sequence.html#fusion.sequence.concepts.forward_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 = "../../container/cons.html" title = "cons" >< code class = "computeroutput" >< span class = "identifier" > cons</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../container/list.html" title = "list" >< code class = "computeroutput" >< span class = "identifier" > list</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../container/set.html" title = "set" >< code class = "computeroutput" >< span class = "identifier" > set</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../container/map.html" title = "map" >< code class = "computeroutput" >< span class = "identifier" > map</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../view/single_view.html" title = "single_view" >< code class = "computeroutput" >< span class = "identifier" > single_view</ span ></ code ></ a ></ li >
< li class = "listitem" >< a class = "link" href = "../../view/filter_view.html" title = "filter_view" >< code class = "computeroutput" >< span class = "identifier" > filter_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 ></ li >
< li class = "listitem" >< a class = "link" href = "../../view/joint_view.html" title = "joint_view" >< code class = "computeroutput" >< span class = "identifier" > joint_view</ span ></ code ></ a ></ li >
< 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 ></ 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/zip_view.html" title = "zip_view" >< code class = "computeroutput" >< span class = "identifier" > zip_view</ span ></ code ></ a ></ li >
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</ ul ></ div >
</ div >
< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" >< tr >
< td align = "left" ></ td >
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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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</ p >
</ div ></ td >
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</ tr ></ table >
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