2007-11-06 12:13:52 +00:00
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< title > transform_view</ title >
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< div class = "section" lang = "en" >
< div class = "titlepage" >< div >< div >< h3 class = "title" >
< a name = "fusion.view.transform_view" ></ a >< a href = "transform_view.html" title = "transform_view" > transform_view</ a ></ h3 ></ div ></ div ></ div >
< p >
The unary version of < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
presents a view of its underlying sequence given a unary function object
or function pointer. The binary version of < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
presents a view of 2 underlying sequences, given a binary function object
or function pointer. The < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
inherits the traversal characteristics (see < a href = "../sequence/concepts.html#fusion.sequence.concepts.traversal" > Sequence
Traversal Concept</ a > ) of its underlying sequence or sequences.
</ p >
< a name = "fusion.view.transform_view.header" ></ a >< h4 >
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< a name = "id570320" ></ a >
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< a href = "transform_view.html#fusion.view.transform_view.header" > Header</ a >
</ h4 >
< pre class = "programlisting" >
< span class = "preprocessor" > #include</ span > < span class = "special" > < </ span >< span class = "identifier" > boost</ span >< span class = "special" > /</ span >< span class = "identifier" > fusion</ span >< span class = "special" > /</ span >< span class = "identifier" > view</ span >< span class = "special" > /</ span >< span class = "identifier" > transform_view</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
< span class = "preprocessor" > #include</ span > < span class = "special" > < </ span >< span class = "identifier" > boost</ span >< span class = "special" > /</ span >< span class = "identifier" > fusion</ span >< span class = "special" > /</ span >< span class = "identifier" > include</ span >< span class = "special" > /</ span >< span class = "identifier" > transform_view</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
</ pre >
< a name = "fusion.view.transform_view.synopsis" ></ a >< h4 >
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< a name = "id570478" ></ a >
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< a href = "transform_view.html#fusion.view.transform_view.synopsis" > Synopsis</ a >
</ h4 >
< p >
< span class = "bold" >< b > Unary Version</ b ></ span >
</ p >
< pre class = "programlisting" >
< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > Sequence</ span >< span class = "special" > ,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > F1</ span >< span class = "special" > > </ span >
< span class = "keyword" > struct</ span > < span class = "identifier" > transform_view</ span >< span class = "special" > ;</ span >
</ pre >
< p >
< span class = "bold" >< b > Binary Version</ b ></ span >
</ p >
< pre class = "programlisting" >
< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > Sequence1</ span >< span class = "special" > ,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > Sequence2</ span >< span class = "special" > ,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > F2</ span >< span class = "special" > > </ span >
< span class = "keyword" > struct</ span > < span class = "identifier" > transform_view</ span >< span class = "special" > ;</ span >
</ pre >
< a name = "fusion.view.transform_view.template_parameters" ></ a >< h4 >
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< a name = "id570686" ></ a >
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< a href = "transform_view.html#fusion.view.transform_view.template_parameters" > Template parameters</ a >
</ h4 >
< div class = "informaltable" >< table class = "table" >
< colgroup >
< col >
< col >
< col >
</ colgroup >
< thead >< tr >
< th >
< p >
Parameter
</ p >
</ th >
< th >
< p >
Description
</ p >
</ th >
< th >
< p >
Default
</ p >
</ th >
</ tr ></ thead >
< tbody >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > Sequence</ span ></ tt >
</ p >
</ td >
< td >
< p >
A < a href = "../sequence/concepts/forward_sequence.html" title = "Forward
Sequence" > Forward
Sequence</ a >
</ p >
</ td >
< td >
< p >
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > Sequence1</ span ></ tt >
</ p >
</ td >
< td >
< p >
A < a href = "../sequence/concepts/forward_sequence.html" title = "Forward
Sequence" > Forward
Sequence</ a >
</ p >
</ td >
< td >
< p >
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > Sequence2</ span ></ tt >
</ p >
</ td >
< td >
< p >
A < a href = "../sequence/concepts/forward_sequence.html" title = "Forward
Sequence" > Forward
Sequence</ a >
</ p >
</ td >
< td >
< p >
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > F1</ span ></ tt >
</ p >
</ td >
< td >
< p >
A unary function object or function pointer. < tt class = "computeroutput" >< a href = "http://www.boost.org/libs/utility/utility.htm#result_of" target = "_top" >< tt class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > result_of</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > F1</ span >< span class = "special" > (</ span >< span class = "identifier" > E</ span >< span class = "special" > )> ::</ span >< span class = "identifier" > type</ span ></ tt > is the return type of an instance
of < tt class = "computeroutput" >< span class = "identifier" > F1</ span ></ tt > when called
with a value of each element type < tt class = "computeroutput" >< span class = "identifier" > E</ span ></ tt >
in the input sequence.
</ p >
</ td >
< td >
< p >
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > F2</ span ></ tt >
</ p >
</ td >
< td >
< p >
A binary function object or function pointer. < tt class = "computeroutput" >< a href = "http://www.boost.org/libs/utility/utility.htm#result_of" target = "_top" >< tt class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > result_of</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "identifier" > F2</ span >< span class = "special" > (</ span >< span class = "identifier" > E1</ span >< span class = "special" > ,</ span > < span class = "identifier" > E2</ span >< span class = "special" > )> ::</ span >< span class = "identifier" > type</ span ></ tt > is the return type of an instance
of < tt class = "computeroutput" >< span class = "identifier" > F2</ span ></ tt > when called
with a value of each corresponding pair of element type < tt class = "computeroutput" >< span class = "identifier" > E1</ span ></ tt > and < tt class = "computeroutput" >< span class = "identifier" > E2</ span ></ tt >
in the input sequences.
</ p >
</ td >
< td >
< p >
</ p >
</ td >
</ tr >
</ tbody >
</ table ></ div >
< a name = "fusion.view.transform_view.model_of" ></ a >< h4 >
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< a name = "id571151" ></ a >
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< a href = "transform_view.html#fusion.view.transform_view.model_of" > Model of</ a >
</ h4 >
< div class = "itemizedlist" >< ul type = "disc" >< li >
< a href = "../sequence/concepts/forward_sequence.html" title = "Forward
Sequence" > Forward Sequence</ a > ,
< a href = "../sequence/concepts/bidirectional_sequence.html" title = "Bidirectional
Sequence" > Bidirectional
Sequence</ a > or < a href = "../sequence/concepts/random_access_sequence.html" title = "Random
Access Sequence" > Random
Access Sequence</ a > depending on the traversal characteristics (see
< a href = "../sequence/concepts.html#fusion.sequence.concepts.traversal" > Sequence Traversal Concept</ a > )
of its underlying sequence.
</ li ></ ul ></ div >
< div class = "variablelist" >
< p class = "title" >< b > Notation</ b ></ p >
< dl >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > TV</ span ></ tt ></ span ></ dt >
< dd >< p >
A < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt > type
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > BTV</ span ></ tt ></ span ></ dt >
< dd >< p >
A binary < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
type
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > UTV</ span ></ tt ></ span ></ dt >
< dd >< p >
A unary < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
type
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > f1</ span ></ tt ></ span ></ dt >
< dd >< p >
An instance of < tt class = "computeroutput" >< span class = "identifier" > F1</ span ></ tt >
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > f2</ span ></ tt ></ span ></ dt >
< dd >< p >
An instance of < tt class = "computeroutput" >< span class = "identifier" > F2</ span ></ tt >
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt ></ span ></ dt >
< dd >< p >
An instance of < tt class = "computeroutput" >< span class = "identifier" > Sequence</ span ></ tt >
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > s1</ span ></ tt ></ span ></ dt >
< dd >< p >
An instance of < tt class = "computeroutput" >< span class = "identifier" > Sequence1</ span ></ tt >
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > s2</ span ></ tt ></ span ></ dt >
< dd >< p >
An instance of < tt class = "computeroutput" >< span class = "identifier" > Sequence2</ span ></ tt >
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > tv</ span ></ tt > ,
< tt class = "computeroutput" >< span class = "identifier" > tv2</ span ></ tt ></ span ></ dt >
< dd >< p >
Instances of < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
</ p ></ dd >
</ dl >
</ div >
< a name = "fusion.view.transform_view.expression_semantics" ></ a >< h4 >
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< a name = "id571552" ></ a >
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< a href = "transform_view.html#fusion.view.transform_view.expression_semantics" > Expression
Semantics</ a >
</ h4 >
< p >
Semantics of an expression is defined only where it differs from, or is not
defined in < a href = "../sequence/concepts/forward_sequence.html" title = "Forward
Sequence" > Forward
Sequence</ a > , < a href = "../sequence/concepts/bidirectional_sequence.html" title = "Bidirectional
Sequence" > Bidirectional
Sequence</ a > or < a href = "../sequence/concepts/random_access_sequence.html" title = "Random
Access Sequence" > Random
Access Sequence</ a > depending on the traversal characteristics (see < a href = "../sequence/concepts.html#fusion.sequence.concepts.traversal" > Sequence Traversal Concept</ a > )
of its underlying sequence or sequences.
</ p >
< div class = "informaltable" >< table class = "table" >
< colgroup >
< col >
< col >
</ colgroup >
< thead >< tr >
< th >
< p >
Expression
</ p >
</ th >
< th >
< p >
Semantics
</ p >
</ th >
</ tr ></ thead >
< tbody >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > UTV</ span >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > ,</ span > < span class = "identifier" > f1</ span >< span class = "special" > )</ span ></ tt >
</ p >
</ td >
< td >
< p >
Creates a unary < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
given sequence, < tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt >
and unary function object or function pointer, < tt class = "computeroutput" >< span class = "identifier" > f1</ span ></ tt > .
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > BTV</ span >< span class = "special" > (</ span >< span class = "identifier" > s1</ span >< span class = "special" > ,</ span > < span class = "identifier" > s2</ span >< span class = "special" > ,</ span > < span class = "identifier" > f2</ span >< span class = "special" > )</ span ></ tt >
</ p >
</ td >
< td >
< p >
Creates a binary < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
given sequences, < tt class = "computeroutput" >< span class = "identifier" > s1</ span ></ tt >
and < tt class = "computeroutput" >< span class = "identifier" > s2</ span ></ tt > and binary
function object or function pointer, < tt class = "computeroutput" >< span class = "identifier" > f2</ span ></ tt > .
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > TV</ span >< span class = "special" > (</ span >< span class = "identifier" > tv</ span >< span class = "special" > )</ span ></ tt >
</ p >
</ td >
< td >
< p >
Copy constructs a < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt >
from another < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt > ,
< tt class = "computeroutput" >< span class = "identifier" > tv</ span ></ tt > .
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< tt class = "computeroutput" >< span class = "identifier" > tv</ span > < span class = "special" > =</ span >
< span class = "identifier" > tv2</ span ></ tt >
</ p >
</ td >
< td >
< p >
Assigns to a < tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt > ,
< tt class = "computeroutput" >< span class = "identifier" > tv</ span ></ tt > , from another
< tt class = "computeroutput" >< span class = "identifier" > transform_view</ span ></ tt > ,
< tt class = "computeroutput" >< span class = "identifier" > tv2</ span ></ tt > .
</ p >
</ td >
</ tr >
</ tbody >
</ table ></ div >
< a name = "fusion.view.transform_view.example" ></ a >< h4 >
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< a name = "id572032" ></ a >
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< a href = "transform_view.html#fusion.view.transform_view.example" > Example</ a >
</ h4 >
< pre class = "programlisting" >
< span class = "keyword" > struct</ span > < span class = "identifier" > square</ span >
< span class = "special" > {</ span >
< span class = "keyword" > template</ span >< span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > Sig</ span >< span class = "special" > > </ span >
< span class = "keyword" > struct</ span > < span class = "identifier" > result</ span >< span class = "special" > ;</ span >
< span class = "keyword" > template</ span >< span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > U</ span >< span class = "special" > > </ span >
< span class = "keyword" > struct</ span > < span class = "identifier" > result</ span >< span class = "special" > < </ span >< span class = "identifier" > square</ span >< span class = "special" > (</ span >< span class = "identifier" > U</ span >< span class = "special" > )> </ span >
< span class = "special" > :</ span > < span class = "identifier" > remove_reference</ span >< span class = "special" > < </ span >< span class = "identifier" > U</ span >< span class = "special" > > </ span >
< span class = "special" > {};</ span >
< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > T</ span >< span class = "special" > > </ span >
< span class = "identifier" > T</ span > < span class = "keyword" > operator</ span >< span class = "special" > ()(</ span >< span class = "identifier" > T</ span > < span class = "identifier" > x</ span >< span class = "special" > )</ span > < span class = "keyword" > const</ span >
< span class = "special" > {</ span >
< span class = "keyword" > return</ span > < span class = "identifier" > x</ span > < span class = "special" > *</ span > < span class = "identifier" > x</ span >< span class = "special" > ;</ span >
< span class = "special" > }</ span >
< span class = "special" > };</ span >
< span class = "keyword" > typedef</ span > < a href = "../container/vector.html" title = "vector" >< tt class = "computeroutput" >< span class = "identifier" > vector</ span ></ tt ></ a >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > ,</ span > < span class = "keyword" > short</ span >< span class = "special" > ,</ span > < span class = "keyword" > double</ span >< span class = "special" > > </ span > < span class = "identifier" > vector_type</ span >< span class = "special" > ;</ span >
< span class = "identifier" > vector_type</ span > < span class = "identifier" > vec</ span >< span class = "special" > (</ span >< span class = "number" > 2</ span >< span class = "special" > ,</ span > < span class = "number" > 5</ span >< span class = "special" > ,</ span > < span class = "number" > 3.3</ span >< span class = "special" > );</ span >
< span class = "identifier" > transform_view</ span >< span class = "special" > < </ span >< span class = "identifier" > vector_type</ span >< span class = "special" > ,</ span > < span class = "identifier" > square</ span >< span class = "special" > > </ span > < span class = "identifier" > transform</ span >< span class = "special" > (</ span >< span class = "identifier" > vec</ span >< span class = "special" > ,</ span > < span class = "identifier" > square</ span >< span class = "special" > ());</ span >
< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > cout</ span > < span class = "special" > << </ span > < span class = "identifier" > transform</ span > < span class = "special" > << </ span > < span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > endl</ span >< span class = "special" > ;</ span >
</ pre >
</ 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
2007-11-07 16:22:38 +00:00
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 > )
2007-11-16 08:03:15 +00:00
</ p >
</ div ></ td >
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</ tr ></ table >
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