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< title > nview</ title >
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< link rel = "home" href = "../../index.html" title = "Chapter 1. Fusion 2.0" >
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</ div >
< div class = "section" title = "nview" >
< div class = "titlepage" >< div >< div >< h3 class = "title" >
< a name = "fusion.view.nview" ></ a >< a class = "link" href = "nview.html" title = "nview" > nview</ a >
</ h3 ></ div ></ div ></ div >
< a name = "fusion.view.nview.description" ></ a >< h5 >
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< a name = "id736869" ></ a >
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< a class = "link" href = "nview.html#fusion.view.nview.description" > Description</ a >
</ h5 >
< p >
< code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code > presents a view which
iterates over a given < a class = "link" href = "../sequence.html" title = "Sequence" > Sequence</ a > in
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a specified order. An < code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code >
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is constructed from an arbitrary < a class = "link" href = "../sequence.html" title = "Sequence" > Sequence</ a >
and a list of indicies specifying the elements to iterate over.
</ p >
< a name = "fusion.view.nview.header" ></ a >< h5 >
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< a name = "id736910" ></ a >
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< a class = "link" href = "nview.html#fusion.view.nview.header" > Header</ a >
</ h5 >
< 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" > nview</ 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" > nview</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
</ pre >
< a name = "fusion.view.nview.synopsis" ></ a >< h5 >
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< a name = "id737018" ></ a >
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< a class = "link" href = "nview.html#fusion.view.nview.synopsis" > Synopsis</ a >
</ h5 >
< 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" > Indicies</ span >< span class = "special" > > </ span >
< span class = "keyword" > struct</ span > < span class = "identifier" > nview</ span >< span class = "special" > ;</ span >
< 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" > int</ span > < span class = "identifier" > I1</ span >< span class = "special" > ,</ span > < span class = "keyword" > int</ span > < span class = "identifier" > I2</ span > < span class = "special" > =</ span > < span class = "special" > -</ span >< span class = "number" > 1</ span >< span class = "special" > ,</ span > < span class = "special" > ...> </ span >
< span class = "keyword" > typename</ span > < span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > nview</ span >< span class = "special" > < </ span >< span class = "identifier" > Sequence</ span >< span class = "special" > ,</ span > < span class = "identifier" > I1</ span >< span class = "special" > ,</ span > < span class = "identifier" > I2</ span >< span class = "special" > ,</ span > < span class = "special" > ...> ::</ span >< span class = "identifier" > type</ span >
< span class = "identifier" > as_nview</ span >< span class = "special" > (</ span >< span class = "identifier" > Sequence</ span >< span class = "special" > & </ span > < span class = "identifier" > s</ span >< span class = "special" > );</ span >
</ pre >
< a name = "fusion.view.nview.template_parameters" ></ a >< h5 >
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< a name = "id737226" ></ a >
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< a class = "link" href = "nview.html#fusion.view.nview.template_parameters" > Template parameters</ a >
</ h5 >
< 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 >
< code class = "computeroutput" >< span class = "identifier" > Sequence</ span ></ code >
</ p >
</ td >
< td >
< p >
An arbitrary Fusion < a class = "link" href = "../sequence/concepts/forward_sequence.html" title = "Forward Sequence" > Forward
Sequence</ a >
</ p >
</ td >
< td >
< p >
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< code class = "computeroutput" >< span class = "identifier" > Indicies</ span ></ code >
</ p >
</ td >
< td >
< p >
A < code class = "computeroutput" >< span class = "identifier" > mpl</ span >< span class = "special" > ::</ span >< span class = "identifier" > vector_c</ span >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > ,</ span > < span class = "special" > ...> </ span ></ code > holding the indicies defining
the required iteration order.
</ p >
</ td >
< td >
< p >
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< code class = "computeroutput" >< span class = "identifier" > I1</ span ></ code > , < code class = "computeroutput" >< span class = "identifier" > I2</ span ></ code > , < code class = "computeroutput" >< span class = "identifier" > I3</ span ></ code > ...
</ p >
</ td >
< td >
< p >
A list of integers specifying the required iteration order.
</ p >
</ td >
< td >
< p >
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< code class = "computeroutput" >< span class = "identifier" > INT_MAX</ span ></ code > for < code class = "computeroutput" >< span class = "identifier" > I2</ span ></ code > , < code class = "computeroutput" >< span class = "identifier" > I3</ span ></ code > ...
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</ p >
</ td >
</ tr >
</ tbody >
</ table ></ div >
< a name = "fusion.view.nview.model_of" ></ a >< h5 >
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< a name = "id737439" ></ a >
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< a class = "link" href = "nview.html#fusion.view.nview.model_of" > Model of</ a >
</ h5 >
< div class = "itemizedlist" >< ul class = "itemizedlist" type = "disc" >< li class = "listitem" >
< a class = "link" href = "../sequence/concepts/random_access_sequence.html" title = "Random Access Sequence" > Random
Access Sequence</ a > (see < a class = "link" href = "../sequence/concepts.html#fusion.sequence.concepts.traversal" > Sequence
Traversal Concept</ a > )
</ li ></ ul ></ div >
< div class = "variablelist" title = "Notation" >
< p class = "title" >< b > Notation</ b ></ p >
< dl >
< dt >< span class = "term" >< code class = "computeroutput" >< span class = "identifier" > NV</ span ></ code ></ span ></ dt >
< dd >< p >
A < code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code > type
</ p ></ dd >
< dt >< span class = "term" >< code class = "computeroutput" >< span class = "identifier" > s</ span ></ code ></ span ></ dt >
< dd >< p >
An instance of < code class = "computeroutput" >< span class = "identifier" > Sequences</ span ></ code >
</ p ></ dd >
< dt >< span class = "term" >< code class = "computeroutput" >< span class = "identifier" > nv1</ span ></ code > ,
< code class = "computeroutput" >< span class = "identifier" > nv2</ span ></ code ></ span ></ dt >
< dd >< p >
Instances of < code class = "computeroutput" >< span class = "identifier" > NV</ span ></ code >
</ p ></ dd >
</ dl >
</ div >
< a name = "fusion.view.nview.expression_semantics" ></ a >< h5 >
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< a name = "id737559" ></ a >
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< a class = "link" href = "nview.html#fusion.view.nview.expression_semantics" > Expression Semantics</ a >
</ h5 >
< p >
Semantics of an expression is defined only where it differs from, or is not
defined in < a class = "link" href = "../sequence/concepts/random_access_sequence.html" title = "Random Access Sequence" > Random
Access Sequence</ a > .
</ 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 >
< code class = "computeroutput" >< span class = "identifier" > NV</ span >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
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Creates an < code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code >
given a sequence and a list of indicies.
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</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< code class = "computeroutput" >< span class = "identifier" > NV</ span >< span class = "special" > (</ span >< span class = "identifier" > nv1</ span >< span class = "special" > )</ span ></ code >
</ p >
</ td >
< td >
< p >
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Copy constructs an < code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code >
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from another < code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code > ,
< code class = "computeroutput" >< span class = "identifier" > nv1</ span ></ code > .
</ p >
</ td >
</ tr >
< tr >
< td >
< p >
< code class = "computeroutput" >< span class = "identifier" > nv1</ span > < span class = "special" > =</ span >
< span class = "identifier" > nv2</ span ></ code >
</ p >
</ td >
< td >
< p >
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Assigns to an < code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code > ,
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< code class = "computeroutput" >< span class = "identifier" > nv1</ span ></ code > , from another
< code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code > , < code class = "computeroutput" >< span class = "identifier" > nv2</ span ></ code > .
</ p >
</ td >
</ tr >
</ tbody >
</ table ></ div >
< p >
The < code class = "computeroutput" >< span class = "identifier" > nview</ span ></ code > internally stores
a Fusion < a class = "link" href = "../container/vector.html" title = "vector" >< code class = "computeroutput" >< span class = "identifier" > vector</ span ></ code ></ a >
of references to the elements of the original Fusion < a class = "link" href = "../sequence.html" title = "Sequence" > Sequence</ a >
</ p >
< a name = "fusion.view.nview.example" ></ a >< h5 >
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< a name = "id737802" ></ a >
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< a class = "link" href = "nview.html#fusion.view.nview.example" > Example</ a >
</ h5 >
< pre class = "programlisting" >< span class = "keyword" > typedef</ span > < a class = "link" href = "../container/vector.html" title = "vector" >< code class = "computeroutput" >< span class = "identifier" > vector</ span ></ code ></ a >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > ,</ span > < span class = "keyword" > char</ span >< span class = "special" > ,</ span > < span class = "keyword" > double</ span >< span class = "special" > > </ span > < span class = "identifier" > vec</ span >< span class = "special" > ;</ span >
< span class = "keyword" > typedef</ span > < span class = "identifier" > mpl</ span >< span class = "special" > ::</ span >< span class = "identifier" > vector_c</ span >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > ,</ span > < span class = "number" > 2</ span >< span class = "special" > ,</ span > < span class = "number" > 1</ span >< span class = "special" > ,</ span > < span class = "number" > 0</ span >< span class = "special" > ,</ span > < span class = "number" > 2</ span >< span class = "special" > ,</ span > < span class = "number" > 0</ span >< span class = "special" > > </ span > < span class = "identifier" > indicies</ span >< span class = "special" > ;</ span >
< span class = "identifier" > vec</ span > < span class = "identifier" > v1</ span >< span class = "special" > (</ span >< span class = "number" > 1</ span >< span class = "special" > ,</ span > < span class = "char" > 'c'</ span >< span class = "special" > ,</ span > < span class = "number" > 2.0</ 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" > nview</ span >< span class = "special" > < </ span >< span class = "identifier" > vec</ span >< span class = "special" > ,</ span > < span class = "identifier" > indicies</ span >< span class = "special" > > (</ span >< span class = "identifier" > v1</ span >< span class = "special" > )</ span > < span class = "special" > << </ span > < span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > endl</ span >< span class = "special" > ;</ span > < span class = "comment" > // (2.0 c 1 2.0 1)
</ span >< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > cout</ span > < span class = "special" > << </ span > < span class = "identifier" > as_nview</ span >< span class = "special" > < </ span >< span class = "number" > 2</ span >< span class = "special" > ,</ span > < span class = "number" > 1</ span >< span class = "special" > ,</ span > < span class = "number" > 1</ span >< span class = "special" > ,</ span > < span class = "number" > 0</ span >< span class = "special" > > (</ span >< span class = "identifier" > v1</ span >< span class = "special" > )</ span > < span class = "special" > << </ span > < span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > endl</ span >< span class = "special" > ;</ span > < span class = "comment" > // (2.0 c c 1)
</ 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
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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 > )
</ p >
</ div ></ td >
</ tr ></ table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "reverse_view.html" >< img src = "../../../../../../doc/html/images/prev.png" alt = "Prev" ></ a >< a accesskey = "u" href = "../view.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 = "../adapted.html" >< img src = "../../../../../../doc/html/images/next.png" alt = "Next" ></ a >
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