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| <div class="section"> |
| <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> |
| <a name="id958130"></a> |
| <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 |
| a specified order. An <code class="computeroutput"><span class="identifier">nview</span></code> |
| 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> |
| <a name="id958171"></a> |
| <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> |
| <a name="id958279"></a> |
| <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> |
| <a name="id958486"></a> |
| <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> |
| </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> |
| </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> |
| <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>... |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="fusion.view.nview.model_of"></a><h5> |
| <a name="id958702"></a> |
| <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"> |
| <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> |
| <a name="id958830"></a> |
| <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> |
| Creates an <code class="computeroutput"><span class="identifier">nview</span></code> |
| given a sequence and a list of indicies. |
| </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> |
| Copy constructs an <code class="computeroutput"><span class="identifier">nview</span></code> |
| 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> |
| Assigns to an <code class="computeroutput"><span class="identifier">nview</span></code>, |
| <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> |
| <a name="id960852"></a> |
| <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> |
| <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> |
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