| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>transform_view</title> |
| <link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> |
| <link rel="home" href="../../index.html" title="Chapter 1. Fusion 2.0"> |
| <link rel="up" href="../view.html" title="View"> |
| <link rel="prev" href="zip_view.html" title="zip_view"> |
| <link rel="next" href="reverse_view.html" title="reverse_view"> |
| </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> |
| <td align="center"><a href="../../../../../../index.html">Home</a></td> |
| <td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> |
| <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> |
| <td align="center"><a href="../../../../../../more/index.htm">More</a></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="zip_view.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../view.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="reverse_view.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="fusion.view.transform_view"></a><a class="link" href="transform_view.html" title="transform_view">transform_view</a> |
| </h3></div></div></div> |
| <p> |
| The unary version of <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| presents a view of its underlying sequence given a unary function object |
| or function pointer. The binary version of <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| presents a view of 2 underlying sequences, given a binary function object |
| or function pointer. The <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| inherits the traversal characteristics (see <a class="link" 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><h5> |
| <a name="id954473"></a> |
| <a class="link" href="transform_view.html#fusion.view.transform_view.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">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><h5> |
| <a name="id954581"></a> |
| <a class="link" href="transform_view.html#fusion.view.transform_view.synopsis">Synopsis</a> |
| </h5> |
| <p> |
| <span class="bold"><strong>Unary Version</strong></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"><strong>Binary Version</strong></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><h5> |
| <a name="id954727"></a> |
| <a class="link" href="transform_view.html#fusion.view.transform_view.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> |
| A <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">Sequence1</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A <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">Sequence2</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A <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">F1</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A unary function object or function pointer. <code class="computeroutput"><a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></code></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></code> is the return type of an |
| instance of <code class="computeroutput"><span class="identifier">F1</span></code> |
| when called with a value of each element type <code class="computeroutput"><span class="identifier">E</span></code> |
| in the input sequence. |
| </p> |
| </td> |
| <td> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">F2</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A binary function object or function pointer. <code class="computeroutput"><a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></code></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></code> is the return type of an |
| instance of <code class="computeroutput"><span class="identifier">F2</span></code> |
| when called with a value of each corresponding pair of element |
| type <code class="computeroutput"><span class="identifier">E1</span></code> and <code class="computeroutput"><span class="identifier">E2</span></code> in the input sequences. |
| </p> |
| </td> |
| <td> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="fusion.view.transform_view.model_of"></a><h5> |
| <a name="id955070"></a> |
| <a class="link" href="transform_view.html#fusion.view.transform_view.model_of">Model of</a> |
| </h5> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| <a class="link" href="../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward Sequence</a>, |
| <a class="link" href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional |
| Sequence</a> or <a class="link" href="../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random |
| Access Sequence</a> depending on the traversal characteristics (see |
| <a class="link" 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"><code class="computeroutput"><span class="identifier">TV</span></code></span></dt> |
| <dd><p> |
| A <code class="computeroutput"><span class="identifier">transform_view</span></code> type |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">BTV</span></code></span></dt> |
| <dd><p> |
| A binary <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| type |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">UTV</span></code></span></dt> |
| <dd><p> |
| A unary <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| type |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">f1</span></code></span></dt> |
| <dd><p> |
| An instance of <code class="computeroutput"><span class="identifier">F1</span></code> |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">f2</span></code></span></dt> |
| <dd><p> |
| An instance of <code class="computeroutput"><span class="identifier">F2</span></code> |
| </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">Sequence</span></code> |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">s1</span></code></span></dt> |
| <dd><p> |
| An instance of <code class="computeroutput"><span class="identifier">Sequence1</span></code> |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">s2</span></code></span></dt> |
| <dd><p> |
| An instance of <code class="computeroutput"><span class="identifier">Sequence2</span></code> |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">tv</span></code>, <code class="computeroutput"><span class="identifier">tv2</span></code></span></dt> |
| <dd><p> |
| Instances of <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| </p></dd> |
| </dl> |
| </div> |
| <a name="fusion.view.transform_view.expression_semantics"></a><h5> |
| <a name="id955367"></a> |
| <a class="link" href="transform_view.html#fusion.view.transform_view.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/forward_sequence.html" title="Forward Sequence">Forward |
| Sequence</a>, <a class="link" href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional |
| Sequence</a> or <a class="link" href="../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random |
| Access Sequence</a> depending on the traversal characteristics (see <a class="link" 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> |
| <code 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></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Creates a unary <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| given sequence, <code class="computeroutput"><span class="identifier">s</span></code> |
| and unary function object or function pointer, <code class="computeroutput"><span class="identifier">f1</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code 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></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Creates a binary <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| given sequences, <code class="computeroutput"><span class="identifier">s1</span></code> |
| and <code class="computeroutput"><span class="identifier">s2</span></code> and binary |
| function object or function pointer, <code class="computeroutput"><span class="identifier">f2</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">TV</span><span class="special">(</span><span class="identifier">tv</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Copy constructs a <code class="computeroutput"><span class="identifier">transform_view</span></code> |
| from another <code class="computeroutput"><span class="identifier">transform_view</span></code>, |
| <code class="computeroutput"><span class="identifier">tv</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">tv</span> <span class="special">=</span> |
| <span class="identifier">tv2</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Assigns to a <code class="computeroutput"><span class="identifier">transform_view</span></code>, |
| <code class="computeroutput"><span class="identifier">tv</span></code>, from another |
| <code class="computeroutput"><span class="identifier">transform_view</span></code>, |
| <code class="computeroutput"><span class="identifier">tv2</span></code>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="fusion.view.transform_view.example"></a><h5> |
| <a name="id956869"></a> |
| <a class="link" href="transform_view.html#fusion.view.transform_view.example">Example</a> |
| </h5> |
| <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 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">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> |
| <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"> |
| <a accesskey="p" href="zip_view.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../view.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="reverse_view.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |