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| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="fusion.algorithm.transformation.metafunctions.transform"></a><a class="link" href="transform.html" title="transform">transform</a> |
| </h5></div></div></div> |
| <a name="fusion.algorithm.transformation.metafunctions.transform.description"></a><h6> |
| <a name="id1038889"></a> |
| <a class="link" href="transform.html#fusion.algorithm.transformation.metafunctions.transform.description">Description</a> |
| </h6> |
| <p> |
| For a sequence <code class="computeroutput"><span class="identifier">seq</span></code> and |
| function object or function pointer <code class="computeroutput"><span class="identifier">f</span></code>, |
| <code class="computeroutput"><span class="identifier">transform</span></code> returns a new |
| sequence with elements created by applying <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></code> to each element of <code class="computeroutput"><span class="identifier">e</span></code> |
| of <code class="computeroutput"><span class="identifier">seq</span></code>. |
| </p> |
| <a name="fusion.algorithm.transformation.metafunctions.transform.unary_version_synopsis"></a><h6> |
| <a name="id1038960"></a> |
| <a class="link" href="transform.html#fusion.algorithm.transformation.metafunctions.transform.unary_version_synopsis">Unary |
| version synopsis</a> |
| </h6> |
| <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">F</span> |
| <span class="special">></span> |
| <span class="keyword">typename</span> <a class="link" href="transform.html" title="transform"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">transform</span></code></a><span class="special"><</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">F</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">transform</span><span class="special">(</span> |
| <span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span> |
| </pre> |
| <div class="table"> |
| <a name="id1039101"></a><p class="title"><b>Table 1.85. Parameters</b></p> |
| <div class="table-contents"><table class="table" summary="Parameters"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Requirement |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">seq</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward |
| Sequence</a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Operation's argument |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">f</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></code> |
| is a valid expression for each element <code class="computeroutput"><span class="identifier">e</span></code> |
| of <code class="computeroutput"><span class="identifier">seq</span></code>. <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">F</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 <code class="computeroutput"><span class="identifier">f</span></code> |
| when called with a value of each element type <code class="computeroutput"><span class="identifier">E</span></code>. |
| </p> |
| </td> |
| <td> |
| <p> |
| Transformation function |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <br class="table-break"><a name="fusion.algorithm.transformation.metafunctions.transform.expression_semantics"></a><h6> |
| <a name="id1039309"></a> |
| <a class="link" href="transform.html#fusion.algorithm.transformation.metafunctions.transform.expression_semantics">Expression |
| Semantics</a> |
| </h6> |
| <pre class="programlisting"><a class="link" href="../functions/transform.html" title="transform"><code class="computeroutput"><span class="identifier">transform</span></code></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span> |
| </pre> |
| <p> |
| <span class="bold"><strong>Return type</strong></span>: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward |
| Sequence</a> |
| </li> |
| <li class="listitem"> |
| A model of <a class="link" href="../../../sequence/concepts/associative_sequence.html" title="Associative Sequence">Associative |
| Sequence</a> if <code class="computeroutput"><span class="identifier">Sequence</span></code> |
| implements the <a class="link" href="../../../sequence/concepts/associative_sequence.html" title="Associative Sequence">Associative |
| Sequence</a> model. |
| </li> |
| </ul></div> |
| <p> |
| <span class="bold"><strong>Semantics</strong></span>: Returns a new sequence, containing |
| the return values of <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></code> for each element <code class="computeroutput"><span class="identifier">e</span></code> |
| within <code class="computeroutput"><span class="identifier">seq</span></code>. |
| </p> |
| <a name="fusion.algorithm.transformation.metafunctions.transform.binary_version_synopsis"></a><h6> |
| <a name="id1039443"></a> |
| <a class="link" href="transform.html#fusion.algorithm.transformation.metafunctions.transform.binary_version_synopsis">Binary |
| version synopsis</a> |
| </h6> |
| <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">F</span> |
| <span class="special">></span> |
| <span class="keyword">typename</span> <a class="link" href="transform.html" title="transform"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">transform</span></code></a><span class="special"><</span><span class="identifier">Sequence1</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">Sequence2</span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">F</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">transform</span><span class="special">(</span> |
| <span class="identifier">Sequence1</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">seq1</span><span class="special">,</span> <span class="identifier">Sequence2</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">seq2</span><span class="special">,</span> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span> |
| </pre> |
| <div class="table"> |
| <a name="id1039633"></a><p class="title"><b>Table 1.86. Parameters</b></p> |
| <div class="table-contents"><table class="table" summary="Parameters"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Requirement |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">seq1</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward |
| Sequence</a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Operation's argument |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">seq2</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward |
| Sequence</a> |
| </p> |
| </td> |
| <td> |
| <p> |
| Operation's argument |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">f</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">e2</span><span class="special">)</span></code> |
| is a valid expression for each pair of elements <code class="computeroutput"><span class="identifier">e1</span></code> of <code class="computeroutput"><span class="identifier">seq1</span></code> |
| and <code class="computeroutput"><span class="identifier">e2</span></code> of |
| <code class="computeroutput"><span class="identifier">seq2</span></code>. <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">F</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 <code class="computeroutput"><span class="identifier">f</span></code> |
| when called with elements of type <code class="computeroutput"><span class="identifier">E1</span></code> |
| and <code class="computeroutput"><span class="identifier">E2</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Transformation function |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <br class="table-break"><p> |
| <span class="bold"><strong>Return type</strong></span>: A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward |
| Sequence</a>. |
| </p> |
| <p> |
| <span class="bold"><strong>Semantics</strong></span>: Returns a new sequence, containing |
| the return values of <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span> <span class="identifier">e2</span><span class="special">)</span></code> for each pair of elements <code class="computeroutput"><span class="identifier">e1</span></code> and <code class="computeroutput"><span class="identifier">e2</span></code> |
| within <code class="computeroutput"><span class="identifier">seq1</span></code> and <code class="computeroutput"><span class="identifier">seq2</span></code> respectively. |
| </p> |
| <a name="fusion.algorithm.transformation.metafunctions.transform.complexity"></a><h6> |
| <a name="id1039990"></a> |
| <a class="link" href="transform.html#fusion.algorithm.transformation.metafunctions.transform.complexity">Complexity</a> |
| </h6> |
| <p> |
| Constant. Returns a view which is lazily evaluated. |
| </p> |
| <a name="fusion.algorithm.transformation.metafunctions.transform.header"></a><h6> |
| <a name="id1040010"></a> |
| <a class="link" href="transform.html#fusion.algorithm.transformation.metafunctions.transform.header">Header</a> |
| </h6> |
| <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">algorithm</span><span class="special">/</span><span class="identifier">transformation</span><span class="special">/</span><span class="identifier">transform</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</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <a name="fusion.algorithm.transformation.metafunctions.transform.example"></a><h6> |
| <a name="id1040130"></a> |
| <a class="link" href="transform.html#fusion.algorithm.transformation.metafunctions.transform.example">Example</a> |
| </h6> |
| <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">triple</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">result_type</span><span class="special">;</span> |
| |
| <span class="keyword">int</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">int</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span> |
| <span class="special">{</span> |
| <span class="keyword">return</span> <span class="identifier">t</span> <span class="special">*</span> <span class="number">3</span><span class="special">;</span> |
| <span class="special">};</span> |
| <span class="special">};</span> |
| <span class="special">...</span> |
| <span class="identifier">assert</span><span class="special">(</span><a class="link" href="../functions/transform.html" title="transform"><code class="computeroutput"><span class="identifier">transform</span></code></a><span class="special">(</span><a class="link" href="../../../container/generation/functions/make_vector.html" title="make_vector"><code class="computeroutput"><span class="identifier">make_vector</span></code></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">),</span> <span class="identifier">triple</span><span class="special">())</span> <span class="special">==</span> <a class="link" href="../../../container/generation/functions/make_vector.html" title="make_vector"><code class="computeroutput"><span class="identifier">make_vector</span></code></a><span class="special">(</span><span class="number">3</span><span class="special">,</span><span class="number">6</span><span class="special">,</span><span class="number">9</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> |
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