<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>fused_function_object</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="../adapters.html" title="Adapters"> <link rel="prev" href="fused_procedure.html" title="fused_procedure"> <link rel="next" href="unfused.html" title="unfused"> </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="fused_procedure.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../adapters.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="unfused.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h4 class="title"> <a name="fusion.functional.adapters.fused_function_object"></a><a class="link" href="fused_function_object.html" title="fused_function_object">fused_function_object</a> </h4></div></div></div> <a name="fusion.functional.adapters.fused_function_object.description"></a><h6> <a name="id1114994"></a> <a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.description">Description</a> </h6> <p> An unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> adapter template for a <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> target function. It takes a <a class="link" href="../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward Sequence</a> that contains the arguments for the target function. </p> <p> The type of the target function is allowed to be const qualified or a reference. Const qualification is preserved and propagated appropriately (in other words, only const versions of <code class="literal">operator()</code> can be used for an target function object that is const or, if the target function object is held by value, the adapter is const). </p> <a name="fusion.functional.adapters.fused_function_object.header"></a><h6> <a name="id1115037"></a> <a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.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">functional</span><span class="special">/</span><span class="identifier">adapter</span><span class="special">/</span><span class="identifier">fused_function_object</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <a name="fusion.functional.adapters.fused_function_object.synopsis"></a><h6> <a name="id1115109"></a> <a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.synopsis">Synopsis</a> </h6> <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Function</span><span class="special">></span> <span class="keyword">class</span> <span class="identifier">fused_function_object</span><span class="special">;</span> </pre> <a name="fusion.functional.adapters.fused_function_object.template_parameters"></a><h6> <a name="id1115163"></a> <a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.template_parameters">Template parameters</a> </h6> <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">Function</span></code> </p> </td> <td> <p> <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> type </p> </td> <td> </td> </tr></tbody> </table></div> <a name="fusion.functional.adapters.fused_function_object.model_of"></a><h6> <a name="id1115254"></a> <a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.model_of">Model of</a> </h6> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> </li> <li class="listitem"> <a class="link" href="../concepts/def_callable.html" title="Deferred Callable Object">Deferred Callable Object</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">R</span></code></span></dt> <dd><p> A possibly const qualified <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> type or reference type thereof </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">r</span></code></span></dt> <dd><p> An object convertible to <code class="computeroutput"><span class="identifier">R</span></code> </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt> <dd><p> A <a class="link" href="../../sequence.html" title="Sequence">Sequence</a> of arguments that are accepted by <code class="computeroutput"><span class="identifier">r</span></code> </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt> <dd><p> An instance of <code class="computeroutput"><span class="identifier">fused</span><span class="special"><</span><span class="identifier">R</span><span class="special">></span></code> </p></dd> </dl> </div> <a name="fusion.functional.adapters.fused_function_object.expression_semantics"></a><h6> <a name="id1115423"></a> <a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.expression_semantics">Expression Semantics</a> </h6> <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">fused_function_object</span><span class="special"><</span><span class="identifier">R</span><span class="special">>(</span><span class="identifier">r</span><span class="special">)</span></code> </p> </td> <td> <p> Creates a fused function as described above, initializes the target function with <code class="computeroutput"><span class="identifier">r</span></code>. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">R</span><span class="special">>()</span></code> </p> </td> <td> <p> Creates a fused function as described above, attempts to use <code class="computeroutput"><span class="identifier">R</span></code>'s default constructor. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code> </p> </td> <td> <p> Calls <code class="computeroutput"><span class="identifier">r</span></code> with the elements in <code class="computeroutput"><span class="identifier">s</span></code> as its arguments. </p> </td> </tr> </tbody> </table></div> <a name="fusion.functional.adapters.fused_function_object.example"></a><h6> <a name="id1115619"></a> <a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.example">Example</a> </h6> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">SeqOfSeqs</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Func</span><span class="special">></span> <span class="keyword">typename</span> <a class="link" href="../../algorithm/transformation/metafunctions/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">zip_view</span><span class="special"><</span><span class="identifier">SeqOfSeqs</span><span class="special">></span> <span class="keyword">const</span><span class="special">,</span> <span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&></span> <span class="special">>::</span><span class="identifier">type</span> <span class="identifier">n_ary_transform</span><span class="special">(</span><span class="identifier">SeqOfSeqs</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">f</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <a class="link" href="../../algorithm/transformation/functions/transform.html" title="transform"><code class="computeroutput"><span class="identifier">transform</span></code></a><span class="special">(</span><span class="identifier">zip_view</span><span class="special"><</span><span class="identifier">SeqOfSeqs</span><span class="special">>(</span><span class="identifier">s</span><span class="special">),</span> <span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&>(</span><span class="identifier">f</span><span class="special">));</span> <span class="special">}</span> <span class="keyword">struct</span> <span class="identifier">sub</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">class</span> <span class="identifier">Self</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">result</span><span class="special"><</span> <span class="identifier">Self</span><span class="special">(</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">T</span><span class="special">)</span> <span class="special">></span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">type</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">lhs</span><span class="special">,</span> <span class="identifier">T</span> <span class="identifier">rhs</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">lhs</span> <span class="special">-</span> <span class="identifier">rhs</span><span class="special">;</span> <span class="special">}</span> <span class="special">};</span> <span class="keyword">void</span> <span class="identifier">try_it</span><span class="special">()</span> <span class="special">{</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">float</span><span class="special">></span> <span class="identifier">a</span><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">2.0f</span><span class="special">);</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">float</span><span class="special">></span> <span class="identifier">b</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">1.5f</span><span class="special">);</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">float</span><span class="special">></span> <span class="identifier">c</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">0.5f</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">c</span> <span class="special">==</span> <span class="identifier">n_ary_transform</span><span class="special">(</span><a class="link" href="../../container/generation/functions/vector_tie.html" title="vector_tie"><code class="computeroutput"><span class="identifier">vector_tie</span></code></a><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">),</span> <span class="identifier">sub</span><span class="special">()));</span> <span class="special">}</span> </pre> <a name="fusion.functional.adapters.fused_function_object.see_also"></a><h6> <a name="id1116390"></a> <a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.see_also">See also</a> </h6> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <a class="link" href="fused.html" title="fused"><code class="computeroutput"><span class="identifier">fused</span></code></a> </li> <li class="listitem"> <a class="link" href="fused_procedure.html" title="fused_procedure"><code class="computeroutput"><span class="identifier">fused_procedure</span></code></a> </li> <li class="listitem"> <a class="link" href="../invocation/functions/invoke_fobj.html" title="invoke_function_object"><code class="computeroutput"><span class="identifier">invoke_function_object</span></code></a> </li> <li class="listitem"> <a class="link" href="../generation/functions/mk_fused_fobj.html" title="make_fused_function_object"><code class="computeroutput"><span class="identifier">make_fused_function_object</span></code></a> </li> <li class="listitem"> <a class="link" href="../../support/deduce.html" title="deduce"><code class="computeroutput"><span class="identifier">deduce</span></code></a> </li> </ul></div> </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="fused_procedure.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../adapters.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="unfused.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>