<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>unfused</title> <link rel="stylesheet" href="../../../../../../../doc/html/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.1"> <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_function_object.html" title="fused_function_object"> <link rel="next" href="unfused_typed.html" title="unfused_typed"> </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="../../../../../../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_function_object.html"><img src="../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../adapters.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="unfused_typed.html"><img src="../../../../../../../doc/html/images/next.png" alt="Next"></a> </div> <div class="section" title="unfused"> <div class="titlepage"><div><div><h4 class="title"> <a name="fusion.functional.adapters.unfused"></a><a class="link" href="unfused.html" title="unfused">unfused</a> </h4></div></div></div> <a name="fusion.functional.adapters.unfused.description"></a><h6> <a name="id831491"></a> <a class="link" href="unfused.html#fusion.functional.adapters.unfused.description">Description</a> </h6> <p> An n-ary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> adapter template for an unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> target function. When called, its arguments are bundled to a <a class="link" href="../../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random Access Sequence</a> of references that is passed to the target function object. </p> <p> The nullary overload of the call operator can be removed by setting the second template parameter to <code class="computeroutput"><span class="keyword">false</span></code>, which is very useful if the result type computation would result in a compile error, otherwise (nullary call operator's prototypes can't be templates and thus are instantiated as early as the class template). </p> <p> Only LValue arguments are accepted. To overcome this limitation, apply <a href="http://www.boost.org/libs/functional/forward/doc/html/index.html" target="_top">Boost.Functional/Forward</a>. </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 if the target function object is const - or, in case the target function object is held by value, the adapter is const. </p> <a name="fusion.functional.adapters.unfused.header"></a><h6> <a name="id831549"></a> <a class="link" href="unfused.html#fusion.functional.adapters.unfused.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">unfused</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <a name="fusion.functional.adapters.unfused.synopsis"></a><h6> <a name="id831619"></a> <a class="link" href="unfused.html#fusion.functional.adapters.unfused.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">bool</span> <span class="identifier">AllowNullary</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">></span> <span class="keyword">class</span> <span class="identifier">unfused</span><span class="special">;</span> </pre> <a name="fusion.functional.adapters.unfused.template_parameters"></a><h6> <a name="id831693"></a> <a class="link" href="unfused.html#fusion.functional.adapters.unfused.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 unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> </p> </td> <td> <p> </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">AllowNullary</span></code> </p> </td> <td> <p> Boolean constant </p> </td> <td> <p> true </p> </td> </tr> </tbody> </table></div> <a name="fusion.functional.adapters.unfused.model_of"></a><h6> <a name="id833727"></a> <a class="link" href="unfused.html#fusion.functional.adapters.unfused.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" title="Notation"> <p class="title"><b>Notation</b></p> <dl> <dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt> <dd><p> A possibly const qualified, unary <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">f</span></code></span></dt> <dd><p> An object convertible to <code class="computeroutput"><span class="identifier">F</span></code> </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">UL</span></code></span></dt> <dd><p> The type <code class="computeroutput"><span class="identifier">unfused</span><span class="special"><</span><span class="identifier">F</span><span class="special">></span></code> </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">ul</span></code></span></dt> <dd><p> An instance of <code class="computeroutput"><span class="identifier">UL</span></code>, initialized with <code class="computeroutput"><span class="identifier">f</span></code> </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code></span></dt> <dd><p> Arguments to <code class="computeroutput"><span class="identifier">ul</span></code> </p></dd> </dl> </div> <a name="fusion.functional.adapters.unfused.expression_semantics"></a><h6> <a name="id833917"></a> <a class="link" href="unfused.html#fusion.functional.adapters.unfused.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">UL</span><span class="special">(</span><span class="identifier">f</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">f</span></code>. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">UL</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">F</span></code>'s default constructor. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">ul</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code> </p> </td> <td> <p> Calls <code class="computeroutput"><span class="identifier">f</span></code> with a <a class="link" href="../../sequence.html" title="Sequence">Sequence</a> that contains references to the arguments <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code>. </p> </td> </tr> </tbody> </table></div> <a name="fusion.functional.adapters.unfused.example"></a><h6> <a name="id834110"></a> <a class="link" href="unfused.html#fusion.functional.adapters.unfused.example">Example</a> </h6> <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">fused_incrementer</span> <span class="special">{</span> <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Seq</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">result</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">void</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">class</span> <span class="identifier">Seq</span><span class="special">></span> <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Seq</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <a class="link" href="../../algorithm/iteration/functions/for_each.html" title="for_each"><code class="computeroutput"><span class="identifier">for_each</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,++</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">lambda</span><span class="special">::</span><span class="identifier">_1</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> <span class="identifier">unfused</span><span class="special"><</span><span class="identifier">fused_incrementer</span><span class="special">></span> <span class="identifier">increment</span><span class="special">;</span> <span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">2</span><span class="special">;</span> <span class="keyword">char</span> <span class="identifier">b</span> <span class="special">=</span> <span class="char">'X'</span><span class="special">;</span> <span class="identifier">increment</span><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">assert</span><span class="special">(</span><span class="identifier">a</span> <span class="special">==</span> <span class="number">3</span> <span class="special">&&</span> <span class="identifier">b</span> <span class="special">==</span> <span class="char">'Y'</span><span class="special">);</span> <span class="special">}</span> </pre> <a name="fusion.functional.adapters.unfused.see_also"></a><h6> <a name="id834477"></a> <a class="link" href="unfused.html#fusion.functional.adapters.unfused.see_also">See also</a> </h6> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"><a class="link" href="unfused_typed.html" title="unfused_typed"><code class="computeroutput"><span class="identifier">unfused_typed</span></code></a></li> <li class="listitem"><a class="link" href="../generation/functions/mk_unfused.html" title="make_unfused"><code class="computeroutput"><span class="identifier">make_unfused</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_function_object.html"><img src="../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../adapters.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="unfused_typed.html"><img src="../../../../../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>