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<div class="title">zypp::functor::functor_detail Namespace Reference<div class="ingroups"><a class="el" href="group__g__Functor.html">Filters and Functors</a></div></div>  </div>
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<p>An unary functor forwarding to some other <code>TFunctor &amp;</code>.  
<a href="#details">More...</a></p>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structzypp_1_1functor_1_1functor__detail_1_1FunctorRef0.html">FunctorRef0</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structzypp_1_1functor_1_1functor__detail_1_1FunctorRef1.html">FunctorRef1</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structzypp_1_1functor_1_1functor__detail_1_1FunctorRef2.html">FunctorRef2</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structzypp_1_1functor_1_1functor__detail_1_1nil.html">nil</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>An unary functor forwarding to some other <code>TFunctor &amp;</code>. </p>
<p>Most algorithms take functor arguments by value. That's inconvenient if the functor wants to collect and return data. Creating and passing a <a class="el" href="structzypp_1_1functor_1_1FunctorRef.html">FunctorRef</a> to the algorithm, may help you out of this.</p>
<div class="fragment"><div class="line"><span class="comment">// Counts invokations of operator().</span></div><div class="line"><span class="keyword">template</span>&lt;<span class="keyword">class</span> Tp&gt;</div><div class="line">  <span class="keyword">struct </span>Counter : <span class="keyword">public</span> std::unary_function&lt;Tp, void&gt;</div><div class="line">  {</div><div class="line">    <span class="keywordtype">void</span> operator()( Tp )</div><div class="line">    { ++<a class="code" href="SysContent_8cc.html#a5566eab00fc081a74f536939218937ad">_value</a>; }</div><div class="line"></div><div class="line">    Counter() : <a class="code" href="SysContent_8cc.html#a5566eab00fc081a74f536939218937ad">_value</a>( 0 ) {}</div><div class="line"></div><div class="line">    <span class="keywordtype">unsigned</span> <a class="code" href="SysContent_8cc.html#a5566eab00fc081a74f536939218937ad">_value</a>;</div><div class="line">  };</div><div class="line"></div><div class="line">std::set&lt;SomeType&gt; c;</div><div class="line">Counter&lt;SomeType&gt; counter;</div><div class="line"><span class="comment">// Invokations of FunctorRef are forwarded to counter:</span></div><div class="line">std::for_each( c.begin, c.end(),</div><div class="line">               <span class="comment">// currently you must specify the</span></div><div class="line">               <span class="comment">// operator() signature:</span></div><div class="line">               functorRef&lt;void,SomeType&gt;(counter)</div><div class="line">             );</div></div><!-- fragment --><dl class="section note"><dt>Note</dt><dd><a class="el" href="structzypp_1_1functor_1_1FunctorRef.html" title="A binary FunctorRef.">FunctorRef</a> must be able to deduce the signature of <code>TFunctor::operator()</code>. This is currently not automated, so you must specify the operator() signature as template arguments.</dd>
<dd>
The order is &lt;result_type, arg1_type, ...&gt; (this differs from std::, where the result comes last).</dd></dl>
<dl class="todo"><dt><b><a class="el" href="todo.html#_todo000006">Todo:</a></b></dt><dd>drop it an use boost::ref </dd></dl>
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