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  57   <div class="headertitle">
  58 <div class="title">sigc::functor_trait&lt; T_functor, I_derives_functor_base, I_can_use_decltype &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group__sigcfunctors.html">Functors</a></div></div>  </div>
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  61
  62 <p>Trait that specifies the return type of any type.
  63  <a href="structsigc_1_1functor__trait.html#details">More...</a></p>
  64
  65 <p><code>#include &lt;sigc++/functors/functor_trait.h&gt;</code></p>
  66 <table class="memberdecls">
  67 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
  68 Public Types</h2></td></tr>
  69 <tr class="memitem:aab859f8b89c8e68d53f05506970b217e"><td class="memItemLeft" align="right" valign="top">using&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1functor__trait.html#aab859f8b89c8e68d53f05506970b217e">functor_type</a> = T_functor</td></tr>
  70 <tr class="separator:aab859f8b89c8e68d53f05506970b217e"><td class="memSeparator" colspan="2">&#160;</td></tr>
  71 <tr class="memitem:a8fdb1c2faa79642fea821ab1052dfd40"><td class="memItemLeft" align="right" valign="top">using&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1functor__trait.html#a8fdb1c2faa79642fea821ab1052dfd40">result_type</a> = void</td></tr>
  72 <tr class="separator:a8fdb1c2faa79642fea821ab1052dfd40"><td class="memSeparator" colspan="2">&#160;</td></tr>
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  74 <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
  75 <div class="textblock"><h3>template&lt;class T_functor, bool I_derives_functor_base = std::is_base_of&lt;functor_base,T_functor&gt;::value, bool I_can_use_decltype = can_deduce_result_type_with_decltype&lt;T_functor&gt;::value&gt;<br />
  76 struct sigc::functor_trait&lt; T_functor, I_derives_functor_base, I_can_use_decltype &gt;</h3>
  77
  78 <p>Trait that specifies the return type of any type. </p>
  79 <p>Template specializations for functors derived from <a class="el" href="structsigc_1_1functor__base.html" title="A hint to the compiler. ">sigc::functor_base</a>, for other functors whose result type can be deduced with decltype(), for function pointers and for class methods are provided.</p>
  80 <dl class="tparams"><dt>Template Parameters</dt><dd>
  81   <table class="tparams">
  82     <tr><td class="paramname">T_functor</td><td>Functor type. </td></tr>
  83     <tr><td class="paramname">I_derives_functor_base</td><td>Whether <code>T_functor</code> inherits from <a class="el" href="structsigc_1_1functor__base.html" title="A hint to the compiler. ">sigc::functor_base</a>. </td></tr>
  84     <tr><td class="paramname">I_can_use_decltype</td><td>Whether the result type of <code>T_functor</code> can be deduced with decltype(). </td></tr>
  85   </table>
  86   </dd>
  87 </dl>
  88 </div><h2 class="groupheader">Member Typedef Documentation</h2>
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  92 <div class="memtemplate">
  93 template &lt;class T_functor, bool I_derives_functor_base = std::is_base_of&lt;functor_base,T_functor&gt;::value, bool I_can_use_decltype = can_deduce_result_type_with_decltype&lt;T_functor&gt;::value&gt; </div>
  94       <table class="memname">
  95         <tr>
  96           <td class="memname">using <a class="el" href="structsigc_1_1functor__trait.html">sigc::functor_trait</a>&lt; T_functor, I_derives_functor_base, I_can_use_decltype &gt;::<a class="el" href="structsigc_1_1functor__trait.html#aab859f8b89c8e68d53f05506970b217e">functor_type</a> =  T_functor</td>
  97         </tr>
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 106 <div class="memtemplate">
 107 template &lt;class T_functor, bool I_derives_functor_base = std::is_base_of&lt;functor_base,T_functor&gt;::value, bool I_can_use_decltype = can_deduce_result_type_with_decltype&lt;T_functor&gt;::value&gt; </div>
 108       <table class="memname">
 109         <tr>
 110           <td class="memname">using <a class="el" href="structsigc_1_1functor__trait.html">sigc::functor_trait</a>&lt; T_functor, I_derives_functor_base, I_can_use_decltype &gt;::<a class="el" href="structsigc_1_1functor__trait.html#a8fdb1c2faa79642fea821ab1052dfd40">result_type</a> =  void</td>
 111         </tr>
 112       </table>
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