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  48 <a href="#pub-types">Public Types</a> &#124;
  49 <a href="#pub-static-methods">Static Public Member Functions</a> &#124;
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  51   <div class="headertitle">
  52 <div class="title">sigc::deduce_result_type&lt; T_functor, T_args &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group__adaptors.html">Adaptors</a></div></div>  </div>
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  54 <div class="contents">
  55
  56 <p>Deduce the return type of a functor.
  57  <a href="structsigc_1_1deduce__result__type.html#details">More...</a></p>
  58
  59 <p><code>#include &lt;sigc++/adaptors/deduce_result_type.h&gt;</code></p>
  60 <table class="memberdecls">
  61 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
  62 Public Types</h2></td></tr>
  63 <tr class="memitem:a529a6b7809ea3ad1a2d4392b9ffcec42"><td class="memItemLeft" align="right" valign="top">using&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structsigc_1_1deduce__result__type.html#a529a6b7809ea3ad1a2d4392b9ffcec42">type</a> = decltype(<a class="el" href="structsigc_1_1deduce__result__type.html#a46816d343f0924170208d220b7e599f4">test</a>&lt; T_functor &gt;())</td></tr>
  64 <tr class="separator:a529a6b7809ea3ad1a2d4392b9ffcec42"><td class="memSeparator" colspan="2">&#160;</td></tr>
  65 </table><table class="memberdecls">
  66 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
  67 Static Public Member Functions</h2></td></tr>
  68 <tr class="memitem:a46816d343f0924170208d220b7e599f4"><td class="memTemplParams" colspan="2">template&lt;class U_functor , typename  = typename std::is_base_of&lt;adaptor_base, T_functor&gt;::type&gt; </td></tr>
  69 <tr class="memitem:a46816d343f0924170208d220b7e599f4"><td class="memTemplItemLeft" align="right" valign="top">static U_functor::template <a class="el" href="structsigc_1_1deduce__result__type.html">deduce_result_type</a>&lt; T_args... &gt;::<a class="el" href="structsigc_1_1deduce__result__type.html#a529a6b7809ea3ad1a2d4392b9ffcec42">type</a>&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structsigc_1_1deduce__result__type.html#a46816d343f0924170208d220b7e599f4">test</a> ()</td></tr>
  70 <tr class="separator:a46816d343f0924170208d220b7e599f4"><td class="memSeparator" colspan="2">&#160;</td></tr>
  71 <tr class="memitem:ab9356fdb52cf08ca8eded48bae5e5bdb"><td class="memTemplParams" colspan="2">template&lt;class U_functor &gt; </td></tr>
  72 <tr class="memitem:ab9356fdb52cf08ca8eded48bae5e5bdb"><td class="memTemplItemLeft" align="right" valign="top">static <a class="el" href="structsigc_1_1functor__trait.html">functor_trait</a>&lt; T_functor &gt;::result_type&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structsigc_1_1deduce__result__type.html#ab9356fdb52cf08ca8eded48bae5e5bdb">test</a> ()</td></tr>
  73 <tr class="separator:ab9356fdb52cf08ca8eded48bae5e5bdb"><td class="memSeparator" colspan="2">&#160;</td></tr>
  74 </table>
  75 <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
  76 <div class="textblock"><h3>template&lt;class T_functor, class... T_args&gt;<br />
  77 struct sigc::deduce_result_type&lt; T_functor, T_args &gt;</h3>
  78
  79 <p>Deduce the return type of a functor. </p>
  80 <p><code>typename <a class="el" href="structsigc_1_1deduce__result__type.html#a529a6b7809ea3ad1a2d4392b9ffcec42">deduce_result_type&lt;functor_type, list of arg_types&gt;::type</a></code> deduces a functor's result type if <code>functor_type</code> inherits from <a class="el" href="structsigc_1_1functor__base.html" title="A hint to the compiler.">sigc::functor_base</a> and defines <code>result_type</code> or if <code>functor_type</code> is actually a (member) function type. Multi-type functors are not supported.</p>
  81 <p>sigc++ adaptors use <code>typename <a class="el" href="structsigc_1_1deduce__result__type.html#a529a6b7809ea3ad1a2d4392b9ffcec42">deduce_result_type&lt;functor_type, list of arg_types&gt;::type</a></code> to determine the return type of their <code>templated operator()</code> overloads.</p>
  82 <p>Adaptors in turn define a nested template class <code><a class="el" href="structsigc_1_1deduce__result__type.html" title="Deduce the return type of a functor.">deduce_result_type</a></code> that is used by template specializations of the global <a class="el" href="structsigc_1_1deduce__result__type.html" title="Deduce the return type of a functor.">deduce_result_type</a> template to correctly deduce the return types of the adaptor's suitable <code>template operator()</code> overload. </p>
  83 </div><h2 class="groupheader">Member Typedef Documentation</h2>
  84 <a id="a529a6b7809ea3ad1a2d4392b9ffcec42"></a>
  85 <h2 class="memtitle"><span class="permalink"><a href="#a529a6b7809ea3ad1a2d4392b9ffcec42">&#9670;&#160;</a></span>type</h2>
  86
  87 <div class="memitem">
  88 <div class="memproto">
  89 <div class="memtemplate">
  90 template &lt;class T_functor , class... T_args&gt; </div>
  91       <table class="memname">
  92         <tr>
  93           <td class="memname">using <a class="el" href="structsigc_1_1deduce__result__type.html">sigc::deduce_result_type</a>&lt; T_functor, T_args &gt;::<a class="el" href="structsigc_1_1deduce__result__type.html#a529a6b7809ea3ad1a2d4392b9ffcec42">type</a> =  decltype (<a class="el" href="structsigc_1_1deduce__result__type.html#a46816d343f0924170208d220b7e599f4">test</a>&lt;T_functor&gt; ())</td>
  94         </tr>
  95       </table>
  96 </div><div class="memdoc">
  97
  98 </div>
  99 </div>
 100 <h2 class="groupheader">Member Function Documentation</h2>
 101 <a id="a46816d343f0924170208d220b7e599f4"></a>
 102 <h2 class="memtitle"><span class="permalink"><a href="#a46816d343f0924170208d220b7e599f4">&#9670;&#160;</a></span>test() <span class="overload">[1/2]</span></h2>
 103
 104 <div class="memitem">
 105 <div class="memproto">
 106 <div class="memtemplate">
 107 template &lt;class T_functor , class... T_args&gt; </div>
 108 <div class="memtemplate">
 109 template &lt;class U_functor , typename  = typename std::is_base_of&lt;adaptor_base, T_functor&gt;::type&gt; </div>
 110 <table class="mlabels">
 111   <tr>
 112   <td class="mlabels-left">
 113       <table class="memname">
 114         <tr>
 115           <td class="memname">static U_functor::template <a class="el" href="structsigc_1_1deduce__result__type.html">deduce_result_type</a>&lt;T_args...&gt;::<a class="el" href="structsigc_1_1deduce__result__type.html#a529a6b7809ea3ad1a2d4392b9ffcec42">type</a> <a class="el" href="structsigc_1_1deduce__result__type.html">sigc::deduce_result_type</a>&lt; T_functor, T_args &gt;::test </td>
 116           <td>(</td>
 117           <td class="paramname"></td><td>)</td>
 118           <td></td>
 119         </tr>
 120       </table>
 121   </td>
 122   <td class="mlabels-right">
 123 <span class="mlabels"><span class="mlabel">static</span></span>  </td>
 124   </tr>
 125 </table>
 126 </div><div class="memdoc">
 127
 128 </div>
 129 </div>
 130 <a id="ab9356fdb52cf08ca8eded48bae5e5bdb"></a>
 131 <h2 class="memtitle"><span class="permalink"><a href="#ab9356fdb52cf08ca8eded48bae5e5bdb">&#9670;&#160;</a></span>test() <span class="overload">[2/2]</span></h2>
 132
 133 <div class="memitem">
 134 <div class="memproto">
 135 <div class="memtemplate">
 136 template &lt;class T_functor , class... T_args&gt; </div>
 137 <div class="memtemplate">
 138 template &lt;class U_functor &gt; </div>
 139 <table class="mlabels">
 140   <tr>
 141   <td class="mlabels-left">
 142       <table class="memname">
 143         <tr>
 144           <td class="memname">static <a class="el" href="structsigc_1_1functor__trait.html">functor_trait</a>&lt;T_functor&gt;::result_type <a class="el" href="structsigc_1_1deduce__result__type.html">sigc::deduce_result_type</a>&lt; T_functor, T_args &gt;::test </td>
 145           <td>(</td>
 146           <td class="paramname"></td><td>)</td>
 147           <td></td>
 148         </tr>
 149       </table>
 150   </td>
 151   <td class="mlabels-right">
 152 <span class="mlabels"><span class="mlabel">static</span></span>  </td>
 153   </tr>
 154 </table>
 155 </div><div class="memdoc">
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