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  48 <div class="title">sigc::adaptor_base Struct Reference<div class="ingroups"><a class="el" href="group__adaptors.html">Adaptors</a></div></div>  </div>
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  51
  52 <p>A hint to the compiler.
  53  <a href="structsigc_1_1adaptor__base.html#details">More...</a></p>
  54
  55 <p><code>#include &lt;sigc++/adaptors/deduce_result_type.h&gt;</code></p>
  56 <div class="dynheader">
  57 Inheritance diagram for sigc::adaptor_base:</div>
  58 <div class="dyncontent">
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  86 <center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
  87 <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
  88 <div class="textblock"><p>A hint to the compiler. </p>
  89 <p>Functors which have all methods based on templates should publicly inherit from this hint and 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 can be used to deduce the methods' return types.</p>
  90 <p><a class="el" href="structsigc_1_1adaptor__base.html" title="A hint to the compiler.">adaptor_base</a> inherits from the <a class="el" href="structsigc_1_1functor__base.html" title="A hint to the compiler.">functor_base</a> hint so derived types should also have a result_type defined.</p>
  91 <p>Adaptors don't inherit from this type directly. They use use <a class="el" href="structsigc_1_1adapts.html" title="Base type for adaptors.">sigc::adapts</a> as a base type instead. sigc::adaptors wraps arbitrary functor types as well as function pointers and class methods. </p>
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