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  55 <div class="title">sigc::functor_base Struct Reference<div class="ingroups"><a class="el" href="group__sigcfunctors.html">Functors</a></div></div>  </div>
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  58
  59 <p>A hint to the compiler.
  60  <a href="structsigc_1_1functor__base.html#details">More...</a></p>
  61
  62 <p><code>#include &lt;sigc++/functors/functor_base.h&gt;</code></p>
  63 <div class="dynheader">
  64 Inheritance diagram for sigc::functor_base:</div>
  65 <div class="dyncontent">
  66 <div class="center"><img src="structsigc_1_1functor__base__inherit__graph.png" border="0" usemap="#sigc_1_1functor__base_inherit__map" alt="Inheritance graph"/></div>
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  69 <center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
  70 <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
  71 <div class="textblock"><p>A hint to the compiler. </p>
  72 <p>All functors which define <code>result_type</code> should publically inherit from this hint. </p>
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