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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="spirit.qi.quick_reference.semantic_actions"></a><a class="link" href="semantic_actions.html" title="Parser Semantic Actions">Parser
  28         Semantic Actions</a>
  29 </h4></div></div></div>
  30 <p>
  31           Has the form:
  32         </p>
  33 <pre class="programlisting"><span class="identifier">p</span><span class="special">[</span><span class="identifier">f</span><span class="special">]</span>
  34 </pre>
  35 <p>
  36           where <code class="computeroutput"><span class="identifier">f</span></code> is a function with
  37           the signatures:
  38         </p>
  39 <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">Attrib</span> <span class="keyword">const</span><span class="special">&amp;);</span>
  40 <span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">Attrib</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;);</span>
  41 <span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">Attrib</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;,</span> <span class="keyword">bool</span><span class="special">&amp;);</span>
  42 </pre>
  43 <p>
  44           You can use <a href="../../../../../../../libs/bind/index.html" target="_top">Boost.Bind</a>
  45           to bind member functions. For function objects, the allowed signatures
  46           are:
  47         </p>
  48 <pre class="programlisting"><span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Attrib</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="identifier">unused_type</span><span class="special">,</span> <span class="identifier">unused_type</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  49 <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Attrib</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;,</span> <span class="identifier">unused_type</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  50 <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Attrib</span> <span class="keyword">const</span><span class="special">&amp;,</span> <span class="identifier">Context</span><span class="special">&amp;,</span> <span class="keyword">bool</span><span class="special">&amp;)</span> <span class="keyword">const</span><span class="special">;</span>
  51 </pre>
  52 <p>
  53           The <code class="computeroutput"><span class="identifier">unused_type</span></code> is used
  54           in the signatures above to signify 'don't care'.
  55         </p>
  56 <p>
  57           For more detailed information about semantic actions see: <a class="link" href="../tutorials/semantic_actions.html" title="Parser Semantic Actions">here</a>.
  58         </p>
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