1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Parser Semantic Actions</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Spirit 2.5.8"> 8<link rel="up" href="../quick_reference.html" title="Quick Reference"> 9<link rel="prev" href="non_terminals.html" title="Nonterminals"> 10<link rel="next" href="phoenix.html" title="Phoenix"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="non_terminals.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../quick_reference.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="phoenix.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 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">&);</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">&,</span> <span class="identifier">Context</span><span class="special">&);</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">&,</span> <span class="identifier">Context</span><span class="special">&,</span> <span class="keyword">bool</span><span class="special">&);</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">&,</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">&,</span> <span class="identifier">Context</span><span class="special">&,</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">&,</span> <span class="identifier">Context</span><span class="special">&,</span> <span class="keyword">bool</span><span class="special">&)</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> 59</div> 60<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 61<td align="left"></td> 62<td align="right"><div class="copyright-footer">Copyright © 2001-2011 Joel de Guzman, Hartmut Kaiser<p> 63 Distributed under the Boost Software License, Version 1.0. (See accompanying 64 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 65 </p> 66</div></td> 67</tr></table> 68<hr> 69<div class="spirit-nav"> 70<a accesskey="p" href="non_terminals.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../quick_reference.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="phoenix.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 71</div> 72</body> 73</html> 74
