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29<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">nothing</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
30</pre>
31<p>
32          Finally, the <code class="computeroutput"><span class="identifier">expression</span><span class="special">::</span><span class="identifier">null</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">void_</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
33          does nothing; (a "bum", if you will :-) ). There's a sole <code class="computeroutput"><span class="identifier">expression</span><span class="special">::</span><span class="identifier">null</span><span class="special">&lt;</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">void_</span><span class="special">&gt;::</span><span class="identifier">type</span></code> instance named "nothing".
34          This actor is actually useful in situations where we don't want to do anything.
35          (See <a class="link" href="../statement/for_statement.html" title="for_ Statement">for_ Statement</a>
36          for example).
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42        Distributed under the Boost Software License, Version 1.0. (See accompanying
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