ceph/src/boost/libs/phoenix/doc/html/phoenix/modules/core/nothing.html

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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).
  37         </p>
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