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| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</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">></span> |
| </pre> |
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| Finally, the <code class="computeroutput"><span class="identifier">expression</span><span class="special">::</span><span class="identifier">null</span><span class="special"><</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">void_</span><span class="special">>::</span><span class="identifier">type</span></code> |
| 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"><</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">void_</span><span class="special">>::</span><span class="identifier">type</span></code> instance named "nothing". |
| This actor is actually useful in situations where we don't want to do anything. |
| (See <a class="link" href="../statement/for_statement.html" title="for_ Statement">for_ Statement</a> |
| for example). |
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