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25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h4 class="title"> | |
27 | <a name="phoenix.modules.core.nothing"></a><a class="link" href="nothing.html" title="Nothing">Nothing</a> | |
28 | </h4></div></div></div> | |
29 | <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> | |
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"><</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> | |
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"><</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". | |
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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41 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
42 | Heller, John Fletcher<p> | |
43 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
44 | 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>) | |
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