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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h4 class="title"> | |
| 27 | <a name="phoenix.modules.scope.local_variables"></a><a class="link" href="local_variables.html" title="Local Variables">Local Variables</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">scope</span><span class="special">/</span><span class="identifier">local_variable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
| 30 | </pre> | |
| 31 | <p> | |
| 32 | We use an instance of: | |
| 33 | </p> | |
| 34 | <pre class="programlisting"><span class="identifier">expression</span><span class="special">::</span><span class="identifier">local_variable</span><span class="special"><</span><span class="identifier">Key</span><span class="special">>::</span><span class="identifier">type</span> | |
| 35 | </pre> | |
| 36 | <p> | |
| 37 | to represent a local variable. The local variable acts as an imaginary | |
| 38 | data-bin where a local, stack based data will be placed. <code class="computeroutput"><span class="identifier">Key</span></code> is an arbitrary type that is used | |
| 39 | to identify the local variable. Example: | |
| 40 | </p> | |
| 41 | <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">size_key</span><span class="special">;</span> | |
| 42 | <span class="identifier">expression</span><span class="special">::</span><span class="identifier">local_variable</span><span class="special"><</span><span class="identifier">size_key</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">size</span><span class="special">;</span> | |
| 43 | </pre> | |
| 44 | <p> | |
| 45 | <span class="bold"><strong>Predefined Local Variables</strong></span> | |
| 46 | </p> | |
| 47 | <p> | |
| 48 | There are a few predefined instances of <code class="computeroutput"><span class="identifier">expression</span><span class="special">::</span><span class="identifier">local_variable</span><span class="special"><</span><span class="identifier">Key</span><span class="special">>::</span><span class="identifier">type</span></code> | |
| 49 | named <code class="computeroutput"><span class="identifier">_a</span></code>..<code class="computeroutput"><span class="identifier">_z</span></code> that you can already use. To make | |
| 50 | use of them, simply use the <code class="computeroutput"><span class="keyword">namespace</span> | |
| 51 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">local_names</span></code>: | |
| 52 | </p> | |
| 53 | <pre class="programlisting"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">local_names</span><span class="special">;</span> | |
| 54 | </pre> | |
| 55 | </div> | |
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| 58 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
| 59 | Heller, John Fletcher<p> | |
| 60 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 61 | 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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