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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | |
| 27 | <a name="phoenix.actor"></a><a class="link" href="actor.html" title="Actor">Actor</a> | |
| 28 | </h2></div></div></div> | |
| 29 | <p> | |
| 30 | The <code class="computeroutput"><span class="identifier">Actor</span></code> is the main concept | |
| 31 | behind the library. Actors are function objects. An actor can accept 0 to | |
| 32 | <code class="computeroutput"><span class="identifier">BOOST_PHOENIX_LIMIT</span></code> arguments. | |
| 33 | </p> | |
| 34 | <div class="note"><table border="0" summary="Note"> | |
| 35 | <tr> | |
| 36 | <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../doc/src/images/note.png"></td> | |
| 37 | <th align="left">Note</th> | |
| 38 | </tr> | |
| 39 | <tr><td align="left" valign="top"><p> | |
| 40 | You can set <code class="computeroutput"><span class="identifier">BOOST_PHOENIX_LIMIT</span></code>, | |
| 41 | the predefined maximum arity an actor can take. By default, <code class="computeroutput"><span class="identifier">BOOST_PHOENIX_LIMIT</span></code> is set to 10. | |
| 42 | </p></td></tr> | |
| 43 | </table></div> | |
| 44 | <p> | |
| 45 | Phoenix supplies an <code class="computeroutput"><span class="identifier">actor</span></code> class | |
| 46 | template whose specializations model the <code class="computeroutput"><span class="identifier">Actor</span></code> | |
| 47 | concept. <code class="computeroutput"><span class="identifier">actor</span></code> has one template | |
| 48 | parameter, <code class="computeroutput"><span class="identifier">Expr</span></code>, that supplies | |
| 49 | the underlying expression to evaluate. | |
| 50 | </p> | |
| 51 | <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">></span> | |
| 52 | <span class="keyword">struct</span> <span class="identifier">actor</span> | |
| 53 | <span class="special">{</span> | |
| 54 | <span class="identifier">return_type</span> | |
| 55 | <span class="keyword">operator</span><span class="special">()()</span> <span class="keyword">const</span><span class="special">;</span> | |
| 56 | ||
| 57 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T0</span><span class="special">></span> | |
| 58 | <span class="identifier">return_type</span> | |
| 59 | <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T0</span><span class="special">&</span> <span class="identifier">_0</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> | |
| 60 | ||
| 61 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">></span> | |
| 62 | <span class="identifier">return_type</span> | |
| 63 | <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T0</span><span class="special">&</span> <span class="identifier">_0</span><span class="special">,</span> <span class="identifier">T1</span><span class="special">&</span> <span class="identifier">_1</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> | |
| 64 | ||
| 65 | <span class="comment">//...</span> | |
| 66 | <span class="special">};</span> | |
| 67 | </pre> | |
| 68 | <p> | |
| 69 | The actor class accepts the arguments through a set of function call operators | |
| 70 | for 0 to <code class="computeroutput"><span class="identifier">BOOST_PHOENIX_LIMIT</span></code> | |
| 71 | arities (Don't worry about the details, for now. Note, for example, that we | |
| 72 | skimp over the details regarding <code class="computeroutput"><span class="identifier">return_type</span></code>). | |
| 73 | The arguments are passed through to the evaluation mechanism. For more information | |
| 74 | see <a class="link" href="inside/actor.html" title="Actors in Detail">Inside Actors</a>. | |
| 75 | </p> | |
| 76 | </div> | |
| 77 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 78 | <td align="left"></td> | |
| 79 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
| 80 | Heller, John Fletcher<p> | |
| 81 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 82 | 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>) | |
| 83 | </p> | |
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