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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h4 class="title"> | |
| 27 | <a name="phoenix.modules.bind.binding_member_variables"></a><a class="link" href="binding_member_variables.html" title="Binding Member Variables">Binding | |
| 28 | Member Variables</a> | |
| 29 | </h4></div></div></div> | |
| 30 | <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">bind</span><span class="special">/</span><span class="identifier">bind_member_variable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
| 31 | </pre> | |
| 32 | <p> | |
| 33 | Member variables can also be bound much like member functions. Member variables | |
| 34 | are not functions. Yet, like the <a class="link" href="../core/references.html" title="References"><code class="computeroutput"><span class="identifier">ref</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code></a> | |
| 35 | that acts like a nullary function returning a reference to the data, member | |
| 36 | variables, when bound, act like a unary function, taking in a pointer or | |
| 37 | reference to an object as its argument and returning a reference to the | |
| 38 | bound member variable. For instance, given: | |
| 39 | </p> | |
| 40 | <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xyz</span> | |
| 41 | <span class="special">{</span> | |
| 42 | <span class="keyword">int</span> <span class="identifier">v</span><span class="special">;</span> | |
| 43 | <span class="special">};</span> | |
| 44 | </pre> | |
| 45 | <p> | |
| 46 | <code class="computeroutput"><span class="identifier">xyz</span><span class="special">::</span><span class="identifier">v</span></code> can be bound as: | |
| 47 | </p> | |
| 48 | <pre class="programlisting"><span class="identifier">bind</span><span class="special">(&</span><span class="identifier">xyz</span><span class="special">::</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">obj</span><span class="special">)</span> <span class="comment">// obj is an xyz object</span> | |
| 49 | </pre> | |
| 50 | <p> | |
| 51 | As noted, just like the bound member function, a bound member variable | |
| 52 | also expects the first (and only) argument to be a pointer or reference | |
| 53 | to an object. The object (reference or pointer) can be lazily bound. Examples: | |
| 54 | </p> | |
| 55 | <pre class="programlisting"><span class="identifier">xyz</span> <span class="identifier">obj</span><span class="special">;</span> | |
| 56 | <span class="identifier">bind</span><span class="special">(&</span><span class="identifier">xyz</span><span class="special">::</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">arg1</span><span class="special">)</span> <span class="comment">// arg1.v</span> | |
| 57 | <span class="identifier">bind</span><span class="special">(&</span><span class="identifier">xyz</span><span class="special">::</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">obj</span><span class="special">)</span> <span class="comment">// obj.v</span> | |
| 58 | <span class="identifier">bind</span><span class="special">(&</span><span class="identifier">xyz</span><span class="special">::</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">arg1</span><span class="special">)(</span><span class="identifier">obj</span><span class="special">)</span> <span class="special">=</span> <span class="number">4</span> <span class="comment">// obj.v = 4</span> | |
| 59 | </pre> | |
| 60 | </div> | |
| 61 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 62 | <td align="left"></td> | |
| 63 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
| 64 | Heller, John Fletcher<p> | |
| 65 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 66 | 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>) | |
| 67 | </p> | |
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