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| 3 | <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> | |
| 4 | <title>Success or Exception</title> | |
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| 7 | <link rel="home" href="../../index.html" title="Chapter 1. Fiber"> | |
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| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h3 class="title"> | |
| 27 | <a name="fiber.callbacks.success_or_exception"></a><a class="link" href="success_or_exception.html" title="Success or Exception">Success or Exception</a> | |
| 28 | </h3></div></div></div> | |
| 29 | <p> | |
| 30 | A wrapper more aligned with modern C++ practice would use an exception, rather | |
| 31 | than an <code class="computeroutput"><span class="identifier">errorcode</span></code>, to communicate | |
| 32 | failure to its caller. This is straightforward to code in terms of <code class="computeroutput"><span class="identifier">write_ec</span><span class="special">()</span></code>: | |
| 33 | </p> | |
| 34 | <p> | |
| 35 | </p> | |
| 36 | <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">write</span><span class="special">(</span> <span class="identifier">AsyncAPI</span> <span class="special">&</span> <span class="identifier">api</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">data</span><span class="special">)</span> <span class="special">{</span> | |
| 37 | <span class="identifier">AsyncAPI</span><span class="special">::</span><span class="identifier">errorcode</span> <span class="identifier">ec</span> <span class="special">=</span> <span class="identifier">write_ec</span><span class="special">(</span> <span class="identifier">api</span><span class="special">,</span> <span class="identifier">data</span><span class="special">);</span> | |
| 38 | <span class="keyword">if</span> <span class="special">(</span> <span class="identifier">ec</span><span class="special">)</span> <span class="special">{</span> | |
| 39 | <span class="keyword">throw</span> <span class="identifier">make_exception</span><span class="special">(</span><span class="string">"write"</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span> | |
| 40 | <span class="special">}</span> | |
| 41 | <span class="special">}</span> | |
| 42 | </pre> | |
| 43 | <p> | |
| 44 | </p> | |
| 45 | <p> | |
| 46 | The point is that since each fiber has its own stack, you need not repeat | |
| 47 | messy boilerplate: normal encapsulation works. | |
| 48 | </p> | |
| 49 | </div> | |
| 50 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 51 | <td align="left"></td> | |
| 52 | <td align="right"><div class="copyright-footer">Copyright © 2013 Oliver Kowalke<p> | |
| 53 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 54 | 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>) | |
| 55 | </p> | |
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| 61 | </div> | |
| 62 | </body> | |
| 63 | </html> |