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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_asio.reference.Service"></a><a class="link" href="Service.html" title="Service requirements">Service requirements</a> |
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| <p> |
| A class is a service if it is publicly derived from another service, or if |
| it is a class derived from <code class="computeroutput"><span class="identifier">io_service</span><span class="special">::</span><span class="identifier">service</span></code> |
| and contains a publicly-accessible declaration as follows: |
| </p> |
| <pre class="programlisting"><span class="keyword">static</span> <span class="identifier">io_service</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span> |
| </pre> |
| <p> |
| All services define a one-argument constructor that takes a reference to |
| the <code class="computeroutput"><span class="identifier">io_service</span></code> object that |
| owns the service. This constructor is <span class="emphasis"><em>explicit</em></span>, preventing |
| its participation in automatic conversions. For example: |
| </p> |
| <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">my_service</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">io_service</span><span class="special">::</span><span class="identifier">service</span> |
| <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="keyword">static</span> <span class="identifier">io_service</span><span class="special">::</span><span class="identifier">id</span> <span class="identifier">id</span><span class="special">;</span> |
| <span class="keyword">explicit</span> <span class="identifier">my_service</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">&</span> <span class="identifier">ios</span><span class="special">);</span> |
| <span class="keyword">private</span><span class="special">:</span> |
| <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">shutdown_service</span><span class="special">();</span> |
| <span class="special">...</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| A service's <code class="computeroutput"><span class="identifier">shutdown_service</span></code> |
| member function must cause all copies of user-defined handler objects that |
| are held by the service to be destroyed. |
| </p> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
| </p> |
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