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154 lines
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>I/O object service requirements</title>
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<a accesskey="p" href="IoControlCommand.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="IteratorConnectHandler.html"><img src="../../next.png" alt="Next"></a>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.IoObjectService"></a><a class="link" href="IoObjectService.html" title="I/O object service requirements">I/O object service requirements</a>
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</h3></div></div></div>
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<p>
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An I/O object service must meet the requirements for a <a class="link" href="Service.html" title="Service requirements">service</a>,
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as well as the requirements listed below.
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</p>
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<p>
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In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
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an I/O object service class, <code class="computeroutput"><span class="identifier">a</span></code>
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and <code class="computeroutput"><span class="identifier">ao</span></code> denote values of type
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<code class="computeroutput"><span class="identifier">X</span></code>, <code class="computeroutput"><span class="identifier">b</span></code>
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and <code class="computeroutput"><span class="identifier">c</span></code> denote values of type
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<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span></code>, and <code class="computeroutput"><span class="identifier">u</span></code> denotes an identifier.
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</p>
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<div class="table">
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<a name="asio.reference.IoObjectService.t0"></a><p class="title"><b>Table 23. IoObjectService requirements</b></p>
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<div class="table-contents"><table class="table" summary="IoObjectService requirements">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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expression
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</p>
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</th>
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<th>
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<p>
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return type
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</p>
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</th>
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<th>
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<p>
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assertion/note<br> pre/post-condition
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span> <span class="identifier">u</span><span class="special">;</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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note: <code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span></code> has a public
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default constructor and destructor.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">construct</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span>
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</pre>
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</td>
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<td>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td>
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<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span>
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</pre>
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</td>
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<td>
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</td>
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<td>
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<p>
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note: <code class="computeroutput"><span class="identifier">destroy</span><span class="special">()</span></code>
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will only be called on a value that has previously been initialised
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with <code class="computeroutput"><span class="identifier">construct</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">move_construct</span><span class="special">()</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">move_construct</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">c</span><span class="special">);</span>
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</pre>
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</td>
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<td>
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</td>
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<td>
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<p>
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note: only required for I/O objects that support movability.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">move_assign</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">ao</span><span class="special">,</span> <span class="identifier">c</span><span class="special">);</span>
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</pre>
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</td>
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<td>
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</td>
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<td>
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<p>
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note: only required for I/O objects that support movability.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div>
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<hr>
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<div class="spirit-nav">
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