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179 lines
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<title>I/O object service requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.IoObjectService"></a><a class="link" href="IoObjectService.html" title="I/O object service requirements">I/O object service
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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">X</code> denotes an I/O object service class,
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<code class="computeroutput">a</code> and <code class="computeroutput">ao</code> denote values of type <code class="computeroutput">X</code>,
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<code class="computeroutput">b</code> and <code class="computeroutput">c</code> denote values of type <code class="computeroutput">X::implementation_type</code>,
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and <code class="computeroutput">u</code> denotes an identifier.
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</p>
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<div class="table">
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<a name="boost_asio.reference.IoObjectService.t0"></a><p class="title"><b>Table 21. 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">X::implementation_type</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">X::implementation_type u;</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">X::implementation_type</code> has a public default
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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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<p>
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</p>
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<pre class="programlisting">a.construct(b);
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</pre>
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<p>
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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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</p>
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<pre class="programlisting">a.destroy(b);
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</pre>
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<p>
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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">destroy()</code> will only be called on a value that
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has previously been initialised with <code class="computeroutput">construct()</code> or
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<code class="computeroutput">move_construct()</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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<p>
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</p>
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<pre class="programlisting">a.move_construct(b, c);
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</pre>
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<p>
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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: 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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<p>
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</p>
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<pre class="programlisting">a.move_assign(b, ao, c);
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</pre>
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<p>
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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: 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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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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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></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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