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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.IoObjectService"></a><a class="link" href="IoObjectService.html" title="I/O object service requirements">I/O object service
requirements</a>
</h3></div></div></div>
<p>
An I/O object service must meet the requirements for a <a class="link" href="Service.html" title="Service requirements">service</a>,
as well as the requirements listed below.
</p>
<p>
In the table below, <code class="computeroutput">X</code> denotes an I/O object service class,
<code class="computeroutput">a</code> and <code class="computeroutput">ao</code> denote values of type <code class="computeroutput">X</code>,
<code class="computeroutput">b</code> and <code class="computeroutput">c</code> denote values of type <code class="computeroutput">X::implementation_type</code>,
and <code class="computeroutput">u</code> denotes an identifier.
</p>
<div class="table">
<a name="boost_asio.reference.IoObjectService.t0"></a><p class="title"><b>Table 21. IoObjectService requirements</b></p>
<div class="table-contents"><table class="table" summary="IoObjectService requirements">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
expression
</p>
</th>
<th>
<p>
return type
</p>
</th>
<th>
<p>
assertion/note<br> pre/post-condition
</p>
</th>
</tr></thead>
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<tr>
<td>
<p>
<code class="computeroutput">X::implementation_type</code>
</p>
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput">X::implementation_type u;</code>
</p>
</td>
<td>
</td>
<td>
<p>
note: <code class="computeroutput">X::implementation_type</code> has a public default
constructor and destructor.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting">a.construct(b);
</pre>
<p>
</p>
</td>
<td>
</td>
<td>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting">a.destroy(b);
</pre>
<p>
</p>
</td>
<td>
</td>
<td>
<p>
note: <code class="computeroutput">destroy()</code> will only be called on a value that
has previously been initialised with <code class="computeroutput">construct()</code> or
<code class="computeroutput">move_construct()</code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting">a.move_construct(b, c);
</pre>
<p>
</p>
</td>
<td>
</td>
<td>
<p>
note: only required for I/O objects that support movability.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting">a.move_assign(b, ao, c);
</pre>
<p>
</p>
</td>
<td>
</td>
<td>
<p>
note: only required for I/O objects that support movability.
</p>
</td>
</tr>
</tbody>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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