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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.ObjectHandleService"></a><a class="link" href="ObjectHandleService.html" title="Object handle service requirements">Object handle
service requirements</a>
</h3></div></div></div>
<p>
An object handle service must meet the requirements for a <a class="link" href="HandleService.html" title="Handle service requirements">handle
service</a>, as well as the additional requirements listed below.
</p>
<p>
In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
an object handle service class, <code class="computeroutput"><span class="identifier">a</span></code>
denotes a value of type <code class="computeroutput"><span class="identifier">X</span></code>,
<code class="computeroutput"><span class="identifier">b</span></code> denotes a value of type
<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span></code>, <code class="computeroutput"><span class="identifier">ec</span></code>
denotes a value of type <code class="computeroutput"><span class="identifier">error_code</span></code>,
and <code class="computeroutput"><span class="identifier">wh</span></code> denotes a value meeting
<a class="link" href="WaitHandler.html" title="Wait handler requirements"><code class="computeroutput"><span class="identifier">WaitHandler</span></code></a>
requirements.
</p>
<div class="table">
<a name="boost_asio.reference.ObjectHandleService.t0"></a><p class="title"><b>Table 19. ObjectHandleService requirements</b></p>
<div class="table-contents"><table class="table" summary="ObjectHandleService 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>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">wait</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span>
<span class="identifier">ec</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br>
<br> Synchronously waits for the object represented by handle
<code class="computeroutput"><span class="identifier">b</span></code> to become signalled.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span>
<span class="identifier">wh</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">void</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br>
<br> Initiates an asynchronous operation to wait for the object
represented by handle <code class="computeroutput"><span class="identifier">b</span></code>
to become signalled. The operation is performed via the <code class="computeroutput"><span class="identifier">io_service</span></code> object <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">get_io_service</span><span class="special">()</span></code>
and behaves according to <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous
operation</a> requirements.
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