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<title>Object handle service requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="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="asio.reference.ObjectHandleService.t0"></a><p class="title"><b>Table&#160;19.&#160;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.
                </p>
              </td>
</tr>
</tbody>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2014 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>)
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