span><span class="identifier">io_service</span> <span class="special">&amp;</span> <span class="identifier">io_service</span><span class="special">);</span>
  <span class="emphasis"><em>&#187; <a class="link" href="work/overload1.html" title="io_service::work::work (1 of 2 overloads)">more...</a></em></span>
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          Copy constructor notifies the <a class="link" href="../io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a> that wo