class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">concurrency_hint</span><span class="special">);</span>
  <span class="emphasis"><em>&#187; <a class="link" href="io_service/overload2.html" title="io_service::io_service (2 of 2 overloads)">more...</a></em></span>
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