or.
        </p>
<pre class="programlisting"><a class="link" href="io_context/overload1.html" title="io_context::io_context (1 of 2 overloads)">io_context</a>();
  <span class="emphasis"><em>&#187; <a class="link" href="io_context/overload1.html" title="io_context::io_context (1 of 2 overloads)">more...</a></em></span>

explicit <a class="link" href="io_context/overload2.html" title="io_context::io_context (2 of 2 overloads)">io_context</a>(
    int concurrency_hint);
  <span class="emphasis"><em>&#187; <a 