is no existing implementation of the
            service, then the <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
            will create a new instance of the service.
          </p>
<h6>
<a name="boost_asio.reference.execution_context.use_service.overload2.h0"></a>
            <span class="phrase"><a name="boost_asio.reference.execution_context.use_service.overload2.parameters"></a></span><a class="link" href="overload2.html#boost_asio.re