nto this completion handler below.
</span><span class="c1"></span>    <span class="o">:</span> <span class="k">public</span> <span class="n">asio</span><span class="o">::</span><span class="n">async_result</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="p">,</span> <span class="kt">void</span><span class="p">(</span><span class="n">outcome</span><span class="o">::</span><span class="n">result</span><span class="o">&lt;</span><span class="n">T</span><span class="p">,</span