comment">/// Set the stream through which the message body could be written</span>
    <span class="keyword">void</span> <span class="identifier">set_outstream</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">concurrency</span><span class="special">::</span><span class="identifier">streams</span><span class="special">::</span><span class="identifier">ostream</span> <span class="special">&amp;</span><span class="identifier">outstream</span><span class="special">