/span><span class="identifier">add_stream</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">make_shared</span><span class="special">&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ofstream</span> <span class="special">&gt;(</span><span class="string">"sample.log"</span><span class="special">));</span>
    <span class="special">}</span> <span class="comment">// the backend get