span> <span class="identifier">future_t</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">fibers</span><span class="special">::</span><span class="identifier">buffered_channel</span><span class="special">&lt;</span> <span class="identifier">future_t</span> <span class="special">&gt;</span> <span class="identifier">channel_t</span><span class="special">;</span>
    <span class="keyword">au