"identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">parse</span><span class="special">;</span>

    <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">input</span><span class="special">);</span>
    <span class="k