yword">typename</span> <span class="identifier">Skipper</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">preprocessor</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">grammar</span><span class="special">&lt;</span><span class="identifier">Iterator</span><span class="special">,</span> <span class="identifier">Sk