,</span> <span class="identifier">BOOST_SCOPED_ENUM</span><span class="special">(</span><span class="identifier">delimit_flag</span><span class="special">)</span> <span class="identifier">pre_delimit</span>
      <span class="special">,</span> <span class="identifier">Attr1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</span> <span class="keyword">const</span><span class="special"