">|</span> <span class="identifier">eps</span><span class="special">[</span><span class="identifier">error</span><span class="special">()];</span> <span class="comment">// Call error if a, b, and c fail to match</span>
</pre>
<h6>
<a name="spirit.qi.reference.auxiliary.eps.h2"></a>
            <span class="phrase"><a name="spirit.qi.reference.auxiliary.eps.semantic_predicate"></a></span><a class="link" href="eps.html#spirit.qi.reference.auxiliary.eps.semantic_predicate">Semantic
            Predicate</a>
  