"Plus Generator (+a)">Plus (unary
                <code class="computeroutput"><span class="special">+</span></code>)</a> operator,
              </li>
<li class="listitem">
                <a class="link" href="../operator/optional.html" title="Optional Generator (-a)">Optional
                (unary <code class="computeroutput"><span class="special">-</span></code>)</a> operator,
              </li>
<li class="listitem">
                <a class="link" href="../operator/and_predicate.html" title="And-Pred