ifier">UnaryParser</span></code></a><span class="special">&lt;</span><span class="identifier">Derived</span><span class="special">&gt;</span></code>
          derives from <code class="computeroutput"><span class="identifier">parser</span><span class="special">&lt;</span><span class="identifier">Derived</span><span class="special">&gt;</span></code>.
        </p>
<p>
          unary_parser&lt;Derived&gt;, has these expression requirements on Derived:
        </p>
<div class="itemizedlist"><ul class="itemize