pped. A predicate function object controls
        which elements are skipped. When the predicate is applied to an element,
        if it returns <code class="computeroutput"><span class="keyword">true</span></code> then the
        element is retained and if it returns <code class="computeroutput"><span class="keyword">false</span></code>
        then the element is skipped over. When skipping over elements, it is necessary
        for the filter adaptor to know when to stop so as to avoid going past the
 