r">mp</span><span class="special">,</span> <span class="identifier">MultiPass</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">rhs</span><span class="special">);</span>

        <span class="comment">// less_than is called whenever multi_pass::operator&lt;() is invoked</span>
        <span class="comment">//</span>
        <span class="comment">//   mp:    is a reference to the whole multi_pass instance</span>
        <span class="comment">//   rhs:   is t