() 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 the multi_pass reference this instance is compared </span>
        <span class="comment">//          to</span>
        <span class="comment">//</span>
        <span class="comment">// This function is expected to return true if the current instance</span>
        <span class="comment">// is equal to the righ