    </span><span class=identifier>DerivedT</span><span class=special>&amp; </span><span class=identifier>derived</span><span class=special>();
        </span><span class=identifier>DerivedT </span><span class=keyword>const</span><span class=special>&amp; </span><span class=identifier>derived</span><span class=special>() </span><span class=keyword>const</span><span class=special>;

        </span><span class=keyword>template </span><span class=special>&lt;</span><span class=keyword>typename </span><span clas