r>nil_t</span><span class=special>()); 
        </span><span class=special>}

        </span><span class=keyword>template </span><span class=special>&lt;</span><span class=keyword>typename </span><span class=identifier>AttrT</span><span class=special>, </span><span class=keyword>typename </span><span class=identifier>IteratorT</span><span class=special>&gt;
        </span><span class=identifier>match</span><span class=special>&lt;</span><span class=identifier>AttrT</span><span class=special>&gt;
        </s