<map id="Graphical Class Hierarchy" name="Graphical Class Hierarchy"> <area shape="rect" id="node1" href="$a00027.html" title="Template base class for the observers of some observed_subject." alt="" coords="6,5,181,46"/> </map>
<map id="Graphical Class Hierarchy" name="Graphical Class Hierarchy"> <area shape="rect" id="node1" href="$a00027.html" title="Template base class for the observers of some observed_subject." alt="" coords="6,5,181,46"/> </map>