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<para>override this to define the function </para>        </briefdescription>
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<para>base class for evaluating a function: void -&gt; void</para><para>This class is designed to be subclassed in Python or C++ and is callable from both places. It uses SWIG&apos;s &quot;director&quot; feature to implement the magic. It&apos;s slow. Don&apos;t use it in a performance critical path. </para>    </briefdescription>
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<para>Override eval to define the behavior. Use calleval to invoke eval (this kludge is required to allow a python specific &quot;shim&quot; to be inserted. </para>    </detaileddescription>
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