Allow adding additional variables to existing FParser objects #480
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This allows users to add variables to existing and parsed FParser objects (for example copies of fully build parsers). The main use is to add variables to use
RegisterDerivative
from #463 to make them targets of custom derivatives on demand (i.e. at different levels in an automatic differentiation chain to get a high order derivative).I'm also using
friend
to allow theFunctionParserADBase
class access to private members ofFunctionParserBase
. These classes are closely tied together and the only alternative would be straight up modifyingFunctionParserBase
to put in the AD functionality.