Retrieve the data of a general constraint of type ABS. Calling this function for a general constraint of different type leads to an exception. You can query the GenConstrType attribute to determine the type of the general constraint.
See also addGenConstrAbs for a description of the semantics of this general constraint type.
genconstr: The general constraint object of interest.
A tuple (resvar, argvar) that contains the data of the general constraint:
resvar (Var): Resultant variable of ABS constraint.
argvar (Var): Argument variable of ABS constraint.
(resvar, argvar) = model.getGenConstrAbs(model.getGenConstrs())