C++ Reference: class CPFeasibilityFilter

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This filter accepts deltas for which the assignment satisfies the constraints of the Solver. This is verified by keeping an internal copy of the assignment with all Next vars and their updated values, and calling RestoreAssignment() on the assignment+delta. TODO(user): Also call the solution finalizer on variables, with the exception of Next Vars (woud fail on large instances). WARNING: In the case of mandatory nodes, when all vehicles are currently being used in the solution but uninserted nodes still remain, this filter will reject the solution, even if the node could be inserted on one of these routes, because all Next vars of vehicle starts are already instantiated. TODO(user): Avoid such false negatives.

Method
Accept	Return type: bool Arguments: const Assignment* delta, const Assignment* deltadelta, int64 objective_min, int64 objective_max
CPFeasibilityFilter	Return type: explicit Arguments: RoutingModel* routing_model
~CPFeasibilityFilter
DebugString	Return type: std::string
OnSynchronize	Return type: void Arguments: const Assignment* delta