SWI-Prolog -- Send methods

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Send methods

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    - Classes
      - class chain_hyper
        
        Send methods
        
        chain_hyper->unlink_to
        
        chain_hyper->unlink_from

1.21.1 Send methods

chain_hyper ->unlink_to:: object->free hyper<-from.
chain_hyper ->unlink_from:: If the hyper<-to objects is alreeady being destroyed (see object->unlinking), do nothing. Else, if the hyper<-to object understands chain_hyper->destroy, invoke this method, else invoke object->free