[fpc-pascal] Implementing Factory Method with Pascal

[Anthony Walter]

type
  IBarkable = interface(IInterface)
  ['{B241068F-2ED9-43C7-066B-778B94CB58F9}']
    procedure Bark;
  end;

  TAnimal = class(IInterface)
  end;

  TDog = class(TAnimal, IBarkable)
  public
    procedure Live; override;
    procedure Bark;
  end;

and later ...

if Animal is IBarkable then (Animal as IBarkable).Bark;
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