static void Main() { ConcreteObjectA a = new ConcreteObjectA(); ConcreteObjectB b = new ConcreteObjectB(); StronglyTypedVisitor sv = new StronglyTypedVisitor(); //proper usage of code a.AcceptVisitor(sv); b.AcceptVisitor(sv); //now lets try to do some tricks GenericVisitor gv = new GenericVisitor(); try { //a.AcceptVisitor(gv); this will generate compile error (a as IObject).AcceptVisitor(gv); //oooo Im so great! } catch (ArgumentException ae) { Console.WriteLine("—————————————————————————————n{0}", ae); } //example with synchronization lost! try { //Im sure it was agreed that the GeneralVisitor accepts ConcreteB, maybe its just a bug, I will try with the interface //b.AcceptVisitor(gv); //this will generate compile error (b as IObject).AcceptVisitor(gv); //looks fine to me and the compilator, so it works! } catch (ArgumentException ae) { Console.WriteLine("—————————————————————————————n{0}", ae); } Console.ReadKey(); }
public void AcceptVisitor(StronglyTypedVisitor aVisitor) { aVisitor.HandleVisit(this); }