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Message: [QUOTE="Ingo R. Homann, post: 1999454"] Hi, No, I think, the 2-class-design is better: Consider you have a method that wants to indicate that it does not change the Parameter: void foo(UnmodifiableInt i) {...} Now, why should it be impossible to pass a ModifiableInt to that method? And vice versa: Consider a method is returning an ModifiableInt: ModifiableInt foo() {...} Why should it be impossible to assign the returned value to a variable of type UnmodifiableInt to document that the variable will not be modified? Ciao, Ingo [/QUOTE]