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Message: [QUOTE="jpalecek, post: 2982514"] .... boring and irrelevent stuff deleted ... No. It is because, you have acually two operator='s in F2. The first inherited from Fraction and taking Fraction& as rhs and the second new one with F2 as rhs. To actually override the Fraction's opertator=, you need the operator= to have exactly the same arguments, ie. Fraction2& Fraction2::operator=(const Fraction&); I think (but am not sure) it's possible to return Fraction2 here. You will probably have to use dynamic_cast to downcast the rhs from Fraction to Fraction2 Regards Jiri Palecek [/QUOTE]