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In overlapping polymorphism is it mandatory that the method of a mother class that will be superimposed on a subclass be abstract? Is there an exception for some POO language?
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It is not obliged and it is quite common that it is not. The only requirement is that it has the same signing.
Some languages may have a signature that only considers the method name, which is very easy.
Each language can do as it wants, but I don’t know any that requires this.
What exists is that in a given construction in some languages, such as the interface, it requires the method to be abstract, but not in a mother class. C++ has no interfaces.
Of course every abstract method needs to be superimposed. It might not require it, but then it would have no purpose to have all this mechanism.
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