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Can I write a class which has virtual methods - (which can be overridden but have a default behaviour) and also abstract methods - (which have to be overridden)
Can I have a definition in which I define implementations for the virtuals but not the abstracts?
Additionally can I create abstract methods that don't have an implementation in a non abstract / pure virtual class?
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Can I write a class which has virtual methods - (which can be overridden but have a default behaviour) and also abstract methods - (which have to be overridden)
Yes.
Can I have a definition in which I define implementations for the virtuals but not the abstracts?
Yes.
Additionally can I create abstract methods that don't have an implementation in a non abstract / pure virtual class?
No. The presence of pure virtual members prohibits you from creating class instances, i.e. makes the class abstract.
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It' s ok to have some virtual methods with reasonable default implementation, while other pure virtual methods have to be implemented in derived classes.
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