Should a base class be marked abstract if there are no abstract members?

Question

Can a class be considered abstract if it does not have abstract members? Even if there is no practical reason for directly creating an instance? (except unit tests)

Answer 1

Yes, it is reasonable and useful to designate explicitly as an abstract base class that should not be created, even in the absence of abstract methods.

• It provides general guidance so that abstract classes are not sheets.
• This prevents other programmers from instantiating the class. This may make it easier for you to add abstract methods to it later.

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