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What is a protocol class?
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Answer / harendra pal
An abstract class is a protocol class if:
ο it neither contains nor inherits from classes that contain member data, non-virtual functions, or private (or protected) members of any kind.
ο it has a non-inline virtual destructor defined with an empty implementation,
ο all member functions other than the destructor including inherited functions, are declared pure virtual functions and left undefined.
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