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What are the disadvantages of designing an ADT to be a pointer? E.g. you create an...

What are the disadvantages of designing an ADT to be a pointer? E.g. you create an instance of the ADT with the express purpose of it only accessing data through a pointer?

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The disadvantages of designing an ADT to be a pointer are:
(1) It causes many inherent problems in dealing with pointers .
(2) Comparisons between objects do not work as expected, because they are only pointer comparisons (rather than pointed-to value comparisons)
(3)The implementation of the abstract type cannot control allocation and deallocation of objects of the type (creating a pointer to an object with a variable declaration and use it without creating an object).

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