Quote: to use an abstract type as part of a concrete type, separate the abstract object into two parts: a handle providing the user interface and a representation holding the object's state

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[If an abstract type is used to define a concrete type, the interface is permanently tied to the implementation, objects can not be allocated on the stack, and the size of the object is fixed.] A popular technique for dealing with these … providing the user interface and a representation holding … [The handle provides a pointer to the representation and a small amount of additional data.]   Google-1   Google-2

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