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You're talking about multiple levels of single inheritance, where you're absolutely right, but the OP is about multiple inheritance. If you implement 5 unrelated interfaces, you have 5 unrelated base class subobjects in your derived class object, and each of those subobjects needs to be a valid object with its own base class-compatible vtable pointer. They can't overlap or share a single vtable pointer because any code taking a pointer to the abstract base type must be able to use it as such.

Useless
– Useless

2018-10-11 09:37:28 +00:00
Commented Oct 11, 2018 at 9:37

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