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virtual ~A()

But the destructors are not declared virtual. Does not that mean that only ~C() will be called?

Iso C++ 2011 10.4 $6 Member functions can be called from a constructor (or destructor) of an abstract class; the effect of making a virtual call (10.3) to a pure virtual function directly or indirectly for the object being created (or destroyed) from such a constructor (or destructor) is undefined.

Please fix this test. There is always wrong result with two values 211 and 112. But there is only one available to choose.