GNU compiler warning “class has virtual functions but non-virtual destructor”

Question

I have defined an interface in C++, i.e. a class containing only pure virtual functions.

I want to explicitly forbid users of the interface to delete the object thro

Answer 1

If you had code in one of ITest's methods that tried to delete itself (a bad idea, but legal), the derived class's destructor wouldn't be called. You should still make your destructor virtual, even if you never intend to delete a derived instance via a base-class pointer.