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If interface A is a (direct or indirect) base of interface B, the following assignments do not require an explicit C++ cast:
- B_ptr to A_var
- B_ptr to A_ptr
- B_ptr to Object_var
- B_ptr to Object_ptr
- B_var to A_ptr
- B_var to Object_ptr
B_var cannot be assigned to A_var or a compile-time error occurs. To assign B_var to A_var:
- Use B::_duplicate on B_var to create B_ptr.
- Assign B_ptr to A_var.