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lang-cpp
If you need [prevent assignment] to fail as well, then you must add a protected assignment operator to your interface.: This is the root of my problem. The cases where I need an interface to support assignment must be rare indeed. In the other hand, the cases where I want to pass an interface by reference (the cases where NULL is not acceptable), and thus, want to avoid a no-op or slicing that compile are much greater.private? In addition, you might want to deal with default- and copy-ctor.