I have to create simple singleton object factory for some types of objects. The problem is that I can't find smart way to prevent user from creating object instances by constructors. I know that I can move constructors to private/protected section but how will the factory create new objects now when constructors are private/protected? Making factory a friend of every class isn't really smart as I need to predeclare factory in every header and write aditional "friend Factory;" in every class. How to do this correct?
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