Web Reference: Jan 30, 2016 · Simply said, upcasting allows one to treat a derived class as a base class (via its common interface). Down-casting is less useful, and IMO should be avoided whenever one can. In general is a sign of bad design, as one rarely needs to convert a Base object to a derived one. It can be done (and the result checked) via dynamic_cast, like. Upcasting allows us to treat a derived type as though it were its base type. That's how we decouple ourselves from knowing about the exact type we are dealing with. Note that it doesn't say "If you're a Triangle, do this, if you're a Circle, do that, and so on." Upcasting, as its name suggests, combines two concepts. First, a casting operation converts a value represented by one data type to an appropriate value represented by a different type. Second, when we cast objects, we always do so in the context of inheritance.
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