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When working with virtual functions, we can encounter situations where we need to return a different type from an overriding function.

While this isn't possible in the general case, the types returned are allowed to be different if they are covariant (the overriding function returns a derived type).

The prototypical use for covariant return types is a clone() function.

Compiler Explorer link: https://compiler-explorer.com/z/qTxErsxbE