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In Kotlin, smart cast allows variables to be cast automatically in response to calling functions. Contracts can be used to make this happen. A simple model for a user with a sealed class is shown, where every user is either anonymous or authenticated. The is authenticated function is inherited by both subclasses, but each subclass has unique functions. For example, the prompt to sign in function is only available on the anonymous class, while the Greet function is only available on the authenticated class. In an app scenario, the screen can load differently based on user authentication status. A simple approach is shown where the specific type of user is checked for authentication.
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