Derived Collection of Enum Cases

github.com

Enumeration types without associated values (henceforth referred to as "simple enums") have a finite, fixed number of cases, yet working with them programmatically is challenging. It would be natural to enumerate all the cases, count them, determine the highest rawValue, or produce a Collection of them. However, despite the fact that both the Swift compiler and the Swift runtime are aware of this information, there is no safe and sanctioned way for users to retrieve it. Users must resort to various workarounds in order to iterate over all cases of a simple enum.

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