Make ATTError an extensible struct#201
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Issue
Fixes #200.
What does this PR Do?
Converts
ATTErrorfrom an enum to a struct to allow for extending with additional application-specific error codes.ATTError(rawValue: 0)returns nil because 0x00 is the success code.All the pre-defined errors are set up so they return a non-Optional ATTError, and this should be API compatible with all existing code.
Where should the reviewer start?
ATTError.swift