swift 相关值を持つenumの比较

Posted 2021-05-19

// associated valuesを持つenumの比較
// via: https://stackoverflow.com/questions/24339807/how-to-test-equality-of-swift-enums-with-associated-values
extension RequestError: Equatable {}
    
func ==(lhs: RequestError, rhs: RequestError) -> Bool {
    switch (lhs, rhs) {
    case (.networkError, .networkError), (.badRequest, .badRequest):
        return true
        
    case let (.specific(lhsSpecific), .specific(rhsSpecific)):
        return lhsSpecific == rhsSpecific
        
    default:
        return false
    }
}