Protocols

This protocol needs to be implemented in order to add a requirement to a wrapped type. Implementers receive the wrapped type and need to determine if its values fulfill the requirements of the wrapper type. ~~~ struct NonEmptyStringValidator: Validator { static func validate(value: String) -> Bool { return !value.isEmpty } } ~~~

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public protocol Validator

Allows behaviour to be added to a validated type via protocol extensions.

e.g., ~~~ typealias PhoneNumber = Validated

extension ValidatedType where ValidatorType == PhoneNumberValidator { var regionCode: String { return // Parse and return region code } }

…

let phoneNumber = try PhoneNumber(00 1 917 555 2368) print(\(phoneNumber.regionCode)) ~~~

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public protocol ValidatedType