EnumIterator.swift

extension RawRepresentable where RawValue == Int {
	static func enumerate() -> Self {
		return self.init(rawValue: 0)!
	}

	static func makeIterator() -> AnyIterator<Self> {
		var index = 0

		return AnyIterator {
			let value = Self.init(rawValue: index)
			index += 1

			return value
		}
	}

	static var all: [Self] {
		return [Self](makeIterator())
	}
}

enum Section: Int {
	case Zero, One, Two, Three
}

for section in Section.makeIterator() {
	print(section)
}

Section.all