Brian Pratt bppr

National Parks

I hereby claim:

To claim this, I am signing this object:

	protocol Features {}
	protocol ProFeatures: Features {}

	protocol Account {
	associatedtype FeatureType
	var features: FeatureType { get set }
	}

	class ProAccount<T: Features>: Account {
	typealias FeatureType = T

	fileprivate func gcd(_ a: Int, _ b: Int) -> Int {
	return b == 0 ? a : gcd(b, a % b)
	}

	fileprivate func abs(_ n: Int) -> Int {
	return n > 0 ? n : -n
	}

	struct Ratio {
	let numerator: Int

	extension String {
	var length: Int { get { return characters.count } }
	var first: Character { get { return self[self.startIndex] }}
	var last: Character { get { return self[self.endIndex.predecessor()] }}

	func contains(fragment: String) -> Bool {
	return self.indexOf(fragment) != nil
	}

	func indexOf(fragment: String) -> String.Index? {