Tuple equatable

gistfile1.swift

func ==<A:Equatable, B:Equatable>(lhs:(A,B), rhs:(A,B)) -> Bool {
  return lhs.0 == rhs.0
    && lhs.1 == rhs.1
}

func ==<A:Equatable, B:Equatable, C:Equatable>(lhs:(A,B,C), rhs:(A,B,C)) -> Bool {
  return lhs.0 == rhs.0
    && lhs.1 == rhs.1
    && lhs.2 == rhs.2
}

func ==<A:Equatable, B:Equatable, C:Equatable, D:Equatable>(lhs:(A,B,C,D), rhs:(A,B,C,D)) -> Bool {
  return lhs.0 == rhs.0
    && lhs.1 == rhs.1
    && lhs.2 == rhs.2
    && lhs.3 == rhs.3
}

...