generics - Swift - Creating a hashable tuple-like struct -


i'm trying create hashable tuple-like object can hold type of object use key in dictionary. use structure in 2 places, once hold 2 ints, , once hold double , mentioned 2 int struct.

my current implementation cheats little bit. created struct suple holds 2 ints, , hashable, , struct duple holds double , suple, , hashable. works, figure there must better, cleaner way implement this. after searching , messing around generics can't seem work, advice appreciated.

edit: code looks practically identical anton's except after == in declaration of equality. didn't realize needed, , after adding that, works!

something this?

struct duplet<a: hashable, b: hashable>: hashable {     let one:     let two: b      var hashvalue: int {         return one.hashvalue ^ two.hashvalue     }      init(_ one: a, _ two: b) {         self.one = 1         self.two = 2     } }  func ==<a, b> (lhs: duplet<a, b>, rhs: duplet<a, b>) -> bool {     return lhs.one == rhs.one && lhs.two == rhs.two }  let = duplet<int, int>(4, 2)  a.one a.two a.hashvalue  let b = duplet<double, double>(1.0, 2.0)  b.one b.two b.hashvalue  let c = duplet<int, double>(4, 5.0)  c.one c.two c.hashvalue

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