Hard to tell from the description, but it sounds like S is what the person who wrote the code chose to mean "some other type that doesn't have to be T".
See:
func test<T, S>(one : T, two : S) -> String
{
return "\(one) \(two)"
}
print(test(one: Double(1), two: true))
There are a few places where this can be useful, such as Maps or Dictionaries, where the key type can be anything, and the value type can also be some other anything. (Note: T and S can also be the same thing, like with a Dictionary<String,String>.)
ScottMichaud_LT
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