gistfile1.swift

// Playground - noun: a place where people can play

struct MySet<T: Hashable> : DebugPrintable {

    var store: Dictionary<T,Void>

    init() {
        store = [:]
    }

    var debugDescription : String { return "fake description" }

    mutating func add(v: T) -> Void {
        println("add v: \(v)")
        store[v] = ()
        println("store: \(store)")
    }
}

var s = MySet<String>()
var s2 = MySet<Int>()
s.add("foo")
s.add("bar")
s2.add(23)
s2.add(42)
s
s2