Memory Leaks in Swift Playground

gistfile1.swift

import Foundation

var activeObjects = Int[]()

var id = 1000
var indentLevel = 0

func indent(){
  indentLevel+=2
}

func outdent(){
  indentLevel -= 2
}

class Info {
  var name: String
  var uuid = ++id
  
  init(name: String){
    self.name = name
    log("\(self.name)/init()")
    activeObjects += uuid
  }
  
  deinit{
    log("\(self.name)/deinit()")
    if let idx = find(activeObjects, self.uuid) {
      activeObjects.removeAtIndex(idx)
    }
    else {
      log("odd: I wasn't in the active objects list!")
    }
    
  }
  
  func log(msg: String){
    var ind = ""
    for i in 0..indentLevel {
      ind += "."
    }
    println("\(uuid) -- \(ind)\(msg)")
  }
}

class X : Info {
  init(prefix : String){
    super.init(name: "\(prefix):X")
  }
}

class Test : Info{
  init(prefix: String){
    super.init(name: "\(prefix):Test")
  }
  
  func test1() {
    log("\(name)/test1()")
    indent()
    var x : X?
    x=X(prefix: "\(name)/test1")
    x=nil
    test2(X(prefix: name))
    outdent()
  }
  
  func test2(x: X){
    log("\(name)/test2()")
  }
  
  func test3(){
    log("\(name)/test3()")
    indent()
    var t = Test(prefix: "\(name)/test3")
    t.test1()
    outdent()
  }
  
  func test4(t: Test){
    log("\(name)/test4()")
    indent()
    t.test1()
    t.test2(X(prefix: "\(name)/test4"))
    t.test3()
    outdent()
  }
}


var prefix = ""
var t : Test?
t = Test(prefix: prefix)
t!.test1()
println("")
t!.test2(X(prefix: prefix))
println("")
t!.test3()
println("")
t!.test4(Test(prefix: prefix))

t = nil

println("\nactive objects: ")
for item in activeObjects {
  println (item)
}

Playground Console Output

1001 -- :Test/init()
1001 -- :Test/test1()
1002 -- ..:Test/test1:X/init()
1003 -- ..:Test:X/init()
1001 -- ..:Test/test2()
1003 -- ..:Test:X/deinit()

1004 -- :X/init()
1001 -- :Test/test2()
1004 -- :X/deinit()

1001 -- :Test/test3()
1005 -- ..:Test/test3:Test/init()
1005 -- ..:Test/test3:Test/test1()
1006 -- ....:Test/test3:Test/test1:X/init()
1007 -- ....:Test/test3:Test:X/init()
1005 -- ....:Test/test3:Test/test2()
1007 -- ....:Test/test3:Test:X/deinit()

1008 -- :Test/init()
1001 -- :Test/test4()
1008 -- ..:Test/test1()
1009 -- ....:Test/test1:X/init()
1010 -- ....:Test:X/init()
1008 -- ....:Test/test2()
1010 -- ....:Test:X/deinit()
1011 -- ..:Test/test4:X/init()
1008 -- ..:Test/test2()
1011 -- ..:Test/test4:X/deinit()
1008 -- ..:Test/test3()
1012 -- ....:Test/test3:Test/init()
1012 -- ....:Test/test3:Test/test1()
1013 -- ......:Test/test3:Test/test1:X/init()
1014 -- ......:Test/test3:Test:X/init()
1012 -- ......:Test/test3:Test/test2()
1014 -- ......:Test/test3:Test:X/deinit()

active objects: 
1001
1002
1005
1006
1008
1009
1012
1013