test.swift

import Cocoa

class A : NSObject {
    
    init() { }
    
}

class B : A {

}

class C : A {

}

func Create<T:NSObject> () -> T {
    return T()
}

println(Create() as A) // <_TtC11lldb_expr_01A: 0x7fa1b0e1b030>
println(Create() as B) // <_TtC11lldb_expr_01B: 0x7fa1b0e203d0>
println(Create() as C) // <_TtC11lldb_expr_01C: 0x7fa1b0e1b630>

class D {
    
    init() { }
    
}

class E : D {
    
}

class F : D {
    
}

func Create2<T:D> () -> T {
    return T()
}

println(Create2() as D) // C11lldb_expr_01D (has 0 children)
println(Create2() as E) // C11lldb_expr_01D (has 0 children)
println(Create2() as F) // C11lldb_expr_01D (has 0 children)