12.5.1 Access control

class A {
    private namespace Key
    private var friends = [ B ]
    function beMyFriend( suitor ) {
        for each( friend in friends )
        {
            if( suitor is friend ) return Key
        }
        return null
    }
    Key function makeMyDay() 
    { 
        trace("making my day") 
    } 
}

class B {
    function befriendAnA(a:A) {
        var key : Namespace = a.beMyFriend(this)
        if( key != null )
        {
            a.key::makeMyDay()
        }
    }
}