Weak object array in Swift

Question

I would like to create an object array as a property of another class in Swift, such as:

class person{
 var livingInHouse : house
 name : String
}
class house{
 var personArray : [person]
}

My constraints are:

I would like to easily access the objects in the personArray using subscripts: e.g. houseInstance.personArray[1].name = "Steve"
I would like to create the personArray so that the person objects are deallocated when houseInstance object is deallocated. What is the best method in Swift to do this?

possible duplicate of [How do I declare an array of weak references in Swift?](http://stackoverflow.com/questions/24127587/how-do-i-declare-an-array-of-weak-references-in-swift) — Jeffery Thomas, Jan 26 '15 at 13:31
Note that as a general rule, types (ie., classes) should be capitalized for legibility and distinction. — David Berry, Jan 26 '15 at 17:33

score 0 · Answer 1 · answered Jan 26 '15 at 13:24

From what you say, you want the person living in an house "alive" as long as their house is alive, so it is obvious that the house must "own" the persons.

Your class Person however just maintain a reference to the house for convenience, it doesn't own it (else it would be bad!)

so :

class house
{
    var personArray : person[]
}

class person
{
    unowned var livingInHouse : house
    name : String
}

You could then provide some convenience method to your house such as:

func add(Person p)
{
personArray += p;
p.livingHouse = self;
}

Weak object array in Swift

1 Answers1