Enclosing Object

BlitzMax Forums/BlitzMax Beginners Area/Enclosing Object

z80jim

(Posted 2006) [#1]

Is there a way for an object that is a field of another object to reference the enclosing object? Sort of like super references the parent object?

For example:

Type TOuterObject
   field innerobject : TInnerObject
end type

I want a method in TInnerObject to be able to call a method in TOuterObject without having to tell TInnerObject who TOuterObject is. It seems TInnerObject must know who it is a member of?

Thanks,
Jim

Dreamora

(Posted 2006) [#2]

There is no such facility unless you save a reference to the parent object.

z80jim

(Posted 2006) [#3]

Seems like it would be handy and an easy thing to implement in the language. I would think internally the object must be aware of what object it is a member of.

N	(Posted 2006) [#4]

>I would think internally the object must be aware of what object it is a member of.

Nope.

Grey Alien

(Posted 2006) [#5]

In delphi, every object has a field called owner, handy eh?

N	(Posted 2006) [#6]

That's part of its implementation, not the actual language.

Grey Alien

(Posted 2006) [#7]

I never said it was part of the language. It's part of the "object" implmentation which everything is descended from.

FlameDuck

(Posted 2006) [#8]

What if an object has more than one owner?

I think the most elegant solution is to pass the 'owner' object along as a parameter on any methods you might want to invoke.