Defining subclasses at run time
Defining subclasses at run time
- Subject: Defining subclasses at run time
- From: Oleg Krupnov <email@hidden>
- Date: Mon, 11 Jun 2012 12:35:13 +0300
Hi,
I'm solving the following problem. I have a huge array of items of the
same class MyItem. All items need to share a certain global "context"
variable. Normally, I would wrap access to this variable in a
class-level (+) method of MyItem, like +[MyItem getContext].
Now the problem is that I need multiple arrays of MyItems have
different contexts. The solution could be to add the context pointer
as an ivar to each MyItem instance, but I would not like to waste
memory on that (the arrays are huge).
How do I solve this problem?
I have an idea that I could spawn new subclasses of MyClass at run
time, for each new array of MyItems, assigning each class with a
different class-level context variable, and then instantiating items
from that subclass. In this way, +[_runtime_subclass_of_MyItem
getContext] would return a different context value for each array.
This would reuse the "isa" pointer that's already in any NSObject
instance.
Is this possible in Obj-C? Or is there a better idea?
Thanks!
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