My managed classes need non-standard persistent attributes, such as CGPoint. 
Possibly, I'll need other C structs or enums as well.

The Core Data Programming Guide section about non-standard persistent 
attributes 
(link below) says there are two ways to go about this: transformable attributes 
and transient properties. The introductory paragraph gives me the impression 
that transformable attributes are the preferred method. Unfortunately, the 
section that describes that technique seems very short on details.

Do transformable attributes work only for object types or do they work for C 
structs and enums as well?

Any pointers to some how-to info would be greatly appreciated.

Link to the above-mentioned document:

http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreData/Articles/cdNSAttributes.html


Thank you much,
Soong



      
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