Re: [Pyobjc-dev] NSArray removes KeyValueCoding.kvc wrapper?

[Ronald O. <ron...@ma...>]

On Sep 24, 2006, at 6:47 PM, James R Eagan wrote:

> Ahh, that makes some sense, but isn't it a bit of overhead to add a
> wrapper instantiation on top of every key value lookup?
>
> What I ended up doing was to keep a lookup dictionary that caches the
> kvc wrappers.

The kvc wrappers are pretty lightweight. You don't have to use them  
anyway, it is just a convenience to get nicer looking code, so if  
speed is a concern you can use the KVC methods directly (valueForKey:  
and friends).

I want to do some experimentation to use KVC everywhere, just like in  
NSManagedObject. That is, anObject.foo fetches the value of a key and  
anObject.bar = 42 sets a key using KVC. There is one major problem  
here: the setter method in Objective-C doesn't have a prefix in its  
name, which causes a problem in Python because methods and attributes  
share a single namespace and we therefore can't know if  
'someObject.foo' is meant to be a reference to a method or the value  
of an instance variable.

Ronald