Re: does transformedValueClass matter?
Re: does transformedValueClass matter?
- Subject: Re: does transformedValueClass matter?
- From: Matt Neuburg <email@hidden>
- Date: Thu, 02 Mar 2006 21:46:26 -0800
- Thread-topic: does transformedValueClass matter?
On or about 3/2/06 9:30 PM, thus spake "Scott Anguish" <email@hidden>:
>
> On Mar 2, 2006, at 11:29 PM, Matt Neuburg wrote:
>
>> Like Tom Harrington in this thread...
>>
>> <http://www.cocoabuilder.com/archive/message/cocoa/2005/11/23/150949>
>>
>> ...I find the documentation on NSValueTransformer's
>> +transformedValueClass
>> bizarre. We are declaring a class, but what class? It is perfectly
>> legal for
>> a reversible transformation to transform a class A object into a
>> class B
>> object and (reversing) a class B object into a class A object, so
>> which
>> should I return from transformedValueClass - A or B?
>>
>
> there is a bug in the current doc (which has been fixed already)
> that says that the transformedValueClass is used in both the
> 'forward' and reverse transformations.. it is actually only used in
> the 'forward' one.
Okay. Tell me more. In the "forward" one, does it represent the class that
transformedValue expects (as input) or the class that it produces (as
output)? Because I would think from the docs that it would be the output,
but the CLStringNumberValueTransformerexample here:
<http://www.cocoalab.com/developer/classes/valuetransformers.htm>
<http://www.cocoalab.com/developer/classes/CLValueTransformers.zip.bin>
...has it the other way around. Yet the example does not break. Meanwhile,
the examples in Examples use NSObject, which is as non-committal as you can
get.
> it is useful information to the runtime
But not useful enough as to affect the functionality of the transformer? m.
--
matt neuburg, phd = email@hidden, http://www.tidbits.com/matt/
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