I see. Well, it seems that the original idea was for `set-model` to be generic.
Also, there is an undocumented `GENERIC: update-model ( model -- )` - I wonder what is its role in the whole thing.
Apparently, `set-model` WAS generic until commit 57893118e066536decc. The documentation is simply out of date by almost 10 years...
14.06.2017, 01:31, "John Benediktsson" <mrj...@gmail.com>:
I'm not sure what the original author was thinking of, but you can always do this to perform validation:TUPLE: my-model < model ;: <my-model> ( value -- model ) my-model new-model ;M: my-model value<<over even? [ drop throw ] unless call-next-method ;Then if you try and construct it with an odd number or set it with an odd number value it throws.,On Tue, Jun 13, 2017 at 2:24 PM, Alexander Ilin <ajs...@yandex.ru> wrote:Hello!
I have found this text in the documentation: "Models can override requests to change their value, for example to perform validation: set-model ( value model -- )".
How would that work, exactly? `set-model` is not a generic that could be overridden. I don't understand the mechanism suggested by the help.
For example, I'm developing a gadget for a certain type of objects, and I want only that class of objects to be assignable to the gadget's model slot. How would I do that kind of validation?
Or is it not what I need in my case?
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