[racket] match in Advanced Student?

The HtDP match implementation has a list of such things and goes and
finds them to turn them back into the non-primitive bound things.
That's why it works with posns.

Something better could be done, but for now you could add it to the white list.

Jay

On Mon, Oct 31, 2011 at 8:45 PM, Robby Findler
<robby at eecs.northwestern.edu> wrote:
> Oh, I see why. 'color' is bound using define-primitive in order to
> cooperate with the beginner language (and so that 'color' can be a
> constructor). But doing that interferes with the usual information
> bound by a struct that match picks up.
>
> I'm not sure what the right way to resolve this is.
>
> Robby
>
> On Mon, Oct 31, 2011 at 9:39 PM, Robby Findler
> <robby at eecs.northwestern.edu> wrote:
>> Is make-color coming from 2htdp/image? I see that's not working (not
>> sure why yet).
>>
>> Robby
>>
>> On Mon, Oct 31, 2011 at 9:34 PM, Adam Shaw <adamshaw at cs.uchicago.edu> wrote:
>>> Thanks! That still doesn't work for color:
>>>   match: color does not refer to a structure definition
>>> although it does work with my own custom color struct:
>>> (define-struct clr (r g b))
>>> (match (make-clr 1 2 3)
>>>   [(struct clr (r g b)) (* r g b)])
>>>   - Adam
>>> On Oct 31, 2011, at 9:26 PM, Jay McCarthy wrote:
>>>
>>> One of the branches of the pattern language is
>>>
>>> | (struct id (pattern ...))
>>>
>>> Your pattern should be
>>>
>>> (struct color (r g b))
>>>
>>>
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>>
>



-- 
Jay McCarthy <jay at cs.byu.edu>
Assistant Professor / Brigham Young University
http://faculty.cs.byu.edu/~jay

"The glory of God is Intelligence" - D&C 93