[racket] class variables in racket

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Thu Jan 19 16:58:52 EST 2012

But is this style of OOP thinking because of a weakness in the design
of the OOP that Racket (as it famously inherits from Scheme (ala
Clinger's intro to the RnRS reports)) avoids?


On Thu, Jan 19, 2012 at 1:41 PM, Christian Wagenknecht
<c.wagenknecht at hs-zigr.de> wrote:
> I expected to find some special-form, like 'class-variable' or something
> like that.
> For pedagogical reasons I'd prefer to implement two syntactically different
> programs representing the oop thinking style quite obvious: the first one
> makes absolutely no use of the bindings provided by the 'class' library that
> comes with Racket whereas the second one is mainly limited to take them. The
> first one helps the students to understand lots behind the scene of how oop
> works and why. The second one abstracts of that and really allows for oo
> programming.
> What I mean is that the terms describing the basic concepts of object
> oriented programming should be mapped to related code. Using 'let' to get
> the right variable scope causes to mix both levels of thinking /
> abstraction. Thats exactly what I like to avoid.
> Am 19.01.2012 18:09, schrieb Matthias Felleisen:
>> On Jan 19, 2012, at 11:57 AM, Christian Wagenknecht wrote:
>>> How class variables/methods (instead of instance variables/methods) can
>>> be implemented be means of Racket's class definition expressions? An
>>> unsatisfying way I found is by using a let expression enclosing the whole
>>> definition of the class.
>> What's unsatisfying about it?
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