Hi, and sorry for the delay. I've pushed a fix for this, altho it is more like a new feature since the code below still doesn't work--- you have to explicitly name the struct that had the field when it isn't the first argument to struct-copy.
Robby On Fri, Mar 25, 2011 at 7:52 AM, Pierpaolo Bernardi <[email protected]> wrote: > On Wed, Mar 23, 2011 at 00:49, Nadeem Abdul Hamid <[email protected]> wrote: >> Is there anything like struct-copy that works to functionally update a >> field value in a structure, where the field happens to be defined in >> the super-type? In the example below, I want to "functionally update" >> a field of the sub structure inherited from the base definition... >> >> >> (struct base (a b) #:transparent) >> (struct sub base (c) #:transparent) >> >> (define S (sub 1 2 3)) >> >> (struct-copy sub S [c 4]) ; works >> ; doesn't work: (struct-copy sub S [b 4]) >> (struct-copy base S [b 4]) ; produces a base, not sub > > No answers? > > it looks to me that > > (struct-copy sub S [b 4]) > > should work, but it doesn't. Isn't this a bug? > > If it is not considered a bug, maybe the docs need a clarification? > > Cheers > P. > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
