Thanks!
On 6 March 2014 01:00, Alexander McLin wrote:
> Daniel, I think it'll be worthwhile to direct your attention to this blog
> entry which goes into more details about why mutable pairs were removed in
> the first place.
>
> http://blog.racket-lang.org/2007/11/getting-rid-of-set-car-and-se
Daniel, I think it'll be worthwhile to direct your attention to this blog
entry which goes into more details about why mutable pairs were removed in
the first place.
http://blog.racket-lang.org/2007/11/getting-rid-of-set-car-and-set-cdr.html
On Wed, Mar 5, 2014 at 4:15 PM, Jens Axel Søgaard wrot
(require compatibility/mlist)
(mlist 1 2 3)
See
http://docs.racket-lang.org/compatibility/mlists.html?q=mlist#%28def._%28%28lib._compatibility%2Fmlist..rkt%29._mlist%29%29
2014-03-05 22:06 GMT+01:00 Daniel Carrera :
>
> On 5 March 2014 19:54, Matthias Felleisen wrote:
>>
>>
>> Okay, now see mco
On 5 March 2014 19:54, Matthias Felleisen wrote:
>
> Okay, now see mcons.
>
Neat... mcons, mcar, mcdr, mpair, set-mcar!, set-mcdr!
I notice that there is no mlist. Is there a shortcut similar to '(1 2 3) to
quote a list in a way that makes mutable pairs instead of regular pairs?
Cheers,
Danie
Okay, now see mcons.
On Mar 5, 2014, at 1:53 PM, Daniel Carrera wrote:
> I see.
>
> k is '(42 2 3) while l is '(1 2 3). This is what I expected to happen, but it
> is clearly not what was supposed to happen. I just tried the same example
> with Chicken, and for Chicken both k and l are equal
I see.
k is '(42 2 3) while l is '(1 2 3). This is what I expected to happen, but
it is clearly not what was supposed to happen. I just tried the same
example with Chicken, and for Chicken both k and l are equal to '(42 2 3).
Thanks for the explanation.
Cheers,
Daniel.
On 5 March 2014 19:24, Ma
But isn't the final effect the same? The pair may be immutable, but I can
make a new pair and bind it to the old variable. The main difference that I
can see is that what I wrote is a macro, while I believe set-car! is
supposed to be a function. That could potentially break code.
Cheers,
Daniel.
Try
(define l (list 1 2 3))
(define k l)
Now what does (set-car! k 42) do? What should it do?
On Mar 5, 2014, at 1:23 PM, Daniel Carrera wrote:
> But isn't the final effect the same? The pair may be immutable, but I can
> make a new pair and bind it to the old variable. The main differen
No, set! mutates variable bindings while set-car! mutates cons cells (the first
slot of a data structure).
On Mar 5, 2014, at 1:13 PM, Daniel Carrera wrote:
> Hello,
>
> My understanding is that Racket intentionally does not provide set-car! and
> set-cdr! and that this is one of the ways i
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