I seem to be missing some key ingredient here. The following really simply
test-case, using let-syntaxes, works as expected:
> (define-syntax my-def-stx
> (lambda (stx)
> (syntax-case stx (my-def-stx)
> [(my-def-stx (id ...) rhs expr)
>#'(let-syntaxes ([(id ...) rhs]) expr)])))
Probably you don't want to work with namespaces, which are intended more for
run-time reflection.
For an example of turning internal definitions into 'letrec-syntaxes+values',
try the implementation of 'racket/block'.
> On Jun 23, 2015, at 10:06 AM, Thomas Dickerson
> wrote:
>
> Update / add
Update / addendum: I was also able to fairly trivially extend Alex's code using
let-syntax to have the more hygienic behavior for where Accum is/is-not
visible, but let-syntax ends up leaving an additional layer of empty
(let-values() ...) behind.
The documentation for let-syntax makes the foll
The docs here might help elaborate on Matthias's answer:
http://docs.racket-lang.org/gui/canvas___.html
I'll try adding more links to that information, including from the
`get-dc` method. Maybe it also would be better as its own section in
the overview chapter.
At Mon, 22 Jun 2015 18:07:04 -04
[[ I am tempted to say that you misplaced the parentheses and brackets and
broke lines at the wrong place. ]]
Here is a re-ordering of the first "don't work" variant that kind of works:
#lang racket
(require slideshow racket/class racket/gui/base)
(define my-frame
(new frame%
[label
Thanks for the effort that went into figuring that out! A couple first thoughts
on the implementation:
To first order, this is exactly what I want to be able to do (and it elegantly
avoids local-expand by reasoning about expansion order); however, as a general
pattern, it's a bit unhygienic in t
Hi Luke,
With 5000 numbers I got the numbers below with a slightly modified
benchmark.
If one method generates garbage and triggers a garbage collection while
running the following method, then the numbers will be unfair. To avoid
this I call collect-garbage before calling time.
map-once method n
Hi people,
I am wondering why this segment of code failed to work:
; don't work
#lang racket
(require slideshow racket/class racket/gui/base)
(define my-frame (new frame% [label "my frame"]
[width 300] [height 300]
[alignment '(center ce
About six months ago, I had an idea on how to generate passwords from English
text while still maintaining entropy. I wrote it up quickly on ArXiv, and
published a web page where you can try it:
http://www.brinckerhoff.org/molis-hai/
I’ve now released it as a raco command-line tool, too. You ca
Hi,
This is Aanchal from Technology resource Group. Below is the job
description and requirements for your perusal and please contact me if
having any questions or concerns.
*OPENINGS: 2*
*Role: Sr. Oracle Functional Consultant*
*Location: Billerica, MA*
*Duration: 6 Months (Extension possi
Sorry for the lame subject; that was the draft subject and I forgot to changing
it before posting.
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TLDR; How to store use HTTP cookies across multiple requests in an HTTP client?
I'm trying to fetch a URL and, say, print the cookies it sets.
Fetching a URL is easily done with `call/input-url`, however it doesn't handle
HTTP response headers (incl. cookies).
There are `http-conn-open`, `ht
On Jun 22, 2015, at 11:31 AM, Jens Axel Søgaard wrote:
> John Carmack:
> My son's game has a level editor as well as a game loop, and we switch
> between them. However, each new big-bang call creates a new window, leaving
> the previous ones inert on the screen. How can we close the windows
Yes, sorry about that everyone. Poor planning on my part.
Robby
On Monday, June 22, 2015, Neil Toronto wrote:
> Robby has just pushed an evil hack that makes plots and pict3ds
> interactive again.
>
> In the future, there will be a transition to a different "interactive
> values" API, but it'll
Robby has just pushed an evil hack that makes plots and pict3ds
interactive again.
In the future, there will be a transition to a different "interactive
values" API, but it'll go a lot smoother.
Neil ⊥
On 06/21/2015 12:34 PM, Neil Toronto wrote:
It's because of this:
https://groups.google.
On Monday, 22 June 2015 16:46:39 UTC+4:30, Daniel Prager wrote:
> (apply ~a
> (map (λ (x) (apply format "[~a=~a]" x)) paired-list))
I like it! I had totally forgotten about `apply`.
> BTW: In DrRacket you can get the λ by using Cmd+\ (on Mac, shortcut listed in
> the Insert file menu).
T
At Thu, 21 May 2015 07:15:14 -0600, Matthew Flatt wrote:
> Otherwise, be prepared for me to come back in a few
> weeks and lobby for moving to a new macro expander.
Here's the proposal: let's switch on July 16. "Switch" means that I'd
merge the new macro expander to the master branch of the develo
I reckon, rather than using match or first & second
(apply ~a
(map (λ (x) (apply format "[~a=~a]" x)) paired-list))
is quite neat.
BTW: In DrRacket you can get the λ by using Cmd+\ (on Mac, shortcut listed
in the Insert file menu).
Dan
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On Mon, Jun 22, 2015 at 2:43 AM, Aidan Gauland wrote:
>> If this does what you want, it’s fine, but the define/contract is probably
>> unnecessary, and
>> (define fish-freshness/c
>> (flat-named-contract ‘fish-freshness/c
>> (lambda (x)
>> (not (eq? ….)
>> Should do what you want.
On Sun, Jun 21, 2015 at 10:18 PM, Neil Toronto wrote:
> On 06/21/2015 02:54 PM, Alexis King wrote:
>>>
>>> I guess I could add a close-on-stop clauses for programmers
>>> such as your son but it sounds almost like he's ready to move
>>> on to racket proper, as in use the Windowing API directly.
>>
On Monday, 22 June 2015 02:34:43 UTC+4:30, Bahman Movaqar wrote:
> Assuming
>
> (define my-list ("a" 1 "b" 2.5 "c" #t "d" "hi"))
>
> what is the idiomatic way to convert `my-list` into the following?
>
> "[a=1][b=2.5][c=#t][d=hi]"
Thank you Jon, Robby and Matthias for the help.
The
On 22/06/2015 11:05, George Neuner wrote:
Hi all,
I have what I hope is a quick question. WIth appropriate care to pair
start and commit/rollback, is it safe to use call-with-transaction
and start-transaction together?
e.g.,
(call-with-transaction dbc
(lambda ()
:
(st
Hi all,
I have what I hope is a quick question. WIth appropriate care to pair
start and commit/rollback, is it safe to use call-with-transaction and
start-transaction together?
e.g.,
(call-with-transaction dbc
(lambda ()
:
(start-transaction dbc #:isolation 'serializab
On 22/06/15 04:26, Alexander D. Knauth wrote:
>
> On Jun 21, 2015, at 5:41 AM, Aidan Gauland wrote:
>
>> Say I want to define a flat contract for the "freshness" field of my
>> fish class, so I define a contract for it like so:
>>
>> (define/contract fish-freshness/c
>> (-> any/c
>> boolean
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