ior approval. My guess is that when this becomes feasible, it will
happen.
John Clements
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On Jun 23, 2010, at 7:33 AM, Ken Struys wrote:
> Oops forgot the link: http://pandela.com/
FWIW dep't.:
Linode ($20/month) sounds better than this (16 GB, 512 MB ram, etc.).
John Clements
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On Jun 27, 2010, at 6:32 PM, Brad Long wrote:
> Dear racketeers,
>
> What is the reason for not offering a looping construct in racket? For
> example, something like:
>
> (loop (i 1 10) (print i))
>
It's there:
(for/list ([i (in-range 1 10)]) i)
prints out
'(1 2 3 4 5 6 7 8 9)
... also
I'm puzzled by this function:
(serve/dispatch dispatch) → void
dispatch : (request? . -> . response/c)
Calls serve/servlet with appropriate arguments so that every request is handled
by dispatch.
Specifically, it appears that serve/dispatch has the same contract (minus all
the optional args)
On Jun 29, 2010, at 11:39 AM, Jay McCarthy wrote:
> serve/dispatch sets up the servlet-regexp argument of serve/servlet so
> that all URLs go to the dispatch function.
Perhaps I could change the docs to read:
Calls serve/servlet with a 'servlet-regexp' argument so that every request is
handled
g130.imageshack.us/img130/7563/76349361.jpg
First: I'm certainly impressed by the detail of your graphics.
Second: It looks to me like this is an alpha channel issue; specifically, it
looks like the transparency is being handled correctly, but that the pixel
color info is lost.
Can yo
> -- When is it appropriate to use RackUnit, and when should Contracts be used
> instead?
:)
>
> P.S. Has anyone given any thought to consolidating some of the Racket
> discussion to a StackExchange site? Or something else of that i
I wish you could earn Racket badges and levels for completing exercises,
getting +1'ed on the mailing list, and contributing code and documentation.
Just thinking out loud, I'm afraid.
John
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I'd love to find a way to call a sound library's "terminate" function when
Racket shuts down. My recollection of the lay of the land here is that it's
very hard to make this happen correctly without mangling Racket itself. At a
high level, I believe the explanation is that it violates the bound
On Sep 1, 2011, at 8:03 PM, Eli Barzilay wrote:
> Two hours ago, Robby Findler wrote:
>> Does it make sense to have the resource managed by a custodian? That
>> is, operate the ffi/C level where you can extend what happens when a
>> custodian is shutdown to close whatever needs closing or finaliz
On Aug 23, 2011, at 10:15 AM, Neil Van Dyke wrote:
> PLaneT issue I've mentioned this in the past, and it just bit me again...
>
> For production systems that use PLaneT packages, we need a way for an
> application programmer to control the versions of *all* PLaneT packages --
> including the
r (where you downloaded it) and press enter.
> - Follow the instructions.
Also keep in mind that if you want to install it in a public location, you'll
need to have the right privileges. This often involves running the installer
as root, e.g.:
sudo sh
John Clements
>
> Vinc
On Sep 5, 2011, at 12:51 PM, Danny Yoo wrote:
> I got some good feedback, and made some changes!
>
>
> The code that's generating should behave under Firefox now. Please
> try this again:
>
>http://hashcollision.org/whalesong/examples/todo/todo.html
Appears to work for me, 64-bit OS X 10
On Sep 8, 2011, at 8:48 PM, Robby Findler wrote:
> I've changed how online check syntax reports errors. Instead of
> hilighting the source location in gold, it puts a little reddish thing
> in the right-hand margin where the error is. The goal is to make this
> less obtrusive in, say, lecture, bu
On Sep 9, 2011, at 9:20 AM, Robby Findler wrote:
> On Fri, Sep 9, 2011 at 11:05 AM, Vincent St-Amour
> wrote:
>> At Fri, 9 Sep 2011 10:58:23 -0500,
>> Robby Findler wrote:
>>> I thought about that, but I didn't want it to overlap the text and I
>>> didn't want it to slide everything over to mak
It looks to me as though when a custodian-shutdown-all occurs, the custodian
actions associated using scheme_add_managed() can be triggered while another
thread is in the middle of a callback to an FFI-generated callback that
includes the #:atomic declaration. Is this true? If true, is it only
On Sep 9, 2011, at 5:59 PM, Matthew Flatt wrote:
> At Fri, 9 Sep 2011 17:39:38 -0700, John Clements wrote:
>> It looks to me as though when a custodian-shutdown-all occurs, the
>> custodian actions associated using scheme_add_managed() can be
>> triggered while another threa
On Sep 10, 2011, at 12:44 PM, Matthew Flatt wrote:
> At Sat, 10 Sep 2011 12:00:19 -0700, John Clements wrote:
>>
>>
>> However, looking more carefully at the stack trace below, I think I've
>> misread
>> it.
>>
>> This dump came from a
On Sep 16, 2011, at 6:59 AM, Jeremy Kun wrote:
> Oops, meant to reply-all
>
> Jeremy
One other relevant thought; how hard would it be to throw out Apache and just
use setuid to demote racket's privileges after starting? I don't see a built-in
binding for setuid--presumably because it's comple
Jay
>
> On Fri, Sep 16, 2011 at 11:31 AM, John Clements
> wrote:
>>
>> On Sep 16, 2011, at 6:59 AM, Jeremy Kun wrote:
>>
>>> Oops, meant to reply-all
>>>
>>> Jeremy
>>
>> One other relevant thought; how hard would it be to thro
On Sep 16, 2011, at 11:03 AM, Jay McCarthy wrote:
> I think you can use ffi-lib with #f because it is already attached.
Yeah, okay, looks like this works:
#lang racket
(require ffi/unsafe)
;; return type is "gid_t". Safe to use int?
(define setuid
(get-ffi-obj "setuid" (ffi-lib #f)
On Sep 18, 2011, at 9:12 AM, Racket Noob wrote:
> Saying that (quote (1 2 3)) evaluates to (quote (1 2 3)) [instead to (1 2 3)]
> is the same nonsanse to me like saying that (+ 1 2) evaluates to (+ 1 2)
> [instead to 3].
Be careful with words like "nonsense" :).
What does 3 evaluate to?
3
On Sep 18, 2011, at 2:01 PM, Racket Noob wrote:
> Such a cold community. :(
Cold? No way! We're *hot*. That is: we're eager to discuss, and eager to argue.
If anything, we're holding back, to avoid making you angry. Maybe we should
have held back a bit more? I know it can feel a bit lonely w
On Sep 18, 2011, at 10:36 AM, Grant Rettke wrote:
> Hi,
>
> Over the years I've noticed on-list that comments are made about OCaml
> and Haskell and abstract data types.
>
> It seems like it would be fun to learn more about this stuff; and I
> guessed that learning SML would be a nice place to
On Sep 19, 2011, at 1:47 PM, Jeremy Kun wrote:
> Not sure if this is a bug, but it doesn't match the documentation here. It
> says test/exn only succeeds when the error is explicitly raised by the user,
> but I try something as simple as:
>
> "file1.rkt"
> (provide foo)
> (define (foo) (error
> -Eric
>
> On Mon, Sep 19, 2011 at 2:49 PM, John Clements
> wrote:
>>
>> On Sep 19, 2011, at 1:47 PM, Jeremy Kun wrote:
>>
>>> Not sure if this is a bug, but it doesn't match the documentation here. It
>>> says test/exn only succeeds when
On Sep 25, 2011, at 6:21 PM, Sam Tobin-Hochstadt wrote:
> This past week, I wrote some parallel Racket versions of benchmarks
> for the Computer Language Shootout. It was fun to do, and I wrote a
> little bit about what I learned:
> http://scriptstoprograms.wordpress.com/2011/09/25/benchmarketin
small Racket wrapper around the C function that creates the flvector? This
would probably save you 5-10 lines of C and several opportunities for a core
dump, as well. :)
John Clements
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On Sep 30, 2011, at 8:34 AM, Neil Toronto wrote:
> At Eli's suggestion, I'm conducting a poll. Does anybody on this list use the
> 'plot' module, or know of someone who does?
>
> (I'm specifically excluding Doug Williams and his williams/science PLaneT
> package because I already know about th
On Sep 30, 2011, at 10:05 AM, Robby Findler wrote:
> On Fri, Sep 30, 2011 at 12:01 PM, John Clements
> wrote:
>> In my world, a change will fall into the "yes, racket is a rapidly changing
>> language" bin;
>> it's not unusual for much of my old code
On Oct 6, 2011, at 4:48 AM, Robby Findler wrote:
> Do you want async-channel, maybe? If not, then rolling your own
> syncronization pattern via the CML-like primitives is the way to go.
> Once you get used to programming with them, they are very easy to use
> and easy to make thread-safe things (
On Oct 19, 2011, at 6:30 AM, Shriram Krishnamurthi wrote:
> John, have you run your audio stuff w/ world? How hard would that be?
Not hard. In particular, I've isolated the low-level ffi connection in the
"portaudio" planet package, which includes a "push" and a "pull" interface. Eli
suggeste
On Oct 19, 2011, at 9:29 AM, John Clements wrote:
>
> On Oct 19, 2011, at 4:03 AM, Robby Findler wrote:
>
>> (I'm sorry if you got this message already; I thought I sent it
>> already but I don't see it.)
>>
>> What about the current-output/erro
On Oct 19, 2011, at 4:03 AM, Robby Findler wrote:
> (I'm sorry if you got this message already; I thought I sent it
> already but I don't see it.)
>
> What about the current-output/error-port? what about the
> current-namespace? current-custodian?
>
> There are lots of parameters that affect co
On Oct 19, 2011, at 10:26 PM, Paul A. Steckler wrote:
> On Thu, Oct 20, 2011 at 4:21 PM, wrote:
>> 1. sound + universe report: success. (John Clements)
>
> How are you processing the sounds?
>
> It so happens I will be seeing the author of libsndfile this evening.
>
On Oct 20, 2011, at 3:53 AM, Stephen Bloch wrote:
>
> On Oct 20, 2011, at 1:20 AM, John Clements wrote:
>
>> I'm pleased to report that the sound library works pretty transparently with
>> the universe teachpack.
>> ...
>> (define (accelerate
On Oct 20, 2011, at 4:59 AM, Matthias Felleisen wrote:
>
> I think you rather mean the difference between event handlers in Worlds and
> event handlers for Universe Worlds: return a package that may include a sound
> to be played. Sounds depend too much on the exact action you took.
>
> What
On Oct 20, 2011, at 11:42 AM, Matthias Felleisen wrote:
>
> On Oct 20, 2011, at 2:37 PM, John Clements wrote:
>
>> Are you saying that multiple sounds could be occurring at once? This is
>> true, but doesn't strike me as a priori unpleasant.
>
> Yes. S
On Oct 20, 2011, at 6:47 AM, Viera Proulx wrote:
> This is why I think that playing MIDI sounds is the correct model for the
> world.
> On tick we add to the world the sounds that are to be played - they stop
> playing when the next tick starts. (Or, if we control the duration, we
> include th
On Oct 20, 2011, at 3:34 PM, Jay McCarthy wrote:
> FWIW, my sound system does all this.
You know, jay, you have quite a good number of github trees :). Are you
referring to one of them here?
John
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On Oct 21, 2011, at 4:29 AM, Jay McCarthy wrote:
> The one I linked the first time
>
> https://github.com/get-bonus/get-bonus/blob/master/exp/3s.rkt
>
> and an example of its use
>
> https://github.com/get-bonus/get-bonus/blob/master/games/tennis/tennis.rkt
Sorry, missed that.
It looks like
On Oct 21, 2011, at 1:56 PM, Jay McCarthy wrote:
> Not really, but you could overlay one. OpenAL reads the sound from a
> queue and sends you a signal when the queue is getting empty. You
> could catch that and generate more.
>
> Or maybe I don't understand what you mean by pull
Nope, that's it
On Oct 25, 2011, at 11:52 AM, Dan Grossman wrote:
> Hi all,
>
> I'm wondering if there's a concise, informal, mostly complete list of
> R5RSisms that won't work in Racket (#lang racket). As I'm porting
> some old teaching materials to Racket, I've come across:
>
> * Cannot write (if e1 e2); re
On Oct 28, 2011, at 8:12 AM, Joe Marshall wrote:
> On Wed, Oct 26, 2011 at 8:32 PM, Dan Grossman wrote:
>> Very minor point, but is there a rationale beyond historical precedent
>> for + and * to allow any number of arguments but, =, <=, <, >, >= to
>> require at least two arguments?
>
> 0 is t
I've got a bunch of visitors coming in tomorrow for a DrRacket Music demo, and
I'm hoping to have them all use the same account. My experience with this in
the past suggests that there may have been some contention over prefs files;
some machines became unresponsive, and I'm guessing this was th
I've just had a look through the docs, and I don't see an answer to this
question. If I have a place that's blocked on an mzrt-semaphore (not a regular
one, but a full-on-block-an-OS-thread semaphore), will (place-kill ...)
successfully kill the place?
John
P.S.: Obligatory research: I'm thi
On Nov 8, 2011, at 8:17 PM, Prabhakar Ragde wrote:
> I never use the Debug button, but I let my students start using Advanced
> Student today, and of course they tried it out.
>
> The following program induces a strange error when the Debug button is
> pressed.
>
> (match 3
> [`(,x) 3]
> [x
On Nov 14, 2011, at 8:43 AM, Robby Findler wrote:
> Yes, I believe the bug is in that interaction. Sorry I've not had a
> chance to look into it yet.
Let me stick my hand up here: I'm the one who added automatic parens.
Yes, automatic parens don't work with square brackets. This is a symptom of
On Nov 14, 2011, at 2:58 PM, Neil Van Dyke wrote:
> Robby Findler wrote at 11/14/2011 05:45 PM:
>> I've looked through iconfinder.com on more than one occasion for a
>> reasonable check syntax icon, but not found one. Any specific
>> suggestions?
>>
>
> If no one can find a suitable icon off-
On Nov 15, 2011, at 6:22 PM, Tom McNulty wrote:
> Be sure to check out the following doc, there are lots of useful bindings for
> efficient editing.
>
> http://docs.racket-lang.org/drracket/Keyboard_Shortcuts.html?q=keybindings
>
> For printf statements in particular:
>
>> C-c C-l : wraps a
...])]))
I sometimes wish that too... but looking at your mail, the second one is much
easier to read and understand.
John Clements
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On Nov 17, 2011, at 9:12 AM, Alexander Krimm wrote:
>
> PS: is there any way to stop the stepper from continuing to execute the
> programm while you are looking at steps in the beginning of the
> programm? I had an infinite loop in one of my programms and while i was
> trying to figure out why b
On Nov 17, 2011, at 10:10 AM, Matthias Felleisen wrote:
>
> On Nov 17, 2011, at 1:08 PM, John Clements wrote:
>
>>
>> On Nov 17, 2011, at 9:12 AM, Alexander Krimm wrote:
>>
>>>
>>> PS: is there any way to stop the stepper from continuing to exec
On Nov 17, 2011, at 10:35 AM, Matthias Felleisen wrote:
>
> On Nov 17, 2011, at 1:13 PM, John Clements wrote:
>
>> Minor problem: the "end" button.
>
> Disable it until you have found the end or replace it with '1000 steps'
> button
>
>
&
On Nov 17, 2011, at 10:53 AM, Matthias Felleisen wrote:
>
> On Nov 17, 2011, at 1:47 PM, John Clements wrote:
>
>> Suppose you run a big-bang program that puts a dot on the screen every time
>> you press a key. Now suppose it runs for 1K steps and halts. The user sees
e take this off racket-users?
John
>
> Robby
>
> On Thu, Nov 17, 2011 at 12:56 PM, John Clements
> wrote:
>>
>> On Nov 17, 2011, at 10:53 AM, Matthias Felleisen wrote:
>>
>>>
>>> On Nov 17, 2011, at 1:47 PM, John Clements wrote:
>>>
I always wrestle with whether to use channels or asynchronous channels;
specifically, you can model non-blocking 'put' with channels by spawning a
thread that calls 'channel-put'.
Moreover, I have more warm fuzzies associated with regular channels, because
they're part of the CML model.
If I'
Hey! When did this happen? It looks like typed/racket now supports match?
John
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The holiday season: time to grade lots of projects, and "goof off" by thinking
about how those programs could better be expressed.
Here's a world/universe program written by one team in my class. It uses
mutation all over the place:
#lang racket
(require (except-in (planet clements/rsound)
Currently, in typed/racket, if I have a value of type (List Number Number
Symbol String), and I apply 'fourth' to it, I get (U Number Symbol String)
rather than String.[*]
It looks to me like this is a "didn't get around to it yet" issue, but perhaps
I'm missing some vital difference between '
On Dec 12, 2011, at 7:55 PM, Matthias Felleisen wrote:
>
> Is the below really much less natural to write? I really enjoyed playing the
> qwerty row from left to right, or perhaps I was pressing the number keys at
> the same time :-)
You're cheating! Unless quasiquote is a new part of htdp/2e
On Dec 14, 2011, at 6:15 AM, Matthias Felleisen wrote:
>
> CPS is for old people. Be careful.
>
> See Dybvig's paper on measurable benefits (or lack thereof) for values and
> friends.
You're referring to 1994, "An efficient implementation of multiple return
values in Scheme" ?
John
smi
On Dec 19, 2011, at 5:02 PM, Racket Noob wrote:
> Jordan, beautiful are your ideas and suggestions, but unfortunately, I think
> that they are futile. Why do I say this? I think that Racket primarily serves
> to a specific group of people as an inexhaustible source for mass-production
> of alw
This program
#lang typed/racket
(: seq (Sequenceof Byte))
(define seq (in-range 127))
...yields this error:
Type Checker: Expected (Sequenceof Byte), but got (Sequenceof
Nonnegative-Fixnum) in: (define seq (in-range 127))
I'm wondering if there's a way to get (in-range 127) to type-check at
versions of the game, the GitHub page is still in active
> development, the submitted version is available as the ldjam branch).
>
> Anyway, I just thought some of you might think this was cool, so I hope you
> take a look!
Very cool!
Much appreciate
On Dec 26, 2011, at 2:46 AM, Dmitry Pavlov wrote:
> Hello,
>
> I would like to make read-byte and friends to
> throw an exception in case end of file is
> reached. That is, when I call read-byte,
> I know that the byte must be there, otherwise
> the input data is corrupt. I would prefer
> not to
On Dec 24, 2011, at 3:43 AM, Răzvan Rotaru wrote:
> Hi,
>
> I stumbled upon a compilation in parameter.plt:
>
> .
> ../../../../.racket/planet/300/5.1.3/cache/dherman/parameter.plt/1/3/main.ss:26:17:
> compile: unbound identifier in module in: flat-get
>
> The broken code is following:
> ;;
On Jan 3, 2012, at 3:09 PM, Neil Van Dyke wrote:
> I don't know what the *stock* XML parsing does, but I have used Oleg
> Kiselyov's SSAX parser a lot in Racket-based production apps, and it does
> handle CDATA.
>
> Oleg spent a lot of time on XML, including learning things about it that its
On Jan 2, 2012, at 6:40 PM, Patrick Li wrote:
> Hello everyone,
>
> I am trying to accomplish the following task, and was wondering if anyone
> knows of a fitting paper that I can read. I want to write a static analysis
> tool for a small scheme-like language to catch simple typing errors. The
Has anyone taken a look at generating ePub or mobi documents directly from
scribble?
As the owner of a Kindle, I can see that pdf/dvi/ps is terrible for these kind
of on-the-fly reformatting systems. HTML is better, but trying to convert the
existing HTML for HtDP 2e (I haven't tried removing t
I just had trouble with the type of log; I wanted to pass it a positive real,
and get back a Real. After inspecting the type, I see that it works for
Positive-Float. Is this deliberate, in order to get more optimizable code (if
the input is a float, we don't need to check it), or just an overs
It appears that TR only prints the message "[Use (:print-type ) to see
more.]" once. I think this is the wrong choice, and that it should be printed
every time.
Totally unimportant, I know.
Thanks!
John Clements
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I wrote a piece of code like this without thinking:
#lang typed/racket
(: f (All (T) (Number -> T -> T)))
(define ((f x) y)
(ann y T))
... and then, after a second, was sort of flabbergasted that it worked. What's
the scope of the type variable T? Apparently I can use it anywhere in the
def
I'd like a predicate that checks whether a number is a Float. Here's what I
tried:
(: amplitudes/t (Listof Float))
(define amplitudes/t
(cond [(andmap inexact-real? amplitudes)
amplitudes]
[(error 'impossible "Make TR happy")]))
But
On Jan 5, 2012, at 5:30 PM, Sam Tobin-Hochstadt wrote:
> On Fri, Jan 6, 2012 at 1:00 AM, John Clements
> wrote:
>>
>> Examining the difference between Inexact-Real and Float yields this:
>>
>>> (:type Float)
>> (U Float-Positive-Zero Float-Negative-Zer
On Jan 6, 2012, at 8:39 AM, John Clements wrote:
>
> On Jan 5, 2012, at 5:30 PM, Sam Tobin-Hochstadt wrote:
>
>> On Fri, Jan 6, 2012 at 1:00 AM, John Clements
>> wrote:
>>>
>>> Examining the difference between Inexact-Real and Float yields this:
>&g
On my mac, the window summoned by a double-click after running Performance
Report has no close box, and no close buttons, and no obvious way to dismiss
it. It turns out that choosing "Racket > Quit" from the menu gets rid of it,
but on a Mac, this is *severely* unintuitive, as it appears that y
I'm guessing this is a contract issue, but it looks to me like calls from
racket into typed/racket are slow. To wit:
#lang racket/load
(module a typed/racket
(provide float-add)
(: float-add (Float Float -> Float))
(define (float-add a b) (+ a b))
(printf "a million in-module typed adds\n")
(
On Jan 6, 2012, at 9:19 AM, Vincent St-Amour wrote:
> At Fri, 6 Jan 2012 08:47:39 -0800,
> John Clements wrote:
>> 1) Not all of the types printed in (:print-type Foo) are necessarily
>> bound in the user code, right? I tried at one point substituting the
>> result of (
be the focus of the kind
of guide you're looking for?
John Clements
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On Jan 5, 2012, at 5:32 PM, Sam Tobin-Hochstadt wrote:
> On Thu, Jan 5, 2012 at 11:56 PM, John Clements
> wrote:
>> I wrote a piece of code like this without thinking:
>>
>> #lang typed/racket
>>
>> (: f (All (T) (Number -> T -> T)))
>> (def
Many people have better things to do than worry about our rank in the TIOBE
programming languages index. For who care, then: we currently have "About 3,180
results (0.17 seconds)" for +"Racket Programming" on Google. 50K puts us in the
top 50, something like 15-20K puts us in the top 100.
John
Related note: there's a new book out about Racket!
Uh, more or less
http://www.amazon.com/gp/product/1244213063/ref=cm_cr_mts_prod_img
John
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On Jan 6, 2012, at 1:37 PM, Vincent St-Amour wrote:
> At Fri, 6 Jan 2012 13:15:54 -0800,
> John Clements wrote:
>> Welcome to DrRacket, version 5.2.0.7--2012-01-05(fd5e40f/g) [3m].
>> Language: racket/load; memory limit: 256 MB.
>> a million in-module typed adds
>>
For wikipedia, Is rackunit an XUnit? I said yes. Change if necessary:
http://en.wikipedia.org/wiki/List_of_unit_testing_frameworks#Racket
John Clements
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wever, it's not *all* parameters that
trigger the error; I can submit code containing (current-error-port) without
incident. I've taken a quick look at the code, and I can't see how setting this
parameter would trigger a call to current-directory.
Any ideas?
John Clements
smime.p7
On Jan 14, 2012, at 8:19 PM, Robby Findler wrote:
> Perhaps the right thing is to have the setup code export a small
> library that contains a "is my mark bound in the context" function and
> then the sandbox can call that function when deciding whether or not
> to grant permission.
>
> (That ha
I think the below would make a good PLT blog post, perhaps with an opening
paragraph about how much cheaper the stateless web-server can be.
John
On Jan 3, 2012, at 10:33 PM, Galler wrote:
>
>
> On the subject of porting #lang racket to #lang web-server code
>
> I provide a few lessons le
Scribble tipped the balance for me; I now find myself using DrRacket to edit
text files.
As part of a quest for world domina^H^H^H^H^H^Hcompatibility, I'd like to add
either
#lang text
or
#lang none
which could begin a text file and indicate that no highlighting should be done,
and that e
On Jan 19, 2012, at 12:17 PM, Tony Garnock-Jones wrote:
> On 01/19/2012 02:52 PM, John Clements wrote:
>> #lang text
>
> How about #lang text/plain ? (Leaving the way open for #lang text/xml and so
> forth) (#lang application/octet-stream !)
Yes, much nicer.
John
smime.
On Jan 19, 2012, at 1:51 PM, Ryan Culpepper wrote:
> The Racket class system doesn't have such a thing because it doesn't need it.
> The idiomatic Racket alternative to "class variables" or "static members" is
> to define the variable/constant/function at the top-level of the enclosing
> modul
On Jan 20, 2012, at 8:48 AM, Eli Barzilay wrote:
> Yesterday, John Clements wrote:
>> Scribble tipped the balance for me; I now find myself using DrRacket
>> to edit text files.
>>
>> As part of a quest for world domina^H^H^H^H^H^Hcompatibility, I'd
>>
I want to write this piece of code:
(: only-non-false (All (T) ((Listof (U T False)) -> (Listof T
(define (only-non-false l)
(filter (ann (lambda (x) x)
((U T False) -> Any : T))
l))
... but Typed Racket says:
Type Checker: Expected result with filter ((T @ x) | (!
I'm finding it difficult to construct filters for given types:
#lang typed/racket
(define-type GradeElement
(Pair Bytes Null))
(: grade-element? (Any -> Boolean : GradeElement))
(define (grade-element? a)
(and (pair? a)
(bytes? (car a))
(null? (cdr a
=>
Type Checker: Exp
On Jan 30, 2012, at 12:53 PM, Sam Tobin-Hochstadt wrote:
> On Mon, Jan 30, 2012 at 3:37 PM, Sam Tobin-Hochstadt
> wrote:
>> On Mon, Jan 30, 2012 at 3:22 PM, John Clements
>> wrote:
>>> Am I missing something obvious in either of these?
>>
>> No. Typ
On Jan 30, 2012, at 1:14 PM, Matthias Felleisen wrote:
>
> On Jan 30, 2012, at 4:11 PM, Sam Tobin-Hochstadt wrote:
>
>> Perhaps it should just have less information.
>
>
> I like that a lot.
I'm not sure I do; if I were on a desert island or had just kicked Sam in the
shin yesterday, I'd p
On Jan 24, 2012, at 7:05 PM, Michael W wrote:
>
> P.S. Yes, I know (planet clements/rsound) is better, but I wanted
> to practice with something a bit lower level. Plus, it's nice to
> be able to stream raw sound data from a port instead of loading
> it all into memory. ;) I don't mean to step on
I'm working with Dave Herman's JavaScript package. I've found a problem and a
workaround, but I want to make sure there's not an easier workaround before I
convert a bunch of code. The following program illustrates the issue:
#lang racket/load
(module a racket
;; this formulation "works"
ssfully replaced all of the funny text
quotes with regular ASCII ones, but I gave up when I noticed that apparently
less-than signs were interpreted as HTML tag markers--it'll be easier just to
ask for a non-damaged copy to be attached to the page somehow.
John Clements
smime.p7s
Descr
My students have terrible trouble with handin tests that don't terminate /
exhaust memory. Specifically, the handin fails, and no test results are saved
with the file in a SUCCESS directory.
I think the underlying problem is that I'm using (add-header-line! ...) to
record information about test
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