On Tuesday, August 18, 2015 at 1:24:38 AM UTC-4, Alex Knauth wrote:
> On Aug 18, 2015, at 1:18 AM, Brian Adkins wrote:
>
> > On Tuesday, August 18, 2015 at 1:13:16 AM UTC-4, Alex Knauth wrote:
> >> Is == what you're looking for?
> >> Or do you want a version of == that uses string=? ?
> >
> > I'
On Aug 18, 2015, at 1:18 AM, Brian Adkins wrote:
> On Tuesday, August 18, 2015 at 1:13:16 AM UTC-4, Alex Knauth wrote:
>> Is == what you're looking for?
>> Or do you want a version of == that uses string=? ?
>
> I'm not sure what you're suggesting. I basically want a way to inject the
> value
Very helpful, thank you. You're right that the #:methods spec was messing
up the original macro, too. Though it had some other problems after I got
beyond that hurdle.
Every time I think I am starting to understand macros I find out I don't.
Deren
On Tue, Aug 18, 2015 at 12:43 AM, Alexander D. K
On Tuesday, August 18, 2015 at 1:13:16 AM UTC-4, Alex Knauth wrote:
> Is == what you're looking for?
> Or do you want a version of == that uses string=? ?
I'm not sure what you're suggesting. I basically want a way to inject the value
of x into the pattern vs. using a literal such as "abc" since
Is == what you're looking for?
Or do you want a version of == that uses string=? ?
On Aug 18, 2015, at 12:55 AM, Brian Adkins wrote:
> Consider the following:
>
> (define x "abc")
> (match '(1 "abc")
> [ (list 1 y) #:when (string=? y x) #t ]
> [ _ #f ])
>
> Is there a way to accomplish the s
Consider the following:
(define x "abc")
(match '(1 "abc")
[ (list 1 y) #:when (string=? y x) #t ]
[ _ #f ])
Is there a way to accomplish the same thing more concisely by interpolating the
value of x into the pattern? For example (non-working syntax):
(define x "abc")
(match '(1 "abc")
[
Hi, folks. I'd like to implement an LPMUD-like multi-user programmable
environment in Racket. The idea is that an "object" would be a module plus
some state, similar to a gen_server in Erlang. Objects would each live in
their own sandbox and communicate with one another via message passing,
probabl
I'm not sure why that doesn't work, but I redid it with my define-struct-fields
macro factored out and this worked:
I'm not sure but I suspect the real difference comes from passing gen:printable
to the pstruct macro though, because that's what causes this to fail.
I also had to add the optional
Thanks for your help Alexander. I did have this much working alright in a
different manner. What I guess I wanted was that this syntax was introduced
per struct so that the same syntax worked for all interface-structs. That
is, if I
(interface-struct test (a b c)
[(define (some-interface-function
Are you looking for a macro like this:
#lang racket
(require syntax/parse/define (for-syntax racket/syntax))
(define-simple-macro (define-struct-fields struct:id (field:id ...) v:expr)
#:with s (generate-temporary #'struct)
#:with [struct-field ...]
(for/list ([field (in-list (syntax->list #'
Suppose I have a struct which implements a generic interface. I'll copy and
paste the interface from the guide for the example. What I'd like to do is
have automatically-introduced syntax which allows you to skip a lot of the
struct-accessor forms. So for instance, for a struct like
(struct test (a
Thank you, Jay. I'll try it.
2015年8月17日月曜日 23時45分07秒 UTC+9 Jay McCarthy:
> There's nothing experimental or especially teaching oriented in the
> API. It is as useful as PHP and Python's. I personally think it is
> more useful because of some special Racket-y things it does, but I'm
> obviously bia
In that case is it possible to have a version for HEAD, or at least the
latest nightlies, as those version numbers tend to change quite rapidly?
~Leif Andersen
On Mon, Aug 17, 2015 at 10:47 AM, Jay McCarthy
wrote:
> This is not currently a feature.
>
> Jay
>
> On Sun, Aug 16, 2015 at 11:09 AM,
Jack Firth wrote on 08/17/2015 03:21 PM:
From my limited experience with C, I've learned it's pretty much
impossible to expect any sane human to keep track of memory perfectly.
That's a helpful impression. C must be feared and respected, before it
can be tamed.
That said, I think it's feasi
On Monday, August 17, 2015 at 9:07:15 AM UTC-7, Matthew Flatt wrote:
> That's an especially basic mistake, and it slipped by because low-level
> locks are rarely allocated in the run-time system. Place channels are
> probably the simplest way to trigger new locks, but the test that
> checks for lea
Thank you Matthew.
On 17/08/15 17:07, Matthew Flatt wrote:
> That's an especially basic mistake, and it slipped by because low-level
> locks are rarely allocated in the run-time system. Place channels are
> probably the simplest way to trigger new locks, but the test that
> checks for leaks with p
The problem is in the clean-up of OS-level locks. A lock is allocated
using a combination of malloc() and pthread_mutex_init(), for example.
The clean up was usually missing the free() to go along with
pthread_mutex_destroy().
That's an especially basic mistake, and it slipped by because low-level
It sounds like you are on the right track. If you need help and can
provide a test case, then I'd be able to be more useful. I think the
function you're going to want to get out is something like:
http-conn-tunnel/ssl : http-conn [arguments to ports->ssl-ports] -> http-conn
where the input port i
I'm looking into this. I can confirm that the GC thinks there's no
leak, but the OS thinks there is.
Thanks for the example and info!
At Mon, 17 Aug 2015 16:09:00 +0100, Tim Brown wrote:
> Sam,
>
> I don’t see the leak with (display (current-memory-use)) -- sorry for
> leaving it in the example,
Sam,
I don’t see the leak with (display (current-memory-use)) -- sorry for
leaving it in the example, it’s misleading since your numbers behave
like mine did when I used that function.
I *do*, however, see the leak on my gnome-system-monitor; which looks
like something that’s invisible to the GC
This is not currently a feature.
Jay
On Sun, Aug 16, 2015 at 11:09 AM, Alexander D. Knauth
wrote:
> Is there a way to create a version exception for a range of versions, instead
> of for a single version?
>
> --
> You received this message because you are subscribed to the Google Groups
> "Rac
There's nothing experimental or especially teaching oriented in the
API. It is as useful as PHP and Python's. I personally think it is
more useful because of some special Racket-y things it does, but I'm
obviously biased.
Jay
On Mon, Aug 17, 2015 at 3:41 AM, wrote:
> Hi,
>
> I want to build my
On 17/08/15 15:15, Tim Brown wrote:
> To explain my need of insane numbers of places, I [...]
I mean place-channels, the population of places is fixed.
--
Tim Brown CEng MBCS
City Computing Limited · www.ci
Great! Thank you!
Best,
Marduk
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On 17/08/15 15:02, Tim Brown wrote:
> I am observing a memory leak with place-channels. I have long-lived (or
> very busy server “places” ) which I think are exhausting VM memory and
> causing spectacular failures -- core dumps, spins and other fun I came
> to Racket to avoid. Please could someone
Folks,
I am observing a memory leak with place-channels. I have long-lived (or
very busy server “places”) which I think are exhausting VM memory and
causing spectacular failures -- core dumps, spins and other fun I came
to Racket to avoid. Please could someone more familiar with the code
take a lo
On Sun, Aug 16, 2015 at 6:40 AM, Marduk Bolaños wrote:
> Coming back to my original question. What is your advice for using
> Racket's draw and plot in other programs?
>
Hi, Marduk.
There was a discussion that is close to your purpose.
http://lists.racket-lang.org/users/archive//2014-January/061
Hi,
I want to build my web server in internet and make a simple blog page. Is the
racket's web server API useful as php or python, or experimental or for
teaching?
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