i've understood, big thanks for your help !
have a nice day,
-mw
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On 10/22/10 5:38 PM, scouic wrote:
I thought invalid-xexpr?was necessarily a boolean returning # t or # f ...
thank you very much for your explanation David
exn:invalid-xexpr? is a predicate: it's a function that can be applied
to any value and it will return either #t or #f. It returns #t on
I thought invalid-xexpr? was necessarily a boolean returning # t or # f ...
thank you very much for your explanation David
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On 10/22/10 5:12 PM, scouic wrote:
Hi,
i learn with-handlers mechanism, and i don't understand what's wrong in
this piece of code ?
#lang racket
(require xml)
(define a-good-string "hi there!")
(define a-bad-string "hi there!")
(define (panoramix s)
(with-handlers ((exn:invalid-xexpr? (lamb
Hi,
i learn with-handlers mechanism, and i don't understand what's wrong in this
piece of code ?
#lang racket
(require xml)
(define a-good-string "hi there!")
(define a-bad-string "hi there!")
(define (panoramix s)
(with-handlers ((exn:invalid-xexpr? (lambda (e) 'UFO)))
(string->xexpr s)))
This is a shortcoming in the current 2htdp/image. It is on my list.
Robby
On Friday, October 22, 2010, Todd O'Bryan wrote:
> I should mention, this is using the latest nightly build and I got the
> error when I did
>
> (read-assignment-file "/path/to/valid/racket/file.rkt")
>
> Todd
>
> On Fri,
I should mention, this is using the latest nightly build and I got the
error when I did
(read-assignment-file "/path/to/valid/racket/file.rkt")
Todd
On Fri, Oct 22, 2010 at 10:57 AM, Todd O'Bryan wrote:
> I'm trying to read a student program (which might include images or
> not) as text, just s
>> Racket is call-by-value. Period. Always. -- Matthias
On Thu, Oct 21, 2010 at 6:38 PM, Shriram Krishnamurthi
wrote:
> There is a variation on what Matthias said, which is when you need a
> shared structure whose value changes but whose representation may
> contain immutable constants.
I disag
On Fri, Oct 22, 2010 at 5:09 AM, Shriram Krishnamurthi
wrote:
> There is no STM in Racket, so I don't see the relation. In a
> transactional world, you need to know what "that" means. In Racket,
> there's no cleverness.
>
> The refs in Clojure may be more akin to the boxes in FrTime.
ah! thank
Matthew, hello.
On 2010 Oct 22, at 14:45, Matthew Flatt wrote:
> `raco exe' doesn't use the system linker (in the sense of `ld') at all.
> It clones an existing binary and then adds an extra load command by
> manipulating the Mach-O format directly. Flags added by `++exf',
> meanwhile, are flags
I'm trying to read a student program (which might include images or
not) as text, just so I can look at it.
I tried this:
#lang racket
(require wxme)
(define/contract (read-assignment-file path)
(-> (or/c string? path-string?) bytes?)
(let* ([the-path (if (path-string? path)
CALL FOR WORKSHOP AND CO-LOCATED EVENT PROPOSALS
ICFP 2011
16th ACM SIGPLAN International Conference on Functional Programming
September 19 - 21, 2011
Tokyo, Japan
http://www.icfpconference.org/i
`raco exe' doesn't use the system linker (in the sense of `ld') at all.
It clones an existing binary and then adds an extra load command by
manipulating the Mach-O format directly. Flags added by `++exf',
meanwhile, are flags to the embedded `racket' or `gracket' in the
executable.
I'm not sure ho
There is no STM in Racket, so I don't see the relation. In a
transactional world, you need to know what "that" means. In Racket,
there's no cleverness.
The refs in Clojure may be more akin to the boxes in FrTime.
Shriram
On Fri, Oct 22, 2010 at 3:47 AM, Raoul Duke wrote:
> On Thu, Oct 21, 201
On Thu, Oct 21, 2010 at 6:38 PM, Shriram Krishnamurthi
wrote:
> There is a variation on what Matthias said, which is when you need a
> shared structure whose value changes but whose representation may
> contain immutable constants.
akin to http://clojure.org/refs ?
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