Re: [racket] A primitive more fundamental than a continuation?

2012-12-02 Thread Jan Burse
Galler schrieb: 'Racket could implement mutable continuations, but has not' I was just thinking whether mutable continuations can be used for some JIT-ing. Had already a question about call-site code replacement here. And there some response was to use set! on a symbol. But using set-car! looks

Re: [racket] A primitive more fundamental than a continuation?

2012-12-02 Thread Prabhakar Ragde
Matthias wrote: The documentation (See Guide s10.3) says "A continuation is a value that encapsulates a piece of an expression context" Someone should submit a doc bug report to the Guile people. The 'expression' should be replaced (or supplemented) with 'evaluation'. Not "Guile", "Guide". T

[racket] Screenshot in OS X

2012-12-02 Thread Jens Axel Søgaard
Hi All, From time to time the topic of screenshots pop up. Being able to take screenshots from within (Dr)Racket could be used for multiple purposes: * bug reports * StackOverflow posts * scripting the images of GUI elements in the docs Being on OS X have written some code that works for m

Re: [racket] Matching patterns of two function

2012-12-02 Thread Mohammad Mustaqeem
Thanks a lot. But I want to test equality of two functions by comparing their call-graphs. If you know, plz tell me? How to construct call-graph of functions. Racket Users list: http://lists.racket-lang.org/users

[racket] How to write a unit test for syntax-parse expectation failure error message?

2012-12-02 Thread Greg Hendershott
I'd like to write a unit test that a syntax-parse expectation failure elicits a certain error message. For instance, I'd do a regexp-match? that "something" is present in a message like "expected something". However it seems that syntax-parse expectation failures don't raise an exception. In other

Re: [racket] A primitive more fundamental than a continuation?

2012-12-02 Thread Matthias Felleisen
On Dec 2, 2012, at 1:42 AM, Galler wrote: > Racket also provides operations for inspecting continuations, for example > (continuation-marks k) returns the set of marks associated with k. (see Ref. > s9.5). Those are somewhat orthogonal to the opaqueness of continuations but yes, I wrote "Imagin

Re: [racket] How to write a unit test for syntax-parse expectation failure error message?

2012-12-02 Thread Ryan Culpepper
On 12/02/2012 12:14 PM, Greg Hendershott wrote: I'd like to write a unit test that a syntax-parse expectation failure elicits a certain error message. For instance, I'd do a regexp-match? that "something" is present in a message like "expected something". However it seems that syntax-parse expec

Re: [racket] Matching patterns of two function

2012-12-02 Thread J. Ian Johnson
What you're asking for is a control flow analysis. I think you might be approaching whatever problem you're having the wrong way. -Ian - Original Message - From: Mohammad Mustaqeem To: users@racket-lang.org Sent: Sun, 2 Dec 2012 11:56:48 -0500 (EST) Subject: Re: [racket] Matching patterns

Re: [racket] A primitive more fundamental than a continuation?

2012-12-02 Thread Hendrik Boom
On Sun, Dec 02, 2012 at 09:29:34AM -0500, Prabhakar Ragde wrote: > Matthias wrote: > > >>The documentation (See Guide s10.3) says "A continuation is a value > >>that encapsulates a piece of an expression context" > > > >Someone should submit a doc bug report to the Guile people. The > >'expression

Re: [racket] A primitive more fundamental than a continuation?

2012-12-02 Thread Matthias Felleisen
The phrase 'evaluation context' has been in the literature since 1986 for just this purpose. I know, I coined it. On Dec 2, 2012, at 2:25 PM, Hendrik Boom wrote: > On Sun, Dec 02, 2012 at 09:29:34AM -0500, Prabhakar Ragde wrote: >> Matthias wrote: >> The documentation (See Guide s10.

Re: [racket] How to write a unit test for syntax-parse expectation failure error message?

2012-12-02 Thread Greg Hendershott
Perfect -- thank you! On Sun, Dec 2, 2012 at 1:34 PM, Ryan Culpepper wrote: > On 12/02/2012 12:14 PM, Greg Hendershott wrote: >> >> I'd like to write a unit test that a syntax-parse expectation failure >> elicits a certain error message. For instance, I'd do a regexp-match? >> that "something" is

[racket] FFI: Giving a double pointer to a function

2012-12-02 Thread Vince Kuyatt
So I recently started to poke at my humble little bindings to the Chipmunk library again. (someone sent me an email asking for help, which reminded me that I hadn't worked on it in a while) The problem is that I'm still stumbling over the same block that made me stop in the first place a number of

Re: [racket] FFI: Giving a double pointer to a function

2012-12-02 Thread Ryan Culpepper
Based on the documentation I found and the CP_ARBITER_GET_SHAPES macro, it looks like the double-pointer arguments are just used for multiple outputs. So you should use the following type for the function: (_fun _cpArbiter-pointer (out1 : (_ptr o _cpShape-pointer)) (out2 : (_ptr o _

Re: [racket] A primitive more fundamental than a continuation?

2012-12-02 Thread Galler
> The phrase 'evaluation context' has been in the literature since 1986 for just this purpose. I know, I coined it. > I wonder if there's been terminology drift in the reference For example: In the documentation, 'expression context' appears and is defined (Ref. 1.2.3.3) 'continuation frame'

Re: [racket] FFI: Giving a double pointer to a function

2012-12-02 Thread Vince Kuyatt
Stepping through the program when debugging, it (the Racket runtime) now crashes when running (cpArbiterGetShapes arb) with the modifications you suggested. (also I just pushed the changes to the GitHub repo for the bindings: https://github.com/Freezerburn/Rhipmunk-Physics if you want to take a loo

[racket] minimum spanning tree

2012-12-02 Thread Joe Gilray
I searched the mailing list archives and didn't find any references to an implementation of a minimum spanning tree algorithm. I've implemented Prim's algorithm years ago in C#, but I was surprised not to find anything on Planet or the archive. If I create an implementation, where should I "publi