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00:46 dingfeng: are there hash-tables in racket where you can specify the equality/hasing function?
00:48 mithos28: dingfeng: not that I know of, but you could make them. Using a chaperone and a wrapper object whose equality is based on the hashing function you want.
00:49 dingfeng: i see, thanks =)
00:50 mithos28: If you want them, and that is over your head, submit a feature request
01:00 dingfeng: hm... what are the advantages of using chaperones instead of using a hash table that is constructed with its own equality/hash/ordering function?
01:01 mithos28: you cannot construct a hash with its own equality/hash/ordering function. But you can specify it for objects
01:01 mithos28: so you make a wrapper around your objects, so that its hashing corresponds to the hashing you want
01:02 mithos28: sorry you will need impersonators not chaperones, but the impersonator will let you hide the wrapping and wrapping from the users of your hash table
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01:06 dingfeng: are native hashes different from the hash-tables that a user my write for himself?
01:07 mithos28: the impersonators will let you make them appear the same as native ones.
01:07 mithos28: hash?, hash-ref, hash-set! will all work
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01:17 dingfeng: just read through the impersonator reference
01:17 dingfeng: it's just that... using impersonator to do this appears roundabout
01:18 mithos28: If you want them to appear as normal hash tables that is the only way, if you want to build a data structure that works like a hash table but with your own operations you can do it without
01:18 mithos28: impersonators
01:20 dingfeng: was wondering about why the default hash table was implemented this way, instead of parameterizing over the hash function like the defaults in many other languages
01:20 dingfeng: i understand that both methods work, and one preserves the syntax
01:21 mithos28: what languages are you thinking of that do it the other way
01:22 mithos28: you need to implement the eq variant specially if it is based of pointer-equality and the garbage collector can move objects
01:27 mithos28: https://gist.github.com/1277356
01:27 mithos28: a simple example of using impersonators to make a hash where strings are hashed by their length
01:40 dingfeng: thanks. using impersonators is definitely convenient and not hard. other languages would be like java and python.
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01:41 mithos28: java has the .hashcode() method like racket. Hashing is defined by objects not by the hash table.
01:42 mithos28: and I am pretty sure python doesn't let you change the how the hash is calculated on a per dictionary setup
01:44 mithos28: I changed my gist to implement arbitrary hashing behavior
01:45 dingfeng: python is similar to java, with the __hash__ method or something like that.
01:45 mithos28: so that should let you provide the hashing functions and the hash will work with those instead of the normal ones
01:46 mithos28: which is the same as racket, objects define their hashing behavior and not the hash table. Normally that is.
01:46 dingfeng: thanks mithos28. practically, i see how to do it.
01:47 mithos28: no problem
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03:30 Blkt: good morning everyone
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03:58 primeiro_: hey all
03:59 primeiro_: I'm confused, is dr racket the recomended implementation to follow sicp?
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04:06 dingfeng: good morning
04:11 primeiro_: good morning
04:12 primeiro_: dingfeng: are you in europe?
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04:39 dingfeng: i'm in singapore
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05:52 tim-brown: is the 3m GC available as a separate library, or was it developed specifically for plt/racket?
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08:55 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/hcR62g
08:55 RacketCommitBot: [racket/master] add missing GC registration for places - Matthew Flatt
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09:34 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/lIcDlA
09:34 RacketCommitBot: [racket/master] adjust 2htdp/image library so that it doesn't create arbitrarily large - Robby Findler
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10:43 ohwow: hm
10:43 ohwow: How can I make a regexp matching '(' or ')' ? #rx"\(|\)" doesnt work
10:43 ohwow: altho I thought that it should
10:46 (nick) samth_away -> samth
10:50 samth: mithos28, dingfeng: see `make-custom-hash'
10:50 samth: rudybot: doc make-custom-hash
10:50 rudybot: samth: your racket/init sandbox is ready
10:50 rudybot: samth: http://docs.racket-lang.org/reference/dicts.html#(def._((lib._racket%2Fdict..rkt)._make-custom-hash))
10:51 dingfeng: ok =)
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11:45 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/Yi_SJw
11:45 RacketCommitBot: [racket/master] error message typo - Robby Findler
11:45 RacketCommitBot: [racket/master] adjust the autosave gui so that closing the window doesn't cause drracket to - Robby Findler
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12:49 eli: ohwow: #rx"[()]" or #rx"\\(|\\)"
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12:53 ohwow: thanks
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13:07 tewk: stamourv: QNX Port, a group in germany is interested in using places and distributed places for the higher-levels of a robotic system.
13:07 tewk: They run QNX and Linux in i386 hardware.
13:10 samth: tewk: ping
13:10 samth: tewk: any thoughts on the places gc logging issue that i sent you and matthew an email about?
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13:27 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/WkTswQ
13:27 RacketCommitBot: [racket/master] more memory accounting fixes for places - Matthew Flatt
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14:14 stamourv: tewk: Cool.
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15:15 danking: Is there a `leave!' which will allow me to return to the previous ... Well. I'm not sure I can intelligently say what I want, but I want to get my definitions back from before the enter!.
15:21 eli: danking: (enter! #f)
15:21 eli: danking: But if you're doing these kind of things, you should absolutely use xrepl.
15:25 danking: In that case, it would seem I should absolutely get the latest version of Racket as well.
15:27 eli: danking: Which version are you on?
15:27 danking: eli: 5.1
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15:28 eli: danking: I have a version that I butchered into working with 5.1.3, it might work with 5.1 too -- but there's also the previous life of this thing which I referred to as my "interactive hack" (which you can get from my web page).
15:29 eli: But if you're on 5.1, it's definitely worth upgrading.
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15:29 danking: eli: Yeah, I just grabbed 5.2.0.1
15:30 danking: I'll finally get to check out xrepl.
15:30 eli: danking: For your limited use, just add (require xrepl) to your ~/.racketrc, and then: ,en /your/file
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15:44 tewk: samth: I talked to mathew about it this morning.  You could send the logging messages back to the original place over a place channel.  Eventually we want to build that functionality in for the user, but I don't have a time frame.
15:53 danking: eli: Are you sure the ,en shortcut is in the latest verison of Racket? ,enter works fine.
15:54 eli: danking: What happens when you use ,en ?
15:56 danking: "unquote: not in quasiquote in: (unquote en) \n [,bt for context]" ,bt doesn't work either. I'm using geiser-mode, so perhaps that's messing with it.
15:57 eli: Try it on a plain shell, and if it does (which it should) then complain there...
15:58 danking: eli: Yeah, works fine in a shell. I'll have to go hunt down the geiser folks.
15:58 eli: jao: (see above)
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17:43 DanBurton: Random question: is there a way to compile Racket to JavaScript?
17:44 DanBurton: Meaning, I write a file with some functions and stuff in Racket, and I want it to produce a .js file with JS functions of the same name, that do the same thing. Or something like that.
17:47 stamourv: DanBurton: Have a look at dyoo's Moby and Whalesong.
17:47 stamourv: It's on dyoo's github.
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17:49 DanBurton: stamourv: cool, I'll take a look
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19:27 RacketCommitBot: [racket] plt pushed 8 new commits to master: http://git.io/vH5d4A
19:27 RacketCommitBot: [racket/master] revert GC block cache to reasonable size - Matthew Flatt
19:27 RacketCommitBot: [racket/master] reduce place-channel allocation - Matthew Flatt
19:27 RacketCommitBot: [racket/master] skip future mutex if no futures started - Matthew Flatt
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22:41 igggy: could anyone point me some sample applications made with racket?
22:41 igggy: just curious about what people is doing with it
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23:08 asumu: igggy: There are some apps on PLaneT (planet.racket-lang.org), but the most significant app written in Racket is DrRacket.
23:09 igggy: the gui language seems pretty robust, Why isn't people hacking with it all over the place?
23:09 asumu: Also I believe fluxus uses Racket: http://www.pawfal.org/fluxus/
23:10 asumu: igggy: I don't know, but there also tend to be uses of Racket we don't know much about. It's used by at least one game dev company for game DSLs.
23:12 igggy: looks cool
23:13 igggy: i find planet's browsing interface rather cluttered
23:13 igggy: is it possible to search based on specific language used?
23:13 asumu: Not that I know of. It would be nice if it were easier to navigate, yeah.
23:14 asumu: If you want to see GUI examples in particular, there is an e-mail client called SirMail in the source tree.
23:15 asumu: It seems like a fairly complete e-mail app, but I only know of one user (Matthew Flatt).
23:16 igggy: is it distributed with drracket installer?
23:23 francisl__: hi, I'm also curious, where can we find the SirMail?
23:28 francisl__: ok, tried to run it, but doesnt seem to run on osx, required cairo
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