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05:13 (topic) -: Racket -- http://racket-lang.org -- Come to Racket Days: July 23-24 -- logs @ http://racket-lang.org/irc-logs
05:13 (names) -: gabot RaceCondition misterm offby1 rudybot DT`` qha saint_cypher lucian martinhex em askhader tildedave eli friscosam evhan mario-goulart bremner_ _p4bl0 stamourv cpach tewk zakwilson petey-away shachaf mattmight cow-orker abbe lisppaste clklein @ChanServ fmu samth_away jackhill_ hyko danking cky jeapostrophe
05:13 eli: gabot: fart
05:14 eli: gabot: fart
05:15 eli: gabot: flood
05:15 eli: gabot: flood
05:16 eli: gabot: flood
05:17 (topic) -: Racket -- http://racket-lang.org -- Come to Racket Days: July 23-24 -- logs @ http://racket-lang.org/irc-logs
05:17 (names) -: gabot RaceCondition misterm offby1 rudybot DT`` qha saint_cypher lucian martinhex em askhader tildedave eli friscosam evhan mario-goulart bremner_ _p4bl0 stamourv cpach tewk zakwilson petey-away shachaf mattmight cow-orker abbe lisppaste clklein jeapostrophe fmu @ChanServ samth_away jackhill_ hyko danking cky
05:17 eli: gabot: flood
05:20 (topic) -: Racket -- http://racket-lang.org -- Come to Racket Days: July 23-24 -- logs @ http://racket-lang.org/irc-logs
05:20 (names) -: gabot RaceCondition misterm offby1 rudybot DT`` qha saint_cypher lucian martinhex em askhader tildedave eli friscosam evhan mario-goulart bremner_ _p4bl0 stamourv cpach tewk zakwilson petey-away shachaf mattmight cow-orker abbe lisppaste clklein fmu @ChanServ samth_away jackhill_ hyko danking cky jeapostrophe
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06:36 (topic) -: Racket -- http://racket-lang.org -- Come to Racket Days: July 23-24 -- logs @ http://racket-lang.org/irc-logs
06:36 (names) -: gabot RaceCondition misterm offby1 rudybot DT`` qha saint_cypher lucian martinhex em askhader tildedave eli friscosam evhan mario-goulart bremner_ _p4bl0 stamourv cpach tewk zakwilson petey-away shachaf mattmight cow-orker abbe lisppaste clklein fmu @ChanServ samth_away jackhill_ hyko danking cky jeapostrophe
06:44 (topic) -: Racket -- http://racket-lang.org -- Come to Racket Days: July 23-24 -- logs @ http://racket-lang.org/irc-logs
06:44 (names) -: gabot RaceCondition misterm offby1 rudybot DT`` qha saint_cypher lucian martinhex em askhader tildedave eli friscosam evhan mario-goulart bremner_ _p4bl0 stamourv cpach tewk zakwilson petey-away shachaf mattmight cow-orker abbe lisppaste clklein jeapostrophe fmu @ChanServ samth_away jackhill_ hyko danking cky
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11:41 offby1: gabot: what have you got to say for yourself?
11:42 offby1: we're out of chicken; the Health Department recalled it.
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14:25 PLT_Notify: racket: master Kevin Tew * 7dc22bc (1 files in 1 dirs): added scheme_place_check_for_killed prototype - http://bit.ly/eFweUl
14:25 (part) PLT_Notify
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15:59 PLT_Notify: racket: master Casey Klein * 3214861 (2 files in 2 dirs): Fixes rendering of (hole t ...+) ...
15:59 PLT_Notify: racket: master Casey Klein * faef39c (1 files in 1 dirs): Fixes the docs for non-terminal styles
15:59 PLT_Notify: racket: master commits 7dc22bc...faef39c - http://bit.ly/fsCeN9
15:59 (part) PLT_Notify
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17:08 tauntaun: Question about runtime error reporting...
17:08 tauntaun: Suppose I have (define (a) (+ 3 'hi))...
17:08 tauntaun: and I have (define (b) (a))
17:09 tauntaun: The top of the stack trace is 'a', quite naturally.
17:09 tauntaun: (i.e., the top of the stack trace when the error is thrown.)
17:09 tauntaun: Can anything be done to get the runtime to trace the call one more step to 'b'?
17:11 samth: (define (b) (let ([x (a)]) x))
17:12 samth: see: file:///home/samth/sw/plt/doc/reference/eval-model.html?q=tail#%28part._.Tail_.Position%29
17:12 samth: wait, that won't work
17:12 samth: see http://docs.racket-lang.org/reference/eval-model.html?q=tail#%28part._.Tail_.Position%29
17:12 rudybot: http://tinyurl.com/5rdm3wm
17:12 samth: tauntaun, as above
17:13 tauntaun: samth: thanks; it'll take me a while to digest this.
17:14 samth: tauntaun, also see: http://planet.racket-lang.org/package-source/dherman/tail.plt/5/0/planet-docs/tail/index.html
17:14 rudybot: http://tinyurl.com/4c747py
17:22 tauntaun: cheers
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18:31 tauntaun: Going back to my question about the immutable hashtable: since it is implemented as a RB tree, why did PLT not elect to add ordering guarantees to the abstraction's interface?
18:32 carleastlund: tauntaun: because we have no ordering guarantees on our values in general.
18:33 carleastlund: And immutable hash tables are RB trees on hash values; in the case of a collision, multiple key/value pairs can be stored at one tree node.
18:34 tauntaun: RB trees on hash *values*, not hash *keys*?
18:34 carleastlund: Terminology mixup; hash keys.
18:35 carleastlund: Er, no, wait.
18:35 carleastlund: Neither.  Hash numbers.  The keys need not be numeric.
18:35 tauntaun: Is a hash number the output of a hash function?
18:35 carleastlund: So for {key, value}, the RB tree is keyed on (equal-hash-code key)
18:36 carleastlund: Right, that's what I've been trying rather clumsily to say.
18:36 tauntaun: OK, thanks.
18:40 tauntaun: carleastlund: And that hash function is hardwired, right?  (The PLT Docs don't seem to talk about user-defined hash functions.)
18:42 carleastlund: There are three kinds of primitive hash tables with hardwired hash functions (one each for equal?, eqv?, and eq? based comparisons).  There are also "custom" hashes that do not satisfy hash? but do satisfy dict?, and are hash tables behind the scenes.
18:44 carleastlund: But in most cases, custom hashing is for custom types.  When you define a new structure type, you can define its hash function using the prop:equal+hash property.  Then equal?-based hash tables will use the behavior you write.
18:47 clklein: Which part of the docs says what's in the continuation of top-level expressions in a module? I thought that each one appears in a context that's something like (prompt (print [])), but I'm trying to nail down the details.
18:49 carleastlund: The print thing is not part of a continuation, it's part of the expansion of #%module-begin into #%plain-module-begin.  I don't know about the prompt issue, though.
18:52 clklein: Oh, I found it. "Each evaluation of an expression or definition is wrapped with a continuation prompt (see call-with-continuation-prompt) for the default continuation and using the default prompt handler."
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18:52 tauntaun: carleastlund: thanks.
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23:19 rrenaud: is it easy write write a function that returns me elements of a list in order?  something like a python generator? (let* ([l '(1 4 2)] [gen (magic l)] [a (gen)] [b (gen)] [c (gen)]) (list a b c) -> (1 4 2)
23:31 offby1: rrenaud: there are generators in there somewhere, I think.
23:31 rrenaud: yeah, reading docs now
23:31 offby1: rudybot: (require racket/generator)
23:31 rudybot: offby1: your racket sandbox is ready
23:31 rudybot: offby1: Done.
23:32 offby1: rudybot: (define g (generator () (let loop ([x '(a b c)]) (if (null? x) 0 (begin (yield (car x)) (loop (cdr x)))))))
23:32 rudybot: offby1: Done.
23:32 offby1: rudybot: (g)
23:32 rudybot: offby1: ; Value: a
23:32 offby1: rudybot: (g)
23:32 rudybot: offby1: ; Value: b
23:32 offby1: rudybot: (g)
23:32 rudybot: offby1: ; Value: c
23:32 offby1: rudybot: (g)
23:32 rudybot: offby1: ; Value: 0
23:32 offby1: rudybot: (g)
23:32 rudybot: offby1: ; Value: 0
23:32 eli: rrenaud: http://docs.racket-lang.org/reference/sequences.html#(mod-path._racket/generator)
23:36 rrenaud: okay, so this does what i want
23:36 rrenaud: (define x (sequence->generator (in-list '(1 2 3))))
23:37 rrenaud: it seems natural for such a thing to exist already (did i miss it in the docs?)
23:37 rrenaud: but i guess that's simple enough for me
23:38 offby1: rudybot: (define x (sequence->generator (in-list '(1 2 3))))
23:38 rudybot: offby1: Done.
23:38 offby1: rudybot: (x)
23:38 rudybot: offby1: ; Value: 1
23:38 offby1: rudybot: (x)
23:38 rudybot: offby1: ; Value: 2
23:38 offby1: rudybot: (x)
23:38 rudybot: offby1: ; Value: 3
23:38 offby1: rudybot: (x)
23:38 rudybot: offby1: Done.
23:38 offby1: groovy
23:38 offby1: groovy
23:38 offby1: rudybot: (x)
23:38 rudybot: offby1: Done.