| --- Log opened Wed Nov 18 00:00:40 2009 |
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| 01:40 | <@McMartin> | Whoops |
| 01:40 | <@McMartin> | So, testing out a new program, which I deliver on USB. |
| 01:40 | <@McMartin> | It's not accepting input! |
| 01:40 | <@McMartin> | Protip: When unplugging USB stuff to make room for the thumb drive, don't unplug your keyboard. |
| 01:41 | | * Derakon snerks. |
| 01:42 | < Finale> | lawl |
| 01:43 | <@Vornicus-Latens> | Pffffffffffff |
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| 03:15 | | * McMartin finishes dinner, settles in for a hopefully-not-too-long night of coding |
| 03:17 | < SmithKurosaki> | Cheater |
| 03:22 | <@ToxicFrog> | ...heeeeey |
| 03:22 | <@ToxicFrog> | malloc(0) doesn't necessarily return a valid pointer |
| 03:22 | <@ToxicFrog> | Oops. |
| 03:22 | <@ToxicFrog> | ...hmm. |
| 03:23 | <@ToxicFrog> | I think this means I need to special-case zero-length strings. |
| 03:23 | <@ToxicFrog> | Bollocks. |
| 03:26 | < SmithKurosaki> | o.0 |
| 03:27 | < Namegduf> | You're not using C strings, then? |
| 03:28 | <@ToxicFrog> | I'm bridging between C and Lua. |
| 03:28 | <@ToxicFrog> | The issue here is: |
| 03:29 | <@ToxicFrog> | - sender puts a zero-length string on the wire as LUA_TSTRING,0,; |
| 03:29 | <@ToxicFrog> | - reciever asks for int int char* |
| 03:29 | <@ToxicFrog> | - however, the char* is gotten by calling malloc(size) |
| 03:29 | <@ToxicFrog> | So the reciever ends up asking for NULL to be filled in with a zero-length string by the IO function, which complains |
| 03:35 | < simon`> | a hack would be to just allocate an extra byte per string :P |
| 03:35 | < simon`> | (even though you don't NUL-terminate. okay, this is a bad solution.) |
| 03:43 | < Rhamphoryncus> | Standard behaviour is to wrap malloc with a check that replaces size 0 with size 1 |
| 03:44 | < Rhamphoryncus> | I've seen at least a few codebases with a macro for that |
| 03:54 | < simon`> | hmm |
| 03:56 | < simon`> | on left-recursive CFGs: can't it be said that it's there, directly or indirectly, if a non-terminal can lead to itself without having eaten any terminals from the left? |
| 04:00 | | Finale [c0cb88fe@Nightstar-14e5d099.mibbit.com] has quit [[NS] Quit: http://www.mibbit.com ajax IRC Client] |
| 04:09 | <@ToxicFrog> | Rhamphoryncus: annoying, but that may be the easiest fix |
| 04:09 | <@ToxicFrog> | Allocate and then free a one-length buffer on the reciever |
| 04:09 | < Rhamphoryncus> | free? |
| 04:10 | <@ToxicFrog> | The contents get copied elsewhere. |
| 04:10 | < Rhamphoryncus> | So this is just a temporary buffer that's never touched? |
| 04:10 | <@ToxicFrog> | Correct. |
| 04:10 | < Rhamphoryncus> | And freed almost immediately after it's created.. |
| 04:10 | < Rhamphoryncus> | You could use a constant |
| 04:12 | < Rhamphoryncus> | Probably not worth it though |
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| 05:13 | <@McMartin> | simon: Absolutely. |
| 05:13 | <@McMartin> | There's More Detail Than You Really Want in the Dragon Book, as well as a systematic algorithm for removing it. |
| 05:16 | <@ToxicFrog> | <3 the Dragon Book |
| 05:16 | <@ToxicFrog> | Rhamphoryncus: I ended up special-casing it, in a manner that has the added advantage of not sending two messages for zero-length strings. |
| 05:18 | < Rhamphoryncus> | oh, performance is an issue then :) |
| 05:21 | < Tarinaky> | I've managed to grasp accepters but I'm struggling with parsers now in the Dragon Book :/ |
| 05:21 | < Tarinaky> | Which is impressive because I've only had the book for months now >.> |
| 05:21 | <@McMartin> | The short form is that a parser is an acceptor that does something with the components, or, to flip it around, an acceptor is a parser that turns a string into a boolean |
| 05:22 | <@McMartin> | Usually you have it turn the string into some kind of recursive data structure, typically a tree (Abstract Syntax Tree). |
| 05:23 | < Tarinaky> | Yeah. I got that. |
| 05:23 | < Tarinaky> | It's the specifics that're a pain. |
| 05:23 | < Tarinaky> | aka actually making it happen and work. |
| 05:31 | <@ToxicFrog> | Rhamphoryncus: indeed; the binding is for Pilot, which is a cluster computing library. |
| 05:32 | <@ToxicFrog> | Tarinaky: I recommend starting with a simple input language (say, arithmetic expressions) and a comfortable implementation language. |
| 05:38 | | * Vornicus-Latens is writing a simple dice calculator in Javascript. It's not too horrible but wishes he could use more up-to-date js constructs. |
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| 06:22 | | mode/#code [+o AnnoDomini] by Reiver |
| 07:43 | < Reivthia> | Unity, a mid-level game engine went from $200 to freeware. http://www.gamasutra.com/php-bin/news_index.php?story=25840 |
| 07:45 | <@McMartin> | That's the engine that Off-Road Velociraptor Safari was written in, IIRC. |
| 07:47 | < Namegduf> | "We get the most incredible emails. One of the most recent was, "I've been using Unity for four days now, and I've regained my faith in humanity."" |
| 07:48 | < Namegduf> | That's some engine. |
| 08:07 | < Alek> | http://www.thinkgeek.com/homeoffice/gear/69e3/ |
| 08:09 | <@AnnoDomini> | http://i49.tinypic.com/2hi5bmw.jpg |
| 08:10 | < Namegduf> | It's beautiful. |
| 08:10 | < Alek> | *drool* |
| 08:13 | <@Vornicus> | ...want. |
| 08:27 | | Vornicus is now known as Vornicus-Latens |
| 08:49 | | You're now known as TheWatcher |
| 08:54 | < Rhamphoryncus> | I want too :( |
| 08:54 | < Rhamphoryncus> | too damn many d20s though |
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| 15:25 | < EvilDarkLord> | Hmm. I need a probability distribution. I am tossing a coin with heads-probability p. I do this N times. I need the distribution for number of heads. |
| 15:29 | <@ToxicFrog> | Binomial |
| 15:30 | < EvilDarkLord> | Heh, was just gonna say I found it. |
| 15:31 | <@ToxicFrog> | p(X==k) == (N choose k)(p^k)(1-p)^(N-k); mean == Np; variance == Np(1-p) |
| 15:32 | < EvilDarkLord> | Yeah, variance was what I was looking for, specifically to get the standard deviation. |
| 15:32 | | * EvilDarkLord is making a machine to prove that BPP is closed under union, whoo. |
| 15:55 | <@MyCatVerbs> | You can approximate it as Poisson if p is really small and N is really huge. |
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| 21:00 | < Finale> | http://mibbit.com/pb/KHob3B |
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| 22:07 | <@McMartin> | Man, what the Hell, Windows. |
| 22:08 | <@McMartin> | Introduced in Windows 2000: API calls that let you get thread IDs of stuff happening in other processes. |
| 22:08 | <@McMartin> | API calls that let you get the process id a thread id is running in: added in Windows Vista |
| 22:25 | <@Vornicus-Latens> | Pfffff |
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| --- Log closed Thu Nov 19 00:00:55 2009 |