| --- Log opened Wed Sep 10 00:00:51 2014 |
| --- Day changed Wed Sep 10 2014 |
| 00:00 | < Harlow> | k, well thanks for the help [R], I'm just going to read up some more on structs and how they work with accessors. |
| 00:01 | < [R]> | Hint: if you've got a struct, you use .; if you've got a pointer to a struct you use -> |
| 00:01 | < Harlow> | k |
| 00:01 | < Harlow> | gtg battery low |
| 00:01 | < [R]> | bye |
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| 01:29 | <@RchrdB> | McMartin, free(NULL) is specifically defined to be a no-op, IIRC by ANSI C89 and also by POSIX according to this man page I have here.. |
| 01:29 | <&McMartin> | RchrdB: So it was quoted. I distinctly recall having burned by this in the past though, so it's a thing I try to avoid. |
| 01:30 | <@RchrdB> | a stackoverflow poster finds chapter and verse http://stackoverflow.com/a/1938758/157044 |
| 01:30 | <&McMartin> | It's already been quoted above, like I said. |
| 01:31 | <@RchrdB> | Sorry, I missed that somehow. |
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| 02:09 | <@RchrdB> | INTERESTING THING THAT I JUST LEARNED: |
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| 02:09 | <@RchrdB> | setjmp() triggers undefined behaviour unless you call it in certain contexts. |
| 02:16 | <@RchrdB> | if(setjmp()), while(setjmp()), switch(setjmp()), for (whatever; setjmp(); whatever) are all allowed, as !setjmp() in any of those places, as are "setjmp() = some_integer_constant". |
| 02:16 | <@RchrdB> | setjmp(); and (void)setjmp(); as entire statements with no other code in the same statement are also allowed. |
| 02:17 | <@RchrdB> | so "int i = setjmp()" is undefined behaviour according to ISO/IEC 9899:1999 :) |
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| 02:43 | <@macdjord|slep> | RchrdB: ... it seems weird to allow 'switch(setjmp())' but not 'int i = setjmp();switch (i)' |
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| 03:22 | <@RchrdB> | macdjord, yeah, but that's what C99 says. |
| 03:22 | <@macdjord> | RchrdB: What is the official return type? |
| 03:23 | <@RchrdB> | int |
| 03:23 | <@RchrdB> | setjmp() is magic in a few other ways, like it's undefined behaviour if you declare it extern yourself instead of importing setjmp.h, because the spec reserves the right for it to be a macro in setjmp.h |
| 03:26 | <@RchrdB> | I would *guess* that "int i=setjmp();" is given as undef behaviour because longjmp() is allowed to clobber local variables in the function that setjmp() was called in, under some circumstances, and so the semantics of assigning to a variable that longjmp() might clobber would be way too awkward to specify so it's easier for everybody to leave it as UB and refrain from doing that. |
| 03:28 | <&McMartin> | ... Oh right |
| 03:28 | <&McMartin> | if (setjmp()) {} is basically call-with-escape-continuation, so let's not demand we can store aspects of those in locals |
| 03:39 | <@RchrdB> | I get the impression that some of the UB circumstances in the C spec are actually "we _could_ define this behaviour, and compilers _could_ implement it, but the complication would make the spec worse and the compilers buggier, and it's easy enough for programmers to simply not do that". |
| 03:41 | <@RchrdB> | McMartin, is call/ec a restricted case of call/cc? |
| 03:41 | <&McMartin> | Yes. |
| 03:41 | <&McMartin> | It's one where the continuation becomes invalid once the evaluation context of call/ec is done. |
| 03:41 | <&McMartin> | So basically exceptions and nonlocal return. |
| 03:42 | <@RchrdB> | oh this is nice |
| 03:42 | <@RchrdB> | http://docs.racket-lang.org/reference/cont.html |
| 03:42 | <&McMartin> | Yes |
| 03:42 | <&McMartin> | Racket is pretty much the go-to language for crazy-ass control constructs once Scheme has been mastered. |
| 03:42 | <@RchrdB> | I don't think it's all that crazy... |
| 03:43 | <@RchrdB> | The thing I was thinking was nice is that the documentation for Racket (née PLT Scheme)'s continuations module appears to *start* by recommending delimited continuations rather than full continuations :) |
| 03:45 | <@RchrdB> | I didn't dig in enough to understand it but there are a bunch of Oleg Kiselyov papers/demonstrations/rants about how delimited continuations (which I think is what call-with-continuation-prompt implements) are more powerful than full continuations (call-with-current-continuation) |
| 03:47 | <@RchrdB> | ... |
| 03:47 | <@RchrdB> | (call/slep RchrdB) |
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| 06:03 | < Harlow> | hey [R] you still around? the point you made about init, yeah thats the single most important mistake that i made in my actual program. thanks |
| 06:03 | < Harlow> | the stuff i was sharing was just a mock to try and understand what i could have done wrong. |
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| 07:17 | < Harlow> | if anyone has any insight as to why this simple statement would throw an invalid lvalue error, I'm all ears. int modify=0;//Value of ")" |
| 07:17 | < Harlow> | check==41?modify=1:modify=2;//Value of ")" is 41. |
| 07:20 | <&McMartin> | You want "modify = check == 41 ? 1 : 2;" |
| 07:20 | <&McMartin> | If the actual error is "invalid lvalue" |
| 07:21 | <&McMartin> | It's reading it as (check == 41 ? modify = 1 : modify) = 2 |
| 07:21 | <&McMartin> | Don't use ?: in place of if-then when you're doing statements. |
| 07:23 | < Harlow> | Well that was simple enough, didn't know it worked like that, only used it sparingly and just to call functions, seemed to work fine there, but i guess if you call a void function there is no return so it would work fine. |
| 07:28 | <&McMartin> | The way you thought ?: worked is the way if statements work in languages like Lisp. |
| 07:28 | <@froztbyte> | McMartin: ping |
| 07:28 | <@froztbyte> | oh you're awake |
| 07:28 | <&McMartin> | What's up |
| 07:28 | <@froztbyte> | uhm |
| 07:28 | <@froztbyte> | the idea in https://inconshreveable.com/09-09-2014/sweat-the-small-stuff/ |
| 07:28 | <@froztbyte> | of the cli exit hook |
| 07:28 | <@froztbyte> | do you know if there's a common thing in windows country for that? |
| 07:29 | <@froztbyte> | like a lib or a build-time setting? |
| 07:29 | <&McMartin> | I'm not aware of one. Explorer.exe and console apps do not live in harmony. |
| 07:30 | <@froztbyte> | haha |
| 07:30 | <@froztbyte> | kk |
| 07:31 | <&McMartin> | That means "hey, this thing he wrote is a big deal, it should be ported beyond Go library extensions", in case that wasn't clear ;-) |
| 07:31 | <@froztbyte> | yeah that was my guess too, but I haven't tried to compile anything outside of a nasm target in literal years |
| 07:31 | <@froztbyte> | McMartin: this was /also/ another thing I guessed ;) |
| 07:33 | <&McMartin> | This looks like a thing I could do in C. |
| 07:34 | <&McMartin> | I have another Project I'm fiddling with just now but this is probably readily doable on a lazy weekend |
| 07:34 | <&McMartin> | When you test console apps in visual studio, when you say "run" it instead runs a batch file that calls your program and then "pause" |
| 07:34 | <@froztbyte> | it's one of those pieces of software that initially looks really dumb to me, but then I realize what kind of knowledge I carry |
| 07:35 | <@froztbyte> | like I have the first reaction of '....why bother?' |
| 07:36 | <&McMartin> | I didn't know about cmd /K, actually, that's pretty great |
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| 11:03 | <@Tarinaky> | Regular Exressions: |
| 11:03 | <@Tarinaky> | I have a base16 stream with no seperating characters. |
| 11:04 | <@Tarinaky> | I want to 'split' it into blocks of 4 digits, prepended by 0x |
| 11:04 | <@Tarinaky> | Suggestions? |
| 11:05 | < Syka> | Tarinaky: a loop? |
| 11:05 | <@RchrdB> | Tarinaky, python? |
| 11:05 | <@Tarinaky> | That would actually be sensible. |
| 11:08 | <@Azash> | s/(.{4})/0x\1 /g ? |
| 11:10 | <@Tarinaky> | I don't have a decent enough shell for copy-pasting between vim and irb though :( |
| 11:10 | <@Tarinaky> | So that solution fails >.< |
| 11:11 | <@Tarinaky> | Azash: Your regexp doesn't work in vim :( |
| 11:12 | <@Azash> | Shame |
| 11:12 | <@Azash> | McMartin: "modify = check == 41 ? 1 : 2;" is not very readable though |
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| --- Log closed Wed Sep 10 11:34:27 2014 |
| --- Log opened Wed Sep 10 11:34:36 2014 |
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| 11:35 | <@Tarinaky> | Well, that sucked. |
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| 13:48 | | * TheWatcher stabs the mingw devs |
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| 13:48 | | * Azash sympathizes with coworker dealing with an API that requires ordered XML elements |
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| 14:34 | <@TheWatcher> | Why is this thing not creating start menu entries anymore? Piece of shit. |
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| 18:22 | <&jerith> | Azash: XML elements are supposed to be ordered. |
| 18:39 | <@Azash> | jerith: According to the coworker, the specification doesn't guarantee any order |
| 18:40 | <@Azash> | His problem being that the older version of Ruby he uses doesn't sort arrays in order of addition |
| 18:43 | <&jerith> | Azash: The XML specification says that element order matters. |
| 18:45 | <&jerith> | Unless this is a particular schema which explicitly says it doesn't. |
| 18:48 | <@Azash> | I suppose he meant it doesn't guarantee XML to follow a certain ordering scheme then |
| 18:49 | <@Azash> | Anyway whichever way it goes, it's also pretty terrible of an API to literally bring down its entire system if mandatory fields are not where they are expected to be |
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| 23:40 | <@TheWatcher> | fuck you, g++ |
| 23:41 | <&McMartin> | All the murderings |
| 23:41 | <&McMartin> | Some of this is C++'s fault, but not all of it |
| 23:41 | <&McMartin> | "Oh, you wanted to link across compilation units, that's adorable" |
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| 23:42 | <&McMartin> | I'm going to apportion that one about 60% C++ 40% g++ |
| 23:47 | <@TheWatcher> | "error: expected unqualified-id before 'char'" |
| 23:47 | <@TheWatcher> | my mos favourite error |
| 23:47 | <@TheWatcher> | *most |
| --- Log closed Thu Sep 11 00:00:35 2014 |