| --- Log opened Tue May 29 00:00:38 2018 |
| 00:03 | | Kindamoody is now known as Kindamoody[zZz] |
| 00:11 | | * McMartin gets simavr and avr-gdb working well enough to validate his function, woot |
| 00:27 | | Jessikat [Jessikat@Nightstar-pd8uo5.dab.02.net] has quit [[NS] Quit: Bye] |
| 00:34 | | * McMartin also determines that avr-gcc is Just Fine At This |
| 00:35 | <&McMartin> | "Optimize for size" only lost 8 bytes from my hand-coded routine, and those 8 bytes were all because of one trick I used to exploit data layout. |
| 00:36 | <&McMartin> | (Which meant I got to write all my state out through one pointer instead of naming four extra addresses) |
| 00:36 | <&McMartin> | "Optimize for speed" does a hilarious strength reduction on some code which I think will be the punchline of my next Bumbershoot post. |
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| 01:20 | | Mango1 [Frankie_Boy@Nightstar-hqmi86.abhsia.telus.net] has joined #code |
| 01:20 | | * Mango1 waves to the room. |
| 01:22 | < Mango1> | Using Javascript, I need to convert a string like "2,4,6-8,10-12" to an array like [2,4,6,7,8,10,11,12]. I don't suppose there's a prebuilt function that does this? |
| 01:26 | < Mango1> | Ah. I do believe I found it. |
| 01:26 | < Mango1> | https://codereview.stackexchange.com/questions/26125/getting-all-number-from-a-string-like-this-1-2-5-9 |
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| 02:53 | < Degi> | https://i.redd.it/p0v3ufhftl011.jpg |
| 02:57 | <&McMartin> | Confirmed |
| 02:57 | <&McMartin> | ;_; |
| 03:00 | <&McMartin> | (See also: using ᐸTᐳ - and those are Canadian Aboriginal Syllabics, mind you, not angle brackets - to pretend Go has generics) |
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| 03:09 | <@celticminstrel> | XOR swap, huh. Does that actually work in scripting languages? |
| 03:09 | <@celticminstrel> | Like JS, Python, etc. |
| 03:09 | <@celticminstrel> | Because IIRC they treat the bitwise operators a little weirdly. |
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| 03:17 | <&McMartin> | As long as the integer you use fits within a double, you're fine |
| 03:17 | <&McMartin> | All integers are exactly representable until you run out of mantissa bits, so you can convert floating point to integer, do your operation, then convert back to floating point |
| 03:17 | <&McMartin> | IIRC asm.js uses "|0" to mean "this number is actually an integer" |
| 03:19 | <@celticminstrel> | I'm assuming this refers specifically to JS and not scripting langs in general. |
| 03:20 | <&McMartin> | Yes but this behavior is extremely common in scripting langs |
| 03:20 | <@celticminstrel> | Does it work in Python too then? |
| 03:20 | <@celticminstrel> | The XOR swap. |
| 03:20 | <&McMartin> | As long as XOR doesn't produce wrong answers it should. |
| 03:21 | <&McMartin> | XOR as a reversible mask is kind of how XOR rolls. |
| 03:23 | <@celticminstrel> | ISTR bitwise operators in Python producint unintuitive results though. |
| 03:23 | <@celticminstrel> | Like, behaving as if there exist no bits beyond the most significant 1 bit in the integer? |
| 03:23 | <&McMartin> | I'm going to need a citation for that one. |
| 03:23 | <&McMartin> | Oh |
| 03:23 | <&McMartin> | That doesn't affect XOR. |
| 03:23 | <@celticminstrel> | I should probably go try it again before explaining properly... |
| 03:23 | <@celticminstrel> | Oh? |
| 03:24 | <&McMartin> | or wouldn't |
| 03:24 | <&McMartin> | A XOR B; take one of the values as the "base". the bits in the other specify which bits are to be flipped in the other. |
| 03:24 | <&McMartin> | So X XOR 0 is X for all X |
| 03:24 | <&[R]> | <McMartin> IIRC asm.js uses "|0" to mean "this number is actually an integer" <-- new trick! |
| 03:25 | <&[R]> | Though ~~ works too |
| 03:25 | <&McMartin> | [R]: Note that *outside* of asm.js this just performs the conversion and then converts it right back. |
| 03:25 | <&[R]> | Aye, but there are a few times where I've wanted some kind of guarantee a number is an int and not a float |
| 03:25 | <&[R]> | IE: there's no decimal point |
| 03:26 | <&McMartin> | As in, has been floored/ceilinged? |
| 03:26 | <&[R]> | Yeah |
| 03:26 | <&McMartin> | Because the whole thing with JS is that *all* numbers are IEEE 754 double-precision floats, IIRC. |
| 03:26 | <&[R]> | I'm well aware |
| 03:26 | <&[R]> | Also PHP has all the bitwise operators too |
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| 03:28 | <&McMartin> | Perl is also similar, IIRC |
| 03:28 | <&McMartin> | But Python has unlimited-precision integers |
| 03:30 | <@celticminstrel> | But not unlimited-precision floats. :( |
| 03:30 | <&McMartin> | That's what unlimited-precision rationals are for. |
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| 03:32 | <@celticminstrel> | But then how are you supposed to represent the area of a circle? |
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| 06:00 | <@Pi> | Python does have good unlimited precision binary float libraries. |
| 06:01 | <@Pi> | And decimals in the standard library, of course. |
| 06:01 | <@Pi> | Neither can do irrational numbers, though. :) |
| 06:41 | < simon_> | Pi, I'm experiencing a little annoyance in Haskell: I've got a Gen called DaggerGen for my AST that I'm currently using to QuickCheck my parser. since my Arbitrary instances are inside my DaggerGen module, and since I'm generating a specific subset of ASTs (ones that should also type-check), I've made some newtypes like ValidContract instead of Contract. |
| 06:41 | < simon_> | Pi, so the sub-types like Time and Expr in my AST also have custom Arbitrary instances like AnyTime and ValidExpr (not mixing bools and ints, e.g.) |
| 06:42 | < simon_> | Pi, and so my 'shrink' definitions have to do a lot of packing and unpacking of these newtype constructors. |
| 06:42 | < simon_> | e.g.: |
| 06:42 | < simon_> | shrink (ValidContract contract) = case contract of |
| 06:42 | < simon_> | Scale maxFactor scaleFactorExpr c -> map ValidContract $ |
| 06:42 | < simon_> | [c] ++ map (\(IntExpr expr) -> Scale maxFactor expr c) (shrink (IntExpr scaleFactorExpr)) |
| 06:42 | < simon_> | ++ map (\(ValidContract c') -> Scale maxFactor scaleFactorExpr c') (shrink (ValidContract c)) |
| 06:44 | < simon_> | do you think there's a neater way than packing and unpacking these all the time? I could make a shrinkIntExpr, etc. that does packing and unpacking. |
| 06:54 | <@Pi> | simon_: Hmm, I think that's a design thing in QuickCheck. |
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| 07:22 | < simon_> | Pi, yeah okay. well, I guess I *do* want to explicitly say that I want a shrinked integer expression. |
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| 09:42 | < simon_> | Pi, you'd also avoid orphan type class instances, right? |
| 10:12 | <@abudhabi_> | So... how does one make HTTPS work on a newly installed apache2 server? |
| 10:37 | <@abudhabi_> | Is that synonymous with setting up SSL? |
| 11:06 | <@Pi> | simon_: Probably, yes. |
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| 14:11 | <@TheWatcher> | abudhabi_: yep |
| 14:13 | <@TheWatcher> | I can give you a simple example if you want |
| 14:23 | <@abudhabi_> | TheWatcher: Thanks, please do! (I'm a little busy ATM, so my response may be asynchronous, though!) |
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| 14:43 | <@Pi> | Obligatory pointer to https://certbot.eff.org/ |
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| 17:12 | <@abudhabi_> | I have been told that self-signed certificates are a no-no. Is this true? |
| 17:14 | <@abudhabi_> | Also, what about free SSL certificates? Like https://letsencrypt.org/ ? |
| 17:20 | <@TheWatcher> | Yesh, self-signed are going to make you No Friends Whatsoever |
| 17:20 | <@TheWatcher> | letsencrypt is made of rainbows and unicorns, though |
| 17:21 | <@abudhabi_> | Cool. |
| 17:21 | <@abudhabi_> | Curious why self-signed is bad and wrong, though. |
| 17:22 | <@TheWatcher> | As for a setup that I find works, I stick http://pastebin.starforge.co.uk/15 in /etc/apache2/includes/ssl.inc and http://pastebin.starforge.co.uk/16 in /etc/apache2/vhosts/00_starforge.conf - the wordpress.inc and cachecontrol.inc lines are http://pastebin.starforge.co.uk/17 if you want them |
| 17:22 | <@TheWatcher> | (I use includes like that because I have 30-odd subdomains) |
| 17:23 | <@TheWatcher> | self-signed gives you no trust chain |
| 17:24 | <@abudhabi_> | Thanks! I'll try this out a little later. |
| 18:47 | | Emmy is now known as Emmy-Noms |
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| 18:54 | <&[R]> | abudhabi_: there are two components to the TLS infrastructure. 1) encrypted packet streams. 2) web of trust. Self signed will get you #1, but will make browsers scream very loudly that #2 is being violated and the connection is insecure. |
| 18:54 | <@abudhabi_> | Right. |
| 18:55 | <&[R]> | The assumption browsers make with self-signed certs is that they're being used for a MitM and thus they warn the user appropriately. |
| 18:57 | < Emmy> | remember, to assume makes an ass out of u and me! |
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| 21:18 | | * abudhabi_ installs f.lux. |
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| --- Log closed Wed May 30 00:00:39 2018 |