#zig on 2021-01-27 — irc logs at freenode.irclog.whitequark.org

2019-02-22 01:34 ChanServ changed the topic of #zig to: zig programming language | https://ziglang.org | be excellent to each other | channel logs: https://irclog.whitequark.org/zig/

00:03 <ed_t> anyone know of examples of using std.sort to sort structures. I assume I will have to pass a compare function...

00:04 <dvaun> i see a `binarySearch`, `insertionSort` and others in the sort file

00:04 <andrewrk> ed_t, check the tests in sort.zig for example usage

00:17 <ed_t> I am not understanding how the example comptime funtions are working. Anyone have an example for a user defined stucture?

00:18 <ed_t> in std.sort

00:21 <justin_smith> ed_t: in test "binarySearch" look at S, it has functions for u32 and i32 but a function on a custom struct would have the same outline

00:22 <justin_smith> you usually don't need context, and the next two args it receives will be instances of your type

00:28 <ed_t> that almost makes sense except its returning math.Order. Does not sort require a lessthan function and a boolean?

00:29 <justin_smith> ed_t: no, the functions there are literally what it provides to sort

00:31 <ed_t> then I am still very confused (40+ of programming in I do not know how many languages, it gets very very frustrating when something you know is simple does not make sense)...

00:31 <justin_smith> ed_t: oh, wait, I think I see what you mean - what I pointed out was what binarySearch uses, which is a different sig

00:31 <justin_smith> ed_t: I wrongly assumed the other sort functions would use the same type, they don't

00:32 <ed_t> so S for sort would contain one function for lessthan returning a boolean?

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00:32 <justin_smith> ed_t: std.sort.sort you want a function of this sig: fn (context: @TypeOf(context), lhs: T, rhs: T) bool

00:33 <justin_smith> where T matches the type in your collection, and context can be void as in that other example (and usually is)

00:35 <ed_t> there are two pub fn asc and desc, some how I need to use them to build my compare - I think

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00:36 <justin_smith> so pub fn my_structLT(context: void, a: MyStruct, b: MyStruct) bool { return a.foo() < b.foo(); }

00:36 <justin_smith> ed_t: asc and desc are conveniences for arbitrary numeric types

00:36 <justin_smith> all you need is to take a void arg, two of your type, and return a bool

00:37 <ed_t> let me see if I can get that to work. I am making progress in learning this language

00:38 <justin_smith> ed_t: it's unusual (knowing ml before learning zig helped for me), but the rules are actually smaller and simpler than what I'm more familiar with

00:39 <justin_smith> sorry for the sidetrack with binarySearch, I should know better than to have assumed it would use the same type of comparator sort does

00:39 <ed_t> my set of languages are a bit dated but the ideas are similar

00:40 <ed_t> justin_smith no need to be sorry. Help IS appreciated. Very much so.

00:42 <justin_smith> ed_t: a working sort comparator from before I knew about the built in ones: "pub fn less_than(_: void, a: isize, b: isize) bool { return(a < b); }"

00:51 <ed_t> error: expected function, found 'type'

00:51 <ed_t> sort(point, alive.items, {}, point_lt);

00:52 <ed_t> probably something stupid

00:52 <ed_t> point is:

00:52 <ed_t> const point = struct {

00:52 <ed_t> x: u32,

00:52 <ed_t> };

00:52 <ed_t> y: u32

01:00 <justin_smith> ed_t: is point_lt a struct containing a function or a function? that's the only function arg it expects right?

01:01 <ed_t> function

01:01 <ed_t> pub fn point_lt(context: void, a: point, b: point) bool {

01:01 <ed_t> return a.x < b.x and a.y < b.y; }

01:04 <ed_t> pub fn sort(

01:04 <ed_t> items: []T,

01:04 <ed_t> context: anytype,

01:04 <ed_t> comptime T: type,

01:04 <ed_t> comptime lessThan: fn (context: @TypeOf(context), lhs: T, rhs: T) bool,

01:04 <ed_t> ) void

01:05 <g-w1> sorry to interrupt, but when sharing code, can you use a pastebin? the code clutters up irc

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01:39 <ed_t> if any wonders what std.sort caused errors, it was that you need to call std.sort.sort

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02:14 <ed_t> is there a problem with std.sort.sort

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02:16 <ed_t> I have an arraylist of structs (call it a), pass call std.sort.sort(mystruct, a.items, {}, mystruck_lt) but nothing is sorted

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02:47 <andrewrk> std.sort.sort has a high degree of test coverage

02:47 <andrewrk> perhaps step through your code with a debugger and see what is happening

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10:44 <ifreund> andrewrk: I think your single allocation version is better, having only one alloc makes the error handling a lot cleaner

10:45 <ifreund> I have a bunch of Uni work due today which has kept me away from it, feel free to close my PR and merge yours if it's ready to go :)

10:45 <ifreund> otherwise I should have time to work on this tomorrow

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12:01 <ed_t> any reason std.sort.sort would not work on arryList contents (xxx.items)? Here I call sort but the list is not sorted.

12:02 <dutchie> it should work, can you paste a full snippet somewhere?

12:07 <ed_t> https://0bin.net/paste/uTgGbBLk#GEjcwZHWSRuQ4lojWGr5ggpYu1l-9HZlzuv4Tq3DS9k

12:08 <ed_t> the debug prints are the same before and after the sort

12:08 <ed_t> I am a zig newbee so it could easily be something I am doing... however zig is not complaining.

12:09 <ifreund> it looks like you are not adding any items to the ArrayList

12:10 <ed_t> there are items in it I just did not include that code in the sample

12:12 <ifreund> and is the list already sorted according to that function before you call sort?

12:12 <ifreund> hard to know without seeing all the code :P

12:15 <ed_t> https://0bin.net/paste/3UYxF7fA#td-sg6lOn4i41yDyAsxRxiLXTOg/CebIl0QwW0JasgL

12:16 <ed_t> I am teaching myself zig so I suspect there is alot that can be improved, aside from the sort it works.

12:22 <dutchie> it seems to work for me. i wonder if it's a little weird because that point_lt function isn't a total order in the mathematical sense: you can have two points p1 and p2 such that neither p1 < p2 nor p2 < p1

12:22 <ifreund> ed_t: I think the problem is with your point_lt function. (10,12) < (11,10) and (11,10) < (10,12) are both true depending on what order the args ar passed

12:23 <dutchie> yeah, also that

12:24 <ifreund> You'd probably get better results with (a.x + a.y) < (b.x + b.y)

12:24 <ifreund> which is a total ordering

12:26 <dutchie> or lexicographic order: https://0x0.st/--tA.zig

12:27 <dutchie> (i forget whether there is a helper to define lexicographic order in std somewhere)

12:27 <dutchie> oh, there's one in std.mem.lessThan for slices

12:35 <ed_t> that seems to work. thought 'and' stopped evaluating when the first term is false

12:37 <ed_t> btw what IDE are you using (I am using kde's kate with some syntax hilighting and LSP support) but its klunky

12:40 <ed_t> bbiab shoveling time

12:40 <ifreund> I use kakoune with kak-lsp

12:41 <ifreund> 'and' does stop evaluating when the first term is false, but that doesn't affect the fact that your function wasn't a total order

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13:26 <ed_t> you used a different allocator than my example. Is there a guide somewhere for when to use differing allocators?

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13:44 <dutchie> ed_t: https://ziglang.org/documentation/master/#Choosing-an-Allocator

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13:48 <v_m_v> Hello. Does anyone have some exp. with zig and zeroMQ C binding?

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15:51 <ed_t> is there a simple way to have a program pause for a second or two?

15:52 <dutchie> `std.time.sleep(nanoseconds: u64) void`

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18:17 <andrewrk> ifreund, there is one upside to the separate allocations: it lets you do the equivalent of toOwnedSlice() and have the allocator shop off the extra bytes

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18:18 <andrewrk> I'll test both and report back

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18:23 <ifreund> andrewrk: note that in my current implementation the allocations aren't aligned properly, gotta fix that if we go with the separate allocations

18:23 <andrewrk> oh yeah I noticed that. I think the sorting in mine solves that but it doesn't (yet?) solve the rare case of a field with larger alignment than size

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18:25 <ifreund> with how things are currently structured and because the allocator interface requires alignment to be comptime-known, handling it properly with multiple allocations might get a little ugly

18:25 <andrewrk> if you had such a situation you probably don't want this data structure anyway

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18:26 <andrewrk> there is always the nuclear option of calling the Allocator function pointers directly which allows for runtime known alignment

18:26 <andrewrk> I think that's probably not the best way to go tho

18:27 <ifreund> yeah that seems like a hack

18:27 <ifreund> we could also align all the allocations to the max alignment of the fields

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18:27 <ifreund> trade code bloat for heap bloat

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18:28 <ifreund> anyhow, I've got to go finish a paper that's due in 4 hours

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18:28 <ifreund> (it's been kinda fun though, I learned how the signal messaging protocol works)

18:29 <andrewrk> godspeed!

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20:18 <ikskuh> reasons why zig is awesome: @bitCast([4][4]f32, array_len_16)

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21:46 <johnLate> What does Auto in AutoHashMap mean exacly?

21:49 <ikskuh> it means that the hashing and equal function for the key type is automatically chosen

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21:51 <andrewrk> AutoHashMap is really comfy

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22:02 <johnLate> (looking at hash_map.zig) Is there any other reason for the "return struct { fn foo(...){...} }.foo;" pattern than not wanting to change the grammar and not wanting to define that function outside the containing one?

22:04 <ifreund> johnLate: that pattern only exists because #1717 hasn't been implemented yet

22:04 <johnLate> thx

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