Hello. As far as I know, the loop counter of for-loop using a range syntax is always usize: for (0..10) |i| {} // `i` is `usize` However, it is really annoying to downcast the counter to pass it to functions that take other types such as u32. Is there any easy ways to make the counter other type…

Hello @smallkirby There is no way to declare the range type. See why: Why are range variables always usize? - #2 by IntegratedQuantum There are two ways to loop: for and while. Cast to the desired type: for (0..10) |_i| { const i = @as(u32, @intCast(_i)); } Declare the desired type: var…

I can see I was being evil. In my defense I was only trying to get the code working. My MO is to get it compiled and working, then clean up the mess afterwards. My first post example did as you suggested. { for (0..10) |index|{ const index2:u8=@intCast(index); std.debug.print(…

[image] endlessly_amused: In my defense I was only trying to get the code working. It’s easy to forget all the casting rules/operators. s’all good ¯\_(ツ)_/¯

Thanks everyone. I understood that there’s no way to allow non-usize counter for a loop counter. So I’m going to use a downcast (truncate) or while loop instead. Thank you for your advices :slight_smile:

Give me a little bit longer almost got a solution for which you might be happy with and isn’t evil. Just got to put the guard rails in and write the tests.

Here is what I came up with … It’s a bit clunky. I am sure I can refine it. Please feel free to comment and improve. It accepts u8,u16 or u32 Example In the below example it counts to 0..3 in u8 using comptime. for ( countTo(@as(u8,3)) ) |item| {} Output zig run main_ziggit.zig (Evil laugh)…

Hi, @endlessly_amused . I really appreciate your answer, but I feel that typing countTo(@as(u8, 3)) is not so much simpler or easier than: for (0..3) |_i| { const i: u8 = @truncate(_i); }

[image] smallkirby: I really appreciate your answer, but I feel that typing countTo(@as(u8, 3)) is not so much simpler or easier than: for (0..3) |_i| { const i: u8 = @truncate(_i); } Go with what you feel comfortable with. And thanks for the feed back. However, having said that, it wa…

For anyone who is interested, here is my final piece of code to answer the question. Q) A For-loop, with a range syntax of (0..3), will use a usize type. Can we make it u23? A) This code will count to 3 in u23, using comptime. const top:u23=3; for (@"0.."(top)) |item| { std.debug…

while it’s cool that you can do such stuff in Zig, …I would still go with the while loop ^^ btw. this question was (one of the rare zig questions) on StackOverflow recently; Zig for loop range iterator with custom int type - Stack Overflow

This is clever, but please carefully consider the cost of doing this. This can cause calls to memset and increases the workload. This is also particularly rough if you try to count to anything large as it can also consume a lot of stack memory. Make sure to always look at the results of the assemb…

Ziggit

For-loop counter other than usize

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dude_the_builder June 17, 2024, 1:02pm 16

Range: a simple little numeric range iterator Showcase

With one additional line of code, you get: Control the type of iterated numeric values. var r = Range(i8){ .from = -2, .to = 2 }; while (r.next()) |i| { ... Ascending or descending iteration. var r = Range(i8){ .from = 2, .to = -2 }; while (r.next()) |i| { ... Control the iteration step. var r = Range(i8){ .from = -2, .to = 2, .step = 2 }; while (r.next()) |i| { ... Range over the values of a type. var r = Range(u4){ .inclusive = true }; while (r.next()) |i| { ... https://codeberg.o…

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