Return multiple values from a function

Help
1

Is there a simple way to return multiple values from a function, via (for example) an anonymous struct or a tuple?
(I feel like I ought to know the answer to this but I’ve been away from Zig for a while and can’t remember, or find anything),

2

These are the only ways I know of:

const std = @import("std");

fn arrayMultiVal() [2]u8 {
    return .{ 0, 1 };
}

fn structMultiVal() struct { x: u8, y: u8 } {
    return .{ .x = 0, .y = 1 };
}

pub fn main() void {
    const amv = arrayMultiVal();
    std.log.info("{} {}", .{ amv[0], amv[1] });
    const smv = structMultiVal();
    std.log.info("{} {}", .{ smv.x, smv.y });
}
1 Like
3

I used this link to write the following:

const std = @import("std");
const Tuple = std.meta.Tuple;
const SomeTuple = Tuple(&.{u32, bool});

fn returnsTuple() SomeTuple {
    return .{
        @as(u32, 7),
        @as(bool, true),
    };
}

pub fn main() void {
    const x = returnsTuple();
    std.log.info("{}", .{x});
}

Works as expected.

2 Likes
4

Thanks, both - exactly what I was looking for! Both approaches look useful for different scenarios. I don’t think I can mark both as answers so I’ll mark the first one, but thanks both.