What's the correct way to return either an u8 on error or void from main?
#returning errors from main?
unreal oriole
(Sorry if that sounds really stupid, I've been trying for the past few minutes and gave up)
hot ridge
wdym?
you can return an error with !void
if it errors it'll exit with exit code 1
custom exit codes require the use of u8 or !u8
or std.os.exit :)
unreal oriole
you can return an error with `!void`
How?
hot ridge
here's an example ig:
(untested)
pub fn main() u8 {
myFunctionThatCanError() catch |err| return switch (err) {
error.Amongus => 420,
error.Bruh => 69,
else => 1,
};
return 0;
}
custom exit code per-error ^
unreal oriole
When I do
pub fn main() !u8 {
failingFunction() orelse return 1;
}
I get "expected type ..., got void"
How can I return either void or an u8?
hot ridge
When I do
```
pub fn main() !u8 {
failingFunction() orelse return 1;
}
```
I...
make sure to add a return at the end
hot ridge
How can I return either void or an u8?
you can't from main
hot ridge
main only allows returning void, !void, u8, or !u8 iirc
np
not sure why you'd want void or a u8 tho
unreal oriole
...How do I return an error from !void?
hot ridge
return error.MyError
hot ridge
pub fn myFunctionThatCanError() !void {
return error.MyError;
}
I mean you just return the error
MyError being the error name
unreal oriole
what is MyError
hot ridge
it's a name
unreal oriole
what name
hot ridge
oh wait i might get your confusion
okay so
- errors can't contain/carry values
- errors are named
whenever you create an error it's added to the global error set
unreal oriole
Okay, which names can I use?
hot ridge
anything you want
unreal oriole
this works now!
pub fn main() !void {
const sus = createAmogus() orelse return error.AmogusError;
}
oops I'm dumb
hot ridge
i don't think orelse works with errors, you'd have to use catch
unreal oriole
i don't think orelse works with errors, you'd have to use catch
Okay.
Thanks.
Sorry, the concept of returning errors that aren't numeric from main confused me