Modular•4mo ago

Is it possible to convert an Int to a String at comp time?

Hey all, I'm trying to make some comp time friendly structs for my project. I'm struggling with converting an int to a string for some string concatenations. str() does not work at comp time. Minimal example to reproduce the error.

fn main() -> None:
    alias s = str(1)

fn main() -> None:
    alias s = str(1)

10 Replies

benny•4mo ago

well i guess my question would be, if it’s at comp time then you know the value, why not just use a string?

sora•4mo ago

I think this should work. Could you file an issue on GH

toasty•4mo ago

Here's an example of where it's blocking

@value
struct ANSIColor(Color, Stringable):
    """ANSIColor is a color (0-15) as defined by the ANSI Standard."""
    var value: Int

    fn sequence(self, is_background: Bool) -> String:
        var modifier: Int = 0
        if is_background:
            modifier += 10

        if self.value < 8:
            return str(modifier + self.value + 30)
        else:
            return str(modifier + self.value - 8 + 90)

@value
struct ANSIColor(Color, Stringable):
    """ANSIColor is a color (0-15) as defined by the ANSI Standard."""
    var value: Int

    fn sequence(self, is_background: Bool) -> String:
        var modifier: Int = 0
        if is_background:
            modifier += 10

        if self.value < 8:
            return str(modifier + self.value + 30)
        else:
            return str(modifier + self.value - 8 + 90)

I need to perform some operations with it as an Int, then return a String.

benny•4mo ago

got it, understood

toasty•4mo ago

I'll file an issue and see what happens, thanks! Wasn't sure if I was just doing something that doesn't make sense at comp time

benny•4mo ago

i agree that this is an issue but i also think there could be a workaround unsafe but maybe try creating a string with the necessary space then putting the correct values into the buffer for it not sure if that would work at comp time tho

toasty•4mo ago

Worth a try! I'm not too pressed to make it work immediately, but whenever it's possible it'll be nice time saver haha.

Three chickens in the green bag•4mo ago

Whats the issue number :)?

toasty•4mo ago

https://github.com/modularml/mojo/issues/2779

GitHub

[BUG] Mojo crashes when attempting run str() during compilation. ...

Bug description Running str() within in an alias causes the compiler to crash. I think we should be able to convert Stringables to String during compilation unless I'm missing something. Thanks...

ModularBot•4mo ago

Congrats @toasty, you just advanced to level 5!

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Is it possible to convert an Int to a String at comp time?