Static mutable array not working in Rust

Question

I have a global static array that I declared as a lookup table in Rust. For some odd reason I can't assign values to elements. It looks like this:

pub static mut WON_TABLE: &'static [u8] = &[0; 1000];

fn main () {
    for mov in 0..1000 {
        unsafe {
            WON_TABLE[mov as usize] = some_analyzer_function(mov);
        }
    }
}

For some reason this doesn't work and I keep getting the error:

error: cannot assign to immutable indexed content

Does anyone know why this is going on?

Joe Thomas · Accepted Answer · 2016-11-26 09:56:28Z

4

I just figured out the answer. I have to also declare the variables inside the array as mutable. I do this by changing:

pub static mut WON_TABLE: &'static [u8] = &[0; 1000];

to:

pub static mut WON_TABLE: &'static mut [u8] = &mut [0; 1000];

I hope this answer is useful to people who have similar problems in the future. If anyone else can expand on this, it'd be great! :D

answered Nov 26, 2016 at 9:56

Joe Thomas

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2 Comments

Shepmaster Over a year ago

I'd "expand" on it by don't do this. Global variables are a terrible idea. If you are going to do it, you might as well do it in a thread-safe manner.

Joe Thomas Over a year ago

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