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rustrust-cargo

Rust constants in different modules?

I have this "main.rs" file which I declare a version constant. 

pub const VERSION: &'static str = "v2";
mod game;
fn main() {
   do_stuff();
}

Then I want to access this global constant in a different module "game.rs":

pub fn do_stuff() {
   println!("This is version: {}", VERSION);
}

How do I make the constant available everywhere?

Solution

  • As VERSION is declared in main.rs, which is a crate root, you can access it using its absolute path: crate::VERSION1.

    This should work:

    pub fn do_stuff() {
    println!("This is version: {}", crate::VERSION);
}

    1 In Rust 2015, ::VERSION could be used, but starting in Rust 2018, crate is required.