How to define modules outside of main/lib rs?

help
1

I have this file structure for my crate:

main.rs
fooA.rs
fooB.rs
fooShared.rs

and I'm using code from fooShared in both fooA and fooB, but not in main.

Now if I put mod fooShared; in main.rs, I can access fooShared from the other modules just fine.

However considering main is not a direct dependency of fooShared I would like to avoid having to define it main, but I haven't been able to figure out how to do this (or if its even possible), so any pointers would be appreciated.

2

Every module needs exactly one mod statement that can be found from main, but it doesn't need to appear directly there— it can be a submodule instead. You can, for example, structure your code like this:

// main.rs
mod foo;

fn main() {
    let a = foo::a::FooA::new();
    let b = foo::b::FooB::new();
}

// foo.rs
mod shared;
pub mod a;
pub mod b;

// foo/shared.rs
pub struct SharedFoo { ... }

// foo/a.rs
use super::shared::SharedFoo;
pub struct FooA { ... } 

// foo/b.rs
use super::shared::SharedFoo;
pub struct FooB { ... }
3

Ah true, I guess I was a bit too focused on having everything as standalone modules, thanks for the quick reply :slight_smile:

4

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