如何在 src 中布局我的 Rust 模块以便在我的应用程序中访问

Question

I have created a package structure but the compiler says it can't find my module. I am new to rust, with a background in Java & C#

I have tried using self and super prefixes but can't get the code to compile

I have the following structure:

src
|_lib.rs
|_common
| |_mod.rs
| |_service.rs
|
|_animals
  |_mod.rs
  |_domestic
  | |_mod.rs
  | |_dog.rs
  |_wild
  |_mod.rs

here are the simplified files:

dog.rs

pub struct Dog {
  ...
}

impl Dog {
    ...
}

domestic > mod.rs

pub mod dog;

animals > mod.rs

pub mod domestic;
pub mod wild;

src > lib.rs

pub mod common;
pub mod animals;

common > service

use animals::domestic::dog;

From what I have read (and possibly misunderstood) in the Rust book, this should work.

But the compiler throws the following error:

could not find `animals` in `{{root}}`

Have I set this out in a 'Rust' way? and what do I need to change to get it to compile.

Thank you

Answer 1

In commons > service

use crate::animals::domestic::dog;

The crate keyword tells the compiler to start from the root of the package; ie what follows is an absolute path.

Alternatively, you can go with relative paths and use the super keyword to go one level up.

See this Rust book entry for details