如何在 rust 中使用多个文件？

Question

How to use multiple files in rust?
My main code is in file1.rs . file2.rs runs the main function of file1.rs multiple times, that's why I want to split it into 2 files, to keep my code clean. Than I just want to run the main function of file2.rs in my main.rs file. (I'm using the latest version of rust - 2021)

Folder structure:

├── Cargo.lock  
├── Cargo.toml  
├── src  
│  ├── main.rs  
│  └── file1.rs
|  └── file2.rs
└── target  

main.rs

pub mod file1;
pub mod file2;

pub fn main() {
    file2::main();
}

file2.rs

pub mod file1;

pub fn main() {
    file1::func("Bob");
    file1::func("Alice");
}

file1.rs

pub fn func(name: &str) {
    println!("Hello {}", name.to_string());
}

I get this error message:

file not found for module `file1`
to create the module `file1`, create file "src/file2/file1.rs"
or "src/file2/file1/mod.rs" rustcE0583

Answer 1

You need to make the main functions public using pub fn main() {...} . Also, the syntax you used to call the file1::main is invalid, you would have to provide actual values like 1 and "foo" .

Answer 2

Here you are saying that file2.rs has a module called file1, so your tree should be:

src
 |
  ---- main.rs
  ---- file2.rs
  ---- file2
        |
        ----- file1.rs

Or change it to:

main.rs:

pub mod file1;
pub mod file2;

// ...

file2.rs:

// pub mod file1

// ...

Answer 3

You can import from other modules (files) in the same directory:

use super::file2::*;