Module System

Code

// mod.rs or main.rs
mod network {
    pub mod server {
        pub fn start() {
            println!("Server starting...");
            connect("localhost");
        }

        fn connect(addr: &str) {
            println!("Connecting to {}", addr);
        }
    }

    pub mod client {
        use super::server; // Access parent module

        pub fn send() {
            println!("Sending data...");
        }
    }
}

// Import with use
use network::server;
use network::client;

// Re-export
pub use network::server::start as run_server;

// External crate
// use std::collections::HashMap;

fn main() {
    server::start();
    client::send();
    run_server();

    // Nested path
    use std::io::{self, Read, Write};

    // Glob import
    // use std::collections::*;
}

Explanation

mod defines modules; pub controls visibility; use imports paths; super/crate/self reference relative paths.

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