Rust Modules

playground.rs

mod entities {
    //This module is public to anyone outside entities
    pub mod traits {
        pub trait Entity {
            fn id(&self) -> i32;
            fn title(&self) -> &str;
        }
    }
    
    //This module is private to anyone outside entities
    mod people {
        //We can use 'super' and 'self' to navigate through the module tree
        use super::traits::Entity;
        
        //The id and title fields on Person are only visible in the people module
        pub struct Person {
            id: i32,
            title: String
        }
        
        impl Person {
            pub fn new(id: i32, title: &str) -> Person {
                Person {
                    id: id,
                    title: title.to_string()
                }
            }
        }
        
        impl Entity for Person {
            fn id(&self) -> i32 {
                self.id
            }
            
            fn title(&self) -> &str {
                &self.title
            }
        }
    }
    
    //We can re-export module members with different visibility
    pub use self::people::*;
}

use entities::traits::*;
use entities::Person;

fn main() {
    let person = Person::new(1, "Jan");
    
    println!("{}: {}", person.id(), person.title());
}