/* define */
struct User {
    username: String,
    email: String,
    sign_in_count: u64,
    active: bool,
}

/* tuple structs */
struct Color(i32, i32, i32);
struct Point(i32, i32, i32);

fn main() {
    /* create an instance */
    let mut user1 = User {
        email: String::from("someone@example.com"),
        username: String::from("someusername123"),
        active: true,
        sign_in_count: 1,
    };

    user1.email = String::from("anotheremal@example.com");

    /* update syntax */
    let user2 = User {
        email: String::from("another@email.com"),
        username: String::from("anotherusername567"),
        ..user1
    };

    let black = Color(0, 0, 0);
    let origin = Point(0, 0, 0);
}

fn build_user(email: String, username: String) -> User {
    User {
        email,  /* field init shorthad */
        username,
        active: true,
        sign_in_count: 1,
    }
}