Rust

6244 readers

16 users here now

Welcome to the Rust community! This is a place to discuss about the Rust programming language.

Wormhole

[email protected]

Credits

The icon is a modified version of the official rust logo (changing the colors to a gradient and black background)

founded 2 years ago

MODERATORS

struct in Rust (lemmy.ca)

submitted 4 weeks ago by [email protected] to c/rust

5 comments fedilink hide all child comments

Hello,

I learned about struct in Rust, so I just wanted to share what I have learned.

what is struct in Rust? It's the same as what's in C language. eg,

struct Point {
    x: i32,
    y: i32,
}

that's it this is how we define a struct. we can create all sort of struct with different data types. ( here I have used only i32 but you can use any data type you want)

now Rust also have which we find in OOPs languages like Java. it's called method. here is how we can define methods for a specific struct in Rust.

impl Point {
    fn print_point(&self) {
        println!("x: {} y: {}", self.x, self.y);
    }
}

see it's that easy. tell me if I forgot about something I should include about struct in Rust.

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 18 points 4 weeks ago (1 children)

Maybe one thing to add, in addition to methods, you can also have associated functions, by leaving out the &self parameter:

impl Point {
    fn new(x: i32, y: i32) -> Point {
        Point { x, y }
    }
}

You call this function like so: Point::new(3, 5)

The example is quite deliberate. Most of the time, these associated functions are used for constructing the type itself, especially if you need to do more complex things for that than just initialize the struct. At that point, you don't have an object yet, so you couldn't be taking it as &self anyways. 🙃

[–] [email protected] 1 points 3 weeks ago

In other languages, these are usually called static methods. Rust just uses these instead of constructor methods. That way you never have to work with a partially initialized value - you just create the value in your new function once you've initialized all its fields.