How do you access enum values in Rust?

Question

struct Point {
    x: f64,
    y: f64,
}

enum Shape {
    Circle(Point, f64),
    Rectangle(Point, Point),
}

let my_shape = Shape::Circle(Point { x: 0.0, y: 0.0 },         


        

Answer 1

From The Rust Programming Language:

Another useful feature of match arms is that they can bind to parts of the values that match the pattern. This is how we can extract values out of enum variants.

[...]

fn value_in_cents(coin: Coin) -> u32 {
    match coin {
        Coin::Penny => 1,
        Coin::Nickel => 5,
        Coin::Dime => 10,
        Coin::Quarter(state) => {
            println!("State quarter from {:?}!", state);
            25
        },
    }
}

If you'd like to be able to write functions that are capable of working on multiple types with different representations, have a look at traits.