Rust: struct

Andreas

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2 min read

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Jul 18, 2020

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Defining Struct

struct Car {
  name: String,
  door_count: u64
}

Instantiating Struct

let car1 = Car{
  name: String::from("car1"),
  door_count: 4
};// whole struct to mut, cannot mut only parts of the fields
let mut car2 = Car{
  name: String::from("car2"),
  door_count: 2
};

Accessing Struct’s Field

println!("{}", car1.name)

Struct Update Syntax

let car1 = Car{
  name: String::from("car1"),
  door_count: 4
};let car2 = Car{
  name: String::from("car2"),
  ..car1 // base struct must always be the last field
};

Field Init Shorthand

fn build_car(name: String) -> Car {
  Car {
    name,
    door_count: 4,
  }
}

Tupple Struct

struct RGBColor(i32, i32, i32);
let black = RGBColor(0, 0, 0);

Unit-like Struct

struct SomethingWithOnlyTrait{}

Quirks — “lifetimes” to store references

// error[E0106]: missing lifetime specifier
struct Person {
  name: &str
}fn main() {
  let john = Person{name: "John"};
  println!("{}", john.name);
}

Debugging Struct

fn main() {
  let p = Person{ name…