Intro to Structs and Enums

Data Structuring

• Structure types e.g. struct { x: u8, y: char }

• Enumerated types e.g. enum { X, Y(char) }

Structs

• Fairly standard structure syntax with colons

    struct Point {
        x: u64,
        y: u64,
    }
  

  initialized as they look

    let p = Point { x: 12, y: 20 };
  

• Structs can have an "implementation"

    impl Point {
        fn x_coord(&self) -> u64 {
            self.x
        }
    }
  

  for OO-like syntax and vaguely OO semantics

    let px = p.x_coord()
  

• "Tuple structs" are a thing:

    struct Point(u64, u64);
  

Enums

• Fairly simple

    enum Color {
        Red,
        Green,
        Blue,
        Custom(f64, f64, f64),
    }
  

• "Disjoint union" / "sum type": value of this type is one of the above. Note that variants can contain values

    let c = Color::Custom(0.7,0.5,0.3)