main.rs

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

impl Point {
  fn origin() -> Point {
    Point { x: 0.0, y: 0.0 }
  }

  fn new(x: f64, y: f64) -> Point {
    Point { x, y }
  }
}

struct Rectangle {
  p1: Point,
  p2: Point,
}

impl Rectangle {
  fn area(&self) -> f64 {
    let Point { x: x1, y: y1 } = self.p1;
    let Point { x: x2, y: y2 } = self.p2;
    ((x2 - x1) * (y2 - y1)).abs()
  }
  fn perimeter(&self) -> f64 {
    let Point { x: x1, y: y1 } = self.p1;
    let Point { x: x2, y: y2 } = self.p2;
    2.0 * ((x1 - x2).abs() + (y1 - y2).abs())
  }
  fn translate(&mut self, x: f64, y: f64) {
    self.p1.x += x;
    self.p2.x += x;
    self.p1.y += y;
    self.p2.y += y;
  }
}

struct Pair(Box<i32>, Box<i32>);

impl Pair {
  fn destroy(self) {
    let Pair(first, second) = self;
    println!("Destroy pair({},{})", first, second);
  }
}

fn main() {
  let rectangle = Rectangle {
    p1: Point::origin(),
    p2: Point::new(3.0, 4.0),
  };
  println!("Rectangle perimeter: {}", rectangle.perimeter());

  let mut square = Rectangle {
    p1: Point::origin(),
    p2: Point::new(1.0, 2.0),
  };

  square.translate(2.0, 2.0);


  let pair = Pair(Box::new(1), Box::new(2));
  pair.destroy();
}