有三种类型的结构(“structs”)，可以使用被struct 关键字创建 :
| // A unit struct |
| struct Nil; |
| // A tuple struct |
| struct Pair(i32, f64); |
| // A struct with two fields |
| struct Point { |
| x: f64, |
| y: f64, |
| } |
| // Structs can be reused as fields of another struct |
| #[allow(dead_code)] |
| struct Rectangle { |
| p1: Point, |
| p2: Point, |
| } |
| fn main() { |
| // Instantiate a `Point` |
| let point: Point = Point { x: 0.3, y: 0.4 }; |
| // Access the fields of the point |
| println!("point coordinates: ({}, {})", point.x, point.y); |
| // Destructure the point using a `let` binding |
| let Point { x: my_x, y: my_y } = point; |
| let _rectangle = Rectangle { |
| // struct instantiation is an expression too |
| p1: Point { x: my_y, y: my_x }, |
| p2: point, |
| }; |
| // Instantiate a unit struct |
| let _nil = Nil; |
| // Instantiate a tuple struct |
| let pair = Pair(1, 0.1); |
| // Destructure a tuple struct |
| let Pair(integer, decimal) = pair; |
| println!("pair contains {:?} and {:?}", integer, decimal); |
| } |
