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);
}
