Rust結構
Rust結構
有三種類型的結構(「structs」),可以使用被struct
關鍵字創建 :
- 元組結構,這是命名爲元組的基礎。
- 典型的 C 結構
- 單元結構,這是無字段,對泛型有用。
// 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);
}
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