Question

有限度支持操作符重载。可重载操作符信息，查阅标准库 std::ops 、 std::cmp 文档。

use std::ops::Add;

#[derive(Debug)]
struct Data {
  x: i32
}

impl Add for Data {
  type Output = Self;  // Add.Output

  fn add(self, other: Self) -> Self {
    Self { x: self.x + other.x }
  }
}

/* ------------------------------------- */

fn main() {
  let d = Data{ x: 1 } + Data{ x: 2 };
  assert_eq!(d.x, 3);
}

泛型版本。

use std::ops::Add;

#[derive(Debug)]
struct Data<T> {
  x: T
}

impl<T> Add for Data<T> where T: Add<Output = T> {
  type Output = Self;

  fn add(self, other: Self) -> Self {
    Self { x: self.x + other.x }
  }
}

fn main() {
  let d = Data{ x: 1 } + Data{ x: 2 };
  assert_eq!(d.x, 3);

  let d = Data{ x: 1.1 } + Data{ x: 2.2 };
  assert_eq!(d.x, 3.3);
}