Rust 1.29.2

# Operators and Overloading

There is a new edition of the book and this is an old link.

> Rust does not allow you to create your own operators or overload arbitrary operators, but the operations and corresponding traits listed in `std::ops` can be overloaded by implementing the traits associated with the operator.

    use std::ops::Add;

    #[derive(Debug,PartialEq)]
    struct Point {
        x: i32,
        y: i32,
    }

    impl Add for Point {
        type Output = Point;

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

    fn main() {
        assert_eq!(Point { x: 1, y: 0 } + Point { x: 2, y: 3 },
                   Point { x: 3, y: 3 });
    }Run

Here are the relevant sections in the new and old books:

- In the second edition: Ch 19.03 — Advanced Traits, section Operator Overloading
- In the Rust documentation: `std::ops`
- In the first edition: Ch 3.32 — Operators and Overloading