Automatically implement traits of enclosed type for Rust newtypes (tuple structs with one field)

Question

In Rust, tuple structs with only one field can be created like the following:

struct Centimeters(i32);

I want to do basic arithmetic with <

Answer 1

I made the derive_more crate for this problem. It can derive lots of traits for structs of which the elements implement them.

You need to add derive_more to your Cargo.toml. Then you can write:

#[macro_use]
extern crate derive_more;

#[derive(Clone, Copy, Debug, PartialEq, Eq, Add)]
struct Centimeters(i32);

fn main() {
    let a = Centimeters(100);
    let b = Centimeters(200);
    assert_eq!(a + a, b);
}