chernomor/ops4struct

Procedural macros to implements Add, AddAssign, Sub, SubAssing from std::ops for struct with named fields.

extern crate ops4struct;

use std::ops::Add;
use ops4struct::Add;

#[derive(Debug,PartialEq,Add,AddAssign,Sub,SubAssign)]
struct C {
    w: usize,
    r: u8,
}

fn main() {
    let a = C { w: 1, r: 0, };
    let b = C { w: 3, r: 4, };
    assert_eq!(C{w: 4, r: 4}, a+b);
}

Debug:

cargo install cargo-expand
cargo expand --example main