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並前往https://stackoverflow.com/questions/31903461/automatically-derive-add-mul-ord-etc-for-a-numeric-type

Automatically derive Add, Mul, Ord, etc. for a numeric type

This needs rust in the 2018 edition extern crate derive_more; use derive_more::{Add, Mul}; #[derive(Add, Mul)] struct Centimeters(i32); ...

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