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Rust traits act as generic constraints

(Jin Qing's Column, Nov. 18, 2021)

Rust traits are different from interfaces of C++/Java/Go.

See: https://stevedonovan.github.io/rustifications/2018/09/08/common-rust-traits.html

Rust traits are mechanism for adding behavior to types.

Traits have 2 modes. One is interface as Java.

Another is generic constraint. Generic functions are defined over types that implemented specific traits.

The "complie-time duck typing" in C++ templates is avoided in Rust. Rust will reject a type with quack() method as a Duck type. We must pass a type which implements Duck trait. But in Go, a type with quack() method is sufficient to be used as a Duck interface.

 

posted on 2021-11-18 12:51 金庆 阅读(60) 评论(0)  编辑 收藏 引用 所属分类: 8. Rust

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