e025: Traits Deep Dive, Part III
Closure traits, `impl trait`, `dyn trait`, and object safety!
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Links- RFC #1733: Trait Aliases
- RFC #255: Object Safety
- Ch. 17 in the Second Edition of The Rust Programming Language
- Huon Wilson’s post
You can see all of the pieces of the final example described in the show here (and the module has the required definitions for Point).
let points = vec![ Point { x: 1.0, y: 2.0 }, Point { x: 12.0, y: 4.3 }, Point { x: -5.4, y: 18.7 }, ]; let origin = Point::default(); // This is the version we start with. It works fine, but it's not elegant. let distances_inline: Vec<f32> = points .iter() .map(|point| { let change = point - &origin; (change.x.powi(2) + change.y.powi(2)).sqrt() }) .collect(); // This version is *much* cleaner! let distances_impl: Vec<f32> = points.iter().map(distance_from_impl(&origin)).collect(); Sponsors- Aaron Turon
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