BROADCASTS.com

Published: July 5, 2018, 1:27 a.m.

Closure traits, `impl trait`, `dyn trait`, and object safety!

\nShow Notes\n

Sponsored by Parity Technologies! Parity is hiring Rust developers so if you\u2019re interested, you should check out their job listings!

\nLinks\n

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• RFC #1733: Trait Aliases
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• RFC #255: Object Safety
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• Ch. 17 in the Second Edition of The Rust Programming Language
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• Huon Wilson\u2019s post
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\nExample\n

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).

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let points = vec![\n    Point { x: 1.0, y: 2.0 },\n    Point { x: 12.0, y: 4.3 },\n    Point { x: -5.4, y: 18.7 },\n];\n\nlet origin = Point::default();\n\n// This is the version we start with. It works fine, but it's not elegant.\nlet distances_inline: Vec<f32> = points\n    .iter()\n    .map(|point| {\n        let change = point - &origin;\n        (change.x.powi(2) + change.y.powi(2)).sqrt()\n    })\n    .collect();\n\n// This version is *much* cleaner!\nlet distances_impl: Vec<f32> = points.iter().map(distance_from_impl(&origin)).collect();

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\nContact\n

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