Module show_notes::e018

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Borrow, AsRef, Deref: my head hurts now

Date: January 31, 2017
Subject: Three traits which are essential for designing good, Rustic APIs.
Audio

§Notes

Borrow, AsRef, and Deref are a little complicated, but they’re well-worth understanding. Together, they give you tools for dealing with everything from HashMap and friends to conversions involving smart pointer types to easily using String and str or Vec and slice together.

§Links

AsRef, Borrow, and Deref:
- Borrow and AsRef in The Rust Programming Language
- collections::borrow::Borrow
- std::convert::AsRef
- std::ops::Deref
persistent data structures
“Rust and Rest” – Arnin Roacher
sentry-cli
Particularly relevant previous episodes:

(Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!)

§Contact

New Rustacean:
- Twitter: @newrustacean
- Email: hello@newrustacean.com
Chris Krycho
- GitHub: chriskrycho
- Twitter: @chriskrycho

Structs§

HasAllTheImpls
Demonstrate borrowing the internal contents of the item.
NoImplsAtAll
A struct for showing that you cannot use Borrow, AsRef

Functions§

coerces_via_deref
Take the same type by Deref coercion at the call site.
takes_a_borrowable
Take it implementing Borrow<[u8]>.
takes_a_reference
Take it implementing AsRef<[u8]>. Note similarity to takes_a_borrowable.

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