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Write about cows 

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>
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Harsh Shandilya 2020-07-12 01:32:10 +05:30
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content/posts/simple-tricks-for-faster-rust-programs.md
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@ -36,9 +36,11 @@ Note that this alone is not guaranteed to be helpful, and a lot of programs see
## Cows!
Rustaceans [love their cows](https://www.reddit.com/r/rust/comments/8o1pxh/the_secret_life_of_cows/).
Rustaceans [love their cows](https://www.reddit.com/r/rust/comments/8o1pxh/the_secret_life_of_cows/). It's one of the most underrated APIs in the Rust stdlib. It's secret is relatively simple - it's a smart copy-on-write pointer. Or well, a smart clone-on-write pointer, as copy means something different in Rust.
Given a data wrapped in a `std::borrow::Cow`, you can avoid cloning the data if you only want immutable read access, which saves memory and improves runtime performance as well. Over a large codebase, these savings pile up to create a noticeable enough difference.
# References
- Pascal Hertleif's [blog](https://deterministic.space/) - He's a very popular and active Rust developer and writes amazing, insightful articles.
- Amos Wenger's [blog](https://fasterthanli.me) - Amos' articles often go over important topics like API design through a comparison angle between Rust and another language to highlight differences and benefits to each approach.
- Amos Wenger's [blog](https://fasterthanli.me) - Amos' articles often go over important topics like API design through a comparison angle between Rust and another language to highlight differences and benefits to each approach.