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% Borrow and AsRef
<small>There is a new edition of the book and this is an old link.</small>
> A cheap reference-to-reference conversion.
> Used to convert a value to a reference value within generic code.
```rust
fn is_hello<T: AsRef<str>>(s: T) {
assert_eq!("hello", s.as_ref());
}
```
---
This chapter does not exist in [the second edition][2].
The best place to learn more about this is [the Rust documentation][3].
* **[In the Rust documentation: `convert::AsRef`][3]**
* <small>[In the first edition: Ch 4.10 — Borrow and AsRef][1]</small>
[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/borrow-and-asref.html
[2]: index.html
[3]: ../std/convert/trait.AsRef.html
|
