blob: 61d407e1d5c9ed17d64d0ff82750d5153c03593e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
% Deref coercions
<small>There is a new edition of the book and this is an old link.</small>
> Implementing the `Deref` trait allows us to customize the behavior of the _dereference operator_ `*`.
> By implementing `Deref` in such a way that a smart pointer can be treated like a regular reference, we can write code that operates on references and use that code with smart pointers too.
```rust
use std::ops::Deref;
# struct MyBox<T>(T);
impl<T> Deref for MyBox<T> {
type Target = T;
fn deref(&self) -> &T {
&self.0
}
}
```
---
Here are the relevant sections in the new and old books:
* **[in the current edition: Ch 15.02 — Treating Smart Pointers like Regular References with the `Deref` Trait][2]**
* <small>[In the first edition: Ch 3.33 — Deref coercions][1]</small>
[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/deref-coercions.html
[2]: ch15-02-deref.html
|
