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Clarification on references

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This commit is contained in:
Marko Zagar 2023-01-12 18:57:33 +01:00
parent 529d4bf20c
commit 6bda89f34e
1 changed files with 12 additions and 3 deletions
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src/basic-syntax/references.md
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@ -11,9 +11,18 @@ fn main() {
} }
``` ```
Some differences from C++: Some notes:
* We must dereference `ref_x` when assigning to it, similar to C pointers, * We must dereference `ref_x` when assigning to it, similar to C and C++ pointers.
* Rust will auto-dereference in some cases, in particular when invoking * Rust will auto-dereference in some cases, in particular when invoking
methods (try `count_ones`). methods (try `ref_x.count_ones()`).
* References that are declared as `mut` can be bound to different values over their lifetime. * References that are declared as `mut` can be bound to different values over their lifetime.
<details>
Key points:
* Be sure to note the difference between `let mut ref_x: &i32` and `let ref_x:
&mut i32`. The first one represents a mutable reference which can be bound to
different values, while the second represents a reference to a mutable value.
</details>