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Clarify box (#448)

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Alexey Sokolov 2023-02-22 15:08:50 +00:00 committed by GitHub
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src/std/box.md
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@ -31,7 +31,7 @@ from `T` directly on a `Box<T>`][2].
<details>
* `Box` is like `std::unique_ptr` in C++.
* `Box` is like `std::unique_ptr` in C++, except that it's guaranteed to be not null.
* In the above example, you can even leave out the `*` in the `println!` statement thanks to `Deref`.
* A `Box` can be useful when you:
* have a type whose size that can't be known at compile time, but the Rust compiler wants to know an exact size.