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Update box.md (#363)

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Charisee Chiw 2023-02-09 12:55:19 -08:00 committed by GitHub
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@ -31,7 +31,9 @@ from `T` directly on a `Box<T>`][2].
<details> <details>
* `Box` is like `std::unique_ptr` in C++. * `Box` is like `std::unique_ptr` in C++.
* In the above example, you can even leave out the `*` in the `println!` statement thanks to `Deref`. * 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.
* want to transfer ownership of a large amount of data. To avoid copying large amounts of data on the stack, instead store the data on the heap in a `Box` so only the pointer is moved.
</details> </details>