#box #reuse #move #replace #take


Allows for Boxs to have their values moved out and replaced with new values, while reusing the same allocation

2 releases

Uses old Rust 2015

0.1.1 Jun 1, 2017
0.1.0 Jun 1, 2017

#606 in Memory management

48 downloads per month


69 lines

Build Status Docs Status On crates.io

EmptyBox, a way to safely move values in and out of Boxs without


EmptyBox is similar to a statically checked Box<Option<T>>:

use empty_box::EmptyBox;

// A box with a string!
let boxed = Box::new("Hello!".to_string());

// Oh no, we don't like that string.
let (string, empty) = EmptyBox::take(boxed);

// Let's make an objectively superior string, and put it into the original
// box.
let superior = "Objectively superior string!".to_string();

// Now we have our superior string in the box!
let boxed = empty.put(superior); 

assert_eq!("Hello!", string);
assert_eq!("Objectively superior string!", &*boxed);

Creating an EmptyBox from a Box and then putting a T back into the EmptyBox will avoid allocating a new Box, instead reusing whatever old Box the T was EmptyBox::taken from.


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Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

No runtime deps