A stack-allocated box that stores trait objects.

Related tags


Continuous integration Crates.io API reference


This crate allows saving DST objects in the provided buffer. It allows users to create global dynamic objects on a no_std environment without a global allocator.

use static_box::Box;

struct Uart1Rx {
    // Implementation details...

impl SerialWrite for Uart1Rx {
    fn write(&mut self, _byte: u8) {
        // Implementation details
let rx = Uart1Rx { /* ... */ };

let mut writer = Box::<dyn SerialWrite, [u8; 32]>::new(rx);
writer.write_str("Hello world!");

This implementation is inspired by the thin_box example in the rustc tests repository.

Minimum Supported rustc Version

This crate uses following unstable features:

In other words, the crate's supported nightly rustc version is 1.53.0, but there is no guarantee that this code will work fine on the newest versions.


Dual-licensed to be compatible with the Rust project.

Licensed under the Apache License, Version 2.0 http://www.apache.org/licenses/LICENSE-2.0 or the MIT license http://opensource.org/licenses/MIT, at your option. This file may not be copied, modified, or distributed except according to those terms.

Aleksey Sidorov
Software engineer
Aleksey Sidorov
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