A stack-allocated box that stores trait objects.

Last update: Dec 13, 2022

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Overview

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.

License

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.

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Comments

Fix unsoundness in the crate design
This PR fixes two types of unsoundness:

Box::new relied on the RVO, but the compiler doesn't guarantee this kind of optimization, therefore the memory buffer which stores the dyn Trait object can be moved after object construction what can break alignment. In this way, unfortunately, this PR removes this method.

AsRef <[u8] and AsMut <[u8]> can point to different memory locations, therefore this PR replaces the generic M parameter by the plain &mut [u8] reference.
opened by alekseysidorov 0

A stack-allocated box that stores trait objects.

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