stack_dst

Stack-allocated dynamically-sized types

Overview

This crate provides a simple way of returnings DSTs up to a certain size without requiring a heap allocation.

Basic usage

This crate provides two types - Value (which is a fixed-size allocation for a single DST), and Stack (a fixed-size buffer for multiple DSTs arranged in a LIFO stack.

Example

One of the most obvious uses is to allow returning capturing closures without having to box them. In the example below, the closure takes ownership of value, and is saved to a StackDST

use stack_dst::Value as StackDST;

fn make_closure(value: u64) -> StackDST<dyn Fn()->String> {
    StackDST::new(move || format!("Hello there! value={}", value)).ok().expect("Closure doesn't fit")
}
let closure = make_closure(12);
assert_eq!( closure(), "Hello there! value=12" );

Status

• Works for most test cases
• Not rigourously tested across platforms

Minimum rust version

• Uses MaybeUninit, so requires at least 1.36

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

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.