How to convert a slice into an array reference?
They arrayref crate implements this.
Here's an example, you can of course use it in different ways:
#[macro_use]
extern crate arrayref;
/// Get the first 3 elements of `bytes` as a reference to an array
/// **Panics** if `bytes` is too short.
fn first3(bytes: &[u8]) -> &[u8; 3] {
array_ref![bytes, 0, 3]
}
As of Rust 1.34, you can use TryFrom
/ TryInto
:
use std::convert::TryFrom;
fn example(slice: &[u8]) {
let array = <&[u8; 3]>::try_from(slice);
println!("{:?}", array);
}
fn example_mut(slice: &mut [u8]) {
let array = <&mut [u8; 3]>::try_from(slice);
println!("{:?}", array);
}