multiversx_sc_codec/
transmute.rs

1use alloc::{boxed::Box, vec::Vec};
2
3#[inline(never)]
4pub fn boxed_slice_into_vec<T>(mut bs: Box<[T]>) -> Vec<T> {
5    let l = bs.len();
6    if l == 0 {
7        return Vec::new();
8    }
9    let ptr = &mut bs[0] as *mut T;
10    core::mem::forget(bs);
11    unsafe { Vec::from_raw_parts(ptr, l, l) }
12}
13
14#[inline(never)]
15pub fn vec_into_boxed_slice<T>(v: Vec<T>) -> Box<[T]> {
16    v.into_boxed_slice()
17}
18
19#[cfg(test)]
20pub mod tests {
21    use super::*;
22
23    #[test]
24    fn test_boxed_slice_into_vec_0() {
25        let bs = Box::<[u8]>::from([]);
26        let v = boxed_slice_into_vec(bs);
27        assert_eq!(v, Vec::<u8>::new());
28    }
29
30    #[test]
31    fn test_boxed_slice_into_vec_1() {
32        let bs = Box::<[u8]>::from([1, 2, 3]);
33        let v = boxed_slice_into_vec(bs);
34        assert_eq!(v, [1u8, 2, 3].to_vec());
35    }
36
37    #[test]
38    fn test_vec_into_boxed_slice_0() {
39        let v = Vec::<u8>::new();
40        let bs = vec_into_boxed_slice(v);
41        assert_eq!(bs, Box::<[u8]>::from([]));
42    }
43
44    #[test]
45    fn test_vec_into_boxed_slice_1() {
46        let v = [1u8, 2, 3].to_vec();
47        let bs = vec_into_boxed_slice(v);
48        assert_eq!(bs, Box::<[u8]>::from([1, 2, 3]));
49    }
50}
multiversx_sc_codec/transmute.rs

multiversx_sc_codec/
transmute.rs
