5 releases
0.2.3 | Oct 26, 2023 |
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0.2.2 | Oct 26, 2023 |
0.2.1 | Oct 26, 2023 |
0.2.0 | Oct 26, 2023 |
0.1.0 | Oct 26, 2023 |
#936 in Algorithms
76 downloads per month
Used in graphrs
8KB
108 lines
vec_to_array
Moves a heap allocated Vec
into a stack allocated array. In most cases you will want to prefer using try_into
(https://doc.rust-lang.org/alloc/vec/struct.Vec.html#impl-TryFrom%3CVec%3CT,+A%3E%3E-for-%5BT;+N%5D)
unless you need the array on stack for some reason.
let vec: Vec<i64> = vec![1, 2, 3];
let array: [i64; 3] = vec_to_array!(vec, i64, 3);
assert_eq!(array, [1, 2, 3]);
let vec: Vec<i32> = vec![1, 2, 3];
let array: Result<[i32; 3], VecToArrayError> = try_vec_to_array!(vec, i32, 3);
assert_eq!(array.unwrap(), [1, 2, 3]);
Motivation
For Vec
, Into
is not implement for arrays greater than a size of 12.
let v: Vec<i32> = vec![0; 768];
let arr: [i32; 768] = v.into(); /// will not compile
let v: Vec<i32> = vec![0; 768];
let arr: Result<[i32; 768], _ > = v.try_into(); /// Will work but is on the heap
Solution this crate adds vec_to_array!
and try_vec_to_array!
lib.rs
:
Moves a heap allocated Vec<T>
to an stack allocated array of type T
and size N
.