find_all

find_all is capable of finding all indexes of elements where a predicate is met and therefore aims to be a simple alternative with (nearly) identical interface to the find method (this difference being returning an Option<Vec<usize>> instead of Option<usize>)

```rust let testdata = [1, 2, 3, 4, 1, 1, 1, 1]; let indexes = findall::findall(testdata.iter(), |num: &i32| *num == 9); assert_eq!(indexes, None);

let indexes = findall::findall(testdata.iter(), |num: &i32| *num == 1); asserteq!(indexes, Some(vec![0,4,5,6,7])); ```

License: GPL-3.0-only