Function array_tools::init_with_iter

pub fn init_with_iter<T, A, I>(iter: I) -> Option<A> where
    A: FixedSizeArray<T>,
    I: Iterator<Item = T>, 

Attempts to initialize array of T with iterator over T values.

• If iterator yields not enough items, this function returns None.
• If iterator yields enough items items to fill array, this function returns Some(array).
• If iterator yields excessive items, this function only takes required number of items and returns Some(array).

Panics

• Only if iterator's next method does.

Examples

use array_tools as art;

let mut iter = [3i32, 2, 1, 0].iter().copied();
let result: Option<[i32; 5]> = art::init_with_iter(iter.by_ref());

assert_eq!(result, None);
assert_eq!(iter.next(), None);

let mut iter = [4i32, 3, 2, 1, 0].iter().copied();
let result: Option<[i32; 5]> = art::init_with_iter(iter.by_ref());

assert_eq!(result, Some([4i32, 3, 2, 1, 0]));
assert_eq!(iter.next(), None);

let mut iter = [5i32, 4, 3, 2, 1, 0].iter().copied();
let result: Option<[i32; 5]> = art::init_with_iter(iter.by_ref());

assert_eq!(result, Some([5i32, 4, 3, 2, 1]));
assert_eq!(iter.next(), Some(0));
assert_eq!(iter.next(), None);