eternal_iterator

This Rust crate provides EternalIterator trait, which promises that the iterator iterates forever.

let mut it = core::iter::repeat(123_i32).map(|i| i * 2)
		.enumerate().skip(5).step_by(2).zip(core::iter::once(3).chain(10..));
assert_eq!(it.next_eternal(), ((5, 246), 3));
assert_eq!(it.next_eternal(), ((7, 246), 10));
assert_eq!(it.next(), Some(((9, 246), 11)));
assert_eq!(it.next_eternal(), ((11, 246), 12));

generating fixed-size array

You can initialize arbitrary fixed-size array with eternal_iterator.

use eternal_iterator::prelude::*;
let arr: [i32; 5] = (0..).next_array();
assert_eq!(arr, [0, 1, 2, 3, 4]);