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pub mod combi; pub mod gen_range; pub struct RangeIterator { curr: i32, stop: i32, step: i32, } impl RangeIterator { pub fn new(start: i32, stop: i32, step: i32) -> Self { RangeIterator { curr: start, stop, step, } } } impl Iterator for RangeIterator { type Item = i32; fn next(&mut self) -> Option<Self::Item> { if self.curr >= self.stop { return None; } let res = self.curr; self.curr += self.step; Some(res) } } #[cfg(test)] mod tests { use super::*; #[test] fn it_works() { let mut m = 0; let it = RangeIterator::new(5, 12, 3); for s in it { m += s; } assert_eq!(m, 5 + 8 + 11); } }