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| struct TwoWayRange{ | |
| start: i32, | |
| end: i32, | |
| step: i32, | |
| current: i32 | |
| } | |
| enum TwoWayRangeError { | |
| ZeroStep | |
| } | |
| impl TwoWayRange { | |
| fn new(start: i32, end: i32, step: i32) -> Result<Self,TwoWayRangeError> { | |
| if step == 0 { | |
| return Err(TwoWayRangeError::ZeroStep); | |
| } | |
| Ok(Self { | |
| start, | |
| end, | |
| step, | |
| current: start | |
| }) | |
| } | |
| #[inline] | |
| fn do_step(&mut self) -> i32 { | |
| let before = self.current; | |
| self.current += self.step; | |
| return before; | |
| } | |
| } | |
| impl Iterator for TwoWayRange { | |
| type Item = i32; | |
| fn next(&mut self) -> Option<Self::Item> { | |
| if self.start > self.end { | |
| if self.current > self.end { | |
| Some(self.do_step()) | |
| } else { | |
| None | |
| } | |
| } else { | |
| if self.current < self.end { | |
| Some(self.do_step()) | |
| } else { | |
| None | |
| } | |
| } | |
| } | |
| } |
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