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September 15, 2024 09:32
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Rust iterators
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| pub struct RectIter { | |
| points: Vec<(f64, f64)>, | |
| idx: usize, | |
| } | |
| impl Iterator for RectIter { | |
| type Item = (f64, f64); | |
| /* | |
| * The reason why is mutable (&mut self), is that the only way to iterate through something, | |
| * is that the underline iterator has to be mutable, bacause you have to be able to change | |
| * the state until you are at the end. | |
| */ | |
| fn next(&mut self) -> Option<Self::Item> { | |
| if self.idx >= self.points.len() { | |
| return None; | |
| } | |
| let point = self.points[self.idx]; | |
| self.idx += 1; | |
| return Some(point); | |
| } | |
| } |
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