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use crate::ds::fixed_queue::FixedQueue; use crate::traits::Indicator; pub struct Max { period: u32, history: FixedQueue<f64>, } impl Max { pub fn new(period: u32) -> Max { Self { period, history: FixedQueue::new(period), } } fn get_max(&self) -> f64 { let mut max = self.history.at(0).unwrap(); for i in 0..self.history.size() as i32 { let elem=self.history.at(i).unwrap(); if elem > max { max = elem; } } return max; } } impl Indicator<f64, Option<f64>> for Max { fn next(&mut self, input: f64) -> Option<f64> { self.history.add(input); if self.history.is_full() { return Some(self.get_max()); }else{ return None; } } fn reset(&mut self) { self.history.clear(); } } #[cfg(test)] mod tests { use crate::fixed_queue::FixedQueue; use crate::math::max::Max; use crate::traits::Indicator; #[test] fn max_works() { let mut max = Max::new(5); assert_eq!(max.next(81.59), None); assert_eq!(max.next(81.06), None); assert_eq!(max.next(82.87), None); assert_eq!(max.next(83.00), None); assert_eq!(max.next(83.61), Some(83.61)); assert_eq!(max.next(83.15), Some(83.61)); assert_eq!(max.next(82.84), Some(83.61)); assert_eq!(max.next(83.99), Some(83.99)); assert_eq!(max.next(84.55), Some(84.55)); assert_eq!(max.next(84.36), Some(84.55)); assert_eq!(max.next(85.53), Some(85.53)); assert_eq!(max.next(86.54), Some(86.54)); assert_eq!(max.next(86.89), Some(86.89)); assert_eq!(max.next(87.77), Some(87.77)); assert_eq!(max.next(87.29), Some(87.77)); } }