chronologic 0.7.12

Time constraint reasoning (scheduling...)
Documentation 
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use std::iter::FusedIterator;
use crate::{TimePoint, Timestamp, Timestamped, TimeValue};
use crate::seq::{TimeSeqBackward, TimeSeqForward, TimeSequence};


impl Timestamped for TimeSeqForward {

    #[inline] fn timestamp(&self) -> Timestamp { self.t }
}

impl TimeSequence for TimeSeqForward
{
    fn new<T: Timestamped>(t: T, delta: TimeValue) -> Self
    {
        assert!(delta.is_strictly_positive(), "sequence interval should be strictly positive");
        let t = t.timestamp() - delta; // so we will start at t
        assert!(t.is_finite(), "infinite start value");
        Self { t, step: delta }
    }

    #[inline]
    fn reverse(self) -> impl TimeSequence
    {
        TimeSeqBackward { t: self.t, step: self.step }
    }

    #[inline]
    fn increment(&self) -> TimeValue { -self.step }

    #[inline]
    fn period(&self) -> TimeValue { self.step }

    fn len(&self) -> usize
    {
        if self.t.0.is_positive() {
            (i64::MAX - self.t.0.as_ticks()) as usize / self.step.as_ticks() as usize
        } else {
            (i64::MAX as usize) + (-self.t.0.as_ticks() as usize) / self.step.as_ticks() as usize
        }
    }
}

impl FusedIterator for TimeSeqForward { }


impl Iterator for TimeSeqForward {

    type Item = Timestamp;

    #[inline]
    fn next(&mut self) -> Option<Timestamp>
    {
        self.t += self.step;
        (!self.t.is_future_infinite()).then_some(self.t)
    }

    #[inline]
    fn size_hint(&self) -> (usize, Option<usize>)
    {
        let n = self.len();
        (n,Some(n))
    }

    #[inline]
    fn count(self) -> usize {
        self.len()
    }

    fn last(self) -> Option<Self::Item>
    {
        let n = self.len();
        (n > 0).then_some(self.t + n*self.step)
    }


    fn nth(&mut self, n: usize) -> Option<Self::Item>
    {
        if self.len() < n {
            self.t = Timestamp::INFINITE;
            None
        } else {
            self.t += self.step * n;
            Some(self.t)
        }
    }
}