wav 1.0.1

This project is no longer maintained (and wasn't a very well implemented project to begin with), use `hound` instead
Documentation 
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pub(crate) struct PairIter<T> {
    a: Option<T>,
    b: Option<T>,
}

impl<T> PairIter<T> {
    pub(crate) fn new(pair: (T, T)) -> Self {
        Self {
            a: Some(pair.0),
            b: Some(pair.1),
        }
    }
}

impl<T> Iterator for PairIter<T>
where
    T: Copy,
{
    type Item = T;

    fn next(&mut self) -> Option<Self::Item> {
        match self.a {
            Some(a) => {
                self.a = None;
                Some(a)
            }
            None => match self.b {
                Some(b) => {
                    self.b = None;
                    Some(b)
                }
                None => None,
            },
        }
    }
}

pub(crate) struct TripletIter<T> {
    a: Option<T>,
    b: Option<T>,
    c: Option<T>,
}

impl<T> TripletIter<T> {
    pub(crate) fn new(triplet: (T, T, T)) -> Self {
        Self {
            a: Some(triplet.0),
            b: Some(triplet.1),
            c: Some(triplet.2),
        }
    }
}

impl<T> Iterator for TripletIter<T>
where
    T: Copy,
{
    type Item = T;

    fn next(&mut self) -> Option<Self::Item> {
        match self.a {
            Some(a) => {
                self.a = None;
                Some(a)
            }
            None => match self.b {
                Some(b) => {
                    self.b = None;
                    Some(b)
                }
                None => match self.c {
                    Some(c) => {
                        self.c = None;
                        Some(c)
                    }
                    None => None,
                },
            },
        }
    }
}

pub(crate) struct QuadrupletIter<T> {
    a: Option<T>,
    b: Option<T>,
    c: Option<T>,
    d: Option<T>,
}

impl<T> QuadrupletIter<T> {
    pub(crate) fn new(quadruplet: (T, T, T, T)) -> Self {
        Self {
            a: Some(quadruplet.0),
            b: Some(quadruplet.1),
            c: Some(quadruplet.2),
            d: Some(quadruplet.3),
        }
    }
}

impl<T> Iterator for QuadrupletIter<T>
where
    T: Copy,
{
    type Item = T;

    fn next(&mut self) -> Option<Self::Item> {
        match self.a {
            Some(a) => {
                self.a = None;
                Some(a)
            }
            None => match self.b {
                Some(b) => {
                    self.b = None;
                    Some(b)
                }
                None => match self.c {
                    Some(c) => {
                        self.c = None;
                        Some(c)
                    }
                    None => match self.d {
                        Some(d) => {
                            self.d = None;
                            Some(d)
                        }
                        None => None,
                    },
                },
            },
        }
    }
}