raptorq 1.0.0

RaptorQ (RFC6330)
Documentation 
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#[derive(Clone)]
pub struct ArrayMap<T> {
    offset: usize,
    elements: Vec<Option<T>>,
}

impl<T: std::clone::Clone> ArrayMap<T> {
    pub fn new(start_key: usize, end_key: usize) -> ArrayMap<T> {
        ArrayMap {
            offset: start_key,
            elements: vec![None; end_key - start_key],
        }
    }

    pub fn insert(&mut self, key: usize, value: T) {
        self.elements[key - self.offset] = Some(value);
    }

    pub fn get(&self, key: usize) -> Option<&T> {
        self.elements[key - self.offset].as_ref()
    }

    pub fn get_mut(&mut self, key: usize) -> Option<&mut T> {
        self.elements[key - self.offset].as_mut()
    }

    pub fn keys<'s>(&'s self) -> impl DoubleEndedIterator<Item = usize> + 's {
        self.elements
            .iter()
            .enumerate()
            .filter_map(move |(i, elem)| match elem {
                Some(_) => Some(i + self.offset),
                None => None,
            })
    }
}

#[derive(Clone)]
pub struct UsizeArrayMap {
    offset: usize,
    elements: Vec<usize>,
}

impl UsizeArrayMap {
    pub fn new(start_key: usize, end_key: usize) -> UsizeArrayMap {
        UsizeArrayMap {
            offset: start_key,
            elements: vec![0; end_key - start_key],
        }
    }

    pub fn swap(&mut self, key: usize, other_key: usize) {
        self.elements.swap(key, other_key);
    }

    pub fn insert(&mut self, key: usize, value: usize) {
        self.elements[key - self.offset] = value;
    }

    pub fn get(&self, key: usize) -> usize {
        self.elements[key - self.offset]
    }

    pub fn decrement(&mut self, key: usize) {
        self.elements[key - self.offset] -= 1;
    }

    pub fn increment(&mut self, key: usize) {
        self.elements[key - self.offset] += 1;
    }
}

#[derive(Clone)]
pub struct BoolArrayMap {
    offset: usize,
    elements: Vec<bool>,
}

impl BoolArrayMap {
    pub fn new(start_key: usize, end_key: usize) -> BoolArrayMap {
        BoolArrayMap {
            offset: start_key,
            elements: vec![false; end_key - start_key],
        }
    }

    pub fn insert(&mut self, key: usize, value: bool) {
        self.elements[key - self.offset] = value;
    }

    pub fn get(&self, key: usize) -> bool {
        self.elements[key - self.offset]
    }
}