bumpish 0.1.0

A set of collections using bump allocations
Documentation 
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use super::*;
use crate::stk;

macro_rules! iter_methods {
    ($map_fn:expr) => {
        #[inline]
        fn next(&mut self) -> Option<Self::Item> {
            self.iter.next().map($map_fn)
        }

        #[inline]
        fn size_hint(&self) -> (usize, Option<usize>) {
            self.iter.size_hint()
        }

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

        #[inline]
        fn nth(&mut self, n: usize) -> Option<Self::Item> {
            self.iter.nth(n).map($map_fn)
        }

        #[inline]
        fn last(self) -> Option<Self::Item>
        where
            Self: Sized,
        {
            self.iter.last().map($map_fn)
        }
    };
}

pub struct Iter<'a, K, V> {
    iter: core::iter::Rev<stk::Iter<'a, Bucket<K, V>>>,
}

impl<'a, K, V> Iter<'a, K, V> {
    pub(super) fn new(entries: &'a Entries<K, V>) -> Self {
        Self {
            iter: entries.iter().rev(),
        }
    }
}

impl<'a, K, V> core::iter::Iterator for Iter<'a, K, V> {
    type Item = (&'a K, &'a V);

    iter_methods!(Bucket::as_tuple);
}

impl<'a, K, V> core::iter::DoubleEndedIterator for Iter<'a, K, V> {
    #[inline]
    fn next_back(&mut self) -> Option<Self::Item> {
        self.iter.next_back().map(Bucket::as_tuple)
    }
}

pub struct IterMut<'a, K, V> {
    iter: core::iter::Rev<stk::IterMut<'a, Bucket<K, V>>>,
}

impl<'a, K, V> IterMut<'a, K, V> {
    pub(super) fn new(entries: &'a mut Entries<K, V>) -> Self {
        Self {
            iter: entries.iter_mut().rev(),
        }
    }
}

impl<'a, K, V> core::iter::Iterator for IterMut<'a, K, V> {
    type Item = (&'a K, &'a mut V);

    iter_methods!(Bucket::as_tuple_mut);
}

impl<'a, K, V> core::iter::DoubleEndedIterator for IterMut<'a, K, V> {
    #[inline]
    fn next_back(&mut self) -> Option<Self::Item> {
        self.iter.next_back().map(Bucket::as_tuple_mut)
    }
}

pub struct Drain<'a, K: Eq, V> {
    core: &'a mut Core<K, V>,
}

impl<'a, K: Eq, V> Drain<'a, K, V> {
    pub(super) fn new(core: &'a mut Core<K, V>) -> Self {
        Self { core }
    }
}

impl<K: Eq, V> core::iter::Iterator for Drain<'_, K, V> {
    type Item = (K, V);

    fn next(&mut self) -> Option<Self::Item> {
        self.core.pop().map(Bucket::into_tuple)
    }
}

impl<K: Eq, V> core::ops::Drop for Drain<'_, K, V> {
    fn drop(&mut self) {
        while let Some(bucket) = self.core.pop() {
            drop(bucket);
        }
    }
}