smallvec 2.0.0-beta.2

'Small vector' optimization: store up to a small number of items on the stack
Documentation 
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use {
    super::{
        Allocator,
        SmallVec
    },
    core::{
        borrow::{
            Borrow,
            BorrowMut
        },
        ops::{
            Deref,
            DerefMut,
            Index,
            IndexMut
        },
        slice::SliceIndex
    }
};

impl<T, const N: usize, A: Allocator> Borrow<[T]> for SmallVec<T, N, A> {
    #[inline]
    fn borrow(&self) -> &[T] {
        self.as_slice()
    }
}
impl<T, const N: usize, A: Allocator> BorrowMut<[T]> for SmallVec<T, N, A> {
    #[inline]
    fn borrow_mut(&mut self) -> &mut [T] {
        self.as_mut_slice()
    }
}

impl<T, const N: usize, A: Allocator> AsRef<[T]> for SmallVec<T, N, A> {
    #[inline]
    fn as_ref(&self) -> &[T] {
        self.as_slice()
    }
}
impl<T, const N: usize, A: Allocator> AsMut<[T]> for SmallVec<T, N, A> {
    #[inline]
    fn as_mut(&mut self) -> &mut [T] {
        self.as_mut_slice()
    }
}

impl<T, const N: usize, A: Allocator> Deref for SmallVec<T, N, A> {
    type Target = [T];

    #[inline]
    fn deref(&self) -> &Self::Target {
        self.as_slice()
    }
}
impl<T, const N: usize, A: Allocator> DerefMut for SmallVec<T, N, A> {
    #[inline]
    fn deref_mut(&mut self) -> &mut Self::Target {
        self.as_mut_slice()
    }
}

impl<T, const N: usize, A: Allocator, I: SliceIndex<[T]>> Index<I> for SmallVec<T, N, A> {
    type Output = <I as SliceIndex<[T]>>::Output;

    #[inline]
    fn index(&self, index: I) -> &Self::Output {
        &self.deref()[index]
    }
}

impl<T, const N: usize, A: Allocator, I: SliceIndex<[T]>> IndexMut<I> for SmallVec<T, N, A> {
    #[inline]
    fn index_mut(&mut self, index: I) -> &mut Self::Output {
        &mut self.deref_mut()[index]
    }
}