pub trait Sortable
{
    type Item;

    fn sort_by_key_b<Key, Func>(&mut self, func: Func)
    where
        Func: FnMut(&Self::Item) -> Key,
        Key: Ord;
}

impl<Item> Sortable for [Item]
{
    type Item = Item;

    fn sort_by_key_b<Key, Func>(&mut self, func: Func)
    where
        Func: FnMut(&Self::Item) -> Key,
        Key: Ord,
    {
        self.sort_by_key(func);
    }
}

impl<Item, const LENGTH: usize> Sortable for [Item; LENGTH]
{
    type Item = Item;

    fn sort_by_key_b<Key, Func>(&mut self, func: Func)
    where
        Func: FnMut(&Self::Item) -> Key,
        Key: Ord,
    {
        self.sort_by_key(func);
    }
}

impl<Item> Sortable for Vec<Item>
{
    type Item = Item;

    fn sort_by_key_b<Key, Func>(&mut self, func: Func)
    where
        Func: FnMut(&Self::Item) -> Key,
        Key: Ord,
    {
        self.sort_by_key(func);
    }
}