use std::mem;

pub trait BitBlock {
    const ONE: Self;
    const ZERO: Self;

    fn bits() -> usize;
    fn count_ones(self) -> usize;
}

macro_rules! bit_block_impl {
    ($(($t: ty, $size: expr)),*) => ($(
        impl BitBlock for $t {
            const ONE: Self = 1;
            const ZERO: Self = 1;

            #[inline]
            fn bits() -> usize { $size }
            #[inline]
            fn count_ones(self) -> usize { self.count_ones() as usize }
        }
    )*)
}

bit_block_impl!{
    (u8, 8),
    (u16, 16),
    (u32, 32),
    (u64, 64),
    (usize, mem::size_of::<usize>() * 8)
}