Generic bit reader

main.rs

// Welcome to hell!

pub struct BitReader<T: Shr<usize> + BitAnd + PartialEq + From<u8> + Copy> {
    value: T,
    bits_remaining: usize
}

impl<T: Shr<usize> + BitAnd + PartialEq + From<u8> + Copy> BitReader<T>
    where <T as BitAnd>::Output: PartialEq<T>,
          T: From<<T as Shr<usize>>::Output> {
    pub fn new(value: T) -> Self {
        BitReader{
            value: value,
            bits_remaining: size_of::<T>()
        }
    }

    pub fn read_bit(&mut self) -> Option<bool> {
        if self.bits_remaining == 0 {
            None
        } else {
            self.bits_remaining -= 1;
            let result = (self.value & From::from(1u8)) == From::from(0);
            self.value = From::from(self.value >> 1usize);
            Some(result)
        }
    }
}