count bits

count bits

template<unsigned char b>
struct ByteBits
{
    enum
    {
        COUNT = ((b >> 0) & 1) +
                ((b >> 1) & 1) +
                ((b >> 2) & 1) +
                ((b >> 3) & 1) +
                ((b >> 4) & 1) +
                ((b >> 5) & 1) +
                ((b >> 6) & 1) +
                ((b >> 7) & 1)
    };
};