Question

I have no idea what to call it, so I have no idea how to search for it.

unsigned int odd : 1;

Edit:

To elaborate, it comes from this snippet:

struct bitField {
    unsigned int odd : 1;
    unsigned int padding: 15; // to round out to 16 bits
};

I gather this involves bits, but I’m still not all the way understanding.

Answer 1

They are bitfields. odd and padding will be stored in one unsigned int (16 bit) where odd will occupy the lowest bit, and padding the upper 15 bit of the unsigned int.