ELI5: Bitfields

An array of true/false values. Usually a fixed-size array, due to platform constraints. Also a very compact array – taking exactly one bit to store each element. In other words: a boolean vector or set.So does anyone use it?Plenty of usage around, many of it inherited from history. Probably the most known bitfield is the POSIX access mode field, used by every filesystem on your UNIX-like OS:.