This is mostly done in lower level code, so no wonder you have never bumped into it. One easy example, though is passing a set of binary options around, which i

This is mostly done in lower level code, so no wonder you have never bumped into it. One easy example, though is passing a set of binary options around, which is useful, for example, when you want to say "enable those features, and disable those other features". You can pack up to 32 options into a 4-byte integer.