what is bit field in cpp?

Answer 1

I found this quite helpful, hope it helps you too ...

http://www.geeksforgeeks.org/bit-fields-c/

Answer 2

A field containing just 0s and 1s.

Answer 3

Declares a class data member with explicit size, in bits. Adjacent bit field members may be packed to share and straddle the individual bytes.

https://en.cppreference.com