Bit field vs Bitset

Question

I want to store bits in an array (like structure). So I can follow either of the following two approaches

Approach number 1 (AN 1)

struct BIT
{
   int da         


        

Answer 1

Approach number 1 will most likely be compiled as an array of 4-byte integers, and one bit of each will be used to store your data. Theoretically a smart compiler could optimize this, but I wouldn't count on it.

Is there a reason you don't want to use std::bitset?