#include <cstdint>                                       //uint8_t
#include <cstdlib>                                       //std::malloc() / std::free() / std::calloc()

void f()
{
    uint8_t* bit_array = (uint8_t*)std::calloc(512); //filled with all zeros && sizeof(uint8_t) == 1
}

//temp = bit_array[i];                                   //from m == 7 to 0 with step --m
//temp |= 1 << m;                                        //  set bit
//temp &= ~(1 << m);                                     //reset bit