converting a bitset array to array of ints

You can use an std::bitset::operator[] to access the specifit bit. Keep in mind though, that [0] means the least significant bit, but we want to store them in the most significant -> least significant order, so we have to use the 7 - j instead of simply j:

#include <iostream>
#include <bitset>

int main()
{
    constexpr int SIZE = 5;
    std::bitset<8> bitArray[SIZE] = {3, 8, 125, 40, 13};
    int binArray[8 * SIZE];

    for(int i = 0, index = 0; i < SIZE; ++i){
        for(int j = 0; j < 8; ++j){
            binArray[index++] = bitArray[i][7 - j];
        }
    }
}

The binArrays content looks like so (newlines added by me to improve readability):

0 0 0 0 0 0 1 1
0 0 0 0 1 0 0 0
0 1 1 1 1 1 0 1
0 0 0 0 1 1 0 1