Convert bool array to int32 ,unsigned int and double?

Question

I\'ve bool arrays of sizes : 32, 48, 64 (each boolean represents a bit). how can I convert them to a number with a good performance( int, unsigned int, double48, double64)?

Answer 1

template 
T make_number (bool ar[], size_t ar_size) {
    T ret {};

    for (size_t i = 0; i < ar_size; ++i) {
        T s {ar[i]};
        s <<= i;
        ret |= s;
    }

    return ret;
}


int main (int, char**) {


    bool ar1[] = {1, 1, 1, 1, 0, 1};
    bool ar2[] = {1, 1, 1, 1, 1, 1, 1, 1};
    bool ar3[] = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0};
    bool ar4[] = {1, 1, 1, 1, 1, 1, 1, 1,
                  1, 1, 1, 1, 1, 1, 1, 1,
                  1, 1, 1, 1, 1, 1, 1, 1,
                  1, 1, 1, 1, 1, 1, 1, 1,
                  1, 1, 1, 1, 1, 1, 1, 1,
                  1, 1, 1, 1, 1, 1, 1, 1,
                  1, 1, 1, 1, 1, 1, 1, 1,
                  1, 1, 1, 1, 1, 1, 1, 1};

    cout << static_cast (make_number (ar1, 6)) << endl;
    cout << static_cast (make_number (ar2, 8)) << endl;
    cout << make_number (ar3, 16) << endl;
    cout << make_number (ar4, 64) << endl;

    return 0;
}

And the output:

47
255
32767
18446744073709551615