Function getBitsAt

tests/utils/linalg.cpp:67–76

qindex getBitsAt(qindex num, vector<int> inds) {
    DEMAND( num >= 0 );

    qindex out = 0;

    for (size_t i=0; i<inds.size(); i++)
        out |= getBitAt(num, inds[i]) << i;
    
    return out;
}


qindex setBitAt(qindex num, int ind, int bit) {