Bitset in C++, about continuously add

Question

I want to add 1 value to the bitset until it over flows, I am wondering how to do this, like:

bitset<20> foo; (foo=00000 00000 00000 00000) how can we implement thi

Answer 1

You may use the following: http://ideone.com/C8O8Qe

template 
bool increase(std::bitset& bs)
{
    for (std::size_t i = 0; i != bs.size(); ++i) {
        if (bs.flip(i).test(i) == true) {
            return true;
        }
    }
    return false; // overflow
}

And then to iterate on all values :

std::bitset<20> bs;

do {
    std::cout << bs << std::endl;
} while (increase(bs));