Re: std::transformation. Not calling the function object?

it doesn't seem to be calling the function object although the
compilation depends on it. If someone could explain to me what I'm
doing incorrectly I'd appreciate it.

----------------------------
class StringToIntFuncObj
{
    public:
        int operator()(char ch)
        {
            std::cout << "HERE" << std::endl;
            //std::cout << "ch: " << ch << std::endl;
            //std::string str(my_str.substring(0,1));

            //int ret;
            //std::stringstream(str) >> ret;

            //return ret;
            return 1;
        }
    private:
};

int main(int argc, char *argv[])
{
    std::string string_rep = "12";

    std::vector<int> poly_rep(string_rep.size());
    poly_rep.resize(string_rep.size());

    StringToIntFuncObj stoi;

    std::transform(string_rep.begin(), string_rep.end(),
poly_rep.begin(),stoi);

    for( int i = 0; i < poly_rep.size(); i++)
                std::cout << poly_rep[i] << std::endl;

    return EXIT_SUCCESS;
}
----------------------------------------------------------

The output will be:
12
2

My goal is to take a string of numbers & place the digits in a vector
of ints.

I don't understand what's happening.