char* filename = "test.digits";    
    std::ifstream f(filename);
    std::vector<int>v;
    std::copy(std::istream_iterator<int>(f), std::istream_iterator<int>(), std::back_inserter(v));
    //check
    std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, "\n"));