std::string s = "What is the right way to split a string into a vector of strings";
std::stringstream ss(s);
std::istream_iterator<std::string> begin(ss);
std::istream_iterator<std::string> end;
std::vector<std::string> vstrings(begin, end);
std::copy(vstrings.begin(), vstrings.end(), std::ostream_iterator<std::string>(std::cout, "\n"));

string s, tmp; 
stringstream ss(s);
vector<string> words;

// If there is one element (so komma) then push the whole string
if(getline(ss, tmp, ',').fail()) {
  words.push_back(s);
}
while(getline(ss, tmp, ',')){
    words.push_back(tmp);
}