Parse string of words into set of words

Here is the function I am writing to parse a string of words into a set of words.

std::set parseStringToWords(string rawWord) {

getline(cin,rawWord);

istringstream iss(rawWord);
string word;
while(iss >> word) {

}

}

I'm pretty sure what I have is right so far, but I'm not sure what to do in the while loop. Any hints?