title: Why is there no std::stou?
body: <p>C++11 added some new string conversion functions:</p>
  
  <p><a href="http://en.cppreference.com/w/cpp/string/basic_string/stoul" rel="noreferrer">http://en.cppreference.com/w/cpp/string/basic_string/stoul</a></p>
  
  <p>It includes stoi (string to int), stol (string to long), stoll (string to long long), stoul (string to unsigned long), stoull (string to unsigned long long). Notable in its absence is a stou (string to unsigned) function. Is there some reason it is not needed but all of the others are?</p>
  
  <p>related: <a href="https://stackoverflow.com/questions/7895583/no-stoshort-unsigned-short-functions-in-c11">No &quot;sto{short, unsigned short}&quot; functions in C++11?</a></p>