title: c++ what is CharT element in string::size?
body: <p>From <a href="http://en.cppreference.com/w/cpp/string/basic_string/size" rel="noreferrer">http://en.cppreference.com/w/cpp/string/basic_string/size</a></p>
  
  <blockquote>
    <p>The number of <code>CharT</code> elements in the string.</p>
  </blockquote>
  
  <p>What is <code>CharT</code> element?</p>