title: Get the last element of a std::string
body: <p>I was wondering if there's an abbreviation or a more elegant way of getting the last character of a string like in:</p>
  
  <pre><code>char lastChar = myString.at( myString.length() - 1 );
  </code></pre>
  
  <p>Something like <code>myString.back()</code> doesn't seem to exist. Is there an equivalent?</p>