title: C++ basic string exception
body: <p>If I just want to throw a string, isn't there a built in type somewhere so that I can just do </p>
  
  <pre><code>throw standard_exception("This is wrong!");
  </code></pre>
  
  <p>Or do I have to define such a standard exception that derives from exception myself? I know it is very simple to do so, I just thought this would be so common that it would be defined somewhere.</p>
  
  <p>Thanks</p>