title: Preferred conversion from char (not char*) to std::string
body: <p>I have a <code>char</code>, a plain old character, that I would like to turn into an <code>std::string</code>.  <code>std::string(char)</code> doesn't exist of course.  I could create a char array and copy it in, I could go through string streams, or many other little roundabout routes.  Currently, I prefer <code>boost::lexical_cast</code>, but even that seems too verbose for this simple task.  So what's the preferred way?</p>