title: Is there a way to make pos_type and off_type to be an int64_t using traits?
body: <p>I am trying to understand what traits are, for example expressions like <code>typedef typename traits_type::off_type off_type</code> in the GNU implementation of <code>fstream</code>.</p>
  
  <p>This question came up when I was working with files larger than 2/4 GB. I found that recompiling the STL library, with the appropriate flags usually solves the large file issues.</p>