title: Source line length limit
body: <p>What's the maximum length of a source line <em>all</em> compilers are <em>required to</em> accept? Did it change in C++11? If so, what was the old value?</p>
  
  <p>I'm asking this question because I'm doing some heavy preprocessor voodoo (unfortunately, templates won't cut it), and doing so has a tendency to make the lines big very quickly. I want to stay on the safe side, so I won't have to worry about the possibility of compiler X on platform Y rejecting my code because of too long lines.</p>