title: Eclipse CDT C++ NULL not resolved
body: <p>Related: <a href="https://stackoverflow.com/questions/7433448/eclipse-cdt-symbol-null-could-not-be-resolved">Eclipse CDT &quot;Symbol NULL could not be resolved&quot;</a></p>
  
  <p>I was under the impression that <code>NULL</code> was a standard macro in C++ and didn't need any headers to be included.  Eclipse, on the other hand, thinks it doesn't exist.</p>
  
  <p>Is there some way to remind Eclipse that I'm in C++ mode not C mode for this file, and therefore to shut up about the NULL problem?</p>