title: What is the preprocessor define for C++ language in Xcode precompile header?
body: <p>In my <code>Prefix.pch</code> file I am using <code>__OBJC__</code> preprocessor define for compilation of Objective C headers.  What is the equivalent for compilation of C++ headers?</p>
  
  <pre><code>#ifdef __OBJC__
      #import &lt;Foundation/Foundation.h&gt;
      #import &lt;UIKit/UIKit.h&gt;
  #endif
  </code></pre>