lib/nullptr.h

   1 #define GCC_VERSION (__GNUC__ * 10000 \
   2                                                            + __GNUC_MINOR__ * 100 \
   3                                                            + __GNUC_PATCHLEVEL__)
   4
   5 #if GCC_VERSION < 40600
   6 #define nullptr 0
   7 #endif