Well, since 0 is guaranteed to compare equal to the null pointer, my current code compare my pointers to it directly: if (ptr != 0) { foo(*ptr); } The type

Well, since 0 is guaranteed to compare equal to the null pointer, my current code compare my pointers to it directly: if (ptr != 0) { foo(*ptr); } The type mismatch is ugly, but that saves me an include (this particular code minimises its dependencies to maximise portability).