I find the existence of this book a real curiosity. I know that GCC will handle Objective C but how many people ever use it in that mode? That is a serious question because ACCU has always been open to including material on this language and no one has ever provided any.

Unlike the other books in this series, it is just possible that this one could enable someone to experiment a little with Objective C with GCC (this book covers 3.1) before deciding if they want to know more.