Do you need information on using Xcode to write standard C++ programs (example: you're taking a C++ programming course) or do you need information on writing Mac applications in C++?
If you need information on using Xcode to write standard C++ programs, I have an
article that walks you through the creation of a simple C++ program in Xcode.
I don't know of any tutorials for writing Mac applications in C++. You either have to use Cocoa, writing your user interface code in Objective C and your other code in C++, or you have to learn Carbon. There are no up-to-date books in Carbon.