Yeah, I meant things like sample code for plain C frameworks, where the author has just decided "hey, why not do this in Obj-C++ instead of Obj-C." As I recall, many of the AudioToolbox examples are like this.
Didn't mean to imply that there's no place for Obj-C++, just that it's not good style if you don't actually need it (like to wrap a C++ lib).
Here's one heuristic: if you see any Objective C++ files (*.mm) in the project, you can probably ignore it as an example of good style.