Warning: the current language does not match this frame

This shows up i开发者_JS百科n the debugging console in Xcode. What does it mean and should I be concerned?

It generally means that you're debugging ObjC++ and that gdb has gotten confused about what language you're in the middle of. gdb often has trouble in ObjC++, which is one of many reasons to keep your C++ and ObjC separate as much as you can. A related error is along the lines of "No this pointer."