Compiler error when including C++ code in the iPhone project

Question

Hi,

I'm trying to include some C++ code into my iPhone project and I'm getting the following compiler error:

"error:expected initializer before '<' token"

at this code construct:

  template<typename T, P_UINT_32 BEG, bool OQ, bool OVR, bool DBG>
  P_UINT_32 EKType<T, BEG, OQ, OVR, DBG>::getSizeX() const {
    return n;
  }

It looks like the XCode compiler is not recognizing this as a valid C++ syntax. I have named my C++ files with .h and .mm, and I've set the types of the files to sourcecode.cpp.h and sourcecode.cpp.cpp

Anyone has an idea as to why I'm getting this error?

Answer 1

You probably have the header being included by a .M file somewhere. It's amazing how these things can get pulled in, so make sure all of your .M files are renamed .MM.

Answer 2

You only need to name a file .mm if the file contains both Objective-C and C++.

If the file only contains C++, it should have the extension .cpp

If the file is a mix of ObjC and C++, then it should have the extension .mm and have its type set as sourcecode.cpp.objcpp

Answer 3

Are you sure that the source file you are trying to compile includes the declaration of the EKType class (or struct) and the declaration P_UINT_32?

I would think you'd get a similar error if the compiler wasn't aware of EKType or P_UINT_32.