C++ / Objective-C : The two files of a class are called Header and ...?

Question

In languages like C++ or Objective-C a class normally consist of two files. The first is called Header or Interface but what is the "official" name of the other file?

In some books it's just called "Codefile" in other "implementation file" or "message file" for Objective-C. Which name is the right name? I need to write a tutorials and I have no idea.

Answer 1

In C++, I always use these terms:
- "Header file" for the .h or .hpp file
- "Source file" for the .cpp or .cxx file
but I don't think there is a real official naming guideline