This is a little awk script I wrote as a less intrusive alternative to my INLsplit C++ class management system. All it does is scan a list of C++ header files (.h) for function prototypes, and checks the corresponding C++ source file (.cc) for the definition of those functions. If the definition is missing from the .cc file, it will add it with an empty function body.
I make no guarantee that these programs won't garble the input and output files you feed them, erase your hard drive, and set your house on fire. Use them at your own risk. And always backup.
It's an awk script, so you can just save it by right-clicking on it, or something. Whatever.