C/C++ existence confirmed

If you happen to ever title a StackOverlow question something like "How do I do (whatever) in C/C++", then I guarantee within a few short minutes someone will say "Which language? There is no such thing as C/C++.". I don't suggest arguing with them unless you like downvotes. That said--the C/C++ language does exist, and I'm probably one of the few people who sometimes studies it

http://blog.hostilefork.com/kinda-smart-pointers-in-c/

#ifdef __cplusplus

A C compiler is free to define that and a C++ compiler is free(?) not to define that.