Issue declaring extern class object

Question

Let me start by saying I\'ve extensively searched for answers on google and more specifically here.

The thing is I actually (at least I think I did) found people wit

Answer 1

1. You need to define the Player class, in your header file
2. Use extern to use variable that has an external linkage, and is already defined in some other file.

For example: you have file a.cpp, and inside this file has a global variable Player p. If you want to use the same exact instance p of Player in file c.cpp, then inside file c.cpp you write extern Player p.

I hope i made myself clear.