Ok, so this is a hard problem to explain.

I'm trying to create a namespace that will be accessible from 2 places.
1) A script (could be multiple scripts at once)
2) The inner workings of the actual engine

Both of these things are all c++.

My attempt at this problem is to create a .h file as follows
extern.h

#ifndef EXTERN_H
#define EXTERN_H

namespace MyExtern{ int testME; }

#endif

I then include my extern.h multiple times within the inner-workings of the engine and within my scripts.

I'm confused on why I'm getting a multiple definition of `MyExtern::testME' error, within the inner-workings of the engine .cc files where i include this .h file.