Friend classes across different namespaces. Is that possible

Question

I\'m having problems trying to use the friend feature of C++. I have these interfaces:

#pragma once
#include \"Mesh3D.h\"
#include 
namespace t         


        

Answer 1

I guess you need to remove following code in the second file:

#include "GeometryManager.h"

class CGeometryManager3D;

The first line causes circular inclusion as the comments in the question suggests;

The second line declares a totally irrelevant class as it is in the global name space;