Access private variable of class defined in header from class defined in source file

Question

Header.h

#pragma once

namespace
{
    class B;
}

namespace n1
{
    namespace n2
    {
        class A
        {
        private:
            int i;

        public:
            friend class B;
        };
    }
}

Source.cpp

#include <stdio.h>
#include "Header.h"

class B
{
public:
    void Run();
};

void B::Run()
{
    n1::n2::A a;
    a.i;
}

int main()
{
    B b;
    b.Run();
}

As we can see from above Class A is defined in header file while class B is defined in source file. I want to access private member of Class A from Class B::run(). I am not able to find the way to do this.

Answer 1

you are forward declaring class B in anonymous namespace

take out class B forward declaration out of the namespace and it should work

like this:

#pragma once

class B;


namespace n1
{
    namespace n2
    {
        class A
        {
        private:
            int i;

        public:
            friend class B;
        };
    }
}