friend keyword

Friend keyword:
Lets a function acces members from a class,

Example:

#include <iostream>

using namespace std;

class FelixClass
{
public:
    FelixClass()
    {
        regVar = 0;
            }

private:
    int regVar;

    friend void printCrap(FelixClass &felixobject);

};

void printCrap(FelixClass &felixobject)
{
    felixobject.regVar = 99;
    cout << felixobject.regVar << endl;
}

int main()
{
    FelixClass felixobject2;
    printCrap(felixobject2);

    return 0;
}