Example

class MyClass
{
public:
friend int getA(MyClass& mc);

private:
int a;
};

int getA(MyClass& mc){
return mc.a;
}

Solution

Extend the class interface instead of using friend functions.

class MyClass
{
public:
int getA();

private:
int a;
};

int MyClass::getA(){
return MyClass::a;
}