If I define an inner class in C++, is it automatically a friend of the class that contains it? For example, is this legal:
class Outer {
public:
class Inner {
public:
void mutateOuter(Outer& o);
};
private:
int value;
};
void Outer::Inner::mutateOuter(Outer& o) {
o.value ++; // Legal? Or not?
}
I ask because on some compilers I've tried (VS2003) this code won't work, but I've heard at least anecdotally that it does work on some compilers. I can't find a relevant section in the C++ spec about this, and if anyone can cite something specific that would say that it is or is not legal that would be great.