Public function taking private class as parameter

Question

Assuming I have this code:

class MyClass {
private:    
    class NestedPrivClass {};
public:
     MyClass(NestedPrivClass){}
};

Is there a way for another class to create an instance of MyClass by calling the public constructor?

Shouldn't using private nested class as parameters in public functions be a compilation error? (As it is impossible to call them.)

Answer 1

No, this should not be an error. Just because the name is private does not mean it is an invalid type. For instance if we added a public static function that returns a NestedPrivClass like

class MyClass {
private:    
    class NestedPrivClass {};
public:
     MyClass(NestedPrivClass){}
     static NestedPrivClass getNestedPrivClass() { return NestedPrivClass{}; }
};

We could then construct a object of MyClass like

int main()
{
    auto private_name = MyClass::getNestedPrivClass();
    MyClass foo{private_name};
}