Question

Can the volatile be used for class objects?
Like:

volatile Myclass className;

The problem is that it doesn’t compile,
everywhere when some method is invoked, the error says:
error C2662: ‘function’ : cannot convert ‘this’ pointer from ‘volatile MyClass’ to ‘MyCLass &’

What is the problem here and how to solve it?

EDIT:

class Queue {
            private:
                struct Data *data;
                int amount;
                int size;
            public:
                Queue ();
                ~Queue ();
                bool volatile push(struct Data element);
                bool volatile pop(struct Data *element);
                void volatile cleanUp();
            };
    .....
    volatile Queue dataIn;

        .....

    EnterCriticalSection(&CriticalSection);
    dataIn.push(element);
    LeaveCriticalSection(&CriticalSection);

Answer 1

Yes, you can, but then you can only call member functions that are declared volatile (just like the const keyword). For example:

 struct foo {
    void a() volatile;
    void b();
 };

 volatile foo f;
 f.a(); // ok
 f.b(); // not ok

---

Edit based on your code:

bool volatile push(struct Data element);

declares a non–volatile member function that returns a bool volatile (= volatile bool). You want

bool push(struct Data element) volatile;