define itetrator for user defined type

[aseemgoyal]

The following piece of code uses iterator, but i am not able to understand why it is correct.

According to http://en.cppreference.com/w/cpp/iterator/iterator , iterator it itself a class. So, what is the code below trying to do?

Note : the code is for implementing vector class.

The related line number is 7 and 24.

 template <class T>
class  Vector
{
public:

    // what is this??
    typedef T* iterator;

    Vector();
    Vector(unsigned int size);
    Vector(unsigned int size, const T & initial_value); //why
    Vector(const Vector<T> & v);  // why
    ~Vector();

    T & back();
    void push_back(const T & value);
    void pop_back();


private:
    unsigned int my_size;
    unsigned int my_capacity;
    
    T * buffer;  // this will be replaced to iterator buffer?
};

[LB]

In C++, pointers meet all the requirements of iterators, so they can be used as iterators.