#include <iostream>
 
template<class T1,class T2>
struct A
{
    class iterator;
};
 
template<typename T1, typename T2>
struct A<T1, T2>::iterator {
public:
    iterator& operator++();
    iterator operator++(int);
 
};
 
// Prefix Increment (++i) operator overload
template<typename T1, typename T2>
typename A<T1, T2>::iterator&
    A<T1, T2>::iterator::operator++() {
    return *this;
}
 
int main()
{
    A<int,int> a;
    A<int,int>::iterator x;
    ++x;
}
 

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