View difference between Paste ID: szbFM5q4 and

-
+#include <iostream>
 #include <vector>
 #include <tuple>
 
 template <class T, class Y>
 class zipper {
 	class iterator {
 	public:
 		iterator(typename T::iterator tIt, typename Y::iterator yIt) : tIt(tIt), yIt(yIt) {}
 		bool operator==(const iterator &i) {
 			return (tIt==i.tIt || yIt==i.yIt);
 		}
 		std::tuple<typename T::value_type&, typename Y::value_type&> operator*() {
 			return std::forward_as_tuple(*tIt, *yIt);
 		}
 		iterator& operator++() {
 			++tIt;
 			++yIt;
 			return *this;
 		}
 		iterator operator++(int) {
 			iterator tmp = *this;
 			++*this;
 			return tmp;
 		}
 		bool operator!=(const iterator &i) {
 			return (tIt!=i.tIt && yIt!=i.yIt);
 		}
 	private:
 		typename T::iterator tIt;
 		typename Y::iterator yIt;
 	};
 	T& t;
 	Y& y;
 public:
 	zipper(T& t, Y& y) : t(t), y(y) {}
 	iterator begin() { return iterator(t.begin(), y.begin()); }
 	iterator end() { return iterator(t.end(), y.end()); }
 };
 
 template<class T, class Y>
 zipper<T,Y> zip(T& t, Y& y) { return zipper<T,Y>(t, y); }
 
 using namespace std;
 
 int main() {
 	vector<int> v{0,1,2};
 	vector<string> u{"five","four","three","two","one"};
 	for ( auto x : zip(u,v) ) {
 		cout << get<0>(x) << "\t" << get<1>(x) << endl;
 	}
 }
 
 /* Output:
  * "five    0"
  * "four    1"
  * "three   2"
  */