implement the pairs.cpp

Author: supermarkion

pairs.cpp

@@ -0,0 +1,57 @@
+// pairs.cpp -- defining and using a Pair template
+#include <iostream>
+#include <string>
+template <class T1, class T2>
+class Pair
+{
+private:
+	T1 a;
+	T2 b;
+public:
+	T1 & first();
+	T2 & second();
+	T1 first () const { return a; };
+	T2 second() const { return b; };
+	Pair(const T1 & aval, const T2 & bval) : a(aval), b(bval) { }
+	Pair() {}
+};
+
+template<class T1, class T2>
+T1 & Pair<T1, T2>::first()
+{
+	return a;
+}
+
+template<class T1, class T2>
+T2 & Pair<T1, T2>::second()
+{
+	return b;
+}
+
+int main()
+{
+	using std::cout;
+	using std::endl;
+	using std::string;
+	Pair<string, int> ratings[4] =
+	{
+		Pair<string, int>("The Purple Duck", 5),
+		Pair<string, int>("Jake's Frisco AI Fresco", 4),
+		Pair<string, int>("Mont Souffle", 5),
+		Pair<string, int>("Gertie's Eats", 3)
+	};
+
+	int joints = sizeof(ratings) / sizeof (Pair<string, int>);
+	cout << "Rating:\t Eatery\n";
+	for (int i = 0; i < joints; i++) {
+		cout << ratings[i].second() << ":\t"
+			<< ratings[i].first() << endl;
+	}
+	cout << "Opps! Revised rating:\n";
+	ratings[3].first() = "Gertie's Fab Eat";
+	ratings[3].second() = 6;
+	cout << ratings[3].second() << ":\t"
+		<< ratings[3].first() << endl;
+
+	return 0;
+}