add smart pointers

add polymorphism
add destructor & copy constructor
add pointer-pointer

CPlusPlus/Classes/ICompareable.h

@@ -0,0 +1,13 @@
+#pragma once
+
+// only for demonstration
+#include <iostream>
+
+class ICompareable
+{
+public:
+	ICompareable() { std::cout << "ICompareable::ICompareable()" << std::endl; } // only for demonstration
+	virtual ~ICompareable() { std::cout << "ICompareable::~ICompareable()" << std::endl; } // only for demonstration
+
+	virtual int Compare(ICompareable* pOther) = 0;
+};