Classes and inheritance now working as demonstrated by the classic SWIG class example

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@4527 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/csharp/class/runme.cs

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+// This example illustrates how C++ classes can be used from C# using SWIG.
+// The C# class gets mapped onto the C++ class and behaves as if it is a C# class.
+
+using System;
+
+public class runme
+{
+    static void Main() 
+    {
+        // ----- Object creation -----
+
+        Console.WriteLine( "Creating some objects:" );
+
+        using (Square s = new Square(10))
+        using (Circle c = new Circle(10))
+        {
+            Console.WriteLine( "    Created circle " + c );
+            Console.WriteLine( "    Created square " + s );
+
+            // ----- Access a static member -----
+
+            Console.WriteLine( "\nA total of " + Shape.nshapes + " shapes were created" );
+
+            // ----- Member data access -----
+
+            // Notice how we can do this using functions specific to
+            // the 'Circle' class.
+            c.x = 20;
+            c.y = 30;
+
+            // Now use the same functions in the base class
+            Shape shape = s;
+            shape.x = -10;
+            shape.y = 5;
+
+            Console.WriteLine( "\nHere is their current position:" );
+            Console.WriteLine( "    Circle = (" + c.x + " " + c.y + ")" );
+            Console.WriteLine( "    Square = (" + s.x + " " + s.y + ")" );
+
+            // ----- Call some methods -----
+
+            Console.WriteLine( "\nHere are some properties of the shapes:" );
+            Shape[] shapes = {c,s};
+            //            for (int i=0; i<shapes.Size; i++)
+            for (int i=0; i<2; i++)
+            {
+                Console.WriteLine( "   " + shapes[i].ToString() );
+                Console.WriteLine( "        area      = " + shapes[i].area() );
+                Console.WriteLine( "        perimeter = " + shapes[i].perimeter() );
+            }
+
+            // Notice how the area() and perimeter() functions really
+            // invoke the appropriate virtual method on each object.
+
+            // ----- Delete everything -----
+
+            Console.WriteLine( "\nGuess I'll clean up now" );
+
+        }
+        // Note: when this using scope is exited the C# Dispose() methods 
+        // are called which in turn call the C++ destructors
+
+        Console.WriteLine( Shape.nshapes + " shapes remain" );
+        Console.WriteLine( "Goodbye" );
+    }
+}