Add C++ nested class example

This also reverts the nested class additions to the Java/C# 'class' example
so that the 'class' example remains identical across different language modules

Examples/csharp/class/example.cxx

@@ -9,7 +9,7 @@ void Shape::move(double dx, double dy) {
   y += dy;
 }
 
-int Shape::Counter::nshapes = 0;
+int Shape::nshapes = 0;
 
 double Circle::area(void) {
   return M_PI*radius*radius;

Examples/csharp/class/example.h

@@ -2,19 +2,17 @@
 
 class Shape {
 public:
-  struct Counter{
-		static int nshapes;
-  };
   Shape() {
-    Counter::nshapes++;
+    nshapes++;
   }
   virtual ~Shape() {
-    Counter::nshapes--;
+    nshapes--;
   };
   double  x, y;   
   void    move(double dx, double dy);
   virtual double area(void) = 0;
   virtual double perimeter(void) = 0;
+  static  int nshapes;
 };
 
 class Circle : public Shape {

Examples/csharp/class/runme.cs

@@ -17,9 +17,9 @@ public class runme
             Console.WriteLine( "    Created circle " + c );
             Console.WriteLine( "    Created square " + s );
 
-            // ----- Access a static member of a nested class -----
+            // ----- Access a static member -----
 
-            Console.WriteLine( "\nA total of " + Shape.Counter.nshapes + " shapes were created" );
+            Console.WriteLine( "\nA total of " + Shape.nshapes + " shapes were created" );
 
             // ----- Member data access -----
 
@@ -60,7 +60,7 @@ public class runme
         // Note: when this using scope is exited the C# Dispose() methods 
         // are called which in turn call the C++ destructors
 
-        Console.WriteLine( Shape.Counter.nshapes + " shapes remain" );
+        Console.WriteLine( Shape.nshapes + " shapes remain" );
         Console.WriteLine( "Goodbye" );
     }
 }