Need C++ Source Code Example

I am using MagicDraw to reverse engineer C++ code to a Class diagram, to explain reverse engineering to my customer.  I have a simple C++ example with polygons I worked out to show the section of code that creates classes (3) then, shows those class names on a Class Diagram so, they can see it worked.  I now need more complex code that is compilable and has around 50 classes and 100 objects.