Guile create functional class example

Examples/guile/class/runme.scm

@@ -1,6 +1,60 @@
+; file: runme.py
+
+; This file illustrates the proxy class C++ interface generated
+; by SWIG.
 
 (dynamic-call "scm_init_example_module" (dynamic-link "./libexample"))
 
-(format (current-error-port) "TODO: code to demonstrate the class example\n")
+; Convenience wrapper around the display function
+; (which only accepts one argument at the time)
+
+(define (mdisplay-newline . args)
+  (for-each display args)
+  (newline))
+
+; ----- Object creation -----
+
+(mdisplay-newline "Creating some objects:")
+(define c (new-Circle 10))
+(mdisplay-newline "    Created circle " c)
+(define s (new-Square 10))
+(mdisplay-newline "    Created square " s)
+
+; ----- Access a static member -----
+
+(mdisplay-newline "\nA total of " (Shape-nshapes) " shapes were created")
+
+; ----- Member data access -----
+
+; Set the location of the object
+
+(Shape-x-set c 20)
+(Shape-y-set c 30)
+
+(Shape-x-set s -10)
+(Shape-y-set s 5)
+
+(mdisplay-newline "\nHere is their current position:")
+(mdisplay-newline "    Circle = (" (Shape-x-get c) "," (Shape-y-get c) ")")
+(mdisplay-newline "    Square = (" (Shape-x-get s) "," (Shape-y-get s) ")")
+
+; ----- Call some methods -----
+
+(mdisplay-newline "\nHere are some properties of the shapes:")
+(define (shape-props o)
+  (mdisplay-newline "   " o)
+  (mdisplay-newline "   area      = " (Shape-area o))
+  (mdisplay-newline "   perimeter = " (Shape-perimeter o)))
+(for-each  shape-props (list c s))
+
+(mdisplay-newline "\nGuess I'll clean up now")
+
+; Note: this invokes the virtual destructor
+(delete-Shape c)
+(delete-Shape s)
+
+(define s 3)
+(mdisplay-newline (Shape-nshapes) " shapes remain")
+(mdisplay-newline "Goodbye")
 
 (exit 0)