make sure constructor/destructors are being called

tests/run/cpp_classes.pyx

 __doc__ = u"""
     >>> test_new_del()
+    (2, 2)
     >>> test_rect_area(3, 4)
     12.0
     >>> test_square_area(15)
@@ -23,11 +24,14 @@ cdef extern from "shapes.h" namespace shapes:
     cdef cppclass Square(Rectangle):
         int side
         # __init__(int) # need function overloading
+        
+    int constructor_count, destructor_count
 
 def test_new_del():
     cdef Rectangle *rect = new Rectangle(10, 20)
     cdef Circle *circ = new Circle(15)
     del rect, circ
+    return constructor_count, destructor_count
 
 def test_rect_area(w, h):
     cdef Rectangle *rect = new Rectangle(w, h)

tests/run/shapes.h

@@ -3,11 +3,15 @@
 
 namespace shapes {
     
+    int constructor_count = 0;
+    int destructor_count = 0;
+    
     class Shape
     {
     public:
         virtual float area() = 0;
-        virtual ~Shape() { }
+        Shape() { constructor_count++; } 
+        virtual ~Shape() { destructor_count++; }
     };
 
     class Rectangle : public Shape