Multiple inheritance: Wrong constructors being called?

Hi everyone,

I'm having some trouble getting the correct chain of constructors to be called when creating an object at the bottom of a hierarchy. Have a look at the code below - the inheritance goes like this:

  Shape
   |
   +-- Ellipse
        |
        +-- Circle

When I create a new Circle, it calls the Ellipse's constructor, which in turn calls the Shape's constructor. The problem is that I'm passing parameters to the constructors, and the Ellipse's constructor passes these parameters on to the Shape's constructor - but these parameters are ignored and the Shape's default constructor is called instead of the one taking parameters!

What am I doing wrong???

----------------------------------------------
#include <iostream>

class Shape
{
  public:
    Shape(void)
    {
      std::cout << "Default shape constructor, should be unused" << std::endl;
    }

    Shape(int width, int height)
    {
      std::cout << "Creating a new shape with size " << width << "x" << height << std::endl;
    }
};

class Ellipse: virtual public Shape
{
  public:
    Ellipse(int width, int height):
      Shape(width, height)
    {
      std::cout << "In Ellipse constructor, a shape with size should have already been created above" << std::endl;
    }
};

class Circle: virtual public Ellipse
{
  public:
    Circle(int width, int height):
      Ellipse(width, height)
    {
      std::cout << "In Circle constructor, Ellipse should already have been created above" << std::endl;
    }
};

int main(void)
{
  Circle *c = new Circle(10, 20);
  delete c;
  return 0;
}

----------------------------------------------

$ g++ -o test test.cpp && ./test

Default shape constructor, should be unused
In Ellipse constructor, a shape with size should have already been created above
In Circle constructor, Ellipse should already have been created above

----------------------------------------------

Thanks,
Adam.