Re: [munich-lisp] multimethods, generic functions, multiple dispatch, ...

10 Sep 2005

      Christian.Schuhegger wrote @ Sat, 10 Sep 2005 10:07:09 +0200:
...
Andreas Hauser wrote:
...
Christian.Schuhegger wrote @ Sat, 10 Sep 2005 08:58:48 +0200:
You seem to have forgotten to show the actual Lisp code.
sorry :)
(defmethod do-shapes-collide-p ((shape1 Triangle) (shape2 Circle))
   (...))
(defmethod do-shapes-collide-p ((shape1 Circle)   (shape2 Triangle))
   (do-shapes-collide-p shape2 shape1))
(defmethod do-shapes-collide-p ((shape1 Triange)  (shape2 Square))
   (...))
...
And why don't you need:
(defmethod do-shapes-collide-p ((shape1 Circle) (shape2 Triangle))
?
...
and what do you do if you talk about vector objects and not pixel objects :)
It must be serialized somewhere (in Object World ?). Do the collision there.

But it seems Java can do methods with different sigantures:

public class foo
{
    public foo()
    {
    }

    public void bar(int i)
    {
        System.out.println(i + 1);
    }

    public void  bar(String s)
    {
        System.out.println(s + " world");
    }

    public static void main(String args[])
    {
        foo f = new foo();
        f.bar(12);
        f.bar("Hello");
    }
}

Andy