Question

I wanted to define a class in lisp its very simple in the c++ the code would be something like this

    class intersection{
    int distance;
    int fuel;
    char node1;
    char node2;
};

how can i write this in lisp and define objects from it
Thank you

Answer 1

Use the Common Lisp Object System, a part of ANSI Common Lisp.

(defclass intersection-class ()
  ((distance :type integer)
   (fuel     :type integer)
   (node1    :type character)
   (node2    :type character)))

CL-USER 69 > (make-instance 'intersection-class)
#<INTERSECTION-CLASS 4020002C2B>