1 files changed, 11 insertions, 1 deletions
diff --git a/src/commodities.lisp b/src/commodities.lisp
index 1302a98..6f8c65d 100644
--- a/src/commodities.lisp
+++ b/src/commodities.lisp
@@ -2,7 +2,8 @@
   (:use :cl)
   (:export :new-commodity
 		   :name
-		   :price))
+		   :price
+		   :commodity-eq))
 
 (in-package :commodities)
 
@@ -17,3 +18,12 @@
 	(make-instance 'commodity
 				   :name name
 				   :price price)))
+
+(defmethod print-object ((object commodity) stream)
+  (print-unreadable-object (object stream :type t)
+	(with-slots (name price) object
+	  (format stream "~a worth ~a" name price))))
+
+(defmethod commodity-eq ((c1 commodity) (c2 commodity))
+  (and (equal (name c1) (name c2))
+	   (= (price c1) (price c2))))