From 42f92d56750ae7ad5d0c013a45c4318cd81dc1e7 Mon Sep 17 00:00:00 2001
From: Camil Staps
Date: Sat, 16 Dec 2017 16:24:13 +0100
Subject: Remove value from cashModel; add further explanation to gastje

---
 assignment-12/cashModel.icl | 14 +-------------
 assignment-12/gastje.icl    |  4 ++++
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/assignment-12/cashModel.icl b/assignment-12/cashModel.icl
index c9dfc55..d76b357 100644
--- a/assignment-12/cashModel.icl
+++ b/assignment-12/cashModel.icl
@@ -109,17 +109,5 @@ where
 Start = test fairness
 where
 	fairness :: [Product] Product -> Property
-	fairness ps p = value newps =.= value ps + value out
+	fairness ps p = euro newps =.= euro ps + euro out
 	where (newps, out) = model ps (Rem p)
-
-class value a :: (a -> Real)
-instance value Real where value = id
-instance value [a] | value a where value = sum o map value
-instance value Euro where value = \e -> toReal e.euro * 100.0 + toReal (sign e.euro * e.cent)
-instance value Product where value = value o euro
-instance value Action
-where
-	value = \a -> case a of
-		Add p -> value p
-		Rem p -> ~(value p)
-		Pay   -> 0.0
diff --git a/assignment-12/gastje.icl b/assignment-12/gastje.icl
index d3b20ce..62f9238 100644
--- a/assignment-12/gastje.icl
+++ b/assignment-12/gastje.icl
@@ -115,6 +115,10 @@ where
 
 	// This fails for 0; should be <=. If we fix that, the test does not
 	// terminate, as there are no 1000 integers with abs i < 10.
+	// Another option is to use:
+	//    holds (False ==> t) p = [{prop & bool=True} \\ prop <- holds t p]
+	// I.e., *do* count cases where the antecedent is False. However, that can
+	// give a wrong idea about the test coverage.
 	fac :: Int -> Int
 	fac n
 	| n < 0 = 1
-- 
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