From e89ef72aac916bc66f08be5563d334123cc1d4c5 Mon Sep 17 00:00:00 2001
From: Camil Staps
Date: Mon, 9 Feb 2015 20:22:32 +0100
Subject: week 2 camil

---
 week2/camil/TupleOverloading.icl | 48 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 week2/camil/TupleOverloading.icl

(limited to 'week2/camil/TupleOverloading.icl')

diff --git a/week2/camil/TupleOverloading.icl b/week2/camil/TupleOverloading.icl
new file mode 100644
index 0000000..bdc8c18
--- /dev/null
+++ b/week2/camil/TupleOverloading.icl
@@ -0,0 +1,48 @@
+implementation module TupleOverloading
+
+import StdEnv
+
+instance +    (a,b)   | + a & + b                where
+	+ (a,b) (c,d) = (a+c,b+d)
+instance +    (a,b,c) | + a & + b & + c          where
+	+ (a,b,c) (d,e,f) = (a+d,b+e,c+f)
+
+instance -    (a,b)   | - a & - b                where
+	- (a,b) (c,d) = (a-c,b-d)
+instance -    (a,b,c) | - a & - b & - c          where
+	- (a,b,c) (d,e,f) = (a-d,b-e,c-f)
+
+instance *    (a,b)   | * a & * b                where
+	* (a,b) (c,d) = (a*c,b*d)
+instance *    (a,b,c) | * a & * b & * c          where
+	* (a,b,c) (d,e,f) = (a*d,b*e,c*f)
+
+instance /    (a,b)   | / a & / b                where
+	/ (a,b) (c,d) = (a/c,b/d)
+instance /    (a,b,c) | / a & / b & / c          where
+	/ (a,b,c) (d,e,f) = (a/d,b/e,c/f)
+
+instance zero (a,b)   | zero a & zero b          where
+	zero = (zero, zero)
+instance zero (a,b,c) | zero a & zero b & zero c where
+	zero = (zero, zero, zero)
+
+instance one  (a,b)   | one a & one b            where
+	one = (one, one)
+instance one  (a,b,c) | one a & one b & one c    where
+	one = (one, one, one)
+
+instance ~    (a,b)   | ~ a & ~ b                where
+	~ (a,b) = (~ a, ~ b)
+instance ~    (a,b,c) | ~ a & ~ b & ~ c          where
+	~ (a,b,c) = (~ a, ~ b, ~ c)
+
+Start  = (test (1,2), test (1,2,3))
+
+test a = ( zero + a == a    && a    == a + zero
+         , a - zero == a    && a    == ~ (zero - a)
+         ,  one * a == a    && a    == a * one
+         , zero * a == zero && zero == a * zero
+         ,  a / one == a
+         ,  ~ (~ a) == a
+         )
-- 
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