30 Oct
2010
30 Oct
'10
10:55 a.m.
Hi, Below are two questions on commutative operations in Haskell. infixl 5 `com` com :: Int -> Int -> Int x `com` y = (x + y) commutative com a b = (a `com` b) == (b`com`a) -- 1 + 3 == 3 + 1 -- This gives true by virtue of the value of LHS and RHS being equal after the plus operation -- Question 1 -- commutative com 1 3 -- This also gives true. Is it because of commutative equation or because of the plus operation? -- Question 2 -- In Haskell can commutativity be specified as a property of infix operations? This message has been scanned for content and viruses by the DIT Information Services E-Mail Scanning Service, and is believed to be clean. http://www.dit.ie