Mercurial > urweb
diff tests/type_class.ur @ 675:43430b7190f4
Type class inclusions
| author | Adam Chlipala <adamc@hcoop.net> |
|---|---|
| date | Thu, 26 Mar 2009 15:13:36 -0400 |
| parents | fab5998b840e |
| children | 81573f62d6c3 |
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--- a/tests/type_class.ur Thu Mar 26 14:37:31 2009 -0400 +++ b/tests/type_class.ur Thu Mar 26 15:13:36 2009 -0400 @@ -9,6 +9,11 @@ val option_default : t ::: Type -> default t -> default (option t) val pair_default : a ::: Type -> b ::: Type -> default a -> default b -> default (pair a b) + + class awesome + val awesome_default : t ::: Type -> awesome t -> default t + + val float_awesome : awesome float end = struct class default t = t fun get (t ::: Type) (x : t) = x @@ -18,6 +23,11 @@ fun option_default (t ::: Type) (x : t) = Some x fun pair_default (a ::: Type) (b ::: Type) (x : a) (y : b) = Pair (x, y) + + class awesome t = t + fun awesome_default (t ::: Type) (x : t) = x + + val float_awesome = 1.23 end open M @@ -27,6 +37,7 @@ val zero : int = default val some_zero : option int = default val hi_zero : pair string int = default +val ott : float = default fun frob (t ::: Type) (_ : default t) : t = default val hi_again : string = frob @@ -44,5 +55,5 @@ Pair (y, z) => "(" ^ show y ^ "," ^ show z ^ ")") fun main () : transaction page = return <xml><body> - {[hi_again]}, {[zero_again]}, {[some_zero]}, {[hi_zero]} + {[hi_again]}, {[zero_again]}, {[some_zero]}, {[hi_zero]}, {[ott]} </body></xml>