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diff lib/basis.urs @ 470:7cb418e9714f

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Tree demo works
author Adam Chlipala <adamc@hcoop.net>
date Thu, 06 Nov 2008 18:49:38 -0500
parents b393c2fc80f8
children 4154b4dc62c6
line wrap: on
line diff
--- a/lib/basis.urs	Thu Nov 06 17:09:53 2008 -0500
+++ b/lib/basis.urs	Thu Nov 06 18:49:38 2008 -0500
@@ -197,6 +197,11 @@
                  -> t ::: Type
                  -> sql_injectable t -> t -> sql_exp tables agg exps t
 
+val sql_is_null : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
+                  -> t ::: Type
+                  -> sql_exp tables agg exps (option t)
+                  -> sql_exp tables agg exps bool
+
 con sql_unary :: Type -> Type -> Type
 val sql_not : sql_unary bool bool
 val sql_unary : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}