X-Git-Url: http://git.cielonegro.org/gitweb.cgi?p=hs-rrdtool.git;a=blobdiff_plain;f=Database%2FRRDtool%2FExpression.hs;fp=Database%2FRRDtool%2FExpression.hs;h=669acbca32adffa985f93c652b4e60cc5823f39e;hp=3a061676198ef76af9761365709456caa0de7eb5;hb=135df1a5d8a159db412614bcfc25634bee201f94;hpb=b7e8a37aa24e9bda11995613c45187e6e19e0c01

diff --git a/Database/RRDtool/Expression.hs b/Database/RRDtool/Expression.hs
index 3a06167..669acbc 100644
--- a/Database/RRDtool/Expression.hs
+++ b/Database/RRDtool/Expression.hs
@@ -50,11 +50,11 @@ class IsExpr e => IsAggregativeExpr e
 
 class (Show es, Eq es, HList es) => IsExprSet es
 instance IsExprSet HNil
-instance (IsExpr e, IsExprSet es) => IsExprSet (e :*: es)
+instance (IsExpr e, IsExprSet es) => IsExprSet (HCons e es)
 
 class (Show es, Eq es, HList es) => IsCommonExprSet es
 instance IsCommonExprSet HNil
-instance (IsCommonExpr e, IsCommonExprSet es) => IsCommonExprSet (e :*: es)
+instance (IsCommonExpr e, IsCommonExprSet es) => IsCommonExprSet (HCons e es)
 
 
 -- Constants and variable names
@@ -80,7 +80,7 @@ instance IsVarName vn => MentionedVars (Variable vn) where
 
 class HList vs => IsVariableSet vs
 instance IsVariableSet HNil
-instance (IsVarName v, IsVariableSet vs) => IsVariableSet (v :*: vs)
+instance (IsVarName v, IsVariableSet vs) => IsVariableSet (HCons v vs)
 
 -- Common operators
 data CommonUnaryOp a
@@ -173,7 +173,9 @@ data TrendOp vn a
     deriving (Show, Eq, Ord)
 instance (IsVarName vn, IsExpr a) => IsExpr (TrendOp vn a)
 instance (IsVarName vn, IsCommonExpr a) => IsCommonExpr (TrendOp vn a)
-instance (IsVarName vn, MentionedVars a) => MentionedVars (TrendOp vn a) where
+
+instance ( IsVariableSet (vn :*: MentionedVarsOf a)
+         ) => MentionedVars (TrendOp vn a) where
     type MentionedVarsOf (TrendOp vn a) = vn :*: MentionedVarsOf a
 
 data VariableShiftPredictOp ss w vn
@@ -184,8 +186,7 @@ instance (IsExprSet ss, IsExpr w, IsVarName vn)
     => IsExpr (VariableShiftPredictOp ss w vn)
 instance (IsExprSet ss, IsCommonExprSet ss, IsCommonExpr w, IsVarName vn)
     => IsCommonExpr (VariableShiftPredictOp ss w vn)
-instance ( IsVarName vn
-         , IsVariableSet (MentionedVarsOf ss :++: MentionedVarsOf w)
+instance ( IsVariableSet (vn :*: (MentionedVarsOf ss :++: MentionedVarsOf w))
          ) => MentionedVars (VariableShiftPredictOp ss w vn) where
     type MentionedVarsOf (VariableShiftPredictOp ss w vn)
         = vn :*: (MentionedVarsOf ss :++: MentionedVarsOf w)
@@ -202,8 +203,7 @@ instance (IsExpr sm, IsExpr w, IsVarName vn)
 instance (IsCommonExpr sm, IsCommonExpr w, IsVarName vn)
     => IsCommonExpr (FixedShiftPredictOp sm w vn)
 
-instance ( IsVarName vn
-         , IsVariableSet (MentionedVarsOf sm :++: MentionedVarsOf w)
+instance ( IsVariableSet (vn :*: (MentionedVarsOf sm :++: MentionedVarsOf w))
          ) => MentionedVars (FixedShiftPredictOp sm w vn) where
     type MentionedVarsOf (FixedShiftPredictOp sm w vn)
         = vn :*: (MentionedVarsOf sm :++: MentionedVarsOf w)