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Saizan/gist:847437

Forked from DylanLukes/gist:847423
Created February 28, 2011 15:12
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gistfile1.hs
{-# LANGUAGE GADTs, EmptyDataDecls#-}
module Calculator where
type Stack = [Double]
data Arity = Unary | Binary
data Associativity = Left | Right
data Operator = Operator Arity Associativity
data Expr a where
Add :: Expr (Operator Binary Left)
Sub :: Expr (Operator Binary Left)
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Saizan commented Feb 28, 2011

{-# LANGUAGE GADTs, EmptyDataDecls#-}

module Calculator where

type Stack = [Double]

data Unary
data Binary
data Left
data Right
data Operator a b

data Expr a where
Add :: Expr (Operator Binary Left)
Sub :: Expr (Operator Binary Left)

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