{-# LANGUAGE ForeignFunctionInterface, TypeFamilies, MultiParamTypeClasses, 
             FlexibleInstances, TypeSynonymInstances, 
             EmptyDataDecls, ExistentialQuantification, ScopedTypeVariables #-}

-- module HROOT.Class.Interface where

module HROOT.Class.TFormula.Interface where


import Data.Word
import Foreign.ForeignPtr
import HROOT.TypeCast

import HROOT.Class.TFormula.RawType

import HROOT.Class.TNamed.Interface


class (ITNamed a) => ITFormula a where

    compile :: a -> String -> IO Int 

    clear :: a -> String -> IO () 

    definedValue :: a -> Int -> IO Double 

    eval :: a -> Double -> Double -> Double -> Double -> IO Double 

    evalParOld :: a -> [Double] -> [Double] -> IO Double 

    evalPar :: a -> [Double] -> [Double] -> IO Double 

    getNdim :: a -> IO Int 

    getNpar :: a -> IO Int 

    getNumber :: a -> IO Int 

    getParNumber :: a -> String -> IO Int 

    isLinear :: a -> IO Int 

    isNormalized :: a -> IO Int 

    setNumber :: a -> Int -> IO () 

    setParameter :: a -> String -> Double -> IO () 

    setParameters :: a -> [Double] -> IO () 

    setParName :: a -> Int -> String -> IO () 

    setParNames :: a -> String -> String -> String -> String -> String -> String -> String -> String -> String -> String -> String -> IO () 

    update :: a -> IO () 

instance Existable TFormula where
  data Exist TFormula = forall a. (FPtr a, ITFormula a) => ETFormula a

upcastTFormula :: (FPtr a, ITFormula a) => a -> TFormula
upcastTFormula h = let fh = get_fptr h
                       fh2 :: ForeignPtr RawTFormula = castForeignPtr fh
                   in cast_fptr_to_obj fh2