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

-- module HROOT.Class.Interface where

module HROOT.Math.TRandom.Interface where


import Data.Word
import Foreign.C
import Foreign.Ptr
import Foreign.ForeignPtr
import FFICXX.Runtime.Cast

import HROOT.Math.TRandom.RawType

import HROOT.Core.TNamed.Interface
---- ============ ----



class (ITNamed a) => ITRandom a where

    getSeed :: a -> IO CInt 

    gaus :: a -> CDouble -> CDouble -> IO CDouble 

    setSeed :: a -> CInt -> IO () 

    uniform :: a -> CDouble -> CDouble -> IO CDouble 

instance Existable TRandom where
  data Exist TRandom = forall a. (FPtr a, ITRandom a) => ETRandom a

upcastTRandom :: (FPtr a, ITRandom a) => a -> TRandom
upcastTRandom h = let fh = get_fptr h
                      fh2 :: ForeignPtr RawTRandom = castForeignPtr fh
                  in cast_fptr_to_obj fh2

downcastTRandom :: (FPtr a, ITRandom a) => TRandom -> a 
downcastTRandom h = let fh = get_fptr h
                        fh2 = castForeignPtr fh
                    in cast_fptr_to_obj fh2