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Add StatefulGen instance for Gen #333

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Add StatefulGen instance for Gen #333

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798a8f3
Add StatefulGen instance for Gen
lehins Jul 25, 2021
7911535
Forgot some CPP
lehins Jul 25, 2021
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3 changes: 3 additions & 0 deletions src/Test/QuickCheck.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,9 @@ module Test.QuickCheck

-- * The 'Gen' monad: combinators for building random generators
, Gen
#ifndef OLD_RANDOM
, QC(..)
#endif
-- ** Generator combinators
, choose
, chooseInt
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14 changes: 13 additions & 1 deletion src/Test/QuickCheck/Gen.hs
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@@ -1,4 +1,5 @@
{-# LANGUAGE CPP #-}
{-# LANGUAGE MultiParamTypeClasses #-}
#ifndef NO_ST_MONAD
{-# LANGUAGE Rank2Types #-}
#endif
Expand Down Expand Up @@ -42,7 +43,9 @@ import Data.Word
import Data.Int
import Data.Bits
import Control.Applicative

#ifndef OLD_RANDOM
import System.Random.Stateful
#endif
--------------------------------------------------------------------------
-- ** Generator type

Expand Down Expand Up @@ -92,6 +95,15 @@ instance MonadFix Gen where
let a = unGen (f a) r n
in a

#ifndef OLD_RANDOM
data QC = QC

instance StatefulGen QC Gen where
uniformWord32 QC = MkGen (\r _n -> runStateGen_ r uniformWord32)
uniformWord64 QC = MkGen (\r _n -> runStateGen_ r uniformWord64)
uniformShortByteString k QC =
MkGen (\r _n -> runStateGen_ r (uniformShortByteString k))
#endif
--------------------------------------------------------------------------
-- ** Primitive generator combinators

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