diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright (c) 2017, M Farkas-Dyck
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of M Farkas-Dyck nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Random.hs b/Random.hs
new file mode 100644
--- /dev/null
+++ b/Random.hs
@@ -0,0 +1,43 @@
+{-# LANGUAGE DefaultSignatures #-}
+
+module Random where
+
+import Control.Monad.Primitive
+import Control.Monad.Trans.Reader
+import qualified Control.Monad.Trans.State as M
+import Data.Primitive.MutVar
+import Data.Tuple (swap)
+import Data.Void
+
+import Util
+
+class Gen g where
+    type Mut s g = m | m -> s g
+    type instance Mut s g = MutVar s g
+    type Native g
+    uniformNative :: M.State g (Native g)
+    uniformNativeM :: PrimMonad m => ReaderT (Mut (PrimState m) g) m (Native g)
+    default uniformNativeM :: (Mut (PrimState m) g ~ MutVar (PrimState m) g,
+                               PrimMonad m) => ReaderT (Mut (PrimState m) g) m (Native g)
+    uniformNativeM = ReaderT $ flip atomicModifyMutVar $ swap . M.runState uniformNative
+
+class Split g where
+    split :: g -> (g, g)
+
+class Uniform b a where
+    liftUniform :: Monad m => m b -> m a
+
+instance Uniform a a where liftUniform = id
+
+uniform :: (Gen g, Uniform (Native g) a) => M.State g a
+uniform = liftUniform uniformNative
+
+uniformM :: (Gen g, Uniform (Native g) a, PrimMonad m) => ReaderT (Mut (PrimState m) g) m a
+uniformM = liftUniform uniformNativeM
+
+instance {-# OVERLAPPABLE #-} (Bounded a, Enum a, Bounded b, Enum b) => Uniform b a where
+    liftUniform = fmap (toEnum' . foldr (\ m n -> card @b * n + fromEnum' m) 0)
+                . replicateA ((card @a + card @b - 1) `div` card @b)
+
+instance Uniform Void a where
+    liftUniform = fmap $ \ case
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/Util.hs b/Util.hs
new file mode 100644
--- /dev/null
+++ b/Util.hs
@@ -0,0 +1,18 @@
+{-# LANGUAGE AllowAmbiguousTypes #-}
+
+module Util where
+
+import qualified Data.List as L
+import Numeric.Natural
+
+replicateA :: Applicative p => Natural -> p a -> p [a]
+replicateA n = sequenceA . L.genericReplicate n
+
+card :: ∀ a . (Bounded a, Enum a) => Natural
+card = L.genericLength [minBound @a..]
+            
+fromEnum' :: (Bounded a, Enum a) => a -> Natural
+fromEnum' a = L.genericLength [minBound..a] - 1
+
+toEnum' :: (Bounded a, Enum a) => Natural -> a
+toEnum' = L.genericIndex [minBound..]
diff --git a/random-class.cabal b/random-class.cabal
new file mode 100644
--- /dev/null
+++ b/random-class.cabal
@@ -0,0 +1,34 @@
+name:                random-class
+version:             0.1.0.0
+synopsis:            Class of random value generation
+-- description:         
+license:             BSD3
+license-file:        LICENSE
+author:              M Farkas-Dyck
+maintainer:          strake888@gmail.com
+-- copyright:           
+category:            Random
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     Random
+  other-modules:       Util
+  -- other-extensions:    
+  build-depends:       base >=4.9 && <5
+                     , primitive
+                     , transformers
+  -- hs-source-dirs:      
+  default-language:    Haskell2010
+  default-extensions:  UnicodeSyntax
+                     , LambdaCase
+                     , EmptyCase
+                     , TypeApplications
+                     , ScopedTypeVariables
+                     , PolyKinds
+                     , TypeFamilies
+                     , TypeFamilyDependencies
+                     , MultiParamTypeClasses
+                     , FlexibleContexts
+                     , FlexibleInstances
+  ghc-options:         -Wall -Wno-name-shadowing