StdGen package:MonadRandom

data () => StdGen
MonadRandom Control.Monad.Random.Lazy Control.Monad.Random.Strict
The standard pseudo-random number generator.
getStdGen :: MonadIO m => m StdGen
MonadRandom Control.Monad.Random.Lazy Control.Monad.Random.Strict
Gets the global pseudo-random number generator. Extracts the contents of globalStdGen
initStdGen :: MonadIO m => m StdGen
MonadRandom Control.Monad.Random.Lazy Control.Monad.Random.Strict
Initialize StdGen using system entropy (i.e. /dev/urandom) when it is available, while falling back on using system time as the seed.
mkStdGen :: Int -> StdGen
MonadRandom Control.Monad.Random.Lazy Control.Monad.Random.Strict
Constructs a StdGen deterministically from an Int seed. See mkStdGen64 for a Word64 variant that is architecture agnostic.
mkStdGen64 :: Word64 -> StdGen
MonadRandom Control.Monad.Random.Lazy Control.Monad.Random.Strict
Constructs a StdGen deterministically from a Word64 seed. The difference between mkStdGen is that mkStdGen64 will work the same on 64-bit and 32-bit architectures, while the former can only use 32-bit of information for initializing the psuedo-random number generator on 32-bit operating systems
newStdGen :: MonadIO m => m StdGen
MonadRandom Control.Monad.Random.Lazy Control.Monad.Random.Strict
Applies split to the current global pseudo-random generator globalStdGen, updates it with one of the results, and returns the other.
setStdGen :: MonadIO m => StdGen -> m ()
MonadRandom Control.Monad.Random.Lazy Control.Monad.Random.Strict
Sets the global pseudo-random number generator. Overwrites the contents of globalStdGen