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|
cabal-version: >=1.10
name: random
version: 1.2.1.2
license: BSD3
license-file: LICENSE
maintainer: core-libraries-committee@haskell.org
bug-reports: https://github.com/haskell/random/issues
synopsis: Pseudo-random number generation
description:
This package provides basic pseudo-random number generation, including the
ability to split random number generators.
.
== "System.Random": pure pseudo-random number interface
.
In pure code, use 'System.Random.uniform' and 'System.Random.uniformR' from
"System.Random" to generate pseudo-random numbers with a pure pseudo-random
number generator like 'System.Random.StdGen'.
.
As an example, here is how you can simulate rolls of a six-sided die using
'System.Random.uniformR':
.
>>> let roll = uniformR (1, 6) :: RandomGen g => g -> (Word, g)
>>> let rolls = unfoldr (Just . roll) :: RandomGen g => g -> [Word]
>>> let pureGen = mkStdGen 42
>>> take 10 (rolls pureGen) :: [Word]
[1,1,3,2,4,5,3,4,6,2]
.
See "System.Random" for more details.
.
== "System.Random.Stateful": monadic pseudo-random number interface
.
In monadic code, use 'System.Random.Stateful.uniformM' and
'System.Random.Stateful.uniformRM' from "System.Random.Stateful" to generate
pseudo-random numbers with a monadic pseudo-random number generator, or
using a monadic adapter.
.
As an example, here is how you can simulate rolls of a six-sided die using
'System.Random.Stateful.uniformRM':
.
>>> let rollM = uniformRM (1, 6) :: StatefulGen g m => g -> m Word
>>> let pureGen = mkStdGen 42
>>> runStateGen_ pureGen (replicateM 10 . rollM) :: [Word]
[1,1,3,2,4,5,3,4,6,2]
.
The monadic adapter 'System.Random.Stateful.runStateGen_' is used here to lift
the pure pseudo-random number generator @pureGen@ into the
'System.Random.Stateful.StatefulGen' context.
.
The monadic interface can also be used with existing monadic pseudo-random
number generators. In this example, we use the one provided in the
<https://hackage.haskell.org/package/mwc-random mwc-random> package:
.
>>> import System.Random.MWC as MWC
>>> let rollM = uniformRM (1, 6) :: StatefulGen g m => g -> m Word
>>> monadicGen <- MWC.create
>>> replicateM 10 (rollM monadicGen) :: IO [Word]
[2,3,6,6,4,4,3,1,5,4]
.
See "System.Random.Stateful" for more details.
category: System
build-type: Simple
extra-source-files:
README.md
CHANGELOG.md
tested-with: GHC == 8.0.2
, GHC == 8.2.2
, GHC == 8.4.3
, GHC == 8.4.4
, GHC == 8.6.3
, GHC == 8.6.4
, GHC == 8.6.5
, GHC == 8.8.1
, GHC == 8.8.2
, GHC == 8.10.1
source-repository head
type: git
location: https://github.com/haskell/random.git
library
exposed-modules:
System.Random
System.Random.Internal
System.Random.Stateful
other-modules:
System.Random.GFinite
hs-source-dirs: src
default-language: Haskell2010
ghc-options:
-Wall
if impl(ghc >= 8.0)
ghc-options:
-Wincomplete-record-updates -Wincomplete-uni-patterns
build-depends:
base >=4.8 && <5,
bytestring >=0.10.4 && <0.13,
deepseq >=1.1 && <2,
mtl >=2.2 && <2.4,
splitmix >=0.1 && <0.2
if impl(ghc < 8.0)
build-depends:
transformers
test-suite legacy-test
type: exitcode-stdio-1.0
main-is: Legacy.hs
hs-source-dirs: test-legacy
other-modules:
T7936
TestRandomIOs
TestRandomRs
Random1283
RangeTest
default-language: Haskell2010
ghc-options: -rtsopts -with-rtsopts=-M9M
if impl(ghc >= 8.0)
ghc-options:
-Wno-deprecations
build-depends:
base,
containers >=0.5 && <0.7,
random
test-suite doctests
type: exitcode-stdio-1.0
main-is: doctests.hs
hs-source-dirs: test
default-language: Haskell2010
build-depends:
base,
doctest >=0.15 && <0.23
if impl(ghc >= 8.2) && impl(ghc < 8.10)
build-depends:
mwc-random >=0.13 && <0.16,
primitive >=0.6 && <0.8,
random,
stm,
unliftio >=0.2 && <0.3,
vector >= 0.10 && <0.14
test-suite spec
type: exitcode-stdio-1.0
main-is: Spec.hs
hs-source-dirs: test
other-modules:
Spec.Range
Spec.Run
Spec.Stateful
default-language: Haskell2010
ghc-options: -Wall
build-depends:
base,
bytestring,
random,
smallcheck >=1.2 && <1.3,
stm,
tasty >=1.0 && <1.6,
tasty-smallcheck >=0.8 && <0.9,
tasty-hunit >=0.10 && <0.11,
transformers
-- Note. Fails when compiled with coverage:
-- https://github.com/haskell/random/issues/107
test-suite spec-inspection
type: exitcode-stdio-1.0
main-is: Spec.hs
hs-source-dirs: test-inspection
default-language: Haskell2010
ghc-options: -Wall
build-depends:
base,
random,
tasty >=1.0 && <1.6
if impl(ghc >= 8.0)
build-depends:
tasty-inspection-testing
other-modules:
Spec.Inspection
benchmark legacy-bench
type: exitcode-stdio-1.0
main-is: SimpleRNGBench.hs
hs-source-dirs: bench-legacy
other-modules: BinSearch
default-language: Haskell2010
ghc-options:
-Wall -O2 -threaded -rtsopts -with-rtsopts=-N
if impl(ghc >= 8.0)
ghc-options:
-Wno-deprecations
build-depends:
base,
random,
rdtsc,
split >=0.2 && <0.3,
time >=1.4 && <1.13
benchmark bench
type: exitcode-stdio-1.0
main-is: Main.hs
hs-source-dirs: bench
default-language: Haskell2010
ghc-options: -Wall -O2
build-depends:
base,
mtl,
primitive >= 0.7.1,
random,
splitmix >=0.1 && <0.2,
tasty-bench
|
