0.5.1.2 (18 Jan 2020)
- Better error message when total probability sum is negative in
fromListMay, weightedMay, weighted
0.5.1.1 (21 May 2018)
- Only depend on
fail
package when GHC < 8.0.
0.5.1 (9 February 2017)
Re-export System.Random
from Control.Monad.Random.{Lazy,Strict}
and hence also from Control.Monad.Random
.
- Hackage r1: allow
transformers-compat-0.6.x
.
0.5 (3 January 2017)
This release has quite a few small additions as well as a big module
reorganization. However, thanks to module re-exports, most existing
code using the library should continue to work with no changes; the
major version bump reflects the large reorganization and my
inability to 100% guarantee that existing user code will not break.
The biggest changes that may be of interest to users of the library
include new lazy vs strict variants of the Rand
monad; a new
MonadInterleave
class which is a big improvement over
MonadSplit
; new PrimMonad
instances; and new random selection
functions like weighted
, weightedMay
, uniformMay
, etc.. See
the list below for full details.
Although there was some discussion of generalizing MonadRandom
to
work for a wider range of underlying generators
(see
#26,
#31, and
comments on this blog post),
I decided to punt on that for now. It seems rather complicated and
there
are
already good alternatives so
I decided to keep things simple for this release. I’m still open to
proposals for generalizing future releases.
Changes in 0.5 include:
- Refactor to reflect structure of
mtl
and transformers
libraries.
- Add lazy and strict variants of
RandT
.
- Add
MonadRandom
and MonadSplit
instances for ListT
.
- Add (but do not export)
unRandT
field to RandT
.
- Add
MonadCont
, MonadError
, MonadRWS
, PrimMonad
, and MonadFail
instances for RandT
.
- Add
evalRandTIO
operation.
- Move
fromList
and uniform
operations to
Control.Monad.Random.Class
.
fromList
now raises an error when the total weight of elements
is zero.
- Generalize the type of
uniform
to work over any Foldable
.
- Add new operations
weighted
, weightedMay
, fromListMay
, and
uniformMay
. weighted
is like fromList
but generalized to
work over any Foldable
. The May
variants return a Maybe
result instead of raising an error.
- New
MonadInterleave
class for random monads which can interleave
random generation using split
. In some ways this is similar to
MonadSplit
but much more useful.
- Improved documentation.
0.4.2.3 (21 April 2016)
- Mark
Control.Monad.Random
as Trustworthy
.
0.4.2.2 (18 January 2016)
0.4.2.1 (16 January 2016)
- Allow
transformers-compat-0.5
.
0.4.2 (16 January 2016)
- Add
MonadPlus
and Alternative
instances for RandT
.
0.4.1 (20 November 2015)
- Remove unnecessary
Monad m
constraint from liftRandT
and
runRandT
.
This should again technically require a major version bump, but I’m
not doing it this time in the interest of not being super annoying.
If this breaks something for you, just yell, and I will
deprecate this version and do a proper 0.5 release.
0.4 (12 May 2015)
- Remove unnecessary
RandomGen g
constraints from liftRandT
,
liftRand
, evalRandT
, evalRand
, runRandT
, runRand
.
A major version bump is required by the PVP since the types of all
the above methods have changed, but this release is again very
unlikely to break any client code.
0.3.0.2 (30 March 2015)
- Add
transformers-compat
to allow building with newer mtl
0.3.0.1 (24 November 2014)
- Improve documentation: ranges are exclusive at the upper bound
0.3 (4 September 2014)
- Eta-reduce definition of
Rand
- Remove unnecessary
Random a
constraint from types of liftRand
and liftRandT
.
Note that a major version bump is required by the PVP since the
types of liftRand
and liftRandT
have changed, but this release
is highly unlikely to break any client code.
0.2.0.1 (24 August 2014)
- Allow building with both
transformers-0.3
and 0.4
.
0.2 (20 August 2014)
- change
Rand
from a newtype
to a type synonym
MonadRandom
and MonadSplit
instances for
ExceptT
- strict variants of
StateT
and WriterT
- both lazy and strict variants of
RWST
- remove unneeded
RandomGen
constraint from MonadState RandT
instance
0.1.13 (9 February 2014)
- add simple
uniform
function for creating a uniform distribution
over a list of values
0.1.12 (30 September 2013)
- add
liftRandT
and liftRand
functions, for lifting explicit
generator-passing functions into RandT
and Rand
, respectively.
0.1.11 (1 August 2013)
- add
MonadRandom
and MonadSplit
instances for IdentityT
- derive
MonadReader
and MonadWriter
instances instead of declaring
them explicitly (thanks again to James Koppel)
0.1.10 (16 July 2013)
- add
MonadRandom
and MonadSplit
instances for ContT
(thanks to James Koppel for the patch)
0.1.9 (26 April 2013)
- add
MonadRandom
and MonadSplit
instances for MaybeT