Difference between revisions of "New monads"
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A simple monad transformer to allow computations in the transformed monad to generate random values. |
A simple monad transformer to allow computations in the transformed monad to generate random values. |
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View [[NewMonads/MonadRandom]]. |
View [[NewMonads/MonadRandom]]. |
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+ | == MonadSupply == |
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+ | Here is a simple monad/monad transformer for computations which consume values from a (finite or infinite) supply. Note that due to pattern matching, running out of supply in a non-MonadZero monad will cause an error. |
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+ | View [[NewMonads/MonadSupply]]. |
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+ | == MonadUndo == |
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+ | Here is a modified state monad transformer for keeping track of undo/redo states automatically. |
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+ | View [[NewMonads/MonadUndo]]. |
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+ | == MonadUnique == |
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+ | This is a simple (trivial) monad transformer for supplying unique integer values to an algorithm. |
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+ | View [[NewMonads/MonadUnique]]. |
Revision as of 17:28, 24 August 2006
MonadBase
It seems that the liftIO function from MonadIO can be generalized to access whatever the base of a transformer stack happens to be. So there is no need for a liftSTM, liftST, etc.
View NewMonads/MonadBase.
MonadLib
This is by Iavor S. Diatchki and can be found at http://www.cse.ogi.edu/~diatchki/monadLib/
It is a new version of the mtl package with transformers: ReaderT WriterT StateT ExceptT SearchT ContT
It also defines BaseM which is like MonadBase above.
MonadRandom
A simple monad transformer to allow computations in the transformed monad to generate random values.
View NewMonads/MonadRandom.
MonadSupply
Here is a simple monad/monad transformer for computations which consume values from a (finite or infinite) supply. Note that due to pattern matching, running out of supply in a non-MonadZero monad will cause an error.
View NewMonads/MonadSupply.
MonadUndo
Here is a modified state monad transformer for keeping track of undo/redo states automatically.
View NewMonads/MonadUndo.
MonadUnique
This is a simple (trivial) monad transformer for supplying unique integer values to an algorithm.
View NewMonads/MonadUnique.