monads

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How to convert a free monad into a functor?

The Free structure page on the Haskell wiki defines a function to convert a functor instance into a free monad:[详细]

2023-03-09 22:45 分类：问答
Representable Functor isomorphic to (Bool -> a)

I thought I\'d try the intriguing Representable-functors package to define a Monad and Comonad instance for the functor given by data Pair a = Pair a a which is representable by Bool; as mentioned in[详细]

2023-03-09 01:49 分类：问答
Haskell Monads msum in HappStack

From http://happstack.com/docs/crashcourse/HappstackState.html When I run the server, the peek counter increases by[详细]

2023-03-08 11:17 分类：问答
Access the configuration parameters through a monad?

Quote from here: http://www.haskell.org/haskellwiki/Global_variables If you have a global environment,[详细]

2023-03-07 17:05 分类：问答
How to write a haskell function without IO in type sig by hiding 'state' changes

I wrote a function in haskell that takes a few parameters like Word32, String (ignore currying) and outputs IO Word32. Now, this is a function in the true sense: for the same inputs, the output will a[详细]

2023-03-07 13:46 分类：问答
How do I find out whether a monad is commutative?

The documentation for Control.Monad.List.ListT states that it \"does not yield a monad unless the argument monad is commutative.\"[详细]

2023-03-07 10:59 分类：问答
Type problem with CodeGenFunction/CodeGenModule with LLVM/Haskell

I am, for some time, experimenting with LLVM, simply because. It does, however, consume more of my time than I thought.[详细]

2023-03-07 07:13 分类：问答
Reading in arbitrary amount of binary messages

I am parsing binary data out of files using Binary.Get and have something like the following: data FileMessageHeaders = FileMessa开发者_运维问答geHeaders [FileMessageHeader][详细]

2023-03-07 02:32 分类：问答
Can't perform I/O in foldr?

I have a Data.Map structure that maps Strings to Stringss. For whatever reason, I want to print the contents of the map in the format key: value using foldrWithKey, like so:[详细]

2023-03-06 13:39 分类：问答
how do i create a computational expression that takes parameters?

I want to create a couple of computational expressions that would be used to access the database and return a list of items like so (I also have questions in the code comments):[详细]

2023-03-06 00:19 分类：问答