typeclass

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Writing A Function Polymorphic In A Type Family

I was experimenting with type families yesterday and ran into an obstacle with the following code: {-# LANGUAGE TypeFamilies #-}[详细]

2023-03-19 10:23 分类：问答
Showing data types in Curry

Does Curry have the ability to show or pretty print data types inside the REPL (using PAKCS or MCC)? In Haskell, this functionality is impemented using the type class Show. Howe开发者_运维知识库ver, n[详细]

2023-03-19 04:55 分类：问答
What is Haskell's Data.Typeable?

I\'ve come acro开发者_StackOverflowss references to Haskell\'s Data.Typeable, but it\'s not clear to me why I would want to use it in my code.[详细]

2023-03-18 21:53 分类：问答
Haskell typeclass hierarchy issue

I have a scenario that involves type classes and I\'开发者_如何学JAVAm not quite sure how to go about solving it.[详细]

2023-03-16 20:13 分类：问答
Can traits in D be used for type classes?

I\'m new to D, and I\'m looking for a good way to program with Haskell-like type classes e.g. Functors, Monoids, etc. in D.[详细]

2023-03-12 05:39 分类：问答
Cleaning up function type signatures with type classes

Given a function s开发者_开发技巧ignature like this (using the riak package): put :: (Storable a, Resolvable a, ToJSON a, FromJSON a) => Connection -> a -> IO ()[详细]

2023-03-12 02:54 分类：问答
haskell state and typeclasses

how can i group getX and putX in a class instance ? the code below is an answer for this post Class set method in Haskell using State-Monad[详细]

2023-03-10 11:07 分类：问答
How to specify a typeclass instance?

I have a (fairly) legitimate case where there are two type instance implementations, and I want to specify a default one. After noting that doing modular arithmetic with Int types resulted in lots of[详细]

2023-03-10 01:14 分类：问答
Why does Haskell appear to default to reading Int when reading Num?

I didn\'t expect the following code to work: foo :: (Num a) => a -> a foo x = x + x main = do print (foo (read \"7\"))[详细]

2023-03-09 04:39 分类：问答
Haskell type class hierarchy in Java

I write a library with Java interfaces resembling Haskell type classes, and abstract classes implementing all \"derivable\" methods (e.g. Monad.join can be written using >>= and return). This 开[详细]

2023-03-08 12:21 分类：问答