# Questions for typeclass

5197

### How should types be used in Haskell type classes?

I'm new to Haskell, and a little confused about how type classes work. Here's a simplified example of something I'm trying to do:9240

### Exporting a polymorphic MonadState function for a particular state data type

What I'm trying to do is (in a module I'm writing) export a function that works on a particular type in a state monad (in the example below, that type would be Foo). However I would like the user t...7305

### Haskell Typeclass shorthand

So, I have a pair of typeclasses that I'll be using a lot together, and I want to avoid specifying both each time. Basically, instead of putting2561

### How to make a type an instance of Eq

I have a data type called Praat. I want Praat to be an instance of Eq so that two Praats are equal if and only if mx are equal. How does one do this?1641

### multiple type parameters in haskell type classes

I'm trying to do some abstraction in Haskell98 but doen't know how to do it.2877

### Choose a typeclass based on return type

I want to be able to have a function, which implementation will choose a typeclass based on the manual type specification of it's return type.437

### How do I create a ListIsomorphic instance for generic vectors?

Given the following class:4208

### How do I create a ListIsomorphic instance for Vector.Unboxed?

Since it seems that writing a ListIsomorphic instance for generic vectors is impossible (or not a good idea), I'm trying to write one for Vector.Unboxed directly.8796

### Provide type-class when implementing/override method

I would prefer to work more with type-classes but having some issues:679

### Multi-parameter type synonym instances

I'm trying to figure out if it's possible (and how) to define class instances for multi-parameter type synonyms.3874

### Haskell ghci read behaviour with * and max

So I've just encountered the following in ghci:3081

### How to create ListIsomorphic instances for tuples and packed types?

Sorry, this is yet another topic in the same serie. I have a typeclass for things that are isomorphic to lists:1103

### Expand type class operations on elements using macros

Assuming the following setup:7628

### Haskell ad hoc polymorphism

I'm trying to get my head around ad-hoc polymorphism in haskell, that is having the same function provide different behaviour for different argument types.5131

### Haskell: Why is there no type mismatch (and why does this compile)?

I was so sleepy that I wrote the following code (modified to just show the confusion):2570

### Facilities for generating Haskell types in Haskell (“second order Haskell”)?

Apologies in advance if this question is a bit vague. It's the result of some weekend daydreaming.3805