Experimenting with existential types. Seems to be a great way to get some type flexibility. I\'m hitting a problem with unboxing an existential type after I\'ve wrapped it up. My code as follows:
Is there some Haskell extension that enables the creation of more complex data constructors then GADT?
Is there some way (any way) to implement constraints in type classes? As an example of what I\'m talking about, suppose I want to implement a Group as a type class. So a type would be a group if ther
I\'m Having problems understanding functors, specifically what a concrete type is in LYAH. I believe this is because I don\'t understand what [] really is.
I want to convert a Haskell Float to a String that contains the 32-bit hexadecimal representation of the float in standard IEEE format.开发者_JAVA百科 I can\'t seem to find a package that will do this
I am attempting to fix the size of a widget in GTK+, specifically using Gtk2hs with Haskell. I have drawn an image in a DrawingArea and I would like to specify the exact size of this drawi开发者_如何
I\'ve been exploring the Stack Overflow data dumps and thus far taking advantage of the friendly XML and “parsing” with regular expressions. My attempts with various Haskell XML libraries to find th
I\'m currently making a scanner for a basic compiler I\'m writing in Haskell. One of the requirements is that any character enclosed in single quotes (\') is translated into a character literal token
I\'m writing an audio program in Haskell using Portaudio. I have a function that generates a list of samples I\'d like to play, and I\'m trying to play them using the following snippet inside main:
This works: data Wrapped a = Wrapped a alpha :: IO s -> IO () alpha x = do rv <- wrapit x return () where
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