ghc

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Good introductory text about GHC implementation?

When programming in Haskell (and especially when solving Project Euler problems, where suboptimal solutions tend to stress the CPU or memory needs) I\'m often puzz开发者_运维百科led why the program be[详细]

2023-03-07 05:52 分类：问答
Android application in haskell

Hi i know there are similar questions. But maybe thare are any updates or new libraries in this area.[详细]

2023-03-05 22:50 分类：问答
ghci segfault with simple math

Can anyone explain this to me? I\'m using a recent version of the GHC. Prelude> let f x = 1/((x**2)-36)[详细]

2023-03-05 16:54 分类：问答
ghc compile error but runghc works

UPDATE SOLVED I updated to Haskell Platform 2011.2.0.1and GHC 7.0.3 and now it works!! I have the following haskell file named \"webscrap2.hs\". I can execute \"runghc webscrap2.hs\" and it works f[详细]

2023-03-05 11:27 分类：问答
Why can I not make String an instance of a typeclass?

Given: data Foo = FooString String … class Fooable a where --(is this a good way to name this?) toFoo :: a -> Foo[详细]

2023-03-04 13:40 分类：问答
How to prevent common sub-expression elimination (CSE) with GHC

Given the program: import Debug.Trace main = print $ trace \"hit\" 1 + trace \"hit\" 1 If I compile with ghc -O (7.0.1 or higher) I get the output:[详细]

2023-03-03 19:34 分类：问答
What is a nested pattern in Haskell?

What is a \'nested\' pattern in Haskell. I hear the term everywhere but am not sure what the it actually means. How would you define it? Any examples?[详细]

2023-03-03 13:29 分类：问答
Haskell -- bidirectional class instance type implications OR GADT existential type qualifications?

I have a GADT defined like (abbreviated), {-# LANGUAGE StandaloneDeriving #-} data D t where C :: t -> D t[详细]

2023-03-02 14:07 分类：问答
Emitting warnings from Template Haskell splices

I know that I can cause a compile-time error by calling fail from a splice, but is it possible to only generate a warning? In particular I would like it to be possible to turn this warning into an err[详细]

2023-02-28 17:03 分类：问答
Eq instance has some strange comparisons

I have made an image processing module that defines a Pixel type as a Color and Location. Pixel, Color, and Location derive Eq, as I may want to compare pixels between multiple images.[详细]

2023-02-28 13:11 分类：问答