Is there any way to take \"things\" out of a monad? I am developing a game, and I am now trying to understand about databases. I found happstack really nice, but I can\'t get the thing.
Consider the next example. I have a monad MyM that is just a StateT {-# LANGUAGE TypeFamilies #-} import Control.Monad.State
As far as I know String is a type in Haskell: type String = [Char] Then I don\'t understand why the following code:
I\'ve defined a lot of functions (say, 100+), each of which do a specific work but with the same signature. That is something like:
Imagine an imperative rendering engine that blits sprites to a bitmap that later gets displayed. This heavily relies on the ability to efficiently mutate individual pixels in sai开发者_如何学God bitma
The documentation of Data.Array reads: Haskell provides indexable arrays, which may be thought of as functions whose domains are isomorphic to contiguous subsets of the
I have a type class IntegerAsType a where value :: a -> Integer data T5 instance IntegerAsType T5 where value _ = 5
This goes into an infinite loo开发者_如何学Cp on tryhaskell.org.I am not sure why. last $ filter (<100) $ [2..] >>= (\\a -> if 0 == (length $ filter (== 0) $ map (mod a) $ [2..a-1]) then
In a Haskell program compiled with GHC, is it possible to programmatically guard against excessive memory usage?That is, have it notify the program when memory usage reaches a specified limit, prefera
I have a pretty straightforward function that takes a parameterized data type and returns the same type:
加载中,请稍侯......