hyone
/ IndexedMatrixAndIFunctor.hs
Last active
October 12, 2015 07:18
Length Indexed Matrix and Indexed Functor
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| -- Run on GHC 7.6.1 | |
| {-# LANGUAGE DataKinds #-} | |
| {-# LANGUAGE PolyKinds #-} | |
| {-# LANGUAGE TypeFamilies #-} | |
| {-# LANGUAGE TypeOperators #-} | |
| {-# LANGUAGE GADTs #-} | |
| {-# LANGUAGE RankNTypes #-} | |
| {-# LANGUAGE FlexibleContexts #-} |
hyone
/ gist:3973701
Created
October 29, 2012 13:56
Don't match type level arithmetic result with same literal value on GHC 7.6.1
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| -- $ ghci | |
| -- GHCi, version 7.6.1: http://www.haskell.org/ghc/ :? for help | |
| ghci> import GHC.TypeLits | |
| ghci> :set -XDataKinds | |
| ghci> :set -XPolyKinds | |
| ghci> :set -XGADTs | |
| ghci> data EqRefl a b where { Refl :: EqRefl a a } | |
| ghci> :t Refl :: EqRefl 1 1 | |
| Refl :: EqRefl 1 1 :: EqRefl Nat 1 1 |
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| {-# LANGUAGE FlexibleContexts #-} | |
| import Data.Conduit | |
| import qualified Data.Conduit.List as CL | |
| import Network.HTTP.Conduit | |
| import Control.Concurrent.Async (mapConcurrently) | |
| import Control.Concurrent.MVar | |
| import Control.Monad.IO.Class (liftIO) | |
| import Control.Monad.Trans.Control (MonadBaseControl) |
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| -- Run on GHC 7.4.2 | |
| {-# LANGUAGE FlexibleInstances #-} | |
| {-# LANGUAGE OverlappingInstances #-} | |
| {-# LANGUAGE UndecidableInstances #-} | |
| {-# LANGUAGE DataKinds #-} | |
| {-# LANGUAGE PolyKinds #-} | |
| {-# LANGUAGE TypeFamilies #-} | |
| {-# LANGUAGE TypeOperators #-} | |
| {-# LANGUAGE ScopedTypeVariables #-} |
hyone
/ gist:3629254
Created
September 5, 2012 02:16
Define function that accepts only a specific data constructor on a type
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| {-# LANGUAGE GADTs #-} | |
| data Nil | |
| data Cons | |
| data StrongList x tag where | |
| Nil :: StrongList a Nil | |
| Cons :: a -> StrongList a b -> StrongList a Cons | |
| safeHead :: StrongList x Cons -> x |
hyone
/ gist:3615967
Created
September 4, 2012 02:44
Define function that accepts only specific multi data constructors on a type
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| {-# LANGUAGE GADTs #-} | |
| data MyString | |
| data MyInt | |
| data MyNil | |
| data MyData tag where | |
| MyString :: String -> MyData MyString | |
| MyInt :: Int -> MyData MyInt | |
| MyNil :: MyData MyNil |
hyone
/ gist:3246709
Created
August 3, 2012 11:11
Number of binary trees have N leaves with logging by Writer Monad
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| import Control.Arrow (first) | |
| import Control.Monad.List | |
| import Control.Monad.Writer | |
| liftList :: (Monad m) => [a] -> ListT m a | |
| liftList = ListT . return | |
| splites :: Int -> [(Int, Int)] | |
| splites n = [ (x, n - x) | x <- [1..n-1] ] |
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| splites :: Int -> [(Int, Int)] | |
| splites n = [ (x, n - x) | x <- [1..n-1] ] | |
| count :: Int -> Int | |
| count 1 = 1 | |
| count n = sum $ do | |
| (i, j) <- splites n | |
| return $ count i * count j |
hyone
/ gist:3238199
Created
August 2, 2012 16:05
Multiple async HTTP requests by using http.async.client callback API
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| ;; (defproject async-test2 "0.1.0-SNAPSHOT" | |
| ;; :description "FIXME: write description" | |
| ;; :url "http://example.com/FIXME" | |
| ;; :license {:name "Eclipse Public License" | |
| ;; :url "http://www.eclipse.org/legal/epl-v10.html"} | |
| ;; :dependencies [[org.clojure/clojure "1.4.0"] | |
| ;; [http.async.client "0.4.5"]]) | |
| (ns async-test2.core |
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| import Control.Monad.State | |
| splitEvery :: Int -> [a] -> [[a]] | |
| splitEvery n = takeWhile (not . null) . evalState (sequence $ repeat (state (splitAt n))) | |
| {- | |
| ghci> splitEvery 5 [1..27] | |
| [[1,2,3,4,5],[6,7,8,9,10],[11,12,13,14,15],[16,17,18,19,20],[21,22,23,24,25],[26,27]] | |
| ghci> splitEvery 5 [] | |
| [] |