Free monad transformers
I'm spinning off the Control.Monad.Trans.Free module from pipes into its own package: transformers-free. Some people requested this because they wanted to experiment with the FreeT type in their own code without making pipes a full-blown dependency. Recently I've evangelized the use of free monads for building abstract syntax trees that let you abstract away the interpreter. This lets you seamless
Operationalモナドをゲームã«å¿œç”¨ã—ãŸè©± - モナドã¨ã‚ãŸã—ã¨ã‚³ãƒ¢ãƒŠãƒ‰
データを処ç†ã™ã‚‹ã“ã¨ã¯ã€ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®ã‚‚ã£ã¨ã‚‚本質的ãªéƒ¨åˆ†ã§ã‚る。数値ã€æ–‡å—列ã€ã‚ã‚‹ã„ã¯ãƒ‡ãƒ¼ã‚¿ã®é›†ã¾ã‚Šãªã©ã‚’扱ã†ãŸã‚ã«ã€æ•°ã€…ã®æ§‹é€ ãŒè€ƒãˆã‚‰ã‚Œã¦ããŸã€‚Haskellã«ãŠã„ã¦ã¯ã€ã€Œæ‰‹é †ã€ã‚‚データã¨ã—ã¦æ‰±ã†ã“ã¨ãŒã§ãる。ã“ã‚Œã¯ã€DSLを作るã†ãˆã§éžå¸¸ã«æœ‰ç”¨ã§ã‚ã‚Šã€ã‚²ãƒ¼ãƒ 開発やデータベースæ“作……手続ããŒã‹ã‹ã‚ã‚‹ã‚らゆるもã®ã«å¿œç”¨ã§ãã‚‹ã ã‚ã†ã€‚ æ‰‹é †ã‚’ãƒ‡ãƒ¼ã‚¿ã¨ã—ã¦æ‰±ã†æ–¹æ³•ã¨ã—ã¦ã€Freeモナドã¨OperationalモナドãŒã‚る。ã“ã“ã§ã¯ã€Operationalモナドをゲームã®ã‚ャラクターã®åˆ¶å¾¡ã«ç”¨ã„ãŸä¾‹ã‚’紹介ã™ã‚‹ã€‚Freeモナドã®å°Žå…¥ã«ã¤ã„ã¦ã¯ã€Andres Löhæ°ã®Haskell eXchange 2013ã®è¬›æ¼”ãŒã‚ã‹ã‚Šã‚„ã™ãã€ãŠã™ã™ã‚ã§ã‚る。 データを作る アクションゲームã®æ•µã®å‹•ãã¨ã—ã¦ã€ã“ã®äºŒã¤ã‚’考ãˆã‚ˆã†: å¾…æ©Ÿ 接近(攻撃) 索敵(プレイヤーã®ä½ç½®ã‚’調ã¹ã‚‹) EnemyMã¨ã„ã†ãƒ¢ãƒŠ
Freeモナドを超ãˆãŸï¼ï¼Ÿoperationalモナドを使ã£ã¦ã¿ã‚ˆã† - モナドã¨ã‚ãŸã—ã¨ã‚³ãƒ¢ãƒŠãƒ‰
é™å®šç‰ˆIOã¿ãŸã„ãªãƒ¢ãƒŠãƒ‰ã‚’ç°¡å˜ã«ä½œã‚ŒãŸã‚‰ã€ã‚³ãƒ¼ãƒ‰ãŒåˆ†é›¢ã§ãã‚‹ã—テストもã—ã‚„ã™ããªã‚‹ã®ã«ãªã‚… æ•°ã‹æœˆå‰ãªã‚‰ã€ ãã‚Œã€Freeモナド*1ã§ã§ãã‚‹ã‚ˆï¼ ã¨è¿”ã•ã‚Œã‚‹ã ã‚ã†ã€‚ã ãŒä»Šã¯é•ã†ã€‚Freeモナドよりも簡å˜ã«ãƒ¢ãƒŠãƒ‰ã‚’作れるモナドã€OperationalモナドãŒã‚ã‚‹ã®ã 。 Freeモナドã«ã¤ã„ã¦å¾©ç¿’ã—よã†ã€‚Freeモナドã¯Functorを基ã«Monadã‚’ä½œã‚Œã‚‹æ§‹é€ ã§ã‚ã‚Šã€Functorã§è‡ªåˆ†è‡ªèº«ã‚’包むã“ã¨ã«ã‚ˆã£ã¦ãƒ¢ãƒŠãƒ‰ã®åŠ›ã‚’å¾—ã¦ã„ã‚‹*2。Functorãã®ã‚‚ã®ã¯DeriveFunctor拡張を使ã£ã¦ç°¡å˜ã«ä½œã‚Œã‚‹ã€‚ {-# LANGUAGE DeriveFunctor #-} import Control.Monad.Free data CharIO a = PutCh Char a | GetCh (Char -> a) | LiftIO (IO a) deriving Functor put
Free モナドã¯æœ‰åŠ¹ï¼Ÿ - Mizon Dev Diary | 2013-04-20
Free モナドã¯æœ‰åŠ¹ï¼Ÿã“ã“æ•°æ—¥ Free モナドã«ã¤ã„ã¦èª¿ã¹ã¦ã„ã¦æ°—ã«ãªã£ãŸã“ã¨ãŒã‚ã‚‹ã®ã§æ›¸ã。Free モナド。興味深ã„åå‰ã®ã“ã®ãƒ¢ãƒŠãƒ‰ã¯ã„ãã¤ã‹ã®èˆˆå‘³æ·±ã„特徴をæŒã¤ã€‚ç¾æ™‚点ã§è‡ªåˆ†ãŒçŸ¥ã£ã¦ã„ã‚‹ã®ã¯æ¬¡ã®3点。データ型 f ã‚’ Functor ã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«ã™ã‚‹ã¨ Free f ㌠Monad ã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«ãªã‚‹Free f 㯠mtl ã®åž‹ã‚¯ãƒ©ã‚¹ã‚’ã¯ã˜ã‚ã¨ã™ã‚‹å¤šæ•°ã®åž‹ã‚¯ãƒ©ã‚¹ã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«ãªã‚‹ (地é“ã«ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã‚’定義ã™ã‚‹ã®ã¯ã‚ã‚“ã©ã„)Free モナドã®ã‚¢ã‚¯ã‚·ãƒ§ãƒ³ Free f a ã¯ä»»æ„ã®ãƒ¢ãƒŠãƒ‰ m ã®ã‚¢ã‚¯ã‚·ãƒ§ãƒ³ m a ã«å¤‰æ›ã§ãã‚‹Free モナドを実用ã™ã‚‹è¦³ç‚¹ã§ã“れらã®ç‰¹å¾´ã‚’見るã¨ã€3点目㮠Free モナドを任æ„ã®ãƒ¢ãƒŠãƒ‰ã«å¤‰æ›ã§ãる特徴ã«æ³¨ç›®ã—ãŸã„。ã“ã‚Œã¯ã€Free モナドã®å„アクションをインターフェースã¨è¦‹ç«‹ã¦ã¦ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚’ã™ã‚‹ã¨ã€ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã®å®Ÿè£…コードをãã®ãƒ—
The Comonad.Reader » Free Monads for Less (Part 1 of 3): Codensity
A couple of years back Janis Voigtländer wrote a nice paper on how one can use the codensity monad to improve the asymptotic complexity of algorithms using the free monads. He didn't use the name Codensity in the paper, but this is essentially the meaning of his type C. I just returned from running a workshop on domain-specific languages at McMaster University with the more than able assistance of
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Logo Design NZ blogã®ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã‹ã‚‰ã€ä½¿ã„å‹æ‰‹ã®ã‚ˆã•ãã†ãªã€ãƒšãƒ¼ã‚¸ã®ã‚¢ã‚¯ã‚»ãƒ³ãƒˆã«ã‚‚最é©ãªãƒ•ãƒªãƒ¼ã®ãƒ‡ã‚¶ã‚¤ãƒ³ãƒ•ã‚©ãƒ³ãƒˆã‚’紹介ã—ã¾ã™ã€‚ Download Top 20 Designing Fonts
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Monads for free! | SkillsCast
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