emacs haskell

Has been plagued by the "attempt to read or write protected memory" issue when C # was called Haskell (see the C # call Haskell encounter attempted to read or write protected memory,c# when invoking Haskell). Attempt to read or write protected memory "problem", and trapped in it, the more deep, unable to extricate themselves, almost abandoned with C # to solve th

Due to the recent in-depth Android ndk development, I had to deal with the command line GDB-Eclipse is too slow to connect to GDB!I think it is always inappropriate to use Gud to manipulate ndk-GDB in Emacs. Therefore, the command line method is used instead. The call stack created by the Bt (backtrace) command is always copied from terminal to Emacs again.I spent more time thinking this day and wanted to

Content Summary:Algebraic data type-algebraic data Types;Custom data type--data keyword; value builder; type variable and type constructor;Record syntax-a syntactic sugar that simplifies custom data types;A complete example-purchaseorder definition and simple calculation, unit test;Algebraic datatype (algebraic data Types)Why does the data type of Haskell have the name algebraic data type? Thinking back to our junior high school, the first time to lea

Use Evernote in Emacs If you are not particularly out, you must have tried Evernote. Maybe you are still using the Evernote browser plug-in to collect this article (pai_^ ). Evernote is a set of software and services used to take notes and query notes. evernote can be a text, a webpage or webpage clip, an image, sound, or hand-painted ink, and the notes can contain attachments such as PDF. the following search methods are supported for existi

To learn Lisp, you can see SICP, I spent a summer time to chew SICP, chew to chew not move, but found that really learned a lot of interesting things, and then go to play Haskell, probably learn Haskell intermittent also have half a year of time, But I feel that what I learned in Haskell is much more than what I've learnt in SICP, probably because I'm not strong

1. In Haskell, the string is indeed the syntactic sugar of the character array. 2. merge list In Haskell, the combined list is implemented using the ++ OPERATOR: Here, we can also see the relationship between strings and character arrays. However, the ++ operator traverses the list on the left. The longer the list, the slower the access. In this case, it is better to use: However, the: operator c

Source Address: Haskell Learning-functorWhat is functor functor is an object that can perform map operations, and functor is like an expression with a semantic appended to it, which can be likened to a box. The definition of functor can be interpreted like this: given a mapping of A to B function and a box, the result will return to the box loaded with B. Fmap can be thought of as a function that accepts functions and a functor , which apply function

;;; Emacs Configuration File;; Set row height(Setq-default line-spacing 5)(Custom-set-variables;; Custom-set-variables was added by Custom.;; If you edit it by hand, you could mess it up and so is careful.;; Your init file should contain only one such instance.;; If there is more than one, the they won ' t work right.' (package-selected-packages (quote (Php-mode)))' (Truncate-partial-width-windows t))(custom-set-faces;; Custom-set-faces was added by C

(Tool-bar-mode 0)(Menu-bar-mode 0)(Blink-cursor-mode 0);;( Set-scroll-bar-mode Nil);;( Global-linum-mode 0)(Set-default-font "16");;( Fringe-mode 1);; -----Color Setting---------;; (Set-background-color "#000");; (set-foreground-color "White");; (Set-face-foreground ' highlight "green");; (Set-face-background ' Highlight "blue");; (Set-face-background ' Region "Red");; (set-face-foreground ' Region "yellow");; (setq Global-font-lock-mode T)(setq frame-title-format "@%b");; Displays the name of b

the data type that can be changed during the program's operation. In other words, it is around the "meta-programming" characteristics. Meta-programming refers to changing the definition of "class" at run time, such as access, additions, or modifications, and so on. Word, is "program to write programs." Groovy is the closest dynamic language to Java. At the end of 07, a period of contact with groovy program, but also mixed with the groovy Chinese community of the owner, but I am so fond of think

Installation Under centos/Fedora # Yum install ghc Version [[Email protected] Haskell] # ghc-V Glasgow Haskell compiler, version 7.0.4, for Haskell 98, Stage 2 booted by ghc version 7.0.4 Change Prompt Echo: set prompt "ghci>"> ~ /. Ghci Command # Boolean Ghci> true false False # Call function, get successor of 8 Ghci> succ 8 9 # Load scripts # Echo doublem

In Google group, we can see someone talking about the new usage of Haskell, that is, using Haskell to write the web. I checked it. It turns out that snap, A Haskell Web framework, looking at some of the benchmark results published by snap, it feels pretty good, both in the common Pong test and in the file test are relatively leading. It seems that you need to und

types (type) Haskell type system static type system, at compile time know the data type, so different types of value operations at compile time will be error, such as with Boolean and integer operation, in C language this operation will not error. Haskell supports type derivation using the: T command followed by any available expression, you can get the type of the expression, such as: T ' a ' will output

GNU Emacs 23.1.1 Copyright (c) 2009 Free Software Foundation, Inc. GNU Emacs comes with absolutely no warranty. You may redistribute copies of Emacs Under the terms of the GNU General Public License. For more information about these matters, see the file named copying. ;;;; -----------. Emacs ----------------------

Like Linux, in the heart there is a desire to delve into the impulse of Linux. The idea is to be proficient with Emacs, and then use Emacs to work efficiently, read code, write programs, send and receive emails, and so on, but Emacs is not something that is as easy to use as Windows Word or VC. I have learned before, but it was always intermittent, and did not

Manual calculation of Set mapped 5 [[+]set l b = runIdentity . l (\_ -> Identity b)mapped = sets fmapsets f g = taintedDot (f (untaintedDot g))instance Settable Identity where untainted = runIdentity untaintedDot = (runIdentity #.) taintedDot = (Identity #.)set mapped 5 [1,2,3]= runIdentity . (sets fmap) (\_ -> Identity 5) $ [1,2,3]= runIdentity $ sets fmap (\_ -> Identity 5) $ [1,2,3]= runIdentity $ taintedDot (fmap (untaintedDot (\_ -> Identity 5))) $ [1,2,3]= runIdentity $ (Identity .) (fm

Preview, reviewPrelude Control.Lens> view _Left (Left "abc")"abc"Prelude Control.Lens> view _Right (Right "abc")"abc"Prelude Control.Lens> view _Just (Just "abc")"abc"Prelude Control.Lens> preview _Left (Left "abc")Just "abc"Prelude Control.Lens> review _Left "abc"Left "abc" The preview and review functions handle either such and typesThe preview function walks up a branch.The review function goes down one branch. Preview, review version of the operatorPrelude Control.Lens> Left "a

Distributiveclass Functor g => Distributive g where distribute :: Functor f => f (g a) -> g (f a) distribute = collect id collect :: Functor f => (a -> g b) -> f a -> g (f b) collect f = distribute . fmap f distributeM :: Monad m => m (g a) -> g (m a) distributeM = fmap unwrapMonad . distribute . WrapMonad collectM :: Monad m => (a -> g b) -> m a -> g (m b) collectM f = distributeM . liftM fcotraverse :: (Distributive g, Functor f) => (f a -> b) -> f (g a) -> g bcotraverse f

Say less nonsense. BusinessWhat is a functional language, my initial understanding is: function-oriented, function-forming functions.Now the compiler, with the suffix. HSSkip the download Installation section.I am under Windows systemI found myself another editor with a graphical interface: WINGHCIHttp://www.softpedia.com/get/System/Launchers-Shutdown-Tools/WinGhci.shtmlVery concise.A bit like the one that Python comes with.The Haskell function is the

11.3.1.2 Haskell's latency calculation policy, 11.3.1.2haskell 11.3.1.2 Haskell latency calculation Policy In lazy evaluation strategy, the parameter value of the function is not calculated during function calling until it is used later. Let's go back to the previous example: TestAndCalculate (Calculate (10 )); Haskell jumps directly to the subject of the TestAndCalculate function.