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The significant changes to the various parts of the compiler are listed in the following sections. There have also been numerous bug fixes and performance improvements over the 7.4 branch. Polymorphic kinds and data promotion are now fully implemented and supported features: Section 7.8, “Kind polymorphism”. Windows 64bit is now a supported platform. It is now possible to defer type errors until r
This article is a stub. You can help by expanding it. The cabal-install package provides the cabal command-line tool which simplifies the process of managing Haskell software by automating the fetching, configuration, compilation and installation of Haskell libraries and programs. Those packages must be prepared using Cabal and should be present at Hackage. See https://cabal.readthedocs.io/ for mo
Immutable arrays (module Data.Array.IArray) The first interface provided by the new array library, is defined by the typeclass IArray (which stands for "immutable array" and defined in the module Data.Array.IArray) and defines the same operations that were defined for Array in Haskell'98. The big difference is that it is now a typeclass and there are 4 array type constructors, each of which implem
All About Monads is a tutorial on monads and monad transformers and a walk-through of common monad instances. You can download a PDF version here. And here is a version of the article which includes source code. Understanding Monads Introduction What is a monad? If you're approaching Haskell monads a little nervously, that's understandable. You've probably heard that monads are a very powerful cod
Stack trace General usage Recent versions of GHC allow a dump of a stack trace (of all cost centres) when an exception is raised. In order to enable this, compile with -prof, and run with +RTS -xc. (Since only the cost centre stack will be printed, you may want to add -fprof-auto -fprof-cafs[1] to the compilation step to include all definitions in the trace.) Since GHC version 7.8, the function er
ThreadScope is a tool for performance profiling of parallel Haskell programs. The ThreadScope program allows us to debug the parallel performance of Haskell programs. Using ThreadScope we can check to see that work is well balanced across the available processors and spot performance issues relating to garbage collection or poor load balancing. Getting Started Have gtk on your machine? (Note that
This page contains notes and information about how to get the various GUI packages available for GHC up and running on different platforms, and some basic usage information to get you going. Please feel free to add stuff here. Starting points wxHaskell is a GHC binding to the wxWidgets cross-platform GUI library. One of the key benefits of wxWidgets is that it provides code portability with a 'nat
There has been confusion about the distinction between errors and exceptions for a long time, repeated threads in Haskell-Cafe and more and more packages that handle errors and exceptions or something between. Although both terms are related and sometimes hard to distinguish, it is important to do it carefully. This is like the confusion between parallelism and concurrency. The first problem is th
The problem The JavaScript problem is two-fold and can be described thus: JavaScript, the language. JavaScript, the language, has some issues that make working with it inconvenient and make developing software harder : lack of module system (only pre-ES6), weak-typing, verbose function syntax1 (pre-ES6), late binding2, which has led to the creation of various static analysis tools to alleviate thi
Reactive-banana is a library for Functional Reactive Programming (FRP). FRP offers an elegant and concise way to express interactive programs such as graphical user interfaces, animations, computer music or robot controllers. In particular, it promises to avoid the spaghetti code that is all too common in traditional approaches to GUI programming. The goal of the library is to provide a solid foun
It is not uncommon to want to call a Haskell function from C code. Here's how to do that. We define the fibonacci function in Haskell: {-# LANGUAGE ForeignFunctionInterface #-} module Safe where import Foreign.C.Types fibonacci :: Int -> Int fibonacci n = fibs !! n where fibs = 0 : 1 : zipWith (+) fibs (tail fibs) fibonacci_hs :: CInt -> CInt fibonacci_hs = fromIntegral . fibonacci . fromIntegral
[Haskell-iPhone] First patches for iPhone cross compiler against GHC head Stephen Blackheath [to GHC-iPhone] likeliest.complexions.stephen at blacksapphire.com Mon Mar 19 10:50:55 CET 2012 Previous message: [Haskell-iPhone] GHC 7.4.1 support? Next message: [Haskell-iPhone] iPhone demo Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] All, Here are some rough patches that create a GHC-
(このページはHaskellではIOがどのように扱われているかを手っ取り早く紹介することを目的としています。学ぶべきことすべてはお伝えできませんが、どのように動作しているかを感覚はつかめると思います。) Haskellでは、副作用は特定の型の値としてエンコードすることで考慮されなければならない、とすることで副作用がある処理と純粋な関数を切り離してきました。(IO a)型の値はアクションです。これは実行されたらaという型の値を生成しますよ、ということを表しています。 いくつか例を見てみましょう: getLine :: IO String putStrLn :: String -> IO () -- note that the result value is an empty tuple. randomRIO :: (Random a) => (a,a) -> IO a -- in pract
Welcome to the Cabal User Guide Edit on GitHub Welcome to the Cabal User Guide 1. Getting Started with Haskell and Cabal 1.1. Installing the Haskell toolchain 1.2. Creating a new application 1.3. Run a single-file Haskell script 1.4. What Next? 2. Introduction 2.1. A tool for working with packages 2.2. What’s in a package 2.3. Cabal featureset 2.4. Similar systems 3. Package Concepts and Developm
This index includes documentation for many Haskell modules. For documentation on the GHC API, see ghc-7.0.4/index.html. Modules Arrayhaskell98-1.1.0.1Bitshaskell98-1.1.0.1CErrorhaskell98-1.1.0.1CForeignhaskell98-1.1.0.1CPUTimehaskell98-1.1.0.1CStringhaskell98-1.1.0.1CTypeshaskell98-1.1.0.1Charhaskell98-1.1.0.1Complexhaskell98-1.1.0.1ControlControl.ApplicativebaseControl.ArrowbaseControl.Categoryba
The significant changes to the various parts of the compiler are listed in the following sections. There have also been numerous bug fixes and performance improvements over the 7.2 branch. The Num class no longer has Eq or Show superclasses. A number of other classes and functions have therefore gained explicit Eq or Show constraints, rather than relying on a Num constraint to provide them. You ca
There are two main styles of writing functional programs, which are both supported by Haskell mainly because several language designers preferred these different styles. In the declaration style you formulate an algorithm in terms of several equations that shall be satisfied. In the expression style you compose big expressions from small expressions.
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Arrows are a new abstract view of computation, defined by John Hughes [Hug00]. They serve much the same purpose as monads -- providing a common structure for libraries -- but are more general. In particular they allow notions of computation that may be partially static (independent of the input) or may take multiple inputs. If your application works fine with monads, you might as well stick with t
Literate programming was invented / coined / started by Dr. Donald Knuth. In fact, if you asked Dr. Knuth what his favourite programming language was, (5th question of http://www-cs-faculty.stanford.edu/~knuth/faq.html) you would be told CWEB - which is a literate programming tool combining C and tex. What is literate programming? To quote Dr. Knuth: "The main idea is to regard a program as a comm
is also a Rank-1 type because it is equivalent to the previous signature. However, a forall appearing within the left-hand side of (->) cannot be moved up, and therefore forms another level or rank. The type is labeled "Rank-N" where N is the number of foralls which are nested and cannot be merged with a previous one. For example: (forall a. a -> a) -> (forall b. b -> b) is a Rank-2 type because t
Daniel Waterworth da.waterworth at gmail.com Sun Dec 25 10:30:49 CET 2011 Previous message: [Haskell-cafe] book.realworldhaskell.org is down Next message: [Haskell-cafe] parListChunk problem Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Hi all, This is what I've been working on recently in my spare time, https://github.com/DanielWaterworth/siege . It's a DBMS written in Haskell, i
Welcome to Haddock’s documentation!¶ This is Haddock, a tool for automatically generating documentation from annotated Haskell source code. Contents:
Repa is a Haskell library for high performance, regular, multi-dimensional parallel arrays. All numeric data is stored unboxed and functions written with the Repa combinators are automatically parallel (provided you supply "+RTS -N" on the command line when running the program). This document provides a tutorial on array programming in Haskell using the Repa package and was based on version 3.2 of
This page is for keeping a record of significant changes in darcs xmonad and xmonad-contrib since the 0.9 releases. See darcs changes in the source repositories for the patches and more details covering documentation and bug fixes not noted here. Xmonad 0.9 was released on 26 October 2009, and Xmonad 0.10 on 18 November 2011. (0.9.1 was a maintenance release, with no changes to user functionality.
Below you will find a list of all Haskell implementations. The recommended way to install Haskell on your computer is through GHCup and/or The Haskell Tool Stack. Haskell 2010 Glasgow Haskell Compiler (GHC) GHC is an optimising compiler for Haskell, providing many language extensions. GHC is the de facto standard compiler if you want fast code. GHC is written in Haskell (plus extensions), and its
The declarations in the syntactic category topdecls are only allowed at the top level of a Haskell module (see Chapter 5), whereas decls may be used either at the top level or in nested scopes (i.e. those within a let or where construct). For exposition, we divide the declarations into three groups: user-defined datatypes, consisting of type, newtype, and data declarations (Section 4.2); type clas
How would one go about modeling units (seconds, meters, meters per second, etc) in Haskell? I'm particularly interested in getting the typechecker to verify proper usage, and do not want to restrict it to any particular numeric representation (i.e. both integral seconds and fractional seconds). If this can in fact be done, it could also be used to model coordinate system axes in, say, Geometric Al
Yampa is a domain-specific embedded language for the programming of hybrid (discrete and continuous time) systems using the concepts of Functional Reactive Programming (FRP). Yampa is structured using Arrows, which greatly reduce the chance of introducing space- and time-leaks into reactive, time-varying systems. Yampa was originally developed by the Yale Haskell Group based on the original idea o
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