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C + + template metaprogramming-2 mimics the list of Haskell and related actions

{158Std::cout ' ';159Printlist (list()); the }161 162Template163 voidPrintlist (List)164 {165Std::cout V;166}(Sure enough, only the statically highlighted C + + code looks the same as Xiang)That's how it's used.1 listfoldleft0;, Add, Decltype (list) >:: Result xxx; 2 listscanleft3;, Add, Decltype (list) >:: Result yyy; 3 printlist (yyy); 4 printlist (XXX);FOLDL1,FOLDR,FOLDR1 and the corresponding SCANR ... Ah ah ah ah ah oh ah1 int Main () 2 {3 cout the whole person is feeling full of powe

Functor Anatomy of Haskell abstract concept

Before understanding functor, it is necessary to understand the category theory of abstract algebra, the knowledge of category theory as the foreshadowing, the feeling functor is not so difficult to understand.A category C includes: an object-composed class Ob (C) objects. Each State shot F has a "source object" A and "target object" B, and both A and B are within OB (C). It is therefore written as f:a B, and the F is a state shot from a to B. A "state shot" of all A-t

Trizip Haskell implementation

Tags: blog HTTP for Io Div re 1 trizip: [a]-> [B]-> [c]-> [(a, B, c)] 2 trizip a B c 3 | null A = [] 4 | null B = [] 5 | null c = [] 6 trizip (X: XS) (Y: ys) (Z: ZS) = (++) [(x, y, z)] (trizip Xs ys ZS) [Email protected] ~ /Haskell $ ghcighci, version 7.6.3: http://www.haskell.org/ghc :? For helploading package ghc-prim... linking... done. loading package integer-GMP... linking... done. loading Package base... linking... done. prelude>: l trizip. H

Haskell Language Learning Note (semigroup)

Semigroupclass Semigroup a where (A semigroup (semigroup) is a type class, which is the base class of the unitary semigroups (monoid).Haskell Language Learning Note (semigroup)

Haskell Language Learning Note (52) Regular expressions

Text.Regex.PCRE.HeavyPrelude Text.Regex.PCRE.Heavy> :set -XQuasiQuotesPrelude Text.Regex.PCRE.Heavy> :set -XFlexibleContextsPrelude Text.Regex.PCRE.Heavy> "123-4567-89" =~ [re|\d{3}-(\d{4})-\d{2}|]TruePrelude Text.Regex.PCRE.Heavy> scan [re|\d{3}-(\d{4})-\d{2}|] "123-4567-89"[("123-4567-89",["4567"])]Prelude Text.Regex.PCRE.Heavy> :set -XScopedTypeVariablesPrelude Text.Regex.PCRE.Heavy> gsub [re|\d+|] (\(s::String) -> reverse s) "123-4567-89""321-7654-98"Has

Haskell's Yesod Technology Daquan

Don't say much nonsense, just open up.Please refer to other articles for environment construction. Here is an empty framework to illustrate how to render simple data on a page A: After defaultlayout , you can simply use where to bring the data structure you need, which can be used in the [| |] Use functions and data to render the values you need.[whamlet| |] Can be stacked arbitrarily, but only with one where. This conforms to Haskell's standard syntax.Because do is the standard syntax for

Emacs Novice Note (iii)--a little simple customization for Emacs

Ilocker: Focus on Android Security (new entry, 0 Basics) qq:2597294287在 emacs 启动时,会加载 ~/.emacs 文件。在该文件中编辑一些 lisp 代码,是一种最为简单的定制 emacs 的方式。下面的 lisp 代码主要实现几个按键绑定和窗口最大化等简单的配置:1 ;; window maximization2(Defun my-maximized ()3 (Interactive)4(x-send-client-message5Nil 0 Nil "_net_wm_state" 326' (2 "_net_wm_state_maximized_horz" 0))7(x-send-client-message8Nil 0 Nil "_net_

[Haskell] monods

function becomes GRANDFATHER: sheep-> maybe sheepgrandfather M = (just m) 'comb' father If you require a grandfather, add a mother function similar to father. If you do this, you can skip the exception because the comb function has already been used for consideration. To write this step, we have introduced monad without knowing it. The comb function is actually a> = function, plus the return function and> function, and it is officially promoted to monad. The so-called monad is similar to

Operating the linear algebra library in Haskell and using the matrix and gnuplot Plot Method

Haskell's native data structure is not efficient for large-scale mathematical operations. Using list to store vectors or matrices is inefficient. Fortunately, Haskell has a wealth of third-party libraries that can be used to complete this operation with a powerful professional mathematical library. We will introduce the hmatrix library today. 1. Installation Development Environment: MacOSX 10.5 1. Install the dependent Library GSL (GNU Scientific L

List,list comprehension,tuple in Python, zip, etc. are you learning from Haskell?

Reply content:No! First of all, Python's list and Haskell list are two different things. The latter is a linked list, the former is a dynamic array. Then the implementation of Haskell's list comprehension relies on turning into map/filter (regardless of fusion optimization), and finally through recursion; the Python list comprehension implementation relies on __iter__ Method (that is, the meaning of the iterator), which is finally implemented by l

The Mozart OZ computer programming language has almost all the features you want. It has the shadows of haskell, lisp, prolog, c, perl, java and other languages. (This post will be serialized later)

Mozart-oz The mozart-oz language is a new generation of Computer languages jointly developed by Universit ät des Saarlandes, Swedish Institute of Computer Science, and Universit é catholique de Louvain.The language itself has the shadows of haskell, lisp, prolog, c, perl, java, and so on. It has almost all the features you want, such:Constrained programming features:In processing complex constraints, Languages provide search engines., We only need to

Haskell implements multi-threaded server instance code

This article mainly introduces the multi-threaded server implemented by haskell. for details, refer to the following code: Module Main where Import Network. SocketImport Control. Concurrent Main: IO ()Main = doSock BindSocket sock (SockAddrInet 4242 iNADDR_ANY)Listen sock 10240.MainLoop sock MainLoop: Socket-> IO ()MainLoop sock = doConn ForkIO $ runConn connMainLoop sock RunConn: (Socket, SockAddr)-> IO ()RunConn (sock, tcp) = doSms lt;-recv

Haskell Language Learning Note (ByteString Text)

Data.bytestringString is a synonym for [Char], and there is a performance problem with the inertia of list on use.When working with large binary files, you can use ByteString instead of String.The ByteString contains the Lazy module Data.ByteString.Lazy and the Strict module data.bytestring.Where the Lazy module uses chunks (64K data blocks) internally.Prelude> import qualified Data.ByteString.Lazy as BPrelude B> import qualified Data.ByteString as SPrelude B S> B.pack [99,97,110]"can"Prelude B

Haskell Language Learning Note (bitraversable)

Bitraversableclass (Bifunctor t, Bifoldable t) => Bitraversable t where bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> t a b -> f (t c d) bitraverse f g = bisequenceA . bimap f gbisequenceA :: (Bitraversable t, Applicative f) => t (f a) (f b) -> f (t a b)bisequenceA = bitraverse id idBitraversable is a type class. Used primarily to traverse two-tuple data structures.Either is a bitraversable.instance Bitraversable Either where bitraverse f _ (Left a) = Left (,) It's a bitraversabl

Haskell Language Learning Note (parsec) (4)

Parser typedata ParsecT s u m atype Parsec s u = ParsecT s u Identitytype Parser = Parsec String () Data parsect s U m AParsect with four types of parameters: Data flow type S, User state type U, underlying monad type M, return type A.Parsect is a monad converter. Type parsec s u = parsect s U IdentityThe parsec type is the Parsect type, and the underlying monad type is specific to Identity. Type Parser = Parsec String ()The Parser type is a special type of parsec, the data flow

Maximum sub-array by Haskell

Find-maximum-subarray Introduction to Algorithm Chinese third edition P42 page exercise 4.1-5Maximal sub-array algorithm for non-recursive linear time。。。 But Haskell didn't loop. , my writing is also described in the book .... However, this problem has a very good function of the advantages of writing this problem is too cool, elegant! completely into the pit The most gas is the problem on the Codewars, test all over but because a tab does not allo

Emacs with golang with flymake with goscript. emacs settings

It's kinda late. So I make it quick: How to setup an Emacs with syntax check when you write golang script. In Linux of course. (Require 'go-mode-load)

Emacs Plugins that create the most efficient research environment

0 ElephantAs a beginner, the immediate need is to get started with Emacs and create a research environment that includes automatic completion commands.I think it's easier to find an Emacs configuration environment that matches your needs, compared to the many plug-in installation tutorials on the web.In this example, after the installation of the two Auctex and Cdlatex plug-ins has been tested, the existing

A year to become a master of Emacs (like God using the editor)

Author: chenbin (Redguardtoo)Version number: 20150424Update time: Original time: Copyright: This article is licensed under the following agreement, free reprint-non-commercial-non-derivative-retain attribution | Creative Commons by-nc-nd 3.0, reproduced please specify the author and source.Brief introductionIt's easy to be a master. At the beginning I in the vi camp, occasionally with Emacs also forgot "exit" shortcut key, a year later I entered the

Emacs Configuration (Test room prerequisites) (emacs)

Tags: selected round post back SEL bracket Code Auto MarkdownSeveral times recently left the seat that I had been sitting in, went to another computer room examination.Then suddenly remembered to remember the simple configuration of Emacs.The Noip of the remnants of the memory to pick up a little more ...Attach some explanations(global-set-key [f9] ‘compile-file);;一键编译(弄Devcpp留下来的习惯)(global-set-key (kbd "C-z") ‘undo);;一键撤销(Like Windows)(global-set-key (kbd "C-q") ‘kill-this-buffer);;一键关闭;;(蒟蒻总是搞

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