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在 Haskell 中使用 Continuation 实现单线程并发控制 - Tech Notes
http://veryr.com/posts/continuation-based-thread-in-haskell
在 Haskell 中使用 Continuation 实现单线程并发控制. 之前在 Section 3.3. Continuations. 看到 Scheme 实现的一个用 call/cc 模拟的多任务程序, 还挺好玩的:. 我估摸着吧, Haskell 里的 callCC 也可以这么玩，不过 Haskell 里面没有副作用，也就没有赋值，这个. 就需要绕个弯子, 借助 IORef 来实现了。 稍微解释一下 这个程序会不断地打印 print once . 程序的执行过程是这样的，callCC 把 callCC 之后的三行代码绑定到 k 上了， 然后把 k 保存到 ref 里面。 这后三行代码呢，打印一个行 print once , 然后把保存在 ref 里的 k 拿出来，继续执行, 跳转到 callCC 那去了。 接下来就简单了，依葫芦画瓢抡一个 Haskell 版本的 light weight process 了 :. 这个程序呢，不断打印 Hello World , 几乎就是原来 Scheme 版本的一一对应， 没啥好解释的了。 The Scheme Programming Language.
Monad 的意义 - Tech Notes
http://veryr.com/posts/monad-purpose
学习 haskell, 基本上大家的第一个反应是学这东西有什么用? 也是, 学习一个东西之前知道这玩意有啥用, 才有动力去学. 想当年, 刚开始学线性代数的时侯, 矩阵变换来变换去, 我就一直耿耿于怀: 变来变去搞什么名堂, 有啥子用? 因此, 线性代数就没学好. 考试考完就全忘了. 后来才发现这玩意用处还不小: 可以解多元方程, 可意做图形学上的空间变换, 重新捡起书本, 我才对线性代数有了点印象. 学习 Haskell 有甚么用处呢. 现在想来, 用处也不大, 主要还是兴趣. Haskell 是一门很优美的语言, 虽然也有一些来源于兼容性的妥协, 但是大体上而言, Haskell 简单, 一致, 正交, 静态类型, 高性能, 基本符合个人对一门完美编程语言的要求. Monad 的意义. 任何学习 Haskell 的一大成就或者说一大障碍就是 Monad. 好多人学 Haskell 学到 Monad 这一章不禁疑窦丛生: 这劳什子做什么的, 未啥别的语言里面都没遇到过? CPU 是电路的的抽象, 汇编是 CPU (硬件) 抽象, 操作系统(系统调用)是汇编的抽象. C 语言是操作系统的抽象.
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8 皇后的 Haskell 解法 - Tech Notes
http://veryr.com/posts/queens
8 皇后的 Haskell 解法. 八皇后谜题问的是怎样将八个皇后摆在国际象棋棋盘上. 使得任意一个皇后都不能攻击另一个皇后(也就是说, 任意两个皇后都不在同一行、同一列或者同一对角线上). 运行的还是挺慢的. 不过代码应该很好懂, 我再解释一下:. Map (zip ([1.n]) $ permutations [1.n]. August 7, 2012.
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veryquirkygirl
Saturday, January 22, 2011. Spent the evening at the Detriot Temple. With the Benner's, Jastal's, and Van Duren's. If you have questions about our Temples after perusing this link please let me know. I highly recommend the use of Sea-Bands. If you get motion sick. For the first time I arrived at the temple with no nausea! No nausea make for a much more uplifting evening. The trip was as always entertaining. An evening of laughter and prayer.an evening well spent. Scriptures from my adventure. Karen Benne...
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Fundraising page for the British Red Cross. Meanwhile, back in the city.". Continuing Friday before the show. James signing that same Macbeth dvd on Friday ;-p. 02 July 2009 @ 11:37 pm. Going to New York for the weekend. I promise I will put the video up when I come back. 21 June 2009 @ 06:08 pm. I'll post the video in the. For now here are 3 screencaps of James saying hello to Korea. :-). Hello to Korea. How are you doing, all of you? He is freaking adorable! 10 June 2009 @ 07:59 am. Actually, he was cr...
veryqyp | A fine WordPress.com site
A fine WordPress.com site. Skip to primary content. Skip to secondary content. Проститутки на кубе цены. March 19, 2015. Проститутки на кубе цены. Если она ниже тебя, ставишь раком на ступеньку выше. Дешёвые проститутки на бабушкинской. Но совсем не так. Он все равно овладеет ею. А сейчас боятся да и на Родину насрать. Секс знакомства в кирово чепецке. Если думать так, вы действительно не. Проститутку снять в питере. Кто до конца верен себе. Найти проститутку в серпухове. Утки по пояс переходили. Интим у...
Tech Notes
Warp : Haskell 的高性能 Web 服务器(译文). 纯洁的 IO 与 自由的 Monad. 在 Haskell 中使用 Continuation 实现单线程并发控制. 8 皇后的 Haskell 解法.
Very Rach
You Don’t Know What You’ve Got ‘Till It’s Gone. So, for the past few years I’ve practiced keeping these flowers alive. I’ve watered them on the front porch all summer long, and planted a few here and there in hopes they would pop back up in the years to come. Here’s where the story starts to unravel. My current home is a nice small house. It has 2 bedrooms, a basement, and a nice yard. It’s rented. Here’s what the house looks like:. So, what did I do? They would have nice flowers to look at too. The ...
VeryRach
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