Endo Monoid newtype Endo a = Endo { appEndo :: a -> a } instance Monoid (Endo a) where mempty = Endo id Endo f `mappend` Endo g = Endo (f . g) Endo 是个 newtype,也就是对现有类型的封装. Endo a 封装的是一个自反射的函数,即 a->a.通过 appEndo 字段可以取出这个函数. Endo a 在结合时结合两个函数,因此它本质上是对函
上一篇文章我们编写了此例的DTO层,本文将数据访问层封装为逻辑层,提供给界面使用. 1.获取TFS Dto实例,并且可以获取项目集合,以及单独获取某个项目实体 public static TFSServerBll Instance = new TFSServerBll(); public TFSServerDto dto; public TFSServerBll() { dto = new TFSServerDto("http://server:8080/tfs/Project/");
Delphi中编写的Dll: library TestDLL; { Important note about DLL memory management: ShareMem must be the first unit in your library's USES clause AND your project's (select Project-View Source) USES clause if your DLL exports any procedures or functions th
上节我们讨论了Zipper-串形不可变集合(immutable sequential collection)游标,在串形集合中左右游走及元素维护操作.这篇我们谈谈Tree.在电子商务应用中对于xml,json等格式文件的处理要求非常之普遍,scalaz提供了Tree数据类型及相关的游览及操作函数能更方便高效的处理xml,json文件及系统目录这些树形结构数据的相关编程.scalaz Tree的定义非常简单:scalaz/Tree.scala * A multi-way tree, also kn
//MyInt.pas unit MyInt; interface {$IFNDEF MYLIB} function MyAdd(a,b:integer):integer ;stdcall; {$ENDIF} implementation {$IFNDEF MYLIB} function MyAdd; external 'MyLib.dll' name 'MyAdd'; {$ENDIF} end. //MyLib.dpr library MyLib; { Important note about
通过记录键盘和鼠标位置和输入信息,然后模拟发送,就能够创建一个按键精灵! 主要代码如下: library KeyBoardHook; { Important note about DLL memory management: ShareMem must be the first unit in your library's USES clause AND your project's (select Project-View Source) USES clause if your DLL exp