Visual inheritance http://devnet.kentico.com/docs/7_0/devguide/index.html?visual_inheritance.htm The content of sub-pages is displayed using Page placeholder web parts. The result of this approach is that the sub-page content is "nested" inside…

坏味道--平行继承体系(Parallel Inheritance Hierarchies) 平行继承体系(Parallel Inheritance Hierarchies) 其实是 霰弹式修改(Shotgun Surgery) 的特殊情况. 特征 每当你为某个类添加一个子类,必须同时为另一个类相应添加一个子类.这种情况的典型特征是:某个继承体系的类名前缀或类名后缀完全相同. 问题原因 起初的继承体系很小,随着不断添加新类,继承体系越来越大,也越来越难修改. 解决方法 一般策略是:让一个继承体系的…

我们已经在code-first 约定一文中,已经知道了Code-First为每一个具体的类,创建数据表. 但是你可以自己利用继承设计领域类,面向对象的技术包含“has a”和“is a”的关系即,有什么,是什么,的关系,但是基于SQL关系的实体和数据表集合之前,只是有“has a ”的关系.数据库管理系统(SQL database management systems)不支持继承类型,所以,你怎么将面向对象的领域实体和关系型的数据库映射在一起呢??? 下面有三种方式,在Code-First中表现…

type 字段在 Rails 中默认使用来做 STI(single-table inheritance),当 type 作为普通字段来使用时,可以把SIT的列设置成别的列名(比如不存在的某个列). 文档在这里http://api.rubyonrails.org/classes/ActiveRecord/ModelSchema/ClassMethods.html#method-i-inheritance_column, 使用下面的方法就是设置 STI 使用的列名,默认是‘type',既然不想使用…

Link1: Give an example Note: I think the Storable::Write method should also be pure virtual. http://www.cprogramming.com/tutorial/virtual_inheritance.html Link2: explained from the vritual table point of view, Key point: as virual inheritance, compli…

React的组合   composition: props有个特殊属性,children,组件可以通过props.children拿到所有包含在内的子元素, 当组件内有子元素时,组件属性上的children属性不生效,当组件无子元素时,属性中的children生效 function FancyBorder(props) { return ( <div className={'FancyBorder FancyBorder-' + props.color}> {props.children} &…

No classes involved; Objects inherit from other objects. Use an empty temporary constructor function  F().  Set the prototype of  F() to be the parent object. Return a new instance of the temporary constructor. function Object(o) { function F() {} F.…

// the parent constructor function Parent(name) { this.name = name || 'Adam'; } // adding functionality to the prototype Parent.prototype.say = function () { return this.name; }; // empty child constructor function Child(name) {} inherit(Child, Paren…

In Java you could do something like: Person adam = new Person(); In JavaScript you would do: var adam = new Person(); JavaScript’s constructor invocation looks as if Person were a class, but it’s important to keep in mind that Person is still just a…

Template inheritance jade支持通过关键字block和extends来实现模板继承. 比如,在layout.jade写上如下代码 html head title My Site - #{title} block scripts script(src='/jquery.js') body block content p Nothing block foot #footer p some footer content 中间的block content代表块,content表示块…