inheritance

Javascript class defenition

When the myClass function returns a single string "hii", testClass.getDetails() works fine: function myClass(name, age) { this.name = name; this.age = age; return "hii"; } myClass.prototype.getDetails = function() { return "mydetails"; } var testClass = new myClass('aneesh', 27); alert(testClass.getDetails()); But wh...

when do we need virtual function since we can get the same feel using simple single level inheritance?

Though we can get the feel of virtual function by inheriting a class and enhancing the functionality of the function in the base class, when should we go for virtual function? ...

Inheritance in hibernate

I would like to implement inheritance in Hibernate. I created ObjectClass object: @Entity @Table(name = "object") @Inheritance(strategy = InheritanceType.JOINED) public class ObjectClass { private id; } and CodeTable object that inhertance Object class: @Entity @ForeignKey(name = "id") @Table(name = "code_table") public class ...

AS3 Inheritance : load or init event ?

Let's assume we have the following class : public class ImageButton extends MovieClip { private var bmpNormal:BitmapData; // ------- Properties ------- public function get BmpNormal():BitmapData { return bmpNormal; } public function set BmpNormal(value:BitmapData):void { bmpNormal = value; } public function I...

Global instance in prototypal javascript

I am exploring a pattern where you can save a global reference to the current instance for simple use in anonymous functions where the this keyword is out of context. Consider this: var instance; var a = function(id) { instance = this; this.id = id; }; a.prototype.get = function() { return (function() { return instance.id; ...

MOQ - how to mock an interface that needs to be cast to another interface?

what I want to do is construct a moq for I1 - which is fine ... however in the course of the method that I am testing that uses this mock I need to cast it to I2 in order to access some properties that are not on I1 Interface I1 { int AProperty{get;set;}} Interface I2 {int AnotherProperty{get;set;}} I then have some objects Class O...

Hibernate annotations for inheritance

I would like to implement inheritance in Hibernate. in the database: object table is: CREATE TABLE `object` ( `id` bigint(11) NOT NULL auto_increment, PRIMARY KEY (`id`), ) code_table table is: - CREATE TABLE `code_table` ( `id` bigint(11) NOT NULL auto_increment, `description` varchar(45) character set latin1 default ...

django login authentication

I'm relatively new to django.. In the app that I'm building, there are multiple types of users (ie User1, User2, User3) that are all inheriting from django.contrib.auth.models.User and upon login, each user should be redirected to a success page depending on what type of user they are. In views.py: def login_attempt(request): user = ...

Java inheritance

Why does is print last "I'm a Child Class." ? public class Parent { String parentString; public Parent() { System.out.println("Parent Constructor."); } public Parent(String myString) { parentString = myString; System.out.println(parentString); } public void print() { S...

java inheritance problem - have to create empty constructor in father class

Hi, I program on netbeans ubuntu java standart project (test preparation). when I create AccountStudent.java I get error. Account.java public abstract class Account { protected double _sum; protected String _owner; protected static int accountCounter=0; public Account(String owner){ this._sum=0; this._owner=owner; a...

When I derive a class in C++, does it create an object of base class and store it as my member variable in derived class?

Say i create a derived class as below, class CHIProjectData : public QObject { CHIProjectData(QMap<QString,QString> aProjectData, CHIMetaData* apMetaData = 0, QObject* parent = 0); private: QMap<QString,QString> m_strProjectData; CHIAkmMetaData* m_p...

'QObject::QObject' cannot access private member declared in class 'QObject'

class CHIProjectData : public QObject { public: CHIProjectData(); CHIProjectData(QMap<QString,QString> aProjectData, CHIAkmMetaData* apAkmMetaData = 0, QObject* parent = 0); private: QMap <QString,QString> m_strProjectData; CHIAkmMetaData* m_pAkmMetaData; }; CHIProjectData::CHIProjec...

Java:: How Can be child class constructor class neutralize parent constructor?

Hi, Java:: How Can be child class constructor class neutralize parent constructor? I mean in Child constructor we have to use super()- does exist way not to create parent object ? Example with super: class abstract Parent{ protected String name; public Parent(String name){ this.name=name; } } class Child extends Parent{ public Ch...

casting an object to base interface

Hello, I have got a problem on casting an object to one of it's base interfaces living in another library. Here is the code for it: BaseSDK.dll public interface IPlugin { void Run(); } CustomPlugin.Definition.dll: public interface ICustomPlugin { void DoCustomStuff(); } CustomPlugin.dll (has reference to BaseSDK.dll and Cu...

imports and extends

can any one explain " While we are importing a package we can use its all public functions, Then what is the use of extending a class ?" " I m studying OOP Langusges for 3 years and i didnt get ans to this question " ...

Why YUI.lang.extend implements Inheritance this way?

I'm reading YUI2.8.1 source code yahoo/yahoo.js. The YAHOO.lang.extend method is implemented this way http://github.com/yui/yui2/blob/master/build/yahoo/yahoo.js I don't understand why it creates another F function. IMHO, below code should also work(ignoring overrides part) function extend (subc, superc ) { if (!superc||!subc) { ...

Java abstract class inheritance question

I have an abstract class with a single concrete method. In this method I want to use a static class variable from the classes that derive from the one the method is declared in. To do so, I of course have to declare this static variable in the abstract class as well. When the method is called, the variable is resolved to the one in my...

C++: overriding pure virtual member variable?

This question is best described in code. I have a class called Vertex that contains an instance of a class called Params: class Params { virtual Params operator + (Params const& p) = 0; }; class Vertex { public: Params operator + (Params const& ap) const { return p + ap }; virtual float eva...

Issue with NHibernate auditing and inherited classes

I have an Animal class that implements IDomainObject. There is another class, Cat, that inherits from Animal. I'm using a Table Per Subclass inheritance strategy for my NHibernate mappings and map the CreatedDate and LastModified properties to columns in the Animal table and to columns in the Cat table. I also use a PreUpdate event hand...

Interface inheritance: is extending properties possible?

I want to do this: interface IBase { string Property1 { get; } } interface IInherited : IBase { string Property1 { get; set; } } So that IInherited would have the inherited property Property1 with added functionality to allow set. Is that possible? What's the syntax? EDIT: please notice I put the word "inherited" in bold fa...