I have a set of messages, that all derive from Message, and implement the interface IMessage: class Message : IMessage { public string example1; } class LogOnMessage : Message { public string password; } class LogOffMessage : Message { public string anotherExample; } I have a messaging system, in which a proxy is able to de...
Hi, I have a Class FileDoc Public Class FileDoc Inherits BaseClass Public Sub DeleteDoc() dim catId as integer = Cat_ID End Sub a bunch of properties... End Class And I have another Class... Public Class BaseClass Private _Cat_ID As Integer Public Property Cat_ID() As Integer Get Return _Cat_ID End Get S...
Hello, Suppose we have an abstract class Element from which classes Triangle and Quadrilateral are derived from. Suppose yet that these classes are used in conjunction with interpolation methods that depend on the shape of the element. So, basically we create an abstract class InterpolationElement from which we derive InterpolationTri...
I have a django model like this: class Something(models.Model): title = models.CharField(max_length=200, default=u'') text = models.CharField(max_length=250, default=u'', blank=True) photo = models.ImageField(upload_to=u'something') def photo_thumb(self): if self.photo: return u'<img src="%s" />'...
Hi everyone, I thought I understood the concept of the JavaScript prototype object, as well as [[proto]] until I saw a few posts regarding class inheritance. Firstly, "JavaScript OOP - the smart way" at http://amix.dk/blog/viewEntry/19038 See the implementation section: var parent = new this('no_init'); And also "Simple JavaScript ...
Hi All, As I am working as a C# developer, I know that we can implement multiple inheritance by use of Interface. Can anybody please provide me link OR code for how to achieve multiple inheritance with C#. I want code for how to achieve multiple inheritance in C# with the use of Interface. Thanks in advance. ...
I'm writing Python scripts for Blender for a project, but I'm pretty new to the language. Something I am confused about is the usage of static variables. Here is the piece of code I am currently working on: class panelToggle(bpy.types.Operator): active = False def invoke(self, context, event): self.active = not self.act...
Hi! I've been studying javascript inheritance for a couple days, and although i've made quite a lot of progress there are some things I don't quite understand yet. For example, i find this behaviour quite confusing: var Employee = function Employee() { this.company = 'xyz'; }; var Manager = function Manager() { this.wage = 'high'; }; ...
I have a template class MyTemplate. It works fine. But as soon as I create another class that derives from it, I get errors. //main.cpp template <typename T> class MyTemplate { public: T* test() { return new T(this); //error here. } }; template <typename T> class MyTemplate2 : public MyTemplate<T> { }; ...
public Subclass(String[] parameters) throws IllegalArgumentException { super("Rectangle", Double.parseDouble(parameters[0]), Double.parseDouble(parameters[1]), 90, Double.parseDouble(parameters[2]), Double.parseDouble(parameters[3])); if(parameters.length != ...
Let's assume that we need to define a common class for trees (or some other objects we need to have in order to solve a problem). Since our class structure can be quite complex, I prefer to define class methods after its definition. Our common class BaseTree and one of our specific classes Tree are class BaseTree class BaseNode; end ...
Hi, I want to create a list that can only accept certain types. As such, I'm trying to inherit from a list in Python, and overriding the append() method like so: class TypedList(list): def __init__(self, type): self.type = type def append(item) if not isinstance(item, type): raise TypeError, 'item i...
If we execute run the following code, the output is 10. interface X{ int abc = 0; } interface XX extends X{ int abc = 10; } class XTest implements XX { public static void main(String[] args) { System.out.println("Hello World! --> " +abc); } } But as per Java, interface variables are public static final. but how am I gettin...
Hi, i was wondering if there's a difference between modeling a one-to-one relation and a inheritance relation (Table-Per-Type) In both cases we add a foreing key with a UNIQUE constraint, or somethimes the FK is part of the PK It seems to me that the table structure is the same, but maybe i'm missing something. Thanks in advance. ...
Hello. I have a product class in C# that inherits from another product class using ExternalAssemb.ProductA; public class MyProduct : ProductA { //.... } I'm trying to do an explicit cast from ProductA that is in a DLL I reference but it's telling me it's unable to cast MyProduct myProduct = (MyProduct)productAobject; Result::...
I have some rudimentary question about inheritance in C#. I have two classes. I want the child class to inherit all members of the base class (e.g. x and y), but it seems to use inheritance I should initialize the base constructor. If I define another x and y in child class so that i later initialize the base constructor so what is the ...
I wanted to know how to access to the super class’s variables with a object of child class If it makes any sense I add that some of the variables are defined in this __variable name way. Any time I want to access the variables with a child object. Python says the object with the type CHILE CLASS TYPE here is not defined. I wanted to kn...
I don't understand why my output is not how I think it should be. I think that it should be Dog barks line break Cat meows. But there is nothing there. Code: namespace ConsoleApplication2 { class Program { static void Main(string[] args) { Pets pet1 = new Dog(); Pets pet2 = new Cat(); pet1.Say(); pe...
How can I generate an inheritance chart in C#? I have a lot of classes in this project and it would be useful. Edit: I have VS2008 ...
I've got an Abstract PHP superclass, which contains code that needs to know which subclass its running under. class Foo { static function _get_class_name() { return get_called_class(); //works in PHP 5.3.*, but not in PHP 5.2.* } static function other_code() { //needs to know echo self::_get_...