Tagged Questions

A feature of some object-oriented computer programming languages in which a class can inherit behaviors and features from more than one superclass or base class.

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Is there any way to do multiple inheritance in Ext js v3.4

In my application there is a single select dropdown (ComboBox) Now I want to add check box to every text in that dropdown ( to make it multi-select) Im aware that there is a plugin to get this done ...
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1answer
19 views

Groovy way to selectively mixin methods from mutliple classes

I'm writing a Groovy script based on commons-io that monitors some source directory and synchronizes its files with some destination directory. @Grab(group='commons-io', module='commons-io', ...
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0answers
36 views

how could I gain a class address from it's base in multiple-inheritance?

I used a third-part library in my company. In it, Some classes I need is defined like this: class A {}; class B : public A {}; class C : public A {}; class Foo : public B , public C , public A ...
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1answer
40 views

virtual method behaves differently with multiple inheritance

why this works struct Base { virtual void visit(const A &) { }; virtual void visit(const B &) { }; } and this complains about ambiguity when calling visit method template< ...
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1answer
39 views

Is it safe to use *virtual* multiple inheritance if QObject is being derived from DIRECTLY?

I understand that in general, multiple inheritance from QObject-derived classes (even virtual multiple inheritance) is not supported in Qt. I understand the reason to be (I think) that even in the ...
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2answers
86 views

Some basic Inheritance problems in C++

I am learning OO in C++ programming these days in VS2010. I meet with some basic Inheritance problems in C++. Here is my code: Question 1: class bs { public: int a; virtual void name(){}; }; ...
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3answers
31 views

Accessing static members from 2 inherited class

I have a base class with a static queue: class A : public otherClass{ protected: static Queue queue[SIZE]; static int front, rear; public: void funcA(); void funcB(); }; Now 2 ...
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2answers
26 views

Am I correct to think of inheritance as a combination of these 3 things?

A inherits B means A owns B. A shares all B interface. A shares implementation of B interface. Abstract classes are similar (@protocol in objective-c, for example. A implements B means 2. A ...
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2answers
29 views

Python: check the order of classes in multiple inheritance

In my framework I must assure that when a class inherits from ClassA, it must inherit also from ClassB, with ClassB following ClassA (in order to make overridden methods work [in Django forms]). E.g. ...
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1answer
65 views

Multiple Inheritance/Polymorphism Homework

I have a homework assignment coming up that I am a bit confused on. The assignment basically states that we are to use Multiple Inheritance/Polymorphism to make 21 classes in a hierarchical manner. I ...
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2answers
29 views

erasing from a vector with a base class ptr

I have a class called Circle used in a physics simulation. A circle is declared as follows: class Circle : public IPhysics, public IRenderable { ... } The circles are created, then ...
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1answer
47 views

Inheritance of list and its first component

I would like to have a class (this is C++) that inherits from a list of weighted components, and inherits from the type of the list's components, such that I can directly access the first member. I am ...
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22 views

Cooperative multiple inheritance issue

This is an extension to this question and raises a problem, which you, my fellow StackOverflowers, will hopefully be able to help me with. From the referenced question, consider the final code sample: ...
2
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1answer
62 views

Is it possible to write an exception type that “catches” multiple different exceptions?

I was wondering whether it would be possible (through clever conversion rules) to write an "exception" class that would help with the following: Instead of writing: try { ... } catch ...
0
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1answer
30 views

Jade: How to extend base-templates based on value of a variable

I have two "master-templates" called ios.jade and android.jade plus multiple "child-templates" that should extend either ios.jade or android.jade based on the value of a variable. Unfortunately I ...
0
votes
1answer
14 views

Python 2.7 Method Resolution Order overrride

I am having some problem using multiple inheritance in Python and can't understand what I am doing wrong. I have three classes A,B,C defined as follows it does not work. class A(object): def ...
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3answers
60 views

Troublesome multi-inheritance code

I'm trying to create a simple Rectangle-class in python, but I also need to use points and sizes in my code, so I'm trying to inherit my Rectangle from Point and Size. The problem is, my Rectangle's ...
0
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1answer
43 views

Multiple inheritance issue, add threading.Thread to the class

First of all let me explain what I want to do: Basic overview: Get data from twitter in one class and print it in another class. Little Deeper: I want CustomStreamListener to be able to run as a ...
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2answers
55 views

Extending from multiple classes in java

i know java doesn't support multiple inheritance. I have 3 concrete base classes say A,B and C. I want to reuse all the utility methods in A,B & C in a single class D.I can not use composition as ...
0
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1answer
30 views

two interfaces, multiple inheritance combine into one container?

I stumbled upon the following problem: I have two packages A and B working fine for each own. Each has its own interface and his own implementation. Now i made a package C combining a adapter of A ...
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0answers
70 views

ASP.Net MVC ActionMailer and custom view engine

I am using a custom view engine in my ASP.Net MVC project to help me deal with multiple sites (mutli-tenancy application) sharing the same code base. I have a base controller from which all my other ...
2
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1answer
46 views

Python: An object constructor calls itself

I have encountered the following code. An object constructor calls itself: class StatusMixin(object): def __init__(self): super(StatusMixin, self).__init__() ...
2
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1answer
69 views

abstract base classes, multiple inheritence, and common pure virtual methods

The following test code seems to indicate that if a class has two abstract base classes with common pure virtual methods, then these methods are "shared" in the derived class. #include ...
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2answers
55 views

c++ invoke base classes' virtual operator== with multiple inheritance

Given the following excerpts: class Interface { public: virtual bool operator==(const Interface &other) const = 0; virtual void print(ostream& sout) const = 0; }; class A : virtual ...
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0answers
32 views

Rails design dilemma: same algorithm, different classes

I'm working on my first Ruby on Rails project and I am now faced with a design dilemma. I'm no professional programmer so I may be missing some pretty basic stuff. Please bear with me. My project is ...
0
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2answers
105 views

C# Multiple Inheritance with Interfaces

public interface IA { void DoSomething(); void Calculate(); } public interface IB { void DoSomethingElse(); void Calculate(); } public class A : IA { void DoSomething() { } void ...
2
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1answer
113 views

c++ virtual inheritance initialization order

Hi, As you can see the Construction order in the example is: – U1 U2 Y X V2 V1 V3 V4 B1 B2 D I understand that : U1 U2 Y X were initialized because the V2 is the first direct virtual inheritance to ...
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2answers
61 views

Doctrine DQL instance of for multi table inheritance entity

I have set up Doctrine multi table inheritance on my application - see below /** * @Entity * @InheritanceType("JOINED") * @DiscriminatorColumn(name="type", type="string") * @DiscriminatorMap({ * ...
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2answers
38 views

Inheriting from a superclass that may be of multiple types in Java

I am writing a game with the libGDX libraries and I have a situation where I have two bounding boxes, for collision detection, one for rotatable objects and one for those that are not rotatable. The ...
4
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2answers
86 views

Error “recursive on all control paths” when copy constructor is used and virtual function present

The error below is confusing me. Here is a short piece of a much more complicated code. It appears strange to me, that only the existence of both a templated constructor and a virtual method cause an ...

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