One of the four pillars of object-oriented programming (OOP), inheritance establishes a "is-a" relationship between objects. For example, a "Cat" object can be treated in code as any other "Animal" object because a "Cat" is-a "Animal".

learn more… | top users | synonyms

3
votes
1answer
95 views

Using composition instead of inheritance

I have been using Entity Framework 6, AutoMapper, ASP.NET Web Api and hit a few problems along the way, each time it was recommended that I could change my code from Inheritance to use composition ...
2
votes
1answer
47 views

Generic classes with inheritance/equals/comparison operators

I would like to greatly reduce verbosity of following code fragment. What I'd like to do: Reduce number of occurrences of MaterialRangedParam<Value> and ...
6
votes
2answers
104 views

System for registering people

For a small administrative program, I have to be able to register people and their data. But, files are sometimes created through a phone call "on the fly" and then later certain data is added to the ...
4
votes
1answer
45 views

Generic Pickle-Aware Super-Class for Mixing Classes with and without __slots__ in Python

I want a generic super-class that I can easily subclass - and if desired add slots to my class - without having to worry about any pickle issues (with the lowest protocol). Is this in general a good ...
2
votes
0answers
40 views

MultiLevel JavaScript Inheritance

I'm making an experiment on JS, trying to build a framework for OOP. It's called Universe. The main purpose is to emulate a mini-universe, where classes are "created" with a defined behavior ...
3
votes
3answers
173 views

Implementing sequence abstraction

Below is the code that implements sequence abstraction using type abstraction Sequence (in Java): ...
3
votes
1answer
79 views

Calling common async code from a derived method

I'm implementing a number of classes in C# that have async methods. However, each of these methods needs to implement some boilerplate code that is common to all. Therefore I've implemented the common ...
16
votes
5answers
1k views

Implement a Shape abstract class

To learn more about OOP, @nhgrif challenged me to implement a Shape abstract class (more details in code remarks below. Here is how I did it. Any and all advice appreciated! Shape.java ...
5
votes
2answers
131 views

Strategy Game Menus and OOP

Most of my experience is with Objective-C, so I am relatively new to Java inheritance. I understand that there are concepts such as abstract classes and interfaces, but I am still not totally sure ...
10
votes
2answers
328 views

Decomposing the animal kingdom

I have implemented a Mammal class hierarchy in Java. Is it an intelligent approach, with respect to decomposition, locality and procedural abstraction? ...
0
votes
1answer
61 views

A Singleton Base and derived class

I have a base and derived class since I need to have different kinds of concrete classes. I cannot use the getInstance() function in the base class since I cannot ...
2
votes
1answer
75 views

Creating users with different roles using .Net Identity 2.0 within Entity Framework

I am using .Net Identity 2.0 with Entity Framework 6.0. I have a Person class inheriting IdentityUser. I have a ...
2
votes
1answer
131 views

Dumping fields from Python objects

I am writing a small class that has one method: get_state. It is parameterless and returns a dictionary of all the names in self (look in its dict) that are not ...
8
votes
2answers
229 views

Video Store Rental Application

I'm in the middle of developing a video store rental application for a school project but am starting to question whether I'm going about things in the correct manner. Although the application is ...
4
votes
0answers
55 views

Follow up on CRTP with multi-level hierarchy

I was working on a similar problem to this post, asked a question on the Eigen Mailing List, and Gabriel pointed me to the above post, from which I was able to get my code working again. He further ...
3
votes
1answer
91 views

Generating a zoo of animals

The pattern I've come up here is for the AnimalGenerator itself, outside of the (abstract) Factory Pattern used within it. The factory classes themselves are not ...
8
votes
2answers
90 views

Inheriting methods of an immutable type

In my project, I have a type BalanceByBucket that is an immutable type and has a bunch of methods. I have another class called a ...
3
votes
1answer
43 views

Emulating class extending

I'm using the following piece of JavaScript to emulate class extending. Is this a valid way to go or does it have some drawbacks which should definitely be fixed? ...
3
votes
1answer
63 views

Seeking proper system for pairing types

My code below ensures that only land animals can be a "representatives" for Land while only ocean animals can be representatives for ...
2
votes
1answer
221 views

Displaying a list of players and their leagues

My question is mostly directed towards the principles of object-oriented programming. I have an Android application and one of the activities has a ListView. In ...
4
votes
1answer
71 views

Design/reiterate or code reuse for linked list

This is what my class hierarchy looks like. I have an abstract superclass, AbstractLinkedMyList, that contains common operations for both sorted and unsorted linked ...
6
votes
0answers
65 views

Possible class redundancy and improper enum usage

I am looking for code correctness and design usage as I think I might be over doing it in the class department. There are two things I'm mostly concerned with. The possible redundancy of classes ...
3
votes
0answers
65 views

Implementing Simple and Fast Inheritance in JavaScript

I have been using the John Resig JavaScript class implementation in my web apps, but the tests shows it is really slow. I really find it useful for the way of extending objects, and the benefits got ...
7
votes
1answer
206 views

Multiple inheritance with JavaScript with support of calling of super() methods

I have just finished working on a Node.JS module that provides "multiple inheritance that works". I had some really specific requirements: Works in safe mode Auto-calling of parent constructors ...
7
votes
1answer
83 views

Polymorphic animals speak their name and make a noise

I'm new to GNU Smalltalk. I'd like to port a script I've written in Ruby, Scala, CoffeeScript, and several others. It's the one I use to try to learn the classic OOP concepts of abstract classes, ...
3
votes
1answer
45 views

How can I ensure some structure for classes for a plug-in system written in Python?

I have written a toolkit (hwrt) which has a plugin system. One type of plugin is a feature (see this) for many of them. There are some restrictions of feature ...
2
votes
2answers
93 views

Downcast all elements from a list using static_cast

So I have this code: ...
1
vote
0answers
84 views

Testing with multiple input datasets and expectations

I wanted to make 3 test suites where each would run a test class with a specific input. I figured that in order to do this I could: Make an abstract test suite with all the variable parts (...
4
votes
2answers
112 views

Should I create an abstract runnable? I've 4 sub-classes which perform similar work but only 3 of them have identical constructors

I've added the code for an abstract thread class and 2 sub-classes. The structure and job of the threads (sub-classes) is identical except one difference: ONE of ...
6
votes
2answers
96 views

Using a CRTP approach for loading OpenGL programs

I wanted to try using CRTP (also new for me) to try making the loading of shared resources implicit. (Specifically I'm using it for loading OpenGl shader programs) This will also help separate some ...
3
votes
1answer
97 views

Implementing binary output to a file in C++11

I would like to have a class which supports outputting bits into a file. This is what I came up with but I fear there are many poor decisions. Should I inherit from a ...
4
votes
2answers
94 views

Setting a common background image on a dozen screens

Is there something as "they have too little in common to use a superclass"? In my case, doing iOS programming, in a project, every screen has the same background. So I created a superclass which only ...
4
votes
2answers
115 views

Inserting and displaying books

I'm trying to write a program where you can insert and display some books (without using a database). For doing this, I use three classes: Book - is the base ...
8
votes
1answer
707 views

Solar System model: Moving Space Balls

I have a model of the solar system that I'm working on at the moment. Now is the time to start cleaning my code up a little. Here's what I have so far: A main 'driver' method: ...
2
votes
2answers
160 views

Custom TextBox control: AppendLine

Is there any way to improve this simple addition to the textbox control: appending a new line? ...
5
votes
1answer
60 views

Object.extends in JS

I built an easy inheritance implementation for JavScript that works similar to other OO languages and wanted some feedback on it. This works perfectly how I'd like it to, but I've read a lot of ...
6
votes
2answers
492 views

Simple PHP inheritance using an abstract class

I have created simple class inheritance of an abstract class Pet which is basically the skeleton of all other children classes. ...
5
votes
3answers
451 views

DRYing out some Java code and tests

I am writing some tests that all follow the same pattern, I feel like repeating myself over and over again, how can I reduce the repetition? The (almost) repeating part is in constructor and the class ...
6
votes
2answers
297 views

Layer Stack class to practice std::shared_ptr

The following three source files is to define and test a class StackLayer. While it was written in a need for scalable layer-based architecture design, it was also ...
1
vote
1answer
75 views

Duplicate code in similar classes where I cannot add more inheritance

I'm building a .NET Linq-esc query builder for my application and I'm wondering about my implementation and code structure when it comes a few classes. Basically I'm creating a query builder for SQL, ...
3
votes
3answers
79 views

Working with Classes (inheriting), @ properties and Initialization

I'm working on this Objective C programming assignment I found online. I'm not sure if I have met all the requirements, especially part C. Any help or suggestion will be appreciated. Part 6 ...
14
votes
4answers
2k views

Reusability vs simplicity in a small game with a set of interfaces

I have a small game I'm working on with a set of interfaces: IHavePosition: ...
2
votes
2answers
77 views

Generate the Norwegian equivalent to social security numbers - follow-up

First of, here is my previous post. That should explain a fair bit. The reason I'm posting one more time, is I have changed a lot. Using more classes, let them do all the work, and the overall ...
1
vote
1answer
124 views

Simple JavaScript inheritance

I'd like to know what you think about my implementation of inheritance. It's pretty small and intuitive I think, but I don't know if there are any drawbacks. I really want to keep it as simple as ...
13
votes
2answers
570 views

Encapsulated text-based RPG using a randomized combat system

For my rags-to-riches submission, I've decided to improve this code: Text-based RPG game using classes However, I've decided to start off with something different. The original code is more ...
2
votes
1answer
140 views

Many interfaces and lots of inheritance vs few interfaces and less inheritance? [closed]

I have a Visual Studio Solution which has a bunch of Projects in it. One of these projects is called "Services" and is basically the junction point between all remaining projects. When I built it ...
2
votes
0answers
53 views

Namespace handling on nodejs and inheritance managing

It should solve the following issues: Handle namespaces; Be a class factory from Pojos Be a object factory Create a class with inheritance capabilities from a POJO using john resig inheritance ...
5
votes
2answers
98 views

When should I actually derive from my interface?

Context: I am working on an XNA project, and since procedural generation is likely to be used, I wanted to eventually create a helper class to work with data to facilitate that. Design Goal: ...
2
votes
1answer
109 views

Using a decorator to apply an inherited method to all child objects of the inherited type

I wanted to share this and get some feedback. My goal was to be able to have an object with methods: ...
5
votes
3answers
77 views

Cons of declaring derived class type member in another derived class (both of which share the same base class)

I'd like some input on the way I've structured some things in a side-project I'm working on. I declare an abstract class, CelestialObj, which will contain the ...