The composition tag has no wiki summary.
7
votes
2answers
259 views
How do I avoid writing lots of pass-through functions in a wrapper?
I have a class, which wraps another class of a common base type. Because the base type interface is quite large this involves writing a lot of pass-through functions. I am looking for a way to avoid ...
6
votes
4answers
527 views
Looking for a real-world example illustrating that composition can be superior to inheritance
I watched a bunch of lectures on Clojure and functional programming by Rich Hickey as well as some of the SICP lectures, and I am sold on many concepts of functional programming. I incorporated some ...
4
votes
3answers
260 views
what does composition example vs aggregation
Composition and aggregation both are confusion to me. Does my code sample below indicate composition or aggregation?
class A {
public static function getData($id) {
//something
}
...
0
votes
5answers
724 views
Inheritance vs composition in this example
I'm wondering about the differences between inheritance and composition examined with concrete code relevant arguments.
In particular my example was
Inheritance:
class Do:
def do(self):
...
2
votes
7answers
575 views
Inheritance using non-abstract base class
This post is based on the question http://stackoverflow.com/questions/49002/prefer-composition-over-inheritance/11758048#comment15634305_11758048.
Some people said - check whether there is “is-a” ...
3
votes
1answer
268 views
Is this Hybrid of Interface / Composition kosher?
I'm working on a project in which I'm considering using a hybrid of interfaces and composition as a single thing.
What I mean by this is having a contain*ee* class be used as a front for ...
8
votes
2answers
647 views
When Rob Pike says “Go is about composition”, what exactly does he mean?
From Less is Exponentially More
If C++ and Java are about type hierarchies and the taxonomy of types, Go is about composition.
2
votes
1answer
335 views
Composition vs. Inheritance
Here's what is given:
public interface Request {}
// there are 20 subclasses of Request
public class CreateUserRequest implements Request {
@NotEmpty
public String userName;
}
// request ...
3
votes
6answers
497 views
What are the alternatives to “overriding a method” when using composition instead of inheritance?
If we should favor composition over inheritance, the data part of it is clear, at least for me.
What I don't have a clear solution to is how overwriting methods, or simply implementing them if they ...
3
votes
2answers
656 views
OOP - Composition, Components and Composites Example?
I've been reading a bit about OOP in relation to Composition, Components and Composites. I believe I understand the fundamental principle (not sure).
Can someone please provide a code example of a ...
0
votes
2answers
308 views
Is this bad design for a Shape interface?
I'm creating a vector editing program in C++, and I need a Shape interface which other concrete classes will implement. There is a requirement that no implementation inheritance is allowed. The design ...
20
votes
4answers
6k views
Why should I prefer composition over inheritance?
I always read that composition is to be preferred over inheritance. A blog post on unlike minds, for example, advocates using composition over inheritance, but I can't see how polymorphism is ...
0
votes
2answers
193 views
Inheritance versus Composition in a business application
I have a training management and tracking system, with a high level structure as follows:
We have a Role1, e.g. Manager, Shift-boss, miner, etc. and a Candidate, training for that Role. The role has ...
4
votes
1answer
301 views
Model independency in MVC and most efficient way to do method calls
TLDR: Are models supposed to be application-dependant and totally worthless when starting a new application, or are you supposed to design models independently so that they act as stand-alone ...
5
votes
3answers
174 views
How to design a system that allows for multiple parallel extensions of the same “component”?
As a player, I found the following problems about creating and using "extensions" (aka mods) for games:
1) Whenever the game is updated, all the mods break.
2) Most mods don't work with each ...
40
votes
9answers
3k views
What is the most orthogonal programming language?
I find myself repeatedly annoyed by having to teach freshmen about special language rules (like array-to-pointer decay) that have absolutely nothing to do with programming in itself. So I wondered:
...
3
votes
1answer
242 views
Is it possible to refactor inheritance to composition when virtual methods are called inside the base class?
Let's say I have a class called Country and two subclasses called AI and Player. The Country class has a number of virtual methods to allow player-specific or AI-specific behavior.
I want to make it ...
9
votes
5answers
930 views
How do we know to favour composition over generalisation is always the right choice?
Whether an object physically exists or not, we can choose to model it in different ways. We could arbitarily use generalisation or composition in many cases. However, the GoF principle of "favour ...
51
votes
14answers
10k views
Where does this concept of “favor composition over inheritance” come from?
In the last few months, the mantra "favor composition over inheritance" seems to have sprung up out of nowhere and become almost some sort of meme within the programming community. And every time I ...
5
votes
1answer
326 views
Architectural Composition Languages
Recently stumbled upon this paper (PDF) talking about ACLs, or Architectural Composition Languages. They're a fusion of two earlier lines of research: Architectural Definition Languages (such as UML) ...
0
votes
5answers
1k views
Why does the use of interface-based programming appear to be limited to behaviour?
I have been doing a little thinking about inheritance vs. realization vs. composition. I am not about to post the whole detail here. So I was wondering, when we are not talking about creating ...
10
votes
9answers
547 views
Should a developer know the inner workings of the computers' hardware?
I'm not talking just how memory is assigned and memory management (things that you can learn from C for example) but rather the hardware aspect and how each component of the computer hardware works ...
11
votes
6answers
292 views
How do I get a feeling for visual design as a programmer?
Over the last years of web programming, I've noticed how bad I am at designing things. I have substantial knowledge of HTML and CSS, I can make a website look like I want it to, I have some pretty ...
32
votes
9answers
2k views
Code Smell: Inheritance Abuse
It's been generally accepted in the OO community that one should "favor composition over inheritance". On the other hand, inheritance does provide both polymorphism and a straightforward, terse way of ...
