A methodology that enables a system to be modeled as a set of objects that can be controlled and manipulated in a modular manner

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2answers
110 views

How to store state data when the data is related to another entity?

In order to increase the parallel-ability of my objects, I try to make them read-only and include only data that naturally belong to the entity. I have class Object { ... }; class Processor { ...
14
votes
5answers
2k views

When to use inheritance, when to use 'just a boolean field'?

In our Rails application, we are adding notifications. Some of these are blocking: They stop the progress of whatever resource they are added on, because some information on that resource is missing. ...
6
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1answer
99 views

Is it bad to create classes whose sole purpose is to be converted to another class implicitly?

Imagine a situation where we're using a library that allows you to create Circle objects, where you can specify the radius and the center of the circle to define it. However, for some reason, it also ...
2
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1answer
95 views

Create different classes for staffers and users?

I am building a program for a law firm. When a staffer is active (i.e. still works at the firm) he has a password to login the program; When a staffer is inactive (i.e. no longer works at the firm) ...
0
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0answers
27 views

How to calculate new property for old records efficiently?

Let's say we have classes something like this: public class Item1{ public Guid Id {get; set;} public string Name {get; set;} public decimal Price {get; set;} public int Quantity {get; ...
2
votes
5answers
301 views

Why do I need to declare virtual functions as such?

Example: We have a base class Base and three subclasses which all implement their own version of doSomething(). In an intermediate function f(Base b), we want to call the relevant version of ...
0
votes
1answer
75 views

Need help with figuring out a better method of my application layout, please

I am working as the sole .Net developer at a company and I have been tasked with a very large and complex project, an internal intranet site for inventory and time tracking. I have built a project ...
3
votes
2answers
185 views

Web Application: OOP or procedural [on hold]

I'm building a Web Application that includes a search, user profiles, rating, gallery, comments, etc. While writing the outline I was not sure whether to do this by coding the functions directly in ...
9
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4answers
3k views

Can a C struct behave like it had a function?

I use C and structs where a struct can have members but not functions. Assume for simplicity that I want to create a struct for strings that I name str and I want to be able to do str.replace(int i, ...
5
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5answers
262 views

Do you generally send objects or their member variables into functions?

Which is generally accepted practice between these two cases: function insertIntoDatabase(Account account, Otherthing thing) { database.insertMethod(account.getId(), thing.getId(), ...
44
votes
10answers
6k views

Should we avoid custom objects as parameters?

Suppose I have a custom object, Student: public class Student{ public int _id; public String name; public int age; public float score; } And a class, Window, that is used to show ...
2
votes
2answers
121 views

Placing preconditions in the right place

I am trying to figure out the best way to define the responsibility of checking preconditions. Let's consider the following case: we have an Event class representing a sports event and a Matchup ...
5
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1answer
215 views

Why does this shared buffer work?

Background The following code snippet is taken from a problem in, Visual C# 2005: How to Program, by Paul and Harvey Deitel (pp. 735). The code snippet is more or less an application for accessing ...
6
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2answers
225 views

Is Python's inheritance an “is-a” style of inheritance or a compositional style?

Given that Python allows for multiple inheritance, what does idiomatic inheritance in Python look like? In languages with single inheritance, like Java, inheritance would be used when you could say ...
1
vote
2answers
74 views

Implementing an event scheduler for animations

The basic idea is to have some animated widgets that sit in a container, quite similar to Qt (the only actual difference is that my widgets are animated). The animation is in some cases dependent on ...
40
votes
7answers
5k views

How do I prove or disprove “god” objects are wrong?

Problem Summary: Long story short, I inherited a code base and a development team I am not allowed to replace and the use of God Objects is a big issue. Going forward, I want to have us re-factor ...
0
votes
0answers
27 views

I am trying to make a function with that returns true/false if an element is in the vector but I am getting an error? [migrated]

I am trying to implement a function in C++ using STL which takes an object and a vector of objects and return true if the vector contains the object else false. Below is the implementation of the ...
2
votes
2answers
86 views

C++ vs Java: Pointing to Objects

In Java: private State current_state; As "State" is a superclass, I can then assign subclass objects to current_state, effectively making current_state point to a different object: current_state = ...
3
votes
2answers
82 views

Creating Instances from same SuperClass Object

I have 3 subclasses (LowState, MediumState, HighState) which derive from the same superclass (State). Within the superclass, State, I have declared several variables which need to be accessed and ...
7
votes
6answers
389 views

Should instance of Employee contain a reference to instance of Office, or should Office contain an array of Employee?

Title is an abstraction of what I am actually doing, but in essence the same. The main entity I will be dealing with are the Employees themselves; "Send package to employee John Doe". In order to ...
8
votes
7answers
419 views

Design pattern for “operation on object allowed, only if object is in certain state”

For example: Only job applications that are not yet in review or approved, can be updated. In other words, a person can update his job appliance form until HR starts reviewing it, or it's already ...
3
votes
4answers
224 views

From the perspective of OOP, taking performance into account - should a database connection be a static field, an instance field, or a local variable?

When methods use a database connection, should the connection be a static field, an instance field, or a local variable? Here are my doubts. I dithered which are correct and which are baseless. I ...
1
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2answers
44 views

Ways to structure a program with 2 states

I'm working on some sort of a Level Editor but I'm not quite sure how I want to handle the two different states: The Editor state and the Player state. In this first state game elements can be moved ...
1
vote
1answer
15 views

In what sense does the complexity of class hierarchies motivated by static type checking?

For example, from the book JavaScript: The Good Parts, I stumbled upon this passage: Much of the complexity of class hierarchies is motivated by the constraints of static type checking. ...
19
votes
6answers
2k views

Is it okay for interfaces to contain a method which returns the concrete type of the implementation in form of a constant?

I very often get myself in a situation where I need a different behavior of a component which depends on the concrete type of a different Interface. To illustrate my question, I have written a small ...
4
votes
6answers
559 views

How much do function calls impact performance?

Extracting functionality into methods or functions is a must for code modularity, readability and interoperability, especially in OOP. But this means more functions calls will be made. How does ...
5
votes
3answers
136 views

Breaking large class into smaller classes when they need a common state?

I am writing a parser for a fairly complicated language in C++. The Parser class is given a list of tokens and it builds the AST. Though only a part of the parser is completed, the Parser.cpp file is ...
47
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20answers
11k views

Does Object Oriented Programming Really Model The Real World? [closed]

I've seen it commonly repeated the object oriented programming is based on modelling the real world, but is it? It seems to me that is not true of anything outside of the business layer. My GUI ...
4
votes
2answers
87 views

Serializing mutating objects

In our system a media file can have several states: invalid, empty, uploading, ingesting, ready… Depending of the state, information about the media are accessed in different ways. For example, during ...
-1
votes
3answers
55 views

What do you call the two types of classes on a instance declaration

When you declare a new instance of a class, you do so in a lot of languages as: MyClass obj = new MyClass(); The two MyClass mean subtly different things, often you will see: IMyClass obj = new ...
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2answers
173 views

OOP project design

here is the UML class diagram subscribe method is used to add a herbivore object to the plant's watchers. when a plant is told to notify, itloops through all of the herbivore object in its watchers ...
5
votes
4answers
779 views

Why not apply Interface Segregation Principle to “extreme”

Providing that clients would typically consume just one method, though methods would be conceptually related, why not always apply the Interface Segregation Principle to the extreme and have [many] ...
0
votes
3answers
209 views

DDD Request Validation Handling

I stuck somewhere that I can't find a solution! There are plenty of validation questions here, but as far as I see, most of them were asking about entity validation. But what about request validation? ...
2
votes
2answers
170 views

How to avoid circular reference in OOP Javascript?

I have a problem while working with entity framework in JavaScript. I have two classes Table and Column Class Table { Columns: Column[] } Class Column { Parent: Table } Everything works fine until ...
1
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1answer
21 views

Redesigning schedule value hierarchy

I have a couple of schedule value classes that represent the value a schedule holds for a specific slot. First, there's the ScheduleValue class for schedules with two dimensions, where the first one ...
0
votes
3answers
158 views

Is data duplication bad in programming (in contrast to database designing)?

I have three classes: User, Conversation and Message: Message properties: User sender; // Some more Conversation properties: List<Message> messages; List<User> participants; // Some ...
0
votes
1answer
107 views

Question(s) about PHP PDO connections

Let's say I have a Db class [ db.php ] : <?php class Db { // class properties private $db_driver = ''; // dsn credentials private $db_dhost = ''; private ...
2
votes
2answers
109 views

Should we add an extra class to this code sample

I have a shopping website which allows users to place orders. In my web application when the users click 'Create Order' i call an OrderService class which looks like the below: public class ...
0
votes
2answers
232 views

Don't auto-implemented properties violate encapsulation?

In C#, when a field getting or setting requires logic, we use properties. For example: private int _age; public int Age { get { Console.Writeline("Club member is {0} years old", ...
1
vote
1answer
64 views

In a .NET Windows Forms app with a custom MVC, should a custom UserControl (view) implement any non-animating logic on its own?

This is strongly linked to these two questions: http://stackoverflow.com/q/15800945/279112 Should Controller know about View & Model? or vice versa? as well as this one: ...
1
vote
3answers
96 views

Xml Messages: One Type to Rule Them All?

My job involves a project that has a lot of different pieces that all need to communicate via XML messages. There are two schools of thought on how these messages should be organized. In reality ...
2
votes
2answers
114 views

Design of object alias

Suppose you develop an interpreter or file system. There are objects, like variables, procedures and files in some environment. They have a name and content (variable has current value, procedure has ...
2
votes
1answer
124 views

Fine tuning details in C++ function for different customers

The company I work for follows a business model where a core product exists (originally written in C, now in C++) with some default implementation but details are tailor-made for each customer (there ...
1
vote
1answer
105 views

How to compute Pricing of Product & Options based on User Option Selection and Pricing per Option

I am building a service for pricing options of a product and for pricing the product itself when product has various options. Example User selects some X options out of Y options available, where X ...
4
votes
2answers
236 views

Why is an abstract class forced to define all functions of an inherited interface?

Why does c# compiler force an abstract class to define (as opposed to implement) all the methods of the inherited interface ? why does it not mark unimplemented methods of an inherited interface as ...
0
votes
1answer
108 views

How to call an unknown member function through an instance of a related class?

I have two classes. The first, called Game_Events, controls the objects and manages the general tasks. The second, called Button, is for one of those object instances. The example below is wrong but ...
6
votes
2answers
153 views

Is there such a thing as a workflow pattern? or how to do a workflow properly?

(and alternatives to a workflow engine) Problem: I have various inputs with various attributes. For example {name: john, country: US} and {name: Jose, country: MX} And I have the following workflows ...
27
votes
11answers
2k views

Did a gradual shift in methodology of writing code affect system performance? And Should I care?

Lest you be confused by what's to follow, here is the driving idea behind the question: I always intended the question to be what it is. I may not have articulated it well originally. But intent ...
-1
votes
1answer
150 views

What is the faster way to save and browse objects using vectors +/or maps? (c++)

I'm doing a object Garbage class using c++: #include "Object.h" class ObjectGarbage { public: ObjectGarbage(); ~ObjectGarbage(); void Call_All_Objects() { ...
7
votes
3answers
216 views

Using Interfaces for Loosely Coupled Code

Background I have a project that depends on the usage of a certain type of hardware device, while it doesn't really matter who makes that hardware device as long as it does what I need it to do. With ...