I'm looking for something relatively simple to spec out a class hierarchy for C++. Can cost $ but preferably something free or at least simple and not overly feature laden and $$$. ...
I am trying to use the repository pattern in an instance of storing pictures. What I do is save the actual pics in a directory on disk but save data about the pics and what pics go with what object in a database. I was wondering if I should use 2 interfaces for the storage, like IStorePicRepo and IStorePicDataRepo or have 1 interface ...
Hello. I've a need to add method that will calculate a weighted sum of worker salary and his superior salary. I would like something like this: class CompanyFinanse { public decimal WeightedSumOfWorkerSalaryAndSuperior(Worker WorkerA, Worker Superior) { return WorkerA.Salary + Superior.Salary * 2; } } Is t...
Anyone who has programmed with actionscript 3.0 has most certainly noticed its lack of support for private constructors and abstract classes. There are ways to work around these flaws, like throwing errors from methods which should be abstract, but these work arounds are annoying and not very elegant. (Throwing an error from a method tha...
Hi, I want to build a nice API (C#) to make it easier for people to consume, I think I've seen this before and want to know how to do this: MyNamespace.Cars car = null; if(someTestCondition) car = new Honda(); else car = new Toyota(); car.Drive(40); Is this possible? If so, what needs to be done? ...
Why doesn't the following work (Python 2.5.2)? >>> import datetime >>> class D(datetime.date): def __init__(self, year): datetime.date.__init__(self, year, 1, 1) >>> D(2008) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: function takes exactly 3 arguments (1 given) I wanted to c...
Hey all, Recently I heard that there are 9 rules for OOP(Java). I know only four as Abstraction, Polymorphism, Inheritance and Encapsulation. Are there any more rules for OOP? ...
After some years of experience in the field, it seems to me that the Factory pattern is one of the less interesting and useful patterns around when not writing frameworks or libraries. I'm not saying that Factory pattern is unnecessary. For example, the W3C Document interface serves as a factory for various XML nodes (elements, attribut...
I was once asked in an interview 'What are the 3 main concepts of OOP?'. I answered by saying that in my opinion there were 4 which are as follows: Inheritance Encapsulation Abstraction Polymorphism Was I correct? ...
Say you have these two methods: Number 1: void AddPerson(Person person) { // Validate person if(person.Name != null && IsValidDate(person.BirthDate) DB.AddPersonToDatabase(person); } Number 2: void AddPerson(string name, DateTime birthDate) { Person p = new Person(name, birthDate); DB.AddPersonToDatabase(person); } Wh...
Hi Guys, In my quest in trying to learn more about OOP in PHP. I have come across the constructor function a good few times and simply can't ignore it anymore. In my understanding, the constructor is called upon the moment I create an object, is this correct? But why would I need to create this constructor if I can use "normal" functio...
Netbeans tells me it's bad to access a static method from a non static method. Why is this bad? "Accessing static method getInstance" is the warning: import java.util.Calendar; public class Clock { // Instance fields private Calendar time; /** * Constructor. Starts the clock at the current operating system time *...
This project started as a development platform because i wanted to be able to write games for mobile devices, but also being able to run and debug the code on my desktop machine too (ie, the EPOC device emulator was so bad): the platforms it currently supports are: Window-desktop WinCE Symbian iPhone The architecture it's quite compl...
Is it a good concept to use or I can do other things in place of this? ...
Hi, I'm making a game engine in c++ and python. I'm using OGRE for 3D rendering, OpenAL for sound, ODE for physics, OIS for input, HawkNL for networking and boost.python for embedded python interpreter. Every subsystem (library) is wrapped by a class - manager and every manager is singleton. Now, I have a class - Object - this could be ...
I have an application that imports information from a CSV file or from a database and exports it to XML. This XML is currently being persisted to a file. However due to project needs I have decided it may be better to persist this XML to a database. Currently I have CSV, XML and SQL repositories that deal with importing/exporting data. ...
I've looked at other definitions and explanations and none of them satisfy me. I want to see if anybody can define polymorphism in at most two sentences without using any code or examples. I don't want to hear 'So you have a person/car/can opener...' or how the word is derived (nobody is impressed that you know what poly and morph means)...
Code that is untestable really annoys me. The following things make oo-code untestable: global states, e.g., the Singleton Design Pattern static methods that do some fancy work e.g database access deep inheritance tree work in constructor e.g. control statements classes that violate the Single Responsibility Principle Are there more ...
Hello together and a happy new year 2009! I am programming a simulations for single neurons. Therefore I have to handle a lot of Parameters. Now the Idea is that I have two classes, one for a SingleParameter and a Collection of parameters. I use property() to access the parameter value easy and to make the code more readable. This works...
I'm still struggling a bit with OOP concepts and dependency injection so bear with me. I have generated my Linq2Sql model with a User table and now I would like to be able to send a confirmation email to this user so I created a partial class file for my User object and I felt it was natural to add a SendConfirmationEmail() method to th...