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1
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1answer
88 views

How to get a reference to a central AssetLoader in every Widget?

I'm working on a simple UI system for a game. The building blocks are Widget objects, which can contain each other. There are several sub classes of Widget, e.g. LabelWidget, ImageWidgetand ...
3
votes
3answers
639 views

Why don't we use a class and its static members to do what a singleton does?

In Java,C++,Objective C, C#, and all other similar OOP languages, Why don't we use a class with static methods and vars instead of going through a singleton syntax having to deal with various ...
5
votes
4answers
1k views

Is there something like a polymorphic Singleton?

I have a resource loader object that loads objects from the disk or from a ZIP archive, depending on the platform. It has state (e.g. the path to the directory or the ZIP archive, and possibly some ...
3
votes
3answers
9k views

Static class vs Singleton class in C# [duplicate]

Possible Duplicate: What is the difference between all-static-methods and applying a singleton pattern? I need to make a decision for a project I'm working of whether to use static or ...
5
votes
3answers
2k views

How to create a manager class without global variables nor singletons?

I would like to implement some kind of manager class in my application. It will be in charge of loading textures, processing them, distributing them etc... At first, I wanted to make a global ...
0
votes
5answers
583 views

should singleton be life-time available or should it be destroyable?

Should the singleton be designed so that it can be created and destroyed at any time in program or should it be created so that it is available in life-time of program. Which one is best practice? ...
3
votes
2answers
1k views

null values vs “empty” singleton for optional fields

First of all I'm developing a parser for an XML-based format for 3D graphics called XGL. But this question can be applied to any situation when you have fields in your class that are optional i.e. the ...
1
vote
3answers
253 views

Name for Osherove's modified singleton pattern?

I'm pretty well sold on the "singletons are evil" line of thought. Nevertheless, there are limited occurrences when you want to limit the creation of an object. Roy Osherove advises, If you're ...
26
votes
7answers
2k views

The Singleton Pattern [duplicate]

Possible Duplicate: When is Singleton appropriate? I am a new programmer (4 months into my first job) and have recently taken an interest in design patterns. One that I have used recently ...
3
votes
3answers
2k views

Is the singleton pattern prone to thread safety problems?

Is the singleton pattern prone to thread safety problems? If so, what are the best methods to work around them?
4
votes
1answer
850 views

DAO/Webservice Consumption in Web Application

I am currently working on converting a "legacy" web-based (Coldfusion) application from single data source (MSSQL database) to multi-tier OOP. In my current system there is a read/write database with ...
0
votes
2answers
244 views

Template rendering engine legitimate use of a singleton?

I wrote a standalone singleton class (scaffold) tonight that serves as a facade to a few other classes, including a template class and a view class. Templates and views are both named and instances ...
1
vote
5answers
507 views

Does “Property” in C# cost much?

I have a class created in some namespace, like SomeNameSpace.SubNameSpace.StaticClassName Here is a code snippet from other code file where I want to use this class many more times, so I created a ...
-1
votes
1answer
853 views

What is the difference between class level attributes, Class constants and singleton methods?

What the difference given they all exist 'once per class'. When should I use one over another, i.e. for what purpose? I use Ruby.
14
votes
7answers
9k views

What are the roles of singletons, abstract classes and interfaces?

I am studying OOP in C++ and, even though I am aware of the definitions of these 3 concepts, I cannot really realize when or how to use it. Let's use this class for the example: class Person{ ...
22
votes
9answers
7k views

Alternatives to the singleton pattern

I have read different opinions about the singleton pattern. Some maintain that it should be avoided at all costs and others that it can be be useful in certain situations. One situation in which I ...
6
votes
4answers
1k views

C++ - Best way to have a central data repository

I'm coding in C++. I have a server that will have clients connect to it, and each client gets spun off into its own thread for communication. This server is hosting a game, so there is information ...
12
votes
5answers
928 views

What to say to your boss if they want you to use a global variable

I am currently 4 months into an internship, and when reviewing my code, my boss didn't like that I had kept a specific object local to a number of methods across a few separate classes within one ...
1
vote
3answers
618 views

Memory problems with singletons in a test suite

I am having a memory leak when running a test suite due to singleton objects are created and not cleared after each test case. And these singleton objects are holding references to heavy objects. So ...
8
votes
4answers
469 views

Is there is a case when there is no any reasonable replacement for singleton design pattern? [duplicate]

Possible Duplicate: When is Singleton appropriate? I've seen many explanations why is Singleton is evil. But is there really no such a case when Singleton is the only beautiful solution?
0
votes
1answer
156 views

Is using Singleton correct for Jtree & DefaultTreeModel?

Basically I have one Tree view which uses a single DefaultTreeModel. Is it okay to use singleton for Tree extending JTree and another singleton for TreeModel extending DefaultTreeModel? If not, what ...
5
votes
2answers
380 views

Are the default objects of VB a type of singleton?

Are the default objects supported by My keyword in VB.net is a kind of singleton? If not, what is the difference? Again is this "default object" feature is something useful? If yes, then why it is ...
11
votes
4answers
950 views

Does “notification center” pattern encourage good or bad program design?

Sometimes I come across these message-hub-style APIs, for example the Cocoa NSNotificationCenter: ...