All of my Visio experience is with LAN/WAN documentation. I recently had a desire to visualize the relationship between objects in the Nagios configuration and I realized I didn't know how to do it properly and moved on to something more important. I was reading the responses to this thread and realized this is something software devel...
The "Question": Is there a way in PHP to overwrite a method declared by one interface in an interface extending that interface? The "Example": I'm probably doing something wrong, but here is what I have: interface iVendor{ public function __construct($vendors_no = null); public function getName(); public function getVendors...
I have always thought that the .equals() method in java should be overridden to be made specific to the class you have created. In other words to look for equivalence of two different instances rather than two references to the same instance. However I have encountered other programmers who seem to think that the default object behavior ...
I have been reading through the C++ FAQ and was curious about the friend declaration. I personally have never used it, however I am interested in exploring the language. What is a good example of using friend? Edit: Reading the FAQ a bit longer I like the idea of the << >> operator overloading and adding as a friend of those classes....
In a world where manual memory allocation and pointers still rule (Borland Delphi) I need a general solution for what I think is a general problem: At a given moment an object can be referenced from multiple places (lists, other objects, ...). Is there a good way to keep track of all these references so that I can update them when the o...
I've got a group of inter-related classes that are all overridden together to create a particular implementation. I'm wondering if it is a good idea to enclose the interrelated subclasses in a namespace. For example purposes, consider the following namespaces and classes: namespace Protocol { public abstract class Message { } publi...
I have a collection of classes that inherit from an abstract class I created. I'd like to use the abstract class as a factory for creating instances of concrete implementations of my abstract class. Is there any way to hide a constructor from all code except a parent class. I'd like to do this basically public abstract class Abstract...
Interfaces allow you to create code which defines the methods of classes that implement it. You cannot however add any code to those methods. Abstract classes allow you to do the same thing, along with adding code to the method. Now if you can achieve the same goal with abstract classes, why do we even need the concept of interfaces?...
So I have a database schema like this: Users UserId RoleUserXRef RoleUserId RoleId UserId Roles RoleId Name With foreign keys defined between User & RoleUserXRef and RoleUserXRef & Role. Basically, I have a one to many relationship between users and roles. How would I model this in dbml, such that the generated Use...
When implementing a needle search of a haystack in an object-oriented way, you essentially have three alternatives: 1. needle.find(haystack) 2. haystack.find(needle) 3. searcher.find(needle, haystack) Which do you prefer, and why? I know some people prefer the second alternative because it avoids introducing a third object. However,...
As far as I can tell, in spite of the countless millions or billions spent on OOP education, languages, and tools, OOP has not improved developer productivity or software reliability, nor has it reduced development costs. Few people use OOP in any rigorous sense (few people adhere to or understand principles such as LSP); there seems to ...
What can be reasons to prevent a class from being inherited? (e.g. using sealed on a c# class) Right now I can't think of any. ...
Let's say I'm writing a PHP (>= 5.0) class that's meant to be a singleton. All of the docs I've read say to make the class constructor private so the class can't be directly instantiated. So if I have something like this: class SillyDB { private function __construct() { } public static function getConnection() { } } A...
Is there a way? I need all types that implement a specific interface to have a parameterless constructor, can it be done? I am developing the base code for other developers in my company to use in a specific project. There's a proccess which will create instances of types (in different threads) that perform certain tasks, and I need t...
When applying the Single Responsibility Principle and looking at a class's reason to change, how do you determine whether that reason too change is too granular, or not granular enough? ...
Since debate without meaningful terms is meaningless, I figured I would point at the elephant in the room and ask: What exactly makes a language "object-oriented"? I'm not looking for a textbook answer here, but one based on your experiences with OO languages that work well in your domain, whatever it may be. A related question that mig...
This might be on the "discussy" side, but I would really like to hear your view on this. Previously I have often written data access classes that handled both reading and writing, which often led to poor naming, like FooIoHandler etc. The rule of thumb that classes that are hard to name probably are poorly designed suggests that this is...
In my browsings amongst the Internet, I came across this post, which includes this "(Well written) C++ goes to great lengths to make stack automatic objects work "just like" primitives, as reflected in Stroustrup's advice to "do as the ints do". This requires a much greater adherence to the principles of Object Oriented ...
I'm trying to set up an inheritance hierarchy similar to the following: abstract class Vehicle { public string Name; public List<Axle> Axles; } class Motorcycle : Vehicle { } class Car : Vehicle { } abstract class Axle { public int Length; public void Turn(int numTurns) { ... } } class MotorcycleAxle : Axle { public bool W...