General guidelines on how to design classes with best known industry practices.

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10
votes
6answers
2k views

At what point do immutable classes become a burden?

When designing classes to hold your data model I've read it can be useful to create immutable objects but at what point does the burden of constructor parameter lists and deep copies become too much ...
69
votes
9answers
6k views

Is there any “real” reason multiple inheritance is hated?

I've always liked the idea of having multiple inheritance supported in a language. Most often though it's intentionally forgone, and the supposed "replacement" is interfaces. Interfaces simply do ...
14
votes
9answers
2k views

Isn't class scope purely for organization? [duplicate]

Isn't scope just a way to organize classes, preventing outside code from accessing certain things you don't want accessed? More specifically, is there any functional gain to having public, protected, ...
1
vote
4answers
523 views

c++ coding practice class vs. “free” functions

I am currently writing my first bigger project in c++. Its basic linear algebra. I am aware that boost libraries and others exist, but for various reasons I need to write my own. Purpose of the ...
0
votes
3answers
226 views

How do you balance out code structuring (few big functions vs. many small ones)?

The golden rule of code structuring is always said as splitting into many sub functions is a good thing. Though I noticed it becomes a problem in complex applications when a class of e.g. 10 bigger ...
19
votes
2answers
1k views

Is it a good idea to provide different function signatures that do the same thing?

Here is a C++ class that gets constructed with three values. class Foo{ //Constructor Foo(std::string, int, char); private: std::string foo; char bar; int baz; }; All of ...
0
votes
3answers
270 views

Force Derived Class to Implement Static Method C#

So the situation is like, I have few classes, all of which have a standard CRUD methods but static. I want to create a base class which will be inherited so that it can force to implement this CRUD ...
0
votes
2answers
957 views

A sample Memento pattern: Is it correct?

Following this query on memento pattern, I have tried to put my understanding to test. Memento pattern stands for three things: Saving state of the "memento" object for its successful ...
49
votes
12answers
4k views

Is it bad practice to pass instances through several layers?

In my program design, I often come to the point where I have to pass object instances through several classes. For example, if I have a controller that loads an audio file, and then passes it to a ...
9
votes
5answers
1k 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 ...
13
votes
4answers
2k views

Is It “Wrong”/Bad Design To Put A Thread/Background Worker In A Class?

I have a class that will read from Excel (C# and .Net 4) and in that class I have a background worker that will load the data from Excel while the UI can remain responsive. My question is as follows: ...
8
votes
4answers
4k views

Use Dependency Injection For Data Objects?

I'm just learning about dependency injection, and am stuck on something. Dependency Injection recommends sending dependent classes through the constructor, but I'm wondering if this is necessary for ...
11
votes
4answers
2k views

Object Oriented Programming: getters/setters or logical names

I'm currently thinking about an interface to a class I'm writing. This class contains styles for a character, for example whether the character is bold, italic, underlined, etc. I've been debating ...
9
votes
5answers
3k views

Interface and Inheritance: Best of both worlds?

I 'discovered' interfaces and I started to love them. The beauty of an interface is that it is a contract, and any object that fulfills that contract can be used wherever that interface is required. ...
11
votes
4answers
6k views

C++ - Constructor or Initialize Method to Startup [duplicate]

Possible Duplicate: Avoid having an initialization method I want to determine when to do non-trivial initialization of a class. I see two times to do initialization: constructor and other ...
2
votes
2answers
2k views

What is the best way to work with DAL and BLL?

I'm currently refactoring my DLL and BLL and I need some advice on what is the best way to work with DAL and BLL. My current solution is like this: // DAL class only consists of SQL queries and ...
2
votes
2answers
610 views

One boilerplate class or many similar classes?

Lets say I'm trying to model a variety of objects that are virtually identical, the only difference being their class variables. Am I better off creating one boilerplate class and just calling the ...
1
vote
1answer
97 views

When should I pass value as class variable and when as a method argument?

Is there a general rule of thumb, when we should pass a value as as class variable and when as a method argument? Or is it just a choice of the developer? For example -- are there any reasons, why ...
0
votes
2answers
214 views

How To Invoke A Method When It's Class is Accessed (Any Method) - “OnClassEnter”

I am working on a C# net micro framework project, in particular an I2C bus management/class. I have several different I2C devices each defined in separate classes which contain all of the devices' ...