Questions tagged [class]
A template for declaring a type of object.
271
questions
-1
votes
2answers
50 views
What approach is commonly used when a generic object needs to be converted into a specialized object?
Let's say I have an instance of a superclass and at a later stage this object needs to be converted into a subclass instance (based on additional information that are stored in the object).
Is it ...
-1
votes
3answers
169 views
How to reduce the number of classes in a project?
i'm trying to design a game program, but when thinking about which objects to introduce there seems to be far too many.
For example for main object "Player" there are a lot of peripheral ...
0
votes
2answers
77 views
Can and should constructors do more work than merely assigning values to fields? [duplicate]
A typical introductory example to OOP, classes, and constructors is object Car, with properties such as float fuel, bool is_engine_running, etc etc, and a class and constructor definition might be as ...
0
votes
2answers
82 views
using-declaration or typedef for iterator tags?
I'm creating a class representation of a mathematical tuple (or simply, an ordered set of numbers). Being a list-like object that could benefit from an iterator representation, I have decided to give ...
8
votes
3answers
2k views
Is it best practice to define a member function directly in a class?
I'm a beginner in C++, and I was wondering if it is best practice to define a member function directly in a class, such as:
// something.hpp
class C {
inline int func() { return ... ; }
}
rather ...
-1
votes
3answers
265 views
What are the differences between Class Oriented Design and Object-Oriented Design?
I saw an answer on SO which said that just having a class with methods doesn't make it OOP and that it represents Class Oriented Design.
I'd like to hear the differences between Class Oriented Design ...
-1
votes
3answers
210 views
Does wrapping functions/'things' in classes reduce efficiency?
I was reading some C++ object-oriented programming notes that mentioned that we should avoid wrapping functions in classes if it is not required, since wrapping 'things' in classes would reduce ...
1
vote
0answers
93 views
Is using C++ Classes to handle commonly used parameters a misuse of classes?
My team works on an HTTP web server in C++. The codebase has aged over time, and has a widespread problem of 12+ parameters being passed to every function.
A fake example: We need to build a Car, but ...
5
votes
4answers
305 views
How to deal with different level of abstractions (blurred line between data and models)
My question is about the way to represent data models created at runtime.
To illustrate, let's say we would like to create a CMS-like app in which end-users may create custom forms.
Those forms are ...
0
votes
3answers
66 views
“Assign” Role Association between two classes
If there is Class A and Class B and there is an association that B can be assigned to A.And the multiplicity is 1:M or M:1 from A to B.Example:
1.Room has Collection of Keys, and Key can can assigned ...
2
votes
3answers
178 views
Enums or Multiple Inherited Classes
I am reading about OOD and came across Parking lot design problem.Parking lot has parking floors which has parking spots.The parking spot class looks as follow:
public enum ParkingSpotType {
...
2
votes
0answers
34 views
Update class member gradually [duplicate]
Consider the following:
import typing
class MyClass(object):
def __init__(self):
self.my_member: typing.Optional[dict] = None
def update_member(self):
self.my_member = {}
...
0
votes
4answers
399 views
Why have separate keywords for 'extends' and 'implements' in Java? [closed]
Short answer that I've come to accept:
Firstly, it helps with readability, being able to see which is the superclass apart from interfaces. Secondly, though 'extends' and 'implements' do the same ...
1
vote
2answers
142 views
Going from Javascript to C++. I have teacher and student objects, and I want to display if they are teachers or students. How should I do this?
This may be too general of a question, but basically whenever I try to find an answer for something that would work from a Javascript approach, the answer heavily implies that you wouldn't do it that ...
1
vote
2answers
198 views
Is there a statically typed programming language that implements Polymorphism without using a superclass or an interface?
Is there a statically typed programming language that implements Polymorphism without using a superclass or an interface (if such implementation is even possible)?
0
votes
2answers
485 views
Terminology: Classes that contain only methods [closed]
I am studying the programming language Kotlin, and I just came across the idea of a Data Class. I have a background in Java programming where classes can have fields and methods. I have heard ...
0
votes
1answer
120 views
How to deal with metaclasses in strong-typed language : is it ok to mix classes and metaclasses?
I'm working on a programming language design ans I'm struggling with how I should type the concept of Class.
Let me show you some code to illustrate my problem :
class MyClass
{
}
function ...
8
votes
1answer
646 views
Why List<T>.Enumerator is struct?
During my investigations of List<T> enumeration I noticed List<T>.Enumerator is struct. In opposite for instance to System.Array.SZArrayEnumerator or System.SZArrayHelper....
-3
votes
1answer
66 views
How do I find out all modifications made by installing software? [closed]
So I want to find out how to get a list of all modifications made by installing a piece of software.
For example. If I install Word, I want to see all directories created, classes registered, dlls,
...
-2
votes
3answers
965 views
Accessing one class variable from another class in C++
Suppose I'm in some function of class A, in this function I define an object of class B, say b, and call some function using b.func() which updates some values and arrays, say x and A. Then, I create ...
-1
votes
2answers
106 views
Do I name classes based on the object type they represent or the responsibility they have?
The more I read about the Single Responsibility Principle the less I see a class as an object type, but rather as a servant that does something.
For example, let us suppose we have a new requirement ...
0
votes
1answer
78 views
Inheritance but with two different shared traits?
I am facing a dilemma with designing an api gateway. Currently, I am using the pipeline pattern, with different stages being the requests made to various services, (http, sockets, amqp, ...).
I have ...
-2
votes
1answer
676 views
Why would you make a struct without typedef?
Since I cut my teeth on code with OO, I’m biased toward using structs as classes without methods. However, there’s probably a good reason that typedef isn’t the default behavior of struct. What is it?
4
votes
3answers
416 views
Struct or class for wrapping an int when 0 isn't a valid value
I have a business object which is basically a wrapper around a value of type int. There are some constraints for the value/object:
Not every value in int's range is valid1
The valid values are not a ...
0
votes
1answer
188 views
Responsibility-driven design
I am quite confused about the responsibility-driven design concept. Mainly because of ever so slightly changing definitions depending on the source.
Quoting BlueJ (the book I am learning that teaches ...
-2
votes
4answers
347 views
Is judicious & plausible selection of class fields a valid refactoring step?
I'm a great fan of refactoring but I've been wondering about the issues raised by refactoring.
Fowler advises refactoring
to make code readable to all users
to make the code structure more sensible, ...
29
votes
9answers
9k views
In OOP, isn't the 'protected' keyword required?
Some modern languages (e.g. Swift, Dart) do not support the protected access modifier keyword. Swift is a protocol-oriented language, but I've heard that Dart is a completely object-oriented language.
...
-2
votes
2answers
119 views
C# Static & Constructor Logic [closed]
I learn C# and try to understand the logic between static and Constructor right now. One thing I need ask you about an example which I will give at below. (please ignore the quality of code or how ...
-2
votes
1answer
492 views
UML class diagrams - how do I draw a class diagram that shows a self-reference? [closed]
So I have the following case. I have an interface A and an implementation AImpl. Now I have another implementation of A, called A2Impl, which references any instance of A besides implementing A ...
0
votes
1answer
943 views
Class structure: How should a binary tree and it's node class be implemented in Java in terms of class files?
In implementing a binary tree in Java, should the node class be a separate class file independent of the BinaryTreeclass, or should it be a default class in the same class file as the BinaryTree class?...
1
vote
4answers
151 views
Should supporting algorithms be in their own class?
My Widget class has a method called loadWidget. This method needs to shuffle an array to work properly, among other things. In Widget, I could implement a Fisher-Yates shuffle as its own static method ...
0
votes
2answers
312 views
2 way multiplicity constraints in code
my goal is to convert this class diagram into Java code.
How should I approach this, given that I want the constraints to hold at all times? It creates a chicken-egg problem where the first Course or ...
2
votes
2answers
199 views
How to organize my test functions? (Part II: Keepin' it classy)
What are the best practices to organize your unit tests in classes?
I see different possibilities:
1) One would be to write one "container" class for each function you want test and then ...
0
votes
2answers
104 views
Where should the logic concerning a class's behavior reside? In the class itself or in the calling subroutine?
I have a car object. The car cannot be driven unless it is turned on. When should I check to see if the car is on before I try to drive it?
In the main program?
class Program
{
static void Main(...
1
vote
2answers
419 views
Why are classes named “class”? [closed]
Could it also have made sense to call it a "Form", as in the Platonic sense of the ideal form that represents the thing which earthly objects strive to emulate?
0
votes
2answers
205 views
Which option is good in terms of software design?
I have one request interface IRequest and two classes ClientAddress and ClientOrder are implementing it. The same design is followed for Response with inteface IResponse and classes ...
-3
votes
3answers
315 views
Java - OO - Understanding Subclass of Class Object
While a fundamental concept, I don't understand the statement "every CLASS in Java is a subclass of the class object," which is often quoted in JAVA tutorials usually in the inheritance section.
I ...
1
vote
1answer
505 views
How many test-cases need to be created at least (valid and invalid equivalence class)?
Assume there is any program that is supposed to be tested and you like to perform an equivalence class analysis on it. Let's say you identified six valid and four invalid equivalence classes. Then, ...
0
votes
2answers
623 views
What are the advantages of proxy classes?
I've been learning about proxy classes in c++. I really don't see the advantages of using proxy classes, as they're not any better at concealing information than private members are. What advantages ...
-4
votes
1answer
303 views
Inheritance of Constructors from parent into child class [closed]
Is the Default Constructor of Super or Parent class Can be Inherited into Child class ?
4
votes
3answers
1k views
Factory pattern or builder pattern ? which one is suited for reading Finite Element Model data from a text file?
A follow up to another question (Making a design decision about reading model data from an input file).
I wish to ask another question regarding builder or factory pattern. (I read that builder is ...
2
votes
1answer
126 views
Making a design decision about reading model data from an input file
I am writing a finite element software in C++ and Qt. I want to load the input data to the model. I have a Model class that holds the data and does the work. I have created a simple lexer and parser ...
0
votes
3answers
4k views
Multiple classes working on an object
This might be a bit of a wide question but I want to understand if it's the correct way to do it.
Assume I have a couple of classes all doing operations on an object. First class takes the object, ...
-2
votes
1answer
25 views
Data Sharing Levels of Privacy
I've been looking through class and friends and similar c++ arrangements to share data, and cannot find how to program levels of share.
No players can know what the other players have in their gold-...
0
votes
3answers
239 views
Java, pattern to restrict field usage in subclasses to after calling specific method
I want to extend class Base which is defined in specific API and the extend the extended again. As you can see below, draw method of intermediate class calculates variable top and I need to use it in ...
0
votes
2answers
124 views
Using new [className] without a return
I have started using the following in my automation code in instances where I'm not interested in keeping the object 'alive'and just using it as a means as a type of precondition. For example:
...
6
votes
2answers
3k views
What's the best way to handle a large multi-file class in Javascript?
I have a very large class of 59 methods and about 3000 lines of code. I know that's far larger than most people would want, but the class represents a virtual machine, and most of the methods are run ...
5
votes
4answers
622 views
Proper way to name a class which has just methods and not fields
GOAL: naming a class which has the responsibility to save data in Android database.
The class structure is like this
ClassName {
public void saveSync(...){
/* implementation*/
}
public ...
1
vote
1answer
99 views
An interface for designing Arduino code
Often I want Arduino board to control several peripherals. Writing program for all of them in one document using #define SOME_PIN 4 constructions seems pretty inconvenient to me. Especially in such a ...
1
vote
3answers
387 views
When to use Parameters and When Not to C#
I am have an application using MVVM pattern. It takes a user ID and returns a table with the user's bookmarks. I am trying to decided if it is better practice to include parameters in my model's ...
