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1
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1answer
64 views

How to store/deal with data available to other classes

I'm writing a CAD program. Let's say I have in input class, this class reads various data from a text file and creates lots of lists/dictionaries and .... These data need to be accessed by other ...
-4
votes
0answers
32 views

can someone explain me what does a <enum class>.values() functions actually do? [on hold]

I used a values() method in an enhanced for loop to traverse all values in my enum class. But what does this method actually do?
0
votes
2answers
187 views

Is using multiple static classes with maximum one public method is a good idea

I'm writing a structural detailing (CAD) software for concrete buildings in C#. I have defined like hundreds of static classes each with one public method and if needed some private methods. Each one ...
1
vote
2answers
55 views

Confusion about associations in UML class diagram

--------------------- ---------------------- | FLIGHT | | STEWARD | --------------------- ---------------------- | Arrival time | | Steward ID | | ...
-5
votes
0answers
106 views

Why should I ever implement structs? [duplicate]

Structs are value types so they're more expensive to handle. Classes are more capable that Structs. What are the reasons to ever choose to use a Struct in C#?
4
votes
2answers
139 views

In Python, is there any difference (apart from a few listed exceptions) between classes and dictionaries?

My logic goes like this: def A(val): return {'a':val} print(A(7)['a']) is the same as class A: def __init__(self, val): self.a = val print(A(7).a) Obviously, there are problems ...
1
vote
2answers
145 views

Will there be a memory or processing time difference between a class member function and a global function

I'm writing a neuron network simulation program and every operation or additional byte per neuron scales insanely. I prefer C++ as a language over the others, but now I'm wondering if the class ...
0
votes
1answer
57 views

Storing Form Data in a class

I have a form that writes to a database. Other than creating a class handle an external API, this project is done. However, the processing script is your standard procedural calling of queries using ...
1
vote
2answers
283 views

What is the purpose of creating a member function with the same type as its class?

I'm sure I'll botch some of the specific terminology, but what is the difference between object and object2 in this implementation? Is the only purpose of the first method (prototyping the class's ...
1
vote
2answers
219 views

Decide the type of an object during runtime

I try to implement a PriorityQueue with C#: public class PriorityQueue<T> : Heap<T> where T : IComparable<T> { ... } The Heap is abstract. I have MinHeap and MaxHeap that are ...
3
votes
6answers
602 views

Unit test private method in c++ using a friend class

I know that this is a debated practice, but let's suppose that this is the best option for me. I am wondering about what is the actual technique to do this. The approach that I see is this: 1) Make a ...
1
vote
2answers
256 views

When should I refactor a private class into a package-private class?

When I began implementing a class in my system (let's call it A), I realized I needed some kind of object that does something. So I needed a new class (let's call it B), but I made it a private static ...
0
votes
0answers
56 views

Is it good to make singleton Log classes for Entity classes [duplicate]

I am little confused about the technique i use in almost all applications i wrote ,i think i am going wrong I make Entity class Forexample Person, Adress ,Class and then to save it i make AdressLog ...
0
votes
0answers
43 views

c++ coding practice class vs. “free” functions [duplicate]

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 ...
-3
votes
2answers
144 views

Why friend in C++ should be in the header file? [closed]

Friend function/class, FriendOfX for some arbitrary class X is an implementation detail of class X. Why in C++ we have to declare them in the header file? Are there any compelling reasons to make this ...
2
votes
1answer
86 views

class hierarchy with structurally different subclasses

I want to implement a protocol layer which sits on top of the TCP/IP stack. There is a limited set of PDUs that can be sent and for each PDU there is a class which represents it in a structured form. ...
1
vote
2answers
91 views

How specific should be an interface about its implementation details?

Perhaps I should have picked a better title, but anyway... Basically what to do with two or more implementations that have the same public interface, but they are meant for slightly different ...
1
vote
2answers
527 views

A vector of pointers to different derived classes of the same base class

I am writing a game in C++ which has different enemy types. I have defined a base Enemy class and I also have derived classes enemy1, enemy2 etc. Now for updating these enemies in each iteration of ...
0
votes
2answers
215 views

Working with Javascript classes the right way

Comparable questions have surely been asked before but I'd like to hear some words about my specific way of implementing Javascript classes. Let me first start with a Javascript example taken from a ...
1
vote
1answer
89 views

Using class like an object in Python

I am learning from Learn Python the hard way where I have come across a study drill where they want to know that whether a class can be used like an object. As I have experimented: class A(object): ...
3
votes
7answers
694 views

Significant amount of the time, I can't think of a reason to have an object instead of a static class. Do objects have more benefits than I think? [closed]

I understand the concept of an object, and as a Java programmer I feel the OO paradigm comes rather naturally to me in practice. However recently I found myself thinking: Wait a second, what are ...
0
votes
2answers
506 views

Question about casting a class in Java with generics

In Java 6 Class<? extends ArrayList<?>> a = ArrayList.class; gives and error, but Class<? extends ArrayList<?>> b = (Class<? extends ...
2
votes
0answers
101 views

How to build child classes as parent configuration?

I'm using Codeigniter PHP Framework for developing a web application, and when developing an admin zone, I've ended building a generic parent class called AdminController which is extended by the ...
2
votes
2answers
259 views

MVC: “User” model gets big and crowded. Should methods that do CRUD operations on one-to-many relationship data be in different models?

In most MVC web projects there is a User class. Many times a user has something else in a one-to-many relationship, i.e. orders. If we have a user class that has many orders, should methods that add, ...
2
votes
1answer
203 views

UML class diagrams: How to show dependency

Please consider a program with four classes: Class A, B, C and D. Classes A and B are subclasses of abstract super-class C. Class D is dependent on C. Meaning: It holds a C objectOfTypeC field. As ...
26
votes
8answers
5k views

Why have private static methods?

I just wanted to clear up a question I have. What is the point of having a private static method as opposed to a normal method with private visibility? I would have thought an advantage to having a ...
2
votes
2answers
78 views

How to invoke a method in a class always when the class is accessed - like a reaction? [duplicate]

I am working on a C# net micro framework project, in particular an I2C bus class. I have several different I2C devices each defined in separate classes which contain all of the devices' unique ...
1
vote
2answers
4k views

Suggest a best practice to create Constants class

There is a debate in between my team members about declaration of Constants class. We are moving the constant variables into separate class as like below public class Contants { public const ...
2
votes
2answers
226 views

Should I always start with UML as a good practice when designing classes?

I am in the middle of creating a Bundle for PHP application based on Symfony 2. I want the bundle to be clear and good designed, so I constantly move and refactor code, rename methods, reorder ...
1
vote
5answers
180 views

Clarification about Polymorphism / Inheritance

I am trying to better my understanding of polymorphism. Say I have a base class called baseClass with one method called foo() and I have three derived classes called derived1 , derived2 and derived3 ...
1
vote
1answer
144 views

Dynamic method creation in python

I have a class that will have a number of external methods that will all call the same smaller set of internal methods. So something like: obj.method_one(a, c) and obj.method_two(a, c) where ...
0
votes
0answers
296 views

Changing method signature for implementing classes in PHP

Is there any decent work around to PHP's lack of Generics that allow static code inspection to detect type consistency? I have an abstract class, that I want to sub-class and also enforce that one of ...
0
votes
1answer
206 views

In objective C, where does the inheritance chain end? [closed]

In objective C, classes are objects, but what object owns the class objects? I am trying to get as detailed an understanding of iOS programming as I can, and this question popped into my head, so I ...
1
vote
2answers
260 views

Preventing some downsides of a static class

Here is my situation. I have implemented the accepted .NET 4.0 answer in this question, which is working. However, my codebase is quite large and as responsible for this code I've started getting ...
1
vote
1answer
505 views

Is it good or bad practice to provide separate classes for an object: one to build it, and one to use it?

Suppose I'm writing some C++ code to visualize "Foo" objects. I have two ways of getting a "Foo": computing it from data, or from taking the pieces of a precomputed "Foo" and building a new "Foo". ...
0
votes
2answers
425 views

In PHP, should I delete objects immediately after use?

I've read in PHP Advanced and Object Oriented Programming by Larry Ullman that it is good programming practice to delete object immediately after use but reason is given nowhere. I am a student web ...
2
votes
2answers
961 views

Concrete types - as described by Stroustrup - C++ Programming Language 4th ed

I'm having a hard time with this concept. What is Stroustrup getting at here? What is special about a class whose "representation is part of its definition"? What does a "concrete type" contrast ...
1
vote
3answers
276 views

Better style for member variables?

class awesomeClass { std::list<A> myList; //... void fillList(); }; awesomeClass::awesomeClass() { fillList(); } void awesomeClass::fillList(){ //... foreach(A a, ...
13
votes
6answers
2k views

Should a class know about its subclasses?

Should a class know about its subclasses? Should a class do something that is specific for a given subclass for instance? My instincts tells me that is a bad design, it seems like an anti-pattern of ...
0
votes
1answer
343 views

Basic OOP theory: misunderstanding surrounding database and user classes

New to OOP and trying to understand some basic fundamentals. Currently using PHP5 to build a basic web app. In using PHP's built in PDO as my database class and a separately created user class that ...
1
vote
1answer
321 views

UML class diagram - can aggregated object be part of two aggregated classes?

Some sources say that aggregation means that the class owns the object and shares reference. Lets assume an example where a company class holds a list of cars but departments of that company has list ...
4
votes
1answer
5k views

Why use classes when programming a tkinter gui in python

I program primarily in python and have programmed a couple of GUI's with Tkinter, every tutorial I have ever seen has recommended defining and using a class for the GUI, but my GUI runs flawlessly ...
0
votes
3answers
216 views

Class or Dictionary

I want to create a immutable Scale class in C#. public sealed class Scale { string _Name; string _Description; SomeOrderedCollection _ScaleValueDefinitions; Unit _Unit // ...
2
votes
4answers
1k views

Returning multiple values in Javascript

Often I am writing a function that returns multiple values, such as a pair of coordinates: function get_coords() { return ???; } If I was using a language like Python, I would use a tuple: ...
3
votes
2answers
2k views

When to use private methods in Python

I have a class, but every method in it should be private (apart form __init__ and __str__). Should I denote every method with a double underscore, or is that deemed bad practice?
4
votes
2answers
527 views

Should I put utility methods inside a class?

I have been working on a library which contains a large set of functions. For the sake of simplicity, I am going to use just one set as an example. I am not sure which is the better way, in terms of ...
2
votes
3answers
1k views

Specific reasons to create own array class over using std::array?

What specific conditions or requirements should you create your own array over using std::array? Here is my background: I'm developing a small simple library that a small group of people will use ...
1
vote
1answer
162 views

Class Design for special business rules

I'm developing an application that allows people to place custom manufacturing orders. However, while most require similar paperwork, some of them have custom paperwork that only they require. My ...
0
votes
1answer
359 views

Reading a specific type of input from file

I have a software that reads from a file. Each object in the software takes 7 inputs viz. string string string float string float int I have an input file. It contains a number of input values. If ...
0
votes
2answers
156 views

Is it valid to initialize an instance of a class within the same class?

I was wondering if it's valid to initialize an instance of a class within the same class? For example: public class Person() { string name; string age; public Person getPerson() { ...