Questions tagged [constructor]

A special type of subroutine called at the creation of an object.

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1answer
63 views

If constructor has actions besides assignment should I move those actions in separate method?

I have class CellGroup that contains List of cell lists That class has creation of list inside and transforming it to list of lists. ...
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2answers
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Made a monster array for a text based game with a class constructor C++ [closed]

I created a class in a separate .h and .cpp file with the idea of having an array of 3 monsters with each monster having different stats( name; health; damage). The problem is that the constructor ...
4
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1answer
73 views

Commands Object creation using chained Builder pattern

Context As many of you may know I have a library that allows C++ objects to be converted into JSON/YAML/BSON automatically with a single declaration (see previous code reviews). I am now (trying) ...
2
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1answer
36 views

Modify parameter data before creating an instance of a class in PHP

I have an abstract Badge class, every class extending this class should always correctly set the incoming name (string) and achievedAt (date) fields. There might be other classes that extend the Badge ...
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2answers
67 views

Set id in constructor, or generate it when asked for?

I'm using PHP, I have a class that generates an id based on the calling class, so the id of the class won't change after it has been initialised, now I'm wondering which of my two methods is ...
4
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1answer
333 views

C++ wrapper class for array of OpenGL buffer objects — just the constructors

A similar question was asked here, and I'm trying to do the same thing. But I'm trying a different approach by deriving from std::array, and This is a very focused ...
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1answer
115 views

Is performing IO in constructor good idea? [closed]

I have Java (or C#, Python, Kotlin, or other similar language) class that will be used to communicate with client over network. Protocol used by this application allows many different ways to create ...
4
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1answer
119 views

Randomizing all class variables in constructor c++

I'm playing around with making random items and decided to implement the following structure. ...
1
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1answer
46 views

Passing argument to a constructor and using it only in some class methods

I've created some controller for handling clicked links statistics. Does this class meet Single Responsibility Principle? ...
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2answers
272 views

Array indexing with copy constructor, assignment operator and index operator overload

The code below is a custom array class that handles indexing, copying, printing, etc. explicitly. Is there a better approach for specification (declaration and definition) of the assignment operator (...
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2answers
118 views

Particle Swarm Optimization algorithm

This is part of a Particle Swarm Optimization algorithm, a snippet of a Particle class implementation. ...
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3answers
98 views

Minecraft city class [closed]

This is a class representing a city in a mod I am creating for Minecraft. All the constructor parameters are mandatory and they are used to help the class that calculates and builds the Paths, ...
2
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0answers
92 views

Convenient way to make an UIImageView ExpressibleByStringLiteral

I want to reduce boiler-plate code and write like this when developing in iOS: let imgView: UIImageView = "share_fareware_text_bg" Here is implementation code: <...
1
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1answer
153 views

Constructor function for persons with hobbies

I'm trying to write a constructor function that generates instances of a user. One of the properties of the user class is an array of the user's hobbies. I'd like ...
1
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1answer
31 views

Adding Length dimension to a Crate Object

Consider Crate::addLength() in the following code: ...
4
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1answer
41 views

Time interval class that enhances constructor argument handling of its parent class

I am making a subclass of a well-established python class: pendulum.Period, which overrides both __new__ and ...
4
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1answer
73 views

Super fancy list constructing in Python

Out of curiosity I was discovering the potential of the Ellipsis object in Python (...), and I discovered it doesn't do a whole ...
2
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1answer
47 views

Constructor for a packagetarget struct

As many of you know goto is usually signs of code smell. However I thought this could be an appropriate case, and would like confirmation or criticism. Unnecessary ...
4
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2answers
1k views

Implementing a c++ Kafka producer based on librdkafka

To practice my c++ I decided to implement a simple Kafka producer to wrap the producer in c in librdkafka library. I just want to get your opinion on the way I have implemented teh default, copy and ...
3
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2answers
120 views

Constructing a cumulative distribution function from a histogram

During some running process, a histogram of values shall be build up. When done, the CDF shall be derived from it and used to get the quantiles for some values. My current implementation looks as ...
0
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3answers
66 views

Represent a Class which holds translation Strings [closed]

I have a class which represents some translations of a keyword. ...
5
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2answers
302 views

C++ wrapper class to mimic a C array's brace initialization

I have an inheritance class that mimics the behavior of C style array's brace initialization by using a class template that has a variadic constructor but the template itself is not a variadic ...
3
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1answer
473 views

C++ - Astar search algorithm using user defined class

The objective of the post is to improve design and improve command on C++. Given a map, start point and end point, the shortest path to end point from the start point has to be found out using Astar (...
3
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1answer
253 views

Load and update XML inside the constructor

My requirement is, I need to load the existing xml file from the given path by passing through command line arguments and need to update the xml file from C# code. First time I am working on the C# ...
0
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2answers
654 views

Fetching data from your database in a constructor

I have this item (an item is an object linked to a xml view), to build it I need 2 things, get labels from codes, and get text from the strings.xml android file. please ignore the long to int and int ...
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2answers
1k views

Constructors with variable number of arguments [closed]

Assume that we have a class with multiple constructors which may look like the following: ...
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2answers
72 views

Healthy Characters

Let's say I have an abstract class Character that have fields health and maxHealth. maxHealth...
3
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1answer
91 views

Representing destinations in a square

I've written a program following the instructions of an exam paper. There are no solutions available so I would appreciate a feedback. I'm concerned with main in ...
4
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1answer
123 views

Designing the constructor interface for a reflection object (any class)

I am working on cleaning up and making open source a C++ reflection library that has served me well over the last few years. One of the most important classes of the library is ...
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4answers
148 views

Java Date class- switches and ifs in the constructor

I'm a beginner i have an assignment to write a Date class (as part of a bigger project). in my question i focus on the constructor. here's some background: the given guidelines are that the date is ...
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2answers
474 views

Class for course information

Here's what the question asks: Build a class called Course.java. This class should have 4 properties: CourseId, CourseName, Description, and credit hours. Also add the appropriate set and get ...
1
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1answer
4k views

Testing async method call from constructor

I have a project where I want to build a more sophisticated ToDo list - basically a personal project management system. I'm just starting out with the project, and I'd like some feedback on whether my ...
3
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1answer
891 views

Character class with name, gender, and inventory list

I am trying to create a class to test my understanding, and it takes an ArrayList as parameter. The decision of choosing an ...
3
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4answers
116 views

Simple addition calculator accepting addition expressions

Maybe someone can help me to optimize the calculate method. I think that it can be simplified from that what I have now. The objective is: grab a string via the ...
0
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2answers
131 views

Ensuring a non-zero radius when constructing a circle

Is there a little "better" way of writing the line: raise RuntimeError if not radius.is_a? Numeric or radius == 0 I want to only allow numbers bigger than 0. <...
2
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2answers
506 views

Elegant way to “construct” kind-of enum values in go

I'm quite new to Go and would like to improve my code. I have a representation for access levels in Go like this: ...
5
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2answers
291 views

Request dispatcher for PHP JSON web service

Below you can find the constructor method and related fields of the main class of my REST API (note that the class contains more code than displayed) written in PHP 7.1. It does various things with ...
0
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1answer
2k views

Initializing values of a singly linked list with a constructor [closed]

I have to create a constructor that allows a new linked list to be populated with ten consecutive values, starting at 0. Then I need to print the list! So i want to check if the functions I wrote for ...
0
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1answer
135 views

Controller with too many parameters with DI [closed]

Is there a way to reduce the number of parameters of this constructor? All the services must be used in this Controller. The majority of them are used more than 2 times(some of them >10), with the ...
3
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3answers
3k views

OOP modelling of a car agency

Exercise: A car dealer wants a computer system to manage the data of their vehicles and classify them by type. All cars have the following data Engine serial number Brand Year ...
2
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1answer
2k views

Factory using Structuremap to inject concrete implementation of BaseTask<T>

The problem statement that I am trying to solve is this; We will retrieve a list of Tasks from an external repository. These tasks will have a type and for each type, there needs to be a specific ...
5
votes
1answer
1k views

Simple c++ triple class to mimic pair for use with uniform initialization

I'm trying to create a simple triplet class, but the more I look at the implementation of std::pair the more I feel like I'm missing important details. What I have ...
5
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1answer
2k views

Counting the number of unique fractions read from a text file

I will begin this question with the disclaimer that it is homework but my code is written and working, I just want to know if there any ways in which I can improve what I already have. I want my ...
2
votes
3answers
115 views

Message class, with constructors for data from user and from database

I'm fairly new to Kotlin, and am looking to slim down a data class. It has two constructors, one for creation based on user input, and one for creation based on database data. ...
0
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2answers
62 views

Stateful User tracking

I have a class that takes a string or an integer, which stand for username or user id in the database. I am not comfortable with my constructor taking "a string or an integer" and want to modify it ...
2
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1answer
41 views

Validating inputs in the constructor [closed]

Let's take the following example. Even if the number of parameters is acceptable, I find that the code block is too long. Are these validations at the right place? Is there a better approach in such ...
13
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3answers
2k views

Immutable Object class in VBA – Creatable only through constructor and not via “New” keyword

Goals for the class Create Immutable objects – i.e. only Getters – no Setters Object creation only possible through a constructor, not via New keyword, to ensure ...
1
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1answer
46 views

SVG class with boilerplate prologue and epilogue from files

I noticed this old class of mine: ...
1
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1answer
27 views

Class for Stripe transactions

I just wonder whether it is a common approach to hit the third-party API and fetch values within the initialize method? Ex. ...
2
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0answers
649 views

OpenGL Shape class constructor

I'm coding a wrapper for OpenGL 3.3, and I have some questions about the design of my Shape class. To be short, It's a class that englobes a VBO, a VAO, and an EBO ...