Questions tagged [initialization]

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Is there any performance hit associated by the definition of a static constructor or due to availability of it?

This question is mostly related to the way language implementer do implements static class initalization (pretty specialized question). It is for curiosity and also to potentially improve my code to ...
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0 votes
0 answers
110 views

Ensure that library has been initialized

I am using a 3rd party library that must be initialized with Lib::init() before any of its other functions may be called and that must be uninitialized with Lib::destroy() before the application ends. ...
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2 votes
1 answer
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Modelling seats of a table in a social game

Assume we want to model a table where players can sit down to get together to play a game (card games, dice games, ...). Assume a few properties associated with each seat class Seat { public int ...
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2 answers
186 views

What is the proper way to unspecify an integer's value in C++? [closed]

// Default initialization int i; // i has an unspecified value return i; // Probably 0, but Unreliable i = 5; // i has a specified value i = int();// This will give it a specified value, 0 i = ...
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0 votes
1 answer
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Python - Type Hinting specific sized Vectors

Considering a class method that takes a "vector" (Tuple or List of either int or float) of defined values such as the following: import sys from numpy import isnan, array, float64 class Shape: """ ...
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  • 335
4 votes
2 answers
782 views

Verifying Parameters in Constructor or Service

I was reading on this SO page about when to check parameters when constructing an object. The accepted answer suggests throwing the exception from the constructor so that an invalid object cannot be ...
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1 vote
2 answers
3k views

Calling a static method from constructor's member initializer list

I'm implementing a simple rendering system for a game engine. In my engine I have renderable entities that have a Model component (I'm using inheritance as opposed to a ECS for my engine for now, but ...
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  • 181
1 vote
1 answer
193 views

Passing 0's (literals) to a constructor

I have a function that creates a new object by passing to it's constructor integer ids primarily with values of 0. This function is called when saving a newly created record (not an edit). public ...
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1 vote
1 answer
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Can you explain the behavior of PHP in cases when a parent class variable is masked by the child variable of the same name? [closed]

See the comment inside ChildEntity ::__construct(): class ChildEntity extends ParentEntity { /** @var int */ protected $classParameter; function __construct(int $classParameter) { ...
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2 votes
2 answers
155 views

What is the meaning of injecting a component in programming?

Components common to all ExoPlayer implementations are: A MediaSource that defines the media to be played, loads the media, and from which the loaded media can be read. A MediaSource is injected via ...
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3 votes
4 answers
274 views

Advice for bugfixing object oriented code: why is data not set?

When debugging object oriented (Java) code, sometimes some field of some object is null while it should not be. I often spend what I feel is way too much time trying to figure out where it should have ...
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11 votes
4 answers
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C# - Initialize DTOs in constructor or via properties?

Update: C# 9 should fix this problem using records :D I was wondering if there is a recommended approach to initializing the properties of a plain object that is used for data transfer, for example ...
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2 votes
3 answers
262 views

How to indicate that an application has been started before?

I'm building an application with a database where I'd like to populate the DB with some data at first start up (so that the user has a few examples of how the application can be used) To achieve this ...
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4 votes
1 answer
860 views

Assignment with brackets

On another SE site I saw code similar to this: int x[] = {1,2,3,4}; .... x[0] = {99}; For the assignment, is there an advantage to this over simply: x[0] = 99; http://ideone.com/xwA0Yh
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5 votes
2 answers
2k views

What can I infer from someones code when they use direct initialization with Curly Braces as opposed to Parenthese?

Up until now, I have been initializing most of my variables as such: const QString foo("bar"); Which from my newfound understanding, is known as direct initialization. (http://en.cppreference.com/w/...
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2 votes
2 answers
96 views

Creating an Instance of a Complicated Class

How do I create instances of classes which require a huge amount of components and attributes? Take for example a car. A car has hundreds of sub components each with their own specific properties. ...
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2 votes
2 answers
3k views

How to handle test with initialising functions that call mocked functions?

I am working on an embedded C project where there is a function used to initialise a module's (foo) context object handle. Thus when testing using the Ceedling I have used this initialising function ...
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3 answers
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Are commands for variable initialization ever used as expressions?

In C, the assignment command also returns the value assigned, so it is also an expression. Similarly, initialization, which happens when defining a variable, also assigns a value to the newly created ...
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2 votes
3 answers
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How do you create immutable objects with many parameters?

I need to create an immutable object but it requires several parameters to work like: class FooRepo { public string ConnectionStringName { get; } public string SchemaName { get; } public ...
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0 votes
3 answers
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A few questions about initializing variables

I'm in an introductory programming class and we're only in lesson two, so try to keep terminology simple, ha. I'm a bit confused about when you need to and when you don't need to initialize a ...
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3 votes
8 answers
6k views

Conditionally initializing a string list

I am writing a program that needs to be able to process data from a number of different sources. The sources output data in a variety of formats. So, depending on which source is being used, I need to ...
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3 votes
2 answers
378 views

How to handle a one-time startup SQL script

I'm trying to figure out the best way to tackle running a one-time SQL script when a service instance starts up. Here's the scenario: We run multiple Amazon instances of our service in parallel. Each ...
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1 vote
2 answers
472 views

Is it a good idea having default static variables for new instances?

OK let's say I have something like this: public class MyObject { public static int DefaultValue = 9 private int _value = DefaultValue; public int Value { get { return _value; } set { ...
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3 votes
2 answers
3k views

What does "initialize event handler" mean in this context?

In file1.js I read: // NOTE: initialize your app event handlers here, see file2.js for a simple event handler example // TODO: configure following to work with both touch and click events (mouse + ...
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  • 131
2 votes
1 answer
71 views

How to compute whether it is guaranteed the variable is set?

Assuming declarations are expressions consider such code: if ((var x = foo()) and (var y = x)) or (var z = bar()) then println(z); end The reference to x is OK, because at this point x has to be ...
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  • 1,466
4 votes
1 answer
3k views

Unique pointer initialisation

What is the correct initialisation of a smart pointer? std::unique_ptr<Class> ptr(std::make_unique<Class>()); or std::unique_ptr<Class> ptr = std::make_unique<Class>(); Is ...
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  • 584
3 votes
2 answers
296 views

For what reasons Java and C# initialize static data on demand?

I am reading "The Go Programming Language" right now and I have read package initialization chapter which tells (or I read it wrong) that Go uses eagerly initialization. So in time we saw say C++ ...
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  • 1,466
6 votes
2 answers
989 views

When to use Constructor and when to use Collection Initializer?

I am having a .Net class which has 10 properties like given below: [the datatypes of individual property is just a placeholder here and it can be anything from a primitive type to an object to a list ...
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8 votes
1 answer
639 views

Is a large static initializer a code smell?

I am extending SimpleExpandableListAdapter in Android. I don't think Android's adapter is implemented very well, in that its constructors have a large number of rather complicated arguments and it has ...
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19 votes
3 answers
52k views

Is it good to define a variable inside a loop? [closed]

My instructor once told me that I should not define a variable inside a loop, but I honestly still do not understand why. What are the disadvantages of that? Could any body explain that to me?
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23 votes
2 answers
9k views

Why does Swift not require semicolons? [closed]

I normally code in either c# or Objective-C and recently took it upon myself to learn Apple's new programming language - Swift. The first thing I noticed is that you don't need to add semicolons to ...
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36 votes
5 answers
25k views

Should I initialize C structs via parameter, or by return value? [closed]

The company I work at is initializing all of their data structures through an initialize function like so: //the structure typedef struct{ int a,b,c; } Foo; //the initialize function ...
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2 votes
1 answer
7k views

Should I initialize a member variable in declaration when it is initialized by a constructor parameter?

Which is recommended for initialization of class fields in C#: class Foo { public X x = new X(); // or any default value... public Foo(X _x) { x = _x; } } Or class Foo { ...
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3 votes
3 answers
1k views

In C++, how to call an 'init' routine as a class is loaded?

I have a program that loads a bunch of "addons" (different meters that measure and display system values). The "addons" have "grown" over time and the code of what addons to "activate", and how many ...
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  • 187
2 votes
2 answers
13k views

Initialize in Field, Constructor, or Argument

If I know what a field will be initialized to, should I initialize it in the field, constructor, or receive it as a parameter? I am asking about best practices. All three options effectively provide ...
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0 votes
1 answer
2k views

issues about Spring initialization in different environment

I have some questions about spring's initialization in different environment. 1. In web container context, such as tomcat. I knew that spring can be initialized by declaring org.springframework....
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  • 202
1 vote
3 answers
14k views

Make Return Type an Interface - Problem with Initialization

I would like to make the return type of my method an interface rather than a class for similar reasons stated in c# List or IList, however I am having trouble figuring out how to initialize the ...
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15 votes
1 answer
2k views

Is it fine to make a default constructor unusable?

Specifically asking about the default constructor Given that the constructor initializes all the data for an object, if I create a class that can't be used without proper initialization, is it not ...
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10 votes
4 answers
2k views

Where should an object in CQRS+ES be fully initialized: in the constructor, or when applying the first event?

There appears to be widespread agreement in the OOP community that the class constructor should not leave an object partly or even fully uninitialized. What do I mean by "initialization"? Roughly ...
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10 votes
9 answers
31k views

How important is to initialize a variable

How important is it to initialize variables? Does proper initializing avoid memory leaks or have performance advantages?
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5 votes
4 answers
2k views

Separation of construction and initialization

I'm confused by this post by Mark Seeman. And his comment on IInitializable below: The problem with an Initialize method is the same as with Property Injection (A.K.A. Setter Injection): it ...
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3 votes
4 answers
2k views

Initializing derived classes in the same way

I have a class Base that has several children, say A, B, C. For testing purposes I'd like to mock those derived classes by deriving from them. So MockA derives from A, MockB derives from B and so on. ...
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  • 1,131
2 votes
1 answer
124 views

Data decoding initialization/Constructor error handling

I have a set of loadable data decoders for a specific type of data and a stream to read containing data. Now I want the program to select the correct decoder in a reliable way so I want to use a trial-...
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3 votes
1 answer
1k views

Why does this static field always get initialized over-eagerly?

I am looking at this excellent article from Jon Skeet. While executing the demo code, Jon Skeet says that we can expect three different kinds of behaviours. To quote that article: The runtime ...
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23 votes
4 answers
24k 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 method. ...
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123 votes
10 answers
88k views

What is the opposite of initialize (or init)? [closed]

The term will be used as a method name. The method is called when a part of the user interface is hidden (or removed), and it is used to reset values to default and dispose objects that will not be ...
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4 votes
5 answers
2k views

variable comparison without initialising

I am working with a project in VC++ which involves co-ordinate system having x,y,z axis. I am trying to check for if a variable(Point with x,y,z values) is assigned on the coordinate system or its a ...
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10 votes
2 answers
16k views

best practice for initializing class members in php

I have lots of code like this in my constructors:- function __construct($params) { $this->property = isset($params['property']) ? $params['property'] : default_val; } Is it better to do ...
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  • 203
11 votes
5 answers
1k views

Is web application startup time really that important?

Had a conversation with someone about adding some initialization code on application startup and he complained about that causing an increasing in the startup time. He couldn't really state a reason (...
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16 votes
6 answers
28k views

How to write constructors which might fail to properly instantiate an object

Sometimes you need to write a constructor which can fail. For instance, say I want to instantiate an object with a file path, something like obj = new Object("/home/user/foo_file") As long as the ...
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