Stack Overflow
Stack Overflow

Questions tagged [initializer]

Initializers are called to create a new instance of a particular type. In its simplest form, an initializer is like an instance method with no parameters

684 questions
15
votes
5 answers

Declare a List and populate with values using one code statement

I have following code var list = new List(); list.Add(new MyCustomTypeOne()); list.Add(new MyCustomTypeTwo()); list.Add(new MyCustomTypeThree()); this of course works, but I'm wondering: how can I declare the list and populate it…
user1765862
  • 13,635
  • 28
  • 115
  • 220
15
votes
4 answers

Java double brace initialization works always?

I know that this code: Set set = new HashSet() {{ add("test1"); add("test2"); }}; is really: Set set = new HashSet() { {//initializer add("test1"); add("test2"); } }; The initializer block is being…
user926958
  • 9,355
  • 7
  • 28
  • 33
14
votes
1 answer

Taking address of temporary (compound literal) parameter in C

I can't imagine this isn't already duplicate, but I can't easily find the answer since the more complex scenarios specifically to C++ seem to dominate the discussion0. Is it legal to take take the address of a temporary constructed in the parameter…
BeeOnRope
  • 60,350
  • 16
  • 207
  • 386
14
votes
4 answers

Creating an array of two-dimensional arrays in C#

I simply want to create an array of two dimensional arrays to store coordinate points. So I want an array where each index returns a two dimensional array which I would use as x and y. Here's what I've tried: waypoints = new int[4][,] { …
MysticPing
  • 183
  • 2
  • 2
  • 7
14
votes
4 answers

How to create initializer to create and migrate mysql database?

I have been learning how to use EF for a week or so now and am stuck on the issue of creating/updating my database. I am able to create an initializer to create the database if it is not there: static class Program { static void Main() { …
Matt
  • 1,328
  • 1
  • 16
  • 28
13
votes
3 answers

Rails 3.1 Deployment to Heroku Error

I'm trying to deploy my app to Heroku, I've done this before on my Windows machine, and now I am currently using a mac. I'm trying to use Postgresql for the first time. I have the following in my Gemfile: gem 'pg' EDIT: AndrewDavis-OSX:lunchbox…
ardavis
  • 9,842
  • 12
  • 58
  • 112
13
votes
1 answer

auto with parentheses and initialiser list

Coming up from another question: Since C++17, auto x0{1, 2, 3, 4};, previously deducing an initialiser list, is not allowed any more (sure, we can use auto x0 = {1, 2, 3, 4}; instead...). Now as always avoiding uniform initialisation (e. g.…
Aconcagua
  • 24,880
  • 4
  • 34
  • 59
13
votes
2 answers

Swift: "failable initializer 'init()' cannot override a non-failable initializer" vs. default parameters

If I declare public class A: NSObject { public class X { } public init?(x: X? = nil) { } } all is fine. When using it like let a = A(), the initializer is called as expected. Now, I'd like to have the nested class X private, and the…
Stefan
  • 1,036
  • 10
  • 32
13
votes
2 answers

Designated Initializer of UITextView

When I create a new subclass of UITextView in the Xcode 6 Beta, the following code is automatically provided. import UIKit class TerminalView: UITextView { init(frame: CGRect) { super.init(frame: frame) // Initialization code …
Brian Tracy
  • 6,801
  • 2
  • 33
  • 48
13
votes
3 answers

Static Initializers vs Instance Initializers vs Constructors

I am studying for an exam about Java. While I was studying, I have encountered syntaxes in java which are unfamiliar to me. Such as a curly braces({}) unside a class body without a name, some has a static keyword. I have found out that they are…
steven0529
  • 1,513
  • 1
  • 18
  • 28
13
votes
2 answers

Calling a class method upon creation of Python classes

I'd like to automatically run some code upon class creation that can call other class methods. I have not found a way of doing so from within the class declaration itself and end up creating a @classmethod called __clsinit__ and call it from the…
Simon
  • 133
  • 1
  • 5
12
votes
3 answers

Does Rails initializers gets called when I run rails console

I want to put my chargify conf inside the initializer, but I found the initializer won't execute in my rails c, is there a way to invoke my initializers so I can test in my console? Chargify.configure do |c| c.api_key = "keykey" …
user1883793
  • 4,011
  • 11
  • 36
  • 65
12
votes
2 answers

What causes this initializer inheritance issue with UIBarButtonItem?

I'm trying to create a simple Swift subclass of UIBarButtonItem: class LabelBarButtonItem: UIBarButtonItem { let label: UILabel init(text: String) { self.label = UILabel(frame: CGRectZero) self.label.tintColor = UIColor.grayColor() …
Bill
  • 44,502
  • 24
  • 122
  • 213
12
votes
3 answers

Rails initializers are running while migrating database

It is very surprising that Rails's initializers run while running any rake task, including db:migrate and db:seed. An initializer in my app starts a background thread (a kind of worker process), and it should be executed only when the application is…
Paul
  • 25,812
  • 38
  • 124
  • 247
12
votes
3 answers

C# dictionary initializer compilation inconsistency

The following code compiles, but fails with a NullReferenceException: class Test { public Dictionary Dictionary { get; set; } } static void Main(string[] args) { var x = new Test { Dictionary = // fails …
Ben M
  • 22,262
  • 3
  • 67
  • 71
1 2 3
…
45 46