When do you use the “this” keyword? [closed]

When do you use the “this” keyword? [closed]

I was curious about how other people use the this keyword. I tend to use it in constructors, but I may also use it throughout the class in other methods. Some examples:In a constructor:public Light(Vector v){ this.dir = new Vector(v);}El

jQuery find events handlers registered with an object

jQuery find events handlers registered with an object

I need to find which event handlers are registered over an object.For example:$("#el").click(function() {...});$("#el").mouseover(function() {...});$("#el") has click and mouseover registered.Is there a function to find out that, and possib

Using a dispatch_once singleton model in Swift

Using a dispatch_once singleton model in Swift

I'm trying to work out an appropriate singleton model for usage in Swift. So far, I've been able to get a non-thread safe model working as:class var sharedInstance:TPScopeManager { get { struct Static { static var insta

'admin' is not a registered namespace in Django 1.4

'admin' is not a registered namespace in Django 1.4

I'm attempting to upgrade quite a large Django project to the newly released Django 1.4, and I'm having some issues when running python manage.py test.Lots of the internal tests which passed in Django 1.3 are now failing, with really odd me

Exhaustive condition of switch case in Swift

Exhaustive condition of switch case in Swift

The Apple documentation says Every switch statement must be exhaustive. That is, every possible value of the type being considered must be matched by one of the switch cases.So in new Xcode I have placed a code like thisprintln(UInt16.mi

PMD: Avoid instantiating new objects inside loops

PMD: Avoid instantiating new objects inside loops

I've got an issue with the PMD rule Avoid instantiating new objects inside loops. Here is some example code:import java.awt.Dimension;public class PMDDemo { public static void main(final String[] args) { final Dimension[] arr = ne

OpenCV : How to Load png images with 4 channels?

OpenCV : How to Load png images with 4 channels?

I have been trying to load .png files with transparency channel (RGB and Alph) with no luck. It appears that openCV strips the 4th channel out of the image. Is there any method to load the image with the complete 4 channels including the al

Change the root context to other folder in tomcat 6

Change the root context to other folder in tomcat 6

I want to change the context of my deployed web application. Currently it is accessed by the url www.app.mysite.com/dashboard But i want to change it to www.app.mysite.com/application/dashboard I went through post to change the root context

How to implement real time updates in ASP.NET

How to implement real time updates in ASP.NET

I have seen several websites that show you a real time update of what's going on in the database. An example could beA stock ticker website that shows stock prices in real timeShowing data like "What other users are searching for currently.

Type definition with a trait: Differences of specifying an explicit lifetime bound?

Type definition with a trait: Differences of specifying an explicit lifetime bound?

I'm having issues understanding the lifetime bound requirements when I use a trait in a type definition. For instance:trait Kind { /* ... */ }type CollectionOfKind = Vec;// => error: explicit lifetime bound requiredThe requirement for lifet

cron git push with ssh key

cron git push with ssh key

I setup a ssh key for github account, so I don't have to enter the password every time, it works fine. Here is the script I use:#!/bin/bashgit push origin masterBut when I use cron to run it, it will not use my ssh key. Here is the output:P

How to remove duplicates from multidimensional array? [closed]

How to remove duplicates from multidimensional array? [closed]

I have a multidimensional array:[[7,3], [7,3], [3,8], [7,3], [7,3], [1,2]]Is there any smart way to remove duplicated elements from this?It should return such array:[[7,3], [3,8], [1,2]]Thanks! 1:arr = [[7,3], [7,3], [3,8], [7,3], [7,3],

Azure EF Code First Migration Initializer

Azure EF Code First Migration Initializer

I am just messing with Azure, and I can't seem to get my Db to work. I am following what it says here: https://www.windowsazure.com/en-us/develop/net/tutorials/web-site-with-sql-database/ and I updated my web.config to have this:

Getting pixel color in C++

Getting pixel color in C++

I would like to get the RGB values of a pixel at different x, y coordinates on the screen.How would I go about this in C++? I'm trying to create my own gaussian blur effect. This would be in Windows 7.EditWhat libraries need to be included

PHP Inherited parent method can't access child's private property

PHP Inherited parent method can't access child's private property

First of all: A quite similar problem has been posted and somehow solved already, but is still not answering my specific problem. More about this later.In words: I have a base class which provides some methods to all childs, but doesn't con

UITextInputDelegate methods not functioning correctly

UITextInputDelegate methods not functioning correctly

I'm working on iOS 8 custom keyboard extension right now, and there are some issues in using UITextInputDelegate Methods.Does this right: selectionWillChange: and selectionDidChange: methods should be called when user long-presses typing ar

Impose build order for a multi-project in Maven

Impose build order for a multi-project in Maven

I have a multi project in maven like this:paren-project -> plugin-project -> testbed-projectThe plugin project generates a JAR, which is manually copied to a specific subdirectory of testbed (using whatever embedded script like groovy or

Non CRUD actions with ember-data

Non CRUD actions with ember-data

Say I have the following ember-data model:App.Person = DS.Model.extend({ firstName: DS.attr('string'), lastName: DS.attr('string'), starred: DS.attr('boolean')});This communicates with a Rails app with the following pretty stand

Selenium ChromeDriver switch tabs

Selenium ChromeDriver switch tabs

When I click on a link in my test, it opens a new tab. I want ChromeDriver to then focus on that tab. I have tried the following code to get ChromeDriver to change tabas using the ctrl+tab shortcut:Actions builder = new Actions(driver);buil

What does the slice() function do in Python?

What does the slice() function do in Python?

First of all, I'd like to clarify the question: it's about the slice() function, not slices of lists or strings like a[5:4:3].The docs mention that this function is used in NumPy and give no examples of usage (it's said how to use it but it

how can you tell when an Android activity is finished loading?

how can you tell when an Android activity is finished loading?

I'm in the process of working on an automated test suite for our android app, and running into trouble waiting for activities to fully load. I can call getActivity, but just because it shows the activity that I'm hoping to see in my test d

Including documents in the emit compared to include_docs = true in CouchDB

Including documents in the emit compared to include_docs = true in CouchDB

I ran across a mention somewhere that doing an emit(key, doc) will increase the amount of time an index takes to build (or something to that effect).Is there any merit to it, and is there any reason not to just always do emit(key, null) and

jQuery focus not working

jQuery focus not working

I am trying to focus on credit card validation fail. but strange focus() not working. $('#cc_number').validateCreditCard(function (result) { if (result.length_valid && result.luhn_valid) { } else { $("#cc_number").focus();

How to get the id of the latest uploaded video in a youtube channel

How to get the id of the latest uploaded video in a youtube channel

In youtubeHow do i get the id of the latest uploaded video (the one that comes in the url like v=....) of a channel to which Im subscribed, for embededim using php in my server side 1:Here's a example using the YouTube RSS feeds, simplex

VOIP app is not wake up in time if set 15 min for setKeepAliveTimeout method

VOIP app is not wake up in time if set 15 min for setKeepAliveTimeout method

I've developed app which should process some data every 15 min. So I added voip flag into plist file. And use setKeepAliveTimeout with 900 sec(15 min). Also added background task functionality which processes some data.Processing of data ta