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How are virtual functions and vtable implemented?
...dress of the virtual table in memory. Whenever there is a virtual function call, the v-table is used to resolve to the function address. An object of the class that contains one or more virtual functions contains a virtual pointer called the vptr at the very beginning of the object in the memory. He...
How to get a DOM Element from a JQuery Selector
...rowsers too. Some attributes can be different. The classic example is AJAX calls. To do this properly in raw Javascript has about 7 fallback cases for XmlHttpRequest.
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Sending POST data in Android
...Suthar, @Tamis Bolvari and @sudhiskr for the comments. *
public class CallAPI extends AsyncTask<String, String, String> {
public CallAPI(){
//set context variables if required
}
@Override
protected void onPreExecute() {
super.onPre...
What's the difference between MyISAM and InnoDB? [duplicate]
... @Anthony: In RDBMS, a "transaction" is a unit of work. Basically, a set of DML statements (one ore more) that is initiated with "START TRANSACTION" statement, and is either completed with a "COMMIT" statement, or undone with a "ROLLBACK" statement. As far as a consistency of resultse...
What is the difference between HTTP and REST?
...E is for DELETE).
that's unlike the older concept of RPC (Remote Procedure Call), in which you have a set of actions you want to perform as a result of the user's call. if you think for example on how to describe a facebook like on a post, with RPC you might create services called AddLikeToPost and ...
IBOutlet and IBAction
...IB.
For example, suppose you define a button and label in IB. To dynamically change the value of the label by pushing the button, you will define an action and property in your app similar to:
UILabel IBOutlet *myLabel;
- (IBAction)pushme:(id)sender;
Then in IB you would connect myLabel with ...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
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As from PostgreSQL 9.0 you can use the aggregate function called string_agg. Your new SQL should look something like this: SELECT company_id, string_agg(employee, ', ')
FROM mytable
GROUP BY company_id;
shar...
What is the difference between the OAuth Authorization Code and Implicit workflows? When to use each
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The access_token is what you need to call a protected resource (an API). In the Authorization Code flow there are 2 steps to get it:
User must authenticate and returns a code to the API consumer (called the "Client").
The "client" of the API (usually your web ...
Static variables in JavaScript
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If you come from a class-based, statically typed object-oriented language (like Java, C++ or C#) I assume that you are trying to create a variable or method associated to a "type" but not to an instance.
An example using a "classical" approach, with constructor...
Use-case of `oneway void` in Objective-C?
... threads or applications. It tells the system that it should not block the calling thread until the method returns. Without it, the caller will block, even though the method's return type is void. Obviously, it is never used with anything other than void, as doing so would mean the method returns so...