Implementing GetHashCode [duplicate]

Implementing GetHashCode [duplicate]

Possible Duplicate: What is the best algorithm for an overridden System.Object.GetHashCode? What constitutes a good implementation of the GetHashCode method? I did some googling, and found some goodlines (MSDN) but it seems like the logic

sortedArrayUsingSelector what is it doing?

sortedArrayUsingSelector what is it doing?

I am still new to objective-c and am trying to figure out what this statement is doing exactly.[names allKeys] sortedArrayUsingSelector:@selector(compare:)];I know that allKeys is getting all the keys from my dictionary. I know that sortedA

How do I pass arbitrary data to a click event handler function from a Dart polymer web component

How do I pass arbitrary data to a click event handler function from a Dart polymer web component

In Dart's Web UI, it was possible to pass arbitrary data to function in response to events, for example, the following snippet passes the value 2 to the increment(int incBy) method in response to the button's on-click event: Cl

LOWER LIKE vs iLIKE

LOWER LIKE vs iLIKE

How does the performance of the following two query components compare?LOWER LIKE... LOWER(description) LIKE '%abcde%' ...iLIKE... description iLIKE '%abcde%' ... 1:According to my tests (ten of each query), LOWER LIKE is about 17% faste

Searchable Enum-like object with string and int conversion

Searchable Enum-like object with string and int conversion

IntroThe enum type in C++ is fairly basic; it basically just creates a bunch of compile-time values for labels (potentially with proper scoping with enum class).It's very attractive for grouping related compile-time constants together:enum

UIImagePickerController bug

UIImagePickerController bug

I think I found a bug in latest iOS 7 by running an app with Base SDK set to iOS 6.1 (possibly even lower versions too, haven't tested that out yet)I have this image in my photo library: http://i.imgur.com/7KUIGLt.jpgI present a UIImagePick

Access to the iOS' video decoder?

Access to the iOS' video decoder?

The iPad/iOS has video streaming support for e.g. H.264 using MPMoviePlayerController etc., but i receive H.264 data through a custom, proprietary, stream and need to decode it in a soft real-time scenario.Can the iPads/iOS' video decoder b

SQL: Alias Column Name for Use in CASE Statement

SQL: Alias Column Name for Use in CASE Statement

Is it possible to alias a column name and then use that in a CASE statement? For example,SELECT col1 as a, CASE WHEN a = 'test' THEN 'yes' END as value FROM table;I am trying to alias the column because actually my CASE statement would be g

Using RabbitMQ is there a way to look at the queue contents without a dequeue?

Using RabbitMQ is there a way to look at the queue contents without a dequeue?

As a way to learn RabbitMQ and python I'm working on a project that allows me to distribute h264 encodes between a number of computers. The basics are done, I have a daemon that runs on Linux or Mac that attaches to queue, accepts jobs and

Are there advantages to use the Python/C interface instead of Cython?

Are there advantages to use the Python/C interface instead of Cython?

I want to extend python and numpy by writing some modules in C or C++, using BLAS and LAPACK. I also want to be able to distribute the code as standalone C/C++ libraries. I would like this libraries to use both single and double precision f

SQLite - getting number of rows in a database

SQLite - getting number of rows in a database

I want to get a number of rows in my table using max(id). When it returns NULL - if there are no rows in the table - I want to return 0. And when there are rows I want to return max(id) + 1.My rows are being numbered from 0 and autoincrease

singleton pattern in java. lazy initialization

singleton pattern in java. lazy initialization

public static MySingleton getInstance() { if (_instance==null) { synchronized (MySingleton.class) { _instance = new MySingleton(); } } return _instance;} 1.is there a flaw with the above implementation of the getInstance method? 2.

Access emails using imap

Access emails using imap

I am using Apache on Ubuntu 14.02 and running php on the same.I have connected to a remote mssql server hence no need of mysql . I want to know how to connect to an email id registered with gmail in order to read the incoming emails . I hav

Script to use Google Image Search with local image as input

Script to use Google Image Search with local image as input

I'm looking for a batch or Powershell script to search for similar images on Google images using a local image as input.My research so farThe syntax for a image search using a URL rather than a local file is as followes:https://www.google.c

does Java type erasure erase my generic type?

does Java type erasure erase my generic type?

I've thought java erasure wipes generic types out in compile time however when i test it by myself i realized there are some information about generic types in Bytecode.here is my test :i wrote 2 classes:import java.util.*;public class Test

Why are touch events destroying my Android framerate?

Why are touch events destroying my Android framerate?

I'm developing a game for Android. It's got a lot going on but is running reasonably smoothly. That is, of course, until the user touches the screen.While they're touching it, onTouchEvent is called (with action = ACTION_MOVE, x = 0 and y =

Learning emacs - useful mnemonics?

Learning emacs - useful mnemonics?

Are there any mnemonics or patterns that make memorizing emacs key combos easier? 1:Well, the main important ones are: `C-k to "Kill" a line and C-y to "Yank" it back from the kill buffer (aka: clipboard). C-s to "Search "C-h for "Help"C

How to design a data structure that allows one to search, insert and delete an integer X in O(1) tim

How to design a data structure that allows one to search, insert and delete an integer X in O(1) tim

Here is an exercise (3-15) in the book "Algorithm Design Manual". Design a data structure that allows one to search, insert, and delete an integer X in O(1) time (i.e. , constant time, independent of the total number of integers stored). A

Create HTML table using javascript

Create HTML table using javascript

New Here. My knowledge level is hobbyist. My question will ultimately be related to this site:http://dbtest.net16.net/ethanol-01.htmlEDIT: View unencrypted page source code here >>> http://dbtest.net16.net/ethanol-22.htmlThis is an HTML f

Get the difference between two branches in Git

Get the difference between two branches in Git

I did following (I simplified this comparing to a reality):created a branch Branch1, switched to itadded file File1 and modified existing file File2 and commited thisfigured out that I don't need File1, removed it and commited thisSo, the a

PostgreSQL Mountain Lion socket issue

PostgreSQL Mountain Lion socket issue

I've been trying to set up PostgreSQL on my system (OSX 10.8, clean install), but I'm running into trouble with using psql, createdb, etc. I've tried various solutions and none seem to work.The install was successful, and I proceeded to fix

Excel CSV. file with more than 1,048,576 rows of data

Excel CSV. file with more than 1,048,576 rows of data

I have been given a CSV file with more than the MAX Excel can handle, and I really need to be able to see all the data. I understand and have tried the method of "splitting" it, but it doesnt work.Some background: The CSV file is an Excel C

Recording and storing high-res hand drawing

Recording and storing high-res hand drawing

Are there any advanced solutions for capturing a hand drawing (from a tablet, touch screen or iPad like device) on a web site in JavaScript, and storing it on server side?Essentially, this would be a simple mouse drawing canvas with the spe

Why does heap sort have a space complexity of O(1)?

Why does heap sort have a space complexity of O(1)?

I understand that both quick sort and merge sort need O(n) auxiliary space for the temporary sub-arrays that are constructed, and in-place quick sort requires O(log n) auxiliary space for the recursive stack frames. But for heap sort, it se

What is the public URL for the Github public keys

What is the public URL for the Github public keys

I heard that there was a public URL for all users on github where you can access their public keys or they can supply that URL of all their public keys. Is this true? If so what is that URL. Does it exist for bitbucket as well? 1:You can