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• What's the benefit of function refrence?

  - by SpawnCxy

  When I reading the code of CodeIgniter,I found some functions written as follows: function &get_instance() { global $CI, $OBJ; if (is_object($CI)) { return $CI; } return $OBJ->load; } I can understand variable refrence,but I can hardly get this through.Is it necessary to use this function style?And any benefit? Thanks.

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• Why subtract a value from itself (x - x) in Python?

  - by endolith

  In NumPy functions, there are often initial lines that do checking of variable types, forcing them to be certain types, etc. Can someone explain the point of these lines? What does subtracting a value from itself do? t,w = asarray(t), asarray(duty) w = asarray(w + (t-t)) t = asarray(t + (w-w))

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• How to track how many times an iPhone app is opened?

  - by Jason

  I am building an iphone app and would like to keep track of how many times it has been opened so that I can prompt the user to do certain actions after it has been opened X number of times. I have thought about storing a variable in Core Data which I update every time it is opened, but this seems like a waste since it is a singleton data, not multiple instances of an object. What is the best way to store data like this and access it without slowing down the app opening time?

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• SQLite Select an id which is smaller than a number

  - by user345039

  Hi, I am trying to only select the objects where the id is smaller than an int value. e.g.: i have 3 objects - id = 1, id = 2, id = 3 Now I want to only get the objects with the id smaller than the variable i = 2; How can I manage this? sql = "SELECT id FROM table_name WHERE id <= i"; Thanks ;-)

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• Evaluate empty or null JSLT c tags

  - by user338381

  How can I validate a String null or empty using the c tags of JSLT. I have a variable of name var1 and I can display it, but I want to add a comparator for validate it. I want to validate when is different of null or empty (my values are string).

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• Dynamic allocation in C

  - by Kerby82

  I'm writing a program and I have the following problem: char *tmp; sprintf (tmp,"%ld",(long)time_stamp_for_file_name); Could someone explain how much memory allocate for the string tmp. How many chars are a long variable? Thank you, I would appreciate also a link to an exahustive resource on this kind of information. Thank you

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• what is the code for the following?

  - by kkol

  a difficult one.. using classes of primitive types in java, like Integer, Float, Long, etc, write a code fragment using a method to double the value of a variable passed as an argument

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• Java / MySQL - How to access connection from another class?

  - by Alex

  I'm just getting my head around java (and OOP for that matter), the only thing I am familiar with is MySQL. I need to keep the DB connection open throughout the duration of the application, as well as a server socket. I'm not even sure if they both need separate classes, but here's what I have so far: http://pastebin.com/qzMFFTrY (it wouldn't all go in a code tag) The variable I need is con for line 86.

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• Map to String in Java

  - by Dan

  When I do System.out.println(map) in Java, I get a nice output in stdout. How can I obtain this same string representation of a Map in a variable without meddling with standard output? Something like String mapAsString = Collections.toString(map)?

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• mysql queries - performance loss by putting numbers in quotes?

  - by Haroldo

  If a variable will always be a number, is there a performace loss by putting it in inverted commas? for example "SELECT prod.product_name FROM prod WHERE prod.id = '$id'";

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• Fetch html page content into a var

  - by Cipher

  Just a small question here, that how do we get fetch the html content via ajax into a variable that I could use later. Right now, I have a button on the click of which, I fetch another html page simply through load method as follows: $('#container').load('http://127.0.0.1/someUrl') I want to get the content into a var instead that I could at a later time use to append to the dom $('#someContainer').append(someVar)

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• How do I obtain the ASCII code of a character?

  - by sterh

  Hello, I have a char variable, declared for example as: char a = 's'; How can I get the ASCII code of this symbol? Thank you.

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• writing string into file before calling the close()

  - by navinbecse

  I am using ofstream() to write data into file, i want to program to perform such a way that it should be keep on writting the string into the file as soon as the value gets assingned to string variable, and it should be writting before calling the close() for the buffer and while the program runs itself. can anyone help me to do that in c++.........

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• Formulate POST request in curl

  - by user1867256

  I'm using curl to send POST request to web service http ://localhost 2325//Service How can I desirialize body of the POST request into a variable which I could then access within my POST method ? Can someone give me an example? This is my method [WebInvoke(RequestFormat = WebMessageFormat.Json, UriTemplate = "/user", Method = "POST")] public void Create(User us) Class User contains user_id and user_name. Can anyone please help? All I need is an example how to formulate POST request in curl Thanks

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• Values of Integers and Calculations

  - by inferno2991

  Say you have a variable n1 which will be the value of three digits entered how can i then without knowing what exactly will be input split n1 into 3 seperate integers to do futher calculations with?

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• What does “@public” mean in Objective-C?

  - by Ty

  After reading a question on @private I understand how that works. However, since all variables default to @protected and you cannot really access a variable without defining an accessor, what exactly does @public do? When would you use it?

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• Is there a way to compare date "strings" in C# without converting the strings?

  - by Kevin

  I have two fields: string date1 = "04/26/10"; string date2 = "04/25/10"; How can I compare these two fields like so?: if (date2 <= date1) { // perform some code here } Can this be done without first converting the fields to a separate date-type variable?

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• Is there a good Python library that can parse C++?

  - by csbrooks

  Google didn't turn up anything that seemed relevant. I have a bunch of existing, working C++ code, and I'd like to use python to crawl through it and figure out relationships between classes, etc. EDIT: Just wanted to point out: I don't think I need or want to parse every bit of C++; I just need something smart enough to pick up on class, function and member variable declarations, and to skip over function definitions.

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• How can I replace all occurrences of a dollar ($) with an underscore (_) in javascript?

  - by Ryan Tomlinson

  As the title states, I need to relace all occurrences of the $ sign in a string variable with an underscore. I have tried: str.replace(new RegExp('$', 'g'), '_'); But this doesn't work for me and nothing gets replaced.

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• Works on development server but it doesn't on Google App Engine (Sessions).

  - by grep

  Hi, I have this code that works just fine on the development server but when I deploy the application, the session isn't created. What am I doing wrong? HttpSession session = req.getSession(true); session.setAttribute("loggedIn", new String("true")); Edit: The sessions are enabled. What I realized now is that the _ah_SESSION variable is not being created, not even on the development server (although it works).

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• 'if' in prolog?

  - by jreid9001

  Probably a stupid question, but I can't find any documentation anywhere for it. Is there a way to do an if in prolog, e.g. if a variable is 0, then to do some actions (write text to the terminal). An else isn't even needed, but I can't find any implementation of if.

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• Making one value "special"

  - by SplashHit

  What is the "computer science" term for the practice of assigning a special meaning to one of a type's values. For example a numeric variable called "amount_to_transfer" where the special value "0" means "entire account balance" or a date value "spouse_date_of_birth" where "1/1/1800" means "unmarried". I happen to feel that this is quite a bad "smell", but I'd like to have a name for it, and if possible, some blog post or article about why it's bad and how to fix it.

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• Matching part of website with a regexp.

  - by richardverbruggen

  With a cURL request I load a complete website into a variable: $buffer. In the source of the site there are two labels in between which my relevant content is placed. ****** bunch of code ******* <!-- InstanceBeginEditable name="Kopij" --> this part I want to store in a match <!-- InstanceEndEditable --> ****** bunch of code ******* I've been messing around with preg_match and its regexp. Can someone try to help me? Thanx in advance.

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• How to read _popen directly without piping it to file?

  - by karikari

  How can I write the output of this line of code to a float variable instead of piping it to a file? The output of this line is a floating number. FILE *child = _popen("java -jar c:\\simmetrics.jar c:\\chtml.txt c:\\thtml.txt", "r");

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• Sending multiple checkbox options

  - by Grunje_D_D

  Hi, I'm creating a used cars website (written in PHP), and I'm stuck on sending advanced search options from form. I have more than 30 of them and I wonder if it's possible, and how, to send them in one variable (for example &options=1,2,3,5,6,10 or some other way..). Also I've heard that this is possible with "bitwise" but I don't have a clue how to do that. Or if someone have a better idea, please let me know. Thanx

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