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• Is it save to read global data from multiple threads?

  - by user362515

  The scenario is as follows: Create an instance of a class (std::map) and sore it as global variable. Spawn threads. Threads read and use the same global instance of the class All spawned threads quit Global class instance is destroyed No mutex, no thread modifies the global class instance. Is it ok? Thank You

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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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• 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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• 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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• How do I check to see if a column is in an xsd?

  - by Timmy

  Is there a simple way to see if the xsd code generating C# code has a particular column? Or if you can reference a variable column? table.getColumn("column") instead of table.column?

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• JQuery: Get SRC for each image that has specific atrtibute

  - by adbox

  Hey Guys, I am wokring on a dialog, where in execution I want to round up all items that have a specific attribute and place an attribute value of their's into a comma delited list. This is as far as I have gotten, which isnt far. buttons: { 'Hook': function(){ $('.grid_pic:has(border=3)').(loop through id's, grab src, build variable with srcs comma delimeited) } Any ideas?

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• access session value during concurrent requests

  - by user283405

  I have following problem. in one request i am updating session variable. in the other request, i am trying to access that session value, but it was blocked until the first request finish. I am using C# with ASP.NET 2.0

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• Does Oracle have an equivalent of SQL Server's table variables?

  - by Margaret

  In SQL Server, you can declare a table variable (DECLARE @table TABLE), which is produced while the script is run and then removed from memory. Does Oracle have a similar function? Or am I stuck with CREATE/DROPs that segment my hard drive?

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• PHP: Change color of text based on $value

  - by Kevin Brown

  What's the easiest way to change a text's color based on a variable? For example: If $var is between 1-5, green. Between 6-10, Orange. Greater than 11, Red.

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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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• 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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• 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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• 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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• 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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• 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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• '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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• 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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• 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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• How to validate if an HTMLLIElement is hidden with jQuery

  - by Hanzel

  I'm iterating through a variable called content, it contains several HTMLLIElement objects. How can i use jQuery's or JavaScript's functions with this object?, what I'm trying to do is the kind of validation written in the commented code. $.each(content, function(index, value){ //if(!value.is(':hidden')){ console.log(index + ' : ' + value); //} }); What I'm getting is Uncaught TypeError: Object # has no method 'is' If I do value.getAttribute('style'); I get 'display: none;'

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• In PHP: Declaring an array or initializing an array?

  - by idrinkbeertopeesquirrrrrr

  Technically speaking, how would you call creating a variable of the array type (ie. $arr= array();): declaring an array or initializing an array?

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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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• 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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• 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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