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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 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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• 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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• 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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• 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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• difference between #define and enum{} in C

  - by guest

  when should one use enum {BUFFER = 1234}; over #define BUFFER 1234 ? what are the advantages enum brings compared to #define? i know, that #define is just simple text substitution and enum names the constant somehow. but why would one need that at all?

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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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• asp.net selecting a checkbox from the grid view

  - by baburam

  i am trying to get checkbox value ,using c# In grid view the datasource is from oracle i have added the checkbox but the value is not coming please help me in checking the value of check box this is for selecting the candidate if the checkbox is selected the particular candidate name is selected and the candidate names are appended in a string

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• Search within HTML files

  - by SKk

  Hi Forum, In my iPhone project,I have number of HTML files having different textual and image contents within each file. I need to implement search facility which would return results (HTML file names) having matched keyword. Can anybody have any clue, how can I achieve this? Thanks

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• access parametrically values of variables inside environments

  - by Apostolos

  Let's say we have one or more environments and variables in them. My question is how we access the values of these variables, parametrically. rm(list = ls()) env1 <- new.env() env1$var1 <- "value1" env2 <- new.env() env2$var2 <- "value2" env <- ls.str(mode="environment") # We get the environments var <- ls.str(eval(parse(text = env[1])))# We get the variables of an environment eval(var[1]) # We fail to get the value of a variable Thank you all, in advance

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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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• php: avoiding __get in certain circumstances?

  - by user151841

  I have a class where I'm using __set. Because I don't want it to set just anything, I have an array of approved variables that it checks before it will actually set a class property. However, on construct, I want the __construct method to set several class properties, some of which are not in the approved list. So when construct happens, and I do $this->var = $value, I of course get my exception that I'm not allowed to set that variable. Can I get around this somehow?

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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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• 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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• What do I use for CONTACTS_IMPORT_CALLBACK in django-friends friends application?

  - by chris

  I am trying to figure out what is needed for the CONTACTS_IMPORT_CALLBACK variable in django-friends or django-contacts-import applications (contact import is built from friends). I have tried view models, etc.. but everything throws errors. Neither application has documentation so I am just grasping at straws for what is needed. Can anyone point me in the right direction?

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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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• Get the value of <option> from views to the controller

  - by Godwin

  Since html do not have the attribute 'name',I am looking for a way to accept the value of , which I populated in views, in the controller and assign it a variable name for another use.

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• Select a record that has a duplicate

  - by Josh K

  I'd like to select all records from a table (names) where lastname is not unique. Preferrably I would like to delete all records that are duplicates. How would this be done?

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• Way to call super(MyClass, self).__init__() without MyClass?

  - by Mark

  I find this syntax astoundingly annoying. Every time I rename my class, I have to change this call for no apparent reason. Isn't there some __class__ magic variable or something I can use at least? Interested in answers for Python 2.5, but it doesn't hurt to know if later versions fixed this.

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• PHP: array('function' => 'theme_select_as_checkboxes')

  - by Patrick

  hi, what does this construct mean in PHP ? It is storing a variable called "function" with his String value in an array ? array('function' => 'theme_select_as_checkboxes') thanks

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• changing panel color

  - by user161004

  i have a string which stores the name of a color. Through the help of this variable i need to change the panel background. how can it be done???

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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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• Is there a way to group `<li>` elements?

  - by Itay Moav

  I need to divide into groups several <li> elements in a list, is it possible? (I know I an give each element different class names/separate into different <ul>)

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• Oracle/SQL table attribute question

  - by UnceRawr

  I have been given a context schema for a database i need to make for my coursework but some of the attributes (column names) contain letters in brackets at the end of them such as: *x_Number (Adm) *x_Number (A) *x_Number (P) The problem is i have no idea what these letters mean! Can anyone help?

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