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• What exactly is a variable in C++?

  - by FredOverflow

  The standard says A variable is introduced by the declaration of an object. The variable's name denotes the object. But what does this definition actually mean? Does a variable give a name to an object, i.e. are variables just a naming mechanism for otherwise anonymous objects? Or is a variable the name itself? Or is a variable a named object in the sense that every variable is also an object? Or is a variable just a "proxy" with a name that "delegates" all operations to the real object? To confuse things further, many C++ books seem to treat variables and objects as synonyms. What is your take on this?

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• how to read hindi text from a file in c++ ??

  - by yogeshbablu

  A file contains hindi text. I want to read this file and perform some operations on text it contains. So, if anyone could please explain how to read it from file and handle it(or just print it). Ex: if file contains ?? ?? ?????? ???? then my program should read this content from file and print above text on standard output. I want to perform it on Linux. Direct code will be more beneficial.

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• Updateable Priority Queue

  - by user1427661

  Is there anything built into the C++ Standard Library that allows me to work in a priority queue/heap like data structure (i.e., can always pop the highest value from the list, can define how the highest value is determined for custom classes, etc.) but allows me to update the keys in the heap? I'm dealing with fairly simple data, pairs to be exact, but I need to be able to update the value of a given key within the heap easily for my algorithm to function. WHat is the best way to achieve this in C++?

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• Perl scraping script not recognising certain characters

  - by user1849286

  I have a script that works fine locally but on the server fails. It displays the non-breaking space symbol &nbsp; as ? when printing to standard output. In the parsing of the page, if I try to get rid of non breaking space symbol with s/&nbsp;//g nothing happens, neither getting rid of the question mark s/?//g It seems to stick no matter what. Bizzarely, this is not an issue when running the script locally. Additionally, question marks within a diamond symbol are inserted everywhere (on both the server script and the local script) instead of apostrophes, although at least that is not causing the parsing of the page to break on the local page. Confused, pls help.

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• xmlhttprequest vs jquery load();

  - by testkhan

  i am trying to making php ajax based chat system....and i have developed it successfully...i am using jquery load() with setInterval to reload chat every 1 second and it works fine on my localhost....but when i uploaded it on my hosting server it also works fine ... but problem is that after few mintues of chat the server takes to much long gets heavy loaded so that my server goes and and site goes down... my question is that, why it is happening so far...and what is the solution...should i use standard xmlhttprequest instead of load() or $.ajax() instead of load();

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• Waiting on threads

  - by Paul Reiners

  I have a method that contains the following (Java) code: doSomeThings(); doSomeOtherThings(); doSomeThings() creates some threads, each of which will run for only a finite amount of time. The problem is that I don't want doSomeOtherThings() to be called until all the threads launched by doSomeThings() are finished. (Also doSomeThings() will call methods that may launch new threads and so on. I don't want to execute doSomeOtherThings() until all these threads have finished.) This is because doSomeThings(), among other things will set myObject to null, while doSomeOtherThings() calls myObject.myMethod() and I do not want myObject to be null at that time. Is there some standard way of doing this kind of thing (in Java)?

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• Using AWS S3 for photo storage

  - by Sam

  I'm going to be using S3 to store user uploaded photos. Obviously, I wont be serving the image files to user agents without resizing them down. However, not one size would do, as some thumbnails will be smaller than other larger previews. So, I was thinking of making a standard set of dimensions scaling from the lowest 16x16 to some highest 1024x1024. Is this a good way to solve this problem? What if I need a new size later on? How would you solve this?

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• Serializing to JSON in jQuery

  - by Herb Caudill

  I know how to serialize an object to JSON in ASP.NET Ajax, but I'm trying to do things on the client in a less Microsoft-specific way. I'm using jQuery. Is there a "standard" way to do this? My specific situation: I have an array defined something like this: var countries = new Array(); countries[0] = 'ga'; countries[1] = 'cd'; ... and I need to turn this into a string to pass to $.ajax() like this: $.ajax({ type: "POST", url: "Concessions.aspx/GetConcessions", data: "{'countries':['ga','cd']}", ... Edit (clarification) I realize there are a number of JSON libraries out there, but I'd like to avoid introducing a new dependency (if I'm going to do that, I might as well use ASP.NET Ajax's built-in JSON serializer).

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• Will Haskell be a good choice for my task?

  - by Narzanka

  I'm starting a new project and don't know which language to use. My 'must have' requirements are: Be able to run on Windows/LinuxMacOs natively (native executable) - user should be able to just run the exe (when on Windows for example) and see the results. No runtimes/interpreters (no jvm, clr, etc) - one file download should be enough to run the application. Full unicode support. Be able to manipulate OS threads (create them, run multiple tasks in parallel on multi-core CPUs, etc). Be reasonably fast (Python level performance and better). To have some kind of standard library that does low-level, mundane tasks. Not very niche and have some community behind it to be able to ask questions. My 'nice to have' requirements are: Language should be functional It should have good string manipulation capabilities (not necessarily regex) Not extremely hard to learn I'm thinking about Haskell now but keeping in mind OCaml as well. Please advice if my choice is correct.

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• Custom Header Menu in Android App (How To)

  - by masterkrang

  I'm trying to implement a custom header menu in my Android application and I'm wondering what the standard or best practice for creating a header menu. I'm thinking something like the facebook app that displays a log and has some action items like triggering a search and possibly return back to the main activity. Tab Layout doesn't seem to be what I'm looking for. I found a tutorial here that might be close to what I'm looking for but not sure. It seems a bit redundant to instantiate a menu in every Activity. Seems like there would be a way to decouple the Activity from the menu, or at least more loosely couple it. Perhaps I need to implement something with Fragments but I'm sort of new, so I'm not sure yet. Looking forward to your suggestions or hearing how you've implemented something like this. Thanks!

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• Data Structure Brushup (Java)

  - by Daddy Warbox

  This should be easy for many of you, but for me it's just another bit of rust needing to be chipped away as I get back into basic Java coding. Using bloody associative arrays for so long in other languages have turned me nice and spoiled. :P My problem is simple: I'm storing a set of objects, each containing a string and a number, in a list. I would like each object inserted into this list to be sorted alphabetically by its string. I would also like to be able to retrieve objects from the list by their string as well. I would like to do this as formally and/or efficiently as possible. Is there something already available in the Java standard libraries for this?

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• referencing struct fields in c with square brackets and an index instead of . and ->?

  - by lsiebert

  Assuming I have a structure such as: typedef struct { char * string1; char * string2; } TWO_WORDS; such that all the fields are of the same type, and my main has TWO_WORDS tw; can I reference string1 with tw[0] and string2 with two[1]? If so: is this part of the c standard? do i have to cast the struct to an array first? what about fields which are different sizes in memory what about fields which are different types but the same size? can you do pointer arithmetic within a structure? -

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• Where can I find a compact programming keyboard with logical key placement?

  - by Lefler

  I recently, at the order of my chiropractor, bought a laptop stand to elevate my screen. A result of this is that I need a standalone keyboard. Normal keyboards have numeric keypads on the right side, which moves my mouse further to the right... not an optimal position chiropractically speaking. I don't use the numeric keypad, but all the compact keyboards I can find use some random placement algorithm on the arrow, page up/down, and most importantly -- the insert,delete,home and end keys. Those misplaced keys are crippling my code entry. Does anyone know of a keyboard that is minus the keypad, but places those VERY IMPORTANT keys in a more standard position?

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• SQL to get rows (not groups) that match an aggregate

  - by xulochavez

  Given table USER (name, city, age), what's the best way to get the user details of oldest user per city? I have seen the following example SQL used in Oracle which I think it works select name, city, age from USER, (select city as maxCity, max(age) as maxAge from USER group by city) where city=maxCity and age=maxAge So in essence: use a nested query to select the grouping key and aggregate for it, then use it as another table in the main query and join with the grouping key and the aggregate value for each key. Is this the standard SQL way of doing it? Is it any quicker than using a temporary table, or is in fact using a temporary table interanlly anyway?

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• Where can I find the project templates for ASP.NET MVC 1.0?

  - by Jason

  I would like to edit the ASP.NET MVC templates for Visual Studio so that any new action or controller created has a specific piece of code within it by default. For instance, I'd like to replace the generated: public ActionResult MyAction() { return View(); } with a specific coding standard we prefer to use within in my team. eg: public ActionResult About() { try { DoStuff(); return View(); } catch(Exception) { HandleException(); } } I've looked through the filesystem, but I cannot find anything specific that relates to the ASP.NET mvc templates. Anyone know where they are?

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• Given the lat/lon of 2 close points on earth (<10m), How do I calculate the distance in metres?

  - by Rory

  I have the lat/lon of 2 points on the earth. They are really close together, <10m. Let's assume the earth is flat. How do I calculate the distance between them in metres? I know about tools (PostGIS, etc.) that can do this correctly, however I'm just doing a rough and ready type, and I'm OK with low accuracy. At such small sizes a difference of 1% is only 10cm, which is fine for me. I'm doing this in stock python. I'm OK with a standard Euclidean distance thing.

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• JQuery - Widget Public Methods

  - by Steve

  If I create a JQuery widget (code example below), and then define a "public" method, is there any other way to call the method other than using the following form? $("#list").list("publicMethod"); I would like to create a series of widgets that all define the same methods (basically implementing the same interface), and be able to call the method without knowing anything about which widget I currently am invoking the method on. In the current form, I need to know that I am executing the method on the "list" widget. Below is an example of creating a widget with the "public" method. (function($) { var items = []; var itemFocusIdx = 0; $.widget("ui.list", { // Standard stuff options : { ... }, _create : function() { ... }, destroy : function() { ... }, // My Public Methods publicMethod : function() { ... } ... }); }(jQuery));

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• Trying to send XML via EMail and the XML includes a byte[]

  - by barbary

  Hello All, I want to send an email that has a machine readable part you cut and paste into an asp.net page and you get the information. I have stored all the information in an object and then used an XMLSerizer to create some xml. It all worked fine until I added some Images as byte[] to the object. If I dump the resulting string to disk then I can recreate the object fine but after it appears in the email client and I try to cut and paste it it never works. Clearly there are non standard characters coming out that email clients don't like. Is there some encoding I could apply to my XML that would make it display correctly in an email client? Then I could cut, paste, decode and deserilize to get my object back. Please an example of how to encode the string in c# would be great.

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• Jump to an anchor link on function complete in jQuery?

  - by nick92675

  I have a simple slidetoggle function that opens onclick. What I'd like to do is jump the user down to the bottom of the page following the opened div. Basically, wait for the slidetoggle to complete - then imagine clicking my jump link to pull the viewport down. Here's my code. $('#clickme').click(function() { $('#form-area').slideToggle('slow', function() { // Animation complete // what can i put here that's like my standard jumpto? }); }); <a href="#form-bottom" id="clickme">Click here</a> <div class="main" id="form-area" > Stuff </div> <a name="form-bottom"></a>

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• file_get_contents not working

  - by DCD

  I am trying to read a file in with file_get_contents () - it's a remote HTTP file, and I've checked the URL and it's fine. Only it doesn't work. More to the point the the error message is the standard Firefox server error: The connection was reset The connection to the server was reset while the page was loading. ... rather than any form of PHP error. It also only took a couple of seconds to come back so it can't be hitting the script runtime limit - any ideas on what is going wrong here? It's PHP 5 on Apache 2, running on Windows btw.

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• How to programatically set a permanent environment variable in Linux?

  - by Richard

  I am writing a little install script for some software. All it does is unpack a target tar, and then i want to permanently set some environment variables - principally the location of the unpacked libs and updating $PATH. Do I need to programmatically edit the .bashrc file, adding the appropriate entries to the end for example, or is there another way? What's standard practice? Edit: The package includes a number of run scripts (20+) that all use these named environment variables, so I need to set them somehow (the variable names have been chosen such that a collision is extremely unlikely)

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• communicate with a process in utf-8 on a cp1252 consoless

  - by Mapad

  I need to control a program by sending commands in utf-8 encoding to its standard input. For this I run the program using subprocess.Popen(): proc = Popen("myexecutable.exe", shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE) proc.stdin.write(u'ééé'.encode('utf_8')) If I run this from a cygwin utf-8 console, it works. If I run it from a windows console (encoding ='cp1252') this doesn't work. Is there a way to make this work without having to install a cygwin utf-8 console on each computer I want it to run from ? (NB: I don't need to output anything to console)

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• can constructors actually return Strings?

  - by elwynn

  Hi all, I have a class called ArionFileExtractor in a .java file of the same name. public class ArionFileExtractor { public String ArionFileExtractor (String fName, String startText, String endText) { String afExtract = ""; // Extract string from fName into afExtract in code I won't show here return afExtract; } However, when I try to invoke ArionFileExtractor in another .java file, as follows: String afe = ArionFileExtractor("gibberish.txt", "foo", "/foo"); NetBeans informs me that there are incompatible types and that java.lang.String is required. But I coded ArionFileExtractor to return the standard string type, which is java.lang.string. I am wondering, can my ArionFileExtractor constructor legally return a String? I very much appreciate any tips or pointers on what I'm doing wrong here.

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• OpenId + Bort + google

  - by zakurahime

  Hi I'm new in using ruby and i wanted to implement the openid feature that came with the bort template... I used the google openid url https://www.google.com/accounts/o8/id in the sign up but it cant get the email that i used in the openid login.. here's a part of my code... its the standard code from the bort template def create logout_keeping_session! if using_open_id? authenticate_with_open_id(params[:openid_url], :return_to => open_id_create_url, :required => [:nickname, :email]) do |result, identity_url, registration| if result.successful? create_new_user(:identity_url => identity_url, :login => registration['nickname'], :email => registration['email']) else failed_creation(result.message || "Sorry, something went wrong") end end else create_new_user(params[:user]) end end i will really appreciate any help on this.. i've been stuck with this for a few days now.. thanks

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• If I write a framework that gets information from the Internet, should I make a degelate or use blocks?

  - by Time Machine

  Say I'm writing a publicly available framework for the Vimeo API. This framework needs to get information from the Internet. Because this can take some time, I need to use threadin to prevent the UI from hanging. Foundation uses delegates for this, like NSURLConnectionDelegate. However, Game Kit uses blocks as callback functions. What is the recommended way of doing this? I know blocks aren't supported in standard GCC versions, but they require less, much less code for the one that uses my framework. Delegates, on the other hand, are real methods and when protocols are used, I'm sure the methods are implemented. Thanks.

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