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  • How to tell where I am in an array with pointer arythmetic?

    - by klez
    In C, I have declared a memory area like this: int cells = 512; int* memory = (int*) malloc ((sizeof (int)) * cells); And I place myself more or less in the middle int* current_cell = memory + ((cells / 2) * sizeof (int)); My question is, while I increment *current_cell, how do I know if I reached the end of the allocated memory area?

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  • Why is C++ backward compatible with C ? Why isn't there some "pure" C++ language ?

    - by gokoon
    C and C++ are different languages, blababla we know that. But if those language are different, why is it still possible to use function like malloc or free ? I'm sure there are all sort of dusty things C++ has because of C, but since C++ is another language, why not remove those things to make it a little less bloat and more clean and clear ? Is it because it allows programmers to work without the OO model or because some compilers doesn't support high-level abstract features of C++ ?

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  • Ruby-on-Rails equivalent to ORM Designer for Symfony?

    - by fayer
    In Symfony i just have to create models with ORM Designer and export it to symfony as a schema.yml and then use a symfony command to create tables, models and forms. I wonder if there is an equivalent to the RoR so that you dont have to create models manually by hand? It saves a lot of time using GUI for this kind of tasks and it is less error-prone. thanks

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  • Good way to create PDF from Office documents in Java

    - by Sindri Traustason
    I'm looking for a good way to convert Office (mostly Microsoft) documents to PDF in Java. I've been looking at using the OpenOffice SDK but from the samples I've looked at it looks like this requires having OpenOffice running in server mode to do the work. Does anyone know of a good way to do this? Good meaning the less external requirements, the better. A 100% Java API would be best, but I don't expect that actually exists.

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  • Is ASP.net MVC a direct copy of Ruby on Rails concepts?

    - by Greg
    Hi, I'm been developing Ruby on Rails previously. I'm now looking at an ASP.net web app and I'm looking at WebForms and MVC. As I look at MVC it feels as if I'm looking at the result of something a Ruby on Rails developer implemented after being forced to work in MS land. So I'm wondering: Was MVC more or less taken directly from Ruby on Rails and it's concepts? (either intentionally or unintentionally)

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  • convert portion of code into a function php

    - by user765368
    This is probably very easy to do but for some reason I can't seem to figure this out. Let's say I have code like this: $elements = array('a', 'b', 'c', 'd'); $myValues = array( 'values' => array( 'a' => array( 'xx' => 3, 'yy' => '' ), 'b' => array( 'xx' => '', 'yy' => '' ), 'c' => array( 'xx' => 8.4, 'yy' => '' ), 'd' => array( 'xx' => 18.4, 'yy' => '' ) ) ); foreach($elements as $elem) { if($myValues['values'][$elem]['xx'] != '') { if($myValues['values'][$elem]['xx'] < 6) { $myValues['values'][$elem]['yy'] = 'less than 6'; } elseif($myValues['values'][$elem]['xx'] >= 6 && $myValues['values'][$elem]['xx'] < 15) { $myValues['values'][$elem]['yy'] = 'between 6 and 16'; } else { $myValues['values'][$elem]['yy'] = 'greater than 15'; } testFunc($myValues['values'][$elem]['xx']); // This is how I would call my function once I replace the code above } } As you can see here what I'm trying to do is to change the value of $myValues['values'][$elem]['yy'] based on some conditions. What I want to do is to replace the if elseif else section of codes by a function that performs the same action. I tried something like: function testFunc($xx) { if($xx < 6) { $yy = 'less than 6'; } elseif($xx >= 6 && $xx < 15) { $yy = 'between 6 and 16'; } else { $yy = 'greater than 15'; } return $yy; } But obviously this won't work because I'm not changing the value of $myValues['values'][$elem]['yy'] inside my function. NOTE I really want to pass ONLY the value of $myValues['values'][$elem]['xx'] inside my function and return the changed value of $myValues['values'][$elem]['yy']. Can anybody help me with this? Thanks in advance

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  • Twitter Search API is returning weird characters - is it more or is it them?

    - by DanSingerman
    We are building an app that accesses the Twitter search over JSONP. It mostly works fine, but occasionally the request returns a JSONP callback that exists of weird unparseable characters. Here is an example: http://search.twitter.com/search.json?result_type=recent&rpp=100&geocode=51.4375857,-0.1658648,1km&page=5&callback=jsonp1272532482854 (If you change page=5 to a value less than 5 in the URL it works fine) So Am I doing something wrong? Can anyone suggest a workaround?

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  • multiline sed using backreferences...

    - by pagid
    Hi, I'm converting patch scripts using a commandline script - within these scripts there's the combination two lines like: --- /dev/null +++ filename.txt which needs to be converted to: --- filename.txt +++ filename.txt Initially I tried: less file.diff | sed -e "s/---\/dev\null\n+++ \(.*\)/--- \1\n+++ \1/" But I had to find out that multiline-handling is much more complex in sed :( Any help is appreciated...

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  • Handling of data truncation in FUSE

    - by Vi
    I expect any good program should do all their reads and writes in a loop until all data written/read without relying that write will write everything (even with regular files). Am I right? Implemented simple FUSE filesystem which only allows reading and writing with small buffers, very often returning that it is written less bytes that in a buffer (using -o direct_io). Some programs work, some not. Are them buggy or programs should not expect truncated writes and reads from the regular files?

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  • What are the disadvantages of using Antlr?

    - by ajay
    I've worked on Flex, Bison few years ago during my undergraduate studies. However, I don't remember much about it now. Recently, I have come to hear about Antlr. Would you recommend that I learn Antlr or better to brush up Flex/Bison. Does Antlr have more/less features than Flex/Bison ? Thanks,

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  • simplify expression k/m%n

    - by aaa
    hello. Simple question, is it possible to simplify (or replace division or modulo by less-expensive operation) (k/m)%n where variables are integers and operators are C style division and modulo operators. what about the case where m and n are constants (both or just one), not based 2? Thank you

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  • User name form validation message

    - by Samuel
    I have a form validation message for the user name field which says the following Name can only contain alphabets, '.' and ' ' characters OR should it be Name can only contain alphabets, dot and space characters OR should it be Name can only contain alphabets, dot (".") and space (" ") characters Which is preferable from a usability perspective assuming the end users has very less exposure to computers.

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  • C#, add references manually

    - by A B
    Is there anyway I can make the process of adding references to C# projects less painfull? Every time I create a new C# class library project. I have to use the Add Reference dialog for 5 times at least.

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  • rpxnow - How to promote users to sign in

    - by Harry
    Since adding rpxnow to our website, less users are signing in. Are these readers worried about giving their (eg hotmail) password to a third party site? Has anyone found a good way to promote use of rpxnow (or other openid managers) as a secure method of authentication to non tech savvy readers?

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  • Facebook Connect in Silverlight

    - by Mike Pateras
    Is there a good way to get Facebook Connect onto a Silverlight page? All I really need is simple authorization/registration. I've looked into the facebook developer toolkit, but the documentation is more or less non-existent for Silverlight, and I didn't really get anywhere with it. Is there a good tutorial or a working library for adding Facebook Connect into a Silverlight app? Or is the best way to run Silverlight in Windowwless mode with HTML overlayed on top?

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  • How to reconcile my support of open-source software and need to feed and house myself?

    - by Guzba
    I have a bit of a dilemma and wanted to get some other developers' opinions on it and maybe some guidance. So I have created a 2D game for Android from the ground up, learning and re factoring as I went along. I did it for the experience, and have been proud of the results. I released it for free as ad supported with AdMob not really expecting much out of it, but curious to see what would happen. Its been a few of months now since release, and it has become very popular (250k downloads!). Additionally, the ad revenue is great and is driving me to make more good games and even allowing me to work less so that I can focus on my own works. When I originally began working on the game, I was pretty new to concurrency and completely new to Android (had Java experience though). The standard advice I got for starting an Android game was to look at the sample games from Google (Snake, Lunar Lander, ...) so I did. In my opinion, these Android sample games from Google are decent to see in general what your code should look like, but not actually all that great to follow. This is because some of their features don't work (saving game state), the concurrency is both unexplained and cumbersome (there is no real separation between the game thread and the UI thread since they sync lock each other out all the time and the UI thread runs game thread code). This made it difficult for me as a newbie to concurrency to understand how it was organized and what was really running what code. Here is my dilemma: After spending this past few months slowly improving my code, I feel that it could be very beneficial to developers who are in the same position that I was in when I started. (Since it is not a complex game, but clearly coded in my opinion.) I want to open up the source so that others can learn from it but don't want to lose my ad revenue stream, which, if I did open the source, I fear I would when people released versions with the ad stripped, or minor tweaks that would fragment my audience, etc. I am a CS undergrad major in college and this money is giving me the freedom to work less at summer job, thus giving me the time and will to work on more of my own projects and improving my own skills while still paying the bills. So what do I do? Open the source at personal sacrifice for the greater good, or keep it closed and be a sort of hypocritical supporter of open source?

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  • c++ std::ostringstream vs std::string::append

    - by NickSoft
    In all examples that use some kind of buffering I see they use stream instead of string. How is std::ostringstream and << operator different than using string.append. Which one is faster and which one uses less resourses (memory). One difference I know is that you can output different types into output stream (like integer) rather than the limited types that string::append accepts. Here is an example: std::ostringstream os; os << "Content-Type: " << contentType << ";charset=" << charset << "\r\n"; std::string header = os.str(); vs std::string header("Content-Type: "); header.append(contentType); header.append(";charset="); header.append(charset); header.append("\r\n"); Obviously using stream is shorter, but I think append returns reference to the string so it can be written like this: std::string header("Content-Type: "); header.append(contentType) .append(";charset=") .append(charset) .append("\r\n"); And with output stream you can do: std::string content; ... os << "Content-Length: " << content.length() << "\r\n"; But what about memory usage and speed? Especially when used in a big loop. Update: To be more clear the question is: Which one should I use and why? Is there situations when one is preferred or the other? For performance and memory ... well I think benchmark is the only way since every implementation could be different. Update 2: Well I don't get clear idea what should I use from the answers which means that any of them will do the job, plus vector. Cubbi did nice benchmark with the addition of Dietmar Kühl that the biggest difference is construction of those objects. If you are looking for an answer you should check that too. I'll wait a bit more for other answers (look previous update) and if I don't get one I think I'll accept Tolga's answer because his suggestion to use vector is already done before which means vector should be less resource hungry.

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  • Is there any way to identify a unique user in Flash/Actionscript 3?

    - by VGambit
    I'm trying to make a vote/poll application in Flash using Actionscript 3. Is there any way to generate a specific ID that is unique to each user? The only other option I can think of is using the IP address, which is less than ideal in many cases (college campuses, shared Internet access, etc.). It needs to be the same number every time it is run on the same PC, but different for each user.

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