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• Need help eliminating dead code paths and variables from C source code

  - by Anjum Kaiser

  I have a legacy C code on my hands, and I am given the task to filter dead/unused symbols and paths from it. Over the time there were many insertions and deletions, causing lots of unused symbols. I have identified many dead variables which were only being written to once or twice, but were never being read from. Both blackbox/whitebox/regression testing proved that dead code removal did not affected any procedures. (We have a comprehensive test-suite). But this removal was done only on a small part of code. Now I am looking for some way to automate this work. We rely on GCC to do the work. P.S. I'm interested in removing stuff like: variables which are being read just for the sake of reading from them. variables which are spread across multiple source files and only being written to. For example: file1.c: int i; file2.c: extern int i; .... i=x;

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• PHP - "tabulate" array - make levels from elements

  - by Moha

  If I have an array like this: Array ( [0] => field_schools [1] => und [2] => 0 [3] => field_school [4] => und [5] => 0 [6] => value ) How can I make an array like this from it? array ( [field_schools] => array ( [und] => array ( [0] => array ( [field_school] => array ( [und] => array ( [0] => array ( [value] => something ) ) ) ) ) ) ) I want to specify the 'value' myself.

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• Why is there no facility to overload static properties in PHP?

  - by Jon

  Intro PHP allows you to overload method calls and property accesses by declaring magic methods in classes. This enables code such as: class Foo { public function __get($name) { return 42; } } $foo = new Foo; echo $foo->missingProperty; // prints "42" Apart from overloading instance properties and methods, since PHP 5.3.0 we can also overload static methods calls by overriding the magic method __callStatic. Something missing What is conspicuously missing from the available functionality is the ability to overload static properties, for example: echo Foo::$missingProperty; // fatal error: access to undeclared static property This limitation is clearly documented: Property overloading only works in object context. These magic methods will not be triggered in static context. Therefore these methods should not be declared static. As of PHP 5.3.0, a warning is issued if one of the magic overloading methods is declared static. But why? My questions are: Is there a technical reason that this functionality is not currently supported? Or perhaps a (shudder) political reason? Have there been any aborted attempts to add this functionality in the past? Most importantly, the question is not "how can I have dynamic static properties in userland PHP?". That said, if you know of an especially cute implementation based on __callStatic that you want to share then by all means do so.

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• How can I set a time limit for a game?

  - by Haoda Fu

  I am learning the multi-threading and timer in C# now. But it seems I can't find a good solution. For example, I would like to see how many addition problems that I can solve within 1 min. I would like my program to have A digital clock to count for 60 seconds in the top of my Console. Print a math problem in the middle of my console wait for my input. When 60 seconds is done, stop the math problem challenges immediately (most of time, it is still waiting for my input, but we will stop it immediately). Count how many correct problems that I have solved. Two challenges of the program now. a) how can we make sure the print time and math problem do not mess up. b) how can we stop the math challenges part immediately after time is up

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• What are the standard directory layouts for source code?

  - by splattered bits

  I'm in the process of proposing a new standard directory layout that will be used across all the projects in our organization. Projects can have compiled source code, setup scripts, build scripts, third-party libraries, database scripts, resources, web services, web sites, etc. This is partly inspired by discovering Maven's standard layout. Are there any other standard layouts that are generally accepted in the industry?

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• Didn't do too well on a Java IKM test, advice?

  - by Jason

  I did an IKM Java test recently and got quite a low score. I only graduated a year ago and I dont have commercial experience in Java (i do web development in my current job). I thought reading up a lot on Java would help me prepare, but when I sat the IKM test i got ripped to pieces. I didn't know much about how the garbage collection actually works, names of other java compilers (i know about javac?), using .dll with Java etc etc. I know a wide range of the basics, but to the extent wether 'int(5L)' produces an integer or not, I really didnt know. My question is that many of the IKM questions I have never come across, yet I have read many of the wider-known Java programming books (Deitel, O'Reilly etc). Am i reading the wrong books??? Could anyone recommend a good plan of action to allow me to go away and self-study and be able to know these really tough java questions?

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• Docker vs ESXi for Startup Projects - Deploying Code for Dev Testing

  - by JasonG

  Why hello there little programmer dude! I have a question for you and all of your experience and knowledge. I have an ESXi whitebox that I built which is an 8 dude that sits in the corner. I made a mistake recently and took the key that had ESXi, formatted it and used it for something else. No big deal because the last project I worked on had stalled out. I'm about to pick up another project and now I need to spin up a whole bunch of stuff for CI, qa + db, ticket tracker, wikis etc etc. I've been hearing a lot about Docker recently and as this is just a consumer grade machine, I'm wondering if it may make more sense for me to use Docker on OpenOS and then put everything there - bamboo or hudson, jira, confluence, postgress for the tools to use, then a qa env. I can't really seem to find any documents that directly compare traditional VM infrastructure vs docker solutions and I'm wondering if it is fair to compare. Is there any reason why CoreOS w/ containers would be a strictly worse solution? Or do you have any insight into why I may want to stick with ESXi? I've looked on multiple occasions and can't find a good reason not to. I'm not going to run a production env on the server so I don't need to have HA if updating security or OS for example where esxi would allow me to restart one vm at a time. I can just shut the thing down and bring it back up if I need a reboot no problem. So what's up with this container stuff? Is it a fair replacement for ESXi? I'm guessing the atlassian products would run much better and my ram would go a lot farther using docker. Probably the CPU would run much cooler too and my expensive HDD space would be better utilized.

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• Google Analytics with multiple environments

  - by marcof

  We are planning to use Google Analytics in our organization and I am in charge for setting it up. I was wondering how to deal with multiple environments. We sure do not want to collect data during development and QA (or maybe collect data to a different analytics account), but we want to when the site goes to production (obviously). How do you deal with multiple environments and Google Analytics ? Do you setup multiple accounts for Google Analytics and use either one depending on the environement ? We're using ASP.NET 2.0, if that matters.

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• PDF or ebook Java API documentation

  - by AmaDaden

  Since I have a long train ride to and from work I was wondering if there is a version of the Java API documentation floating around that I could put on my Kindle. It would be nice on the rare occasion I get something in my head that I want to think about some more. I know I can browse the web through the Kindle but coverage is spotty and slow. I know that the api docs are not really designed for a sequential reading format but I'm curious to see if anyone else has thought about this and given it a shot.

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• Licenses that i can use for my works, web apps, desktop apps, wordpress themes etc

  - by jiewmeng

  I originally thought of creative commons when while reading a book about wordpress (professional wordpress), I learned that I should also specify that the product is provided ... WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE and they recommend GNU GPL. How do I write a license or select 1? btw, what does 'MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE' mean actually? Isn't without warranty enough?

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• C#4: Why does this static field always get initialized over-eagerly?

  - by TheSilverBullet

  I am looking at this excellent article from Jon Skeet at this location: http://csharpindepth.com/Articles/General/Beforefieldinit.aspx While executing the demo code, Jon Skeet says that we can expect three different kinds of behaviours. To quote that article: The runtime could decide to run the type initializer on loading the assembly to start with... Or perhaps it will run it when the static method is first run... Or even wait until the field is first accessed... When I try this out (on framework 4), I always get the first result. That is, the static method is initialized before the assembly is loaded. I have tried running this multiple times and get the same result. (I tried both the debug and release versions) Why is this so? Am I missing something?

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• Building non (jsp/freemarker) template based website [on hold]

  - by Ismail Marmoush

  If my web app is supposed to work in one page, something like asana.com, and I wanted to make the whole website free of templates, meaning I would serve data and make js/mobile app call them, or even let other developers create new interfaces for it. So is it acceptable to have such a design for such a problem ? or you think I would eventually have use jsps/freemarker for a certain case. I found something when I started asking the right questions, here is it wiki: Single Page Application

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• The next step for a graduate?

  - by Michael Hobbs

  I will complete my degree in Computer Science in July of 2013 however I will have two years of military service left. I would like to get some hands on C#/C++ programming experience in the mean time. I have been looking around the web at all the open source project that are out there. There are literally 10's of thousands. How would you go about picking one that is: A) good for a graduate level programmer B) will probably go somewhere, and C) are willing to take a novice under their wing. I would even be happy to work for a company for free, remotely as a debugger, tester, or what have you. As a side note would prefer to stick in the C# realm but understand I need to branch out at the same time.

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• How to unit test image processing code?

  - by rold2007

  I'm working in image processing (mainly OCR) and I wonder how I should integrate unit tests in my development. I'm already using unit tests for more "common" type of code but when dealing with image processing code I'm not sure how to deal with it. This kind of code always need some image data input/output and mocking this is not obvious. For now I'm mostly doing integration tests but they take a while to run and I would like some ideas on how to break down this kind of code into unit tests so that I can run them more quickly.

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• Why the overhead when allocating objects/arrays in Java?

  - by Gnijuohz

  How many bytes an array occupies in Java? Assume It's a 64bit machine and also assume there are N elements in an array, so all these elements would take up 2*N, 4*N or 8*N bytes for different types of array. And a lecture in Coursera says that it would occupy 2*N+24, 4*N+24 or 8*N+24 bytes for a N element array and the 24 bytes is called overhead, but didn't explain why the overhead is needed. Also objects have overheads, which is 16 bytes. What exactly are these overheads? What are these 24/16 bytes composed of? Also, do these overheads only exist in Java? How about C, C++ and Python?

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• Clean MVC design when there is viewer latency

  - by Tony Suffolk 66

  It isn't clear if this question has already been answered, so apologies in advance if this is a duplicate : I am implementing a game and trying to design around a clean MVC pattern - so my Control plane will implement the rules of the game (but not how the game is displayed), and the View plane implements how the game is displayed, and user iteraction - i.e. what game items or controls the user has activated. The challenge that I have is this : In my game the Control Plane can move game items more or less instaneously (The decision about what item to place where - and some of the initial consequences of that placement are reasonably trivial to calculate), but I want to design the Control Plane so that the View plane can display these movements either instaneously or using movement animations. The other complication is that player interaction must be locked out while those game items are moving (similar to chess - you can't attack an opposing piece as it moves past one of your pieces) So do I : Implement all the logic in the Control Plane asynchronously - and separate the descision making from the actions - so the Control plane decides piece 'A' needs to move to a given place - tells the view plane, and but does not implement the move in data until the view plane informs the control plane that the move/animation is complete. A lot of interlock points between the two layers. Implement all the control plane logic in one place - decisions and movement (keeping track of what moved where), and pass all the movements in one go to the View plane to do with what it will. Control Plane is almost fire and forget here. A hybrid of 1 & 2 - The control plane implements all the moves in a temporary data store - but maintains a second store which reflects what is actually visible to the viewer, based on calls and feedback from the View plane. All 3 are relatively easy to implement (target language is python), but having never done a clean MVC pattern with view latency before - I am not sure which design is best

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• Inspirational software for end-users written in Haskell?

  - by Lenny222

  I think great technology ist invisible. Besides the usual suspects (GHC, Xmonad, proprietary trading software) what great examples are there for end-user software written in Haskell? I think good examples are FreeArc, Hledger and "Nikki And The Robots". Do you have more examples (full blown GUI apps, small CLI tools, etc)? Edit: For example i am fascinated by Wings3D, because while written in Erlang, users can not tell that. It just works. Among Haskell's weak spots are cross-platform GUIs. There are not many GUI apps written in Haskkel in general and most of them are no easy to use, install or even compile. What are good examples to learn from how to make hard things look easy?

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• git for personal (one-man) projects. Overkill?

  - by Anto

  I know, and use, two version control systems: Subversion and git. Subversion, as of now, gets used for personal projects where I am the only developer and git gets used for open source projects and projects where I believe others will also work on the project. This is mostly because of git's amazing forking and merging capabilities, where everyone may work on their own branch; very handy. Now, I use Subversion for personal projects, as I think git makes little sense there. It seems to be a little bit of overkill. It is OK for me if it is centralized (on my home server, usually) when I am the only developer; I take regular backups anyway. I don't need the ability to make my own branch, the main branch is my branch. Yes, SVN has simple support for branching, but much more powerful support for it makes no sense, I think. Merging can be a pain with it, or at least from my little experience. Is there any good reason for me to use git on personal projects, or is it just simply overkill?

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• Getting into C# and MVC4 coming from Javascript

  - by Stefan V.

  Let me know if this is the wrong place to ask this but, I am trying to get into a backend/server language coming from a front-end javascript background (vanilla, angular, jQuery and a bit of node and mongodb, also some experience with PHP and MySQL). Why C#? My company's entire server-side is MVC4. Occasionally, I am going through commits of the backend guys and have asked them all sorts of questions. A lot of what I have heard and seen just seems appealing. Anyway, I'd rather start with C# first and gradually adopt .NET MVC. Does anybody advice, tips, recommended books, etc for somebody trying to learn C# coming from a JS background?

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• How do I share different files in a git repo with different people?

  - by David Faux

  In a single directory with a Git root folder, I have a bunch of files. I am working on one of those files, X.py, with my friend Alice. The other files I am working on with other people. I want Alice (and everyone else) to have access to X.py. I want Alice to only have access to X.py though. How can I achieve this with Git? Is there a way I can split a directory into two repos? That sounds rather cumbersome. Maybe I could add a remote repo that Alice can access containing X.py?

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• Update Variable in TeamCity powershell script

  - by Jake Rote

  I am try to update an enviroment variable in teamcity using powershell code. But it does not update the value of the variable. How can i do this? My current code is (It gets the currentBuildNumber fine: $currentBuildNumber = "%env.currentBuildNumber%" $newBuildNumber = "" Write-Output $currentBuildNumber If ($currentBuildNumber.StartsWith("%MajorVersion%") -eq "True") { $parts = $currentBuildNumber.Split(".") $parts[2] = ([int]::Parse($parts[2]) + 1) + "" $newBuildNumber = $parts -join "." } Else { $newBuildNumber = '%MajorVersion%.1' } //What I have tried $env:currentBuildNumber = $newBuildNumber Write-Host "##teamcity[env.currentBuildNumber '$newBuildNumber']" Write-Host "##teamcity[setParameter name='currentBuildNumber' value='$newBuildNumber']"

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• cloud programming for OpenStack in C / C++

  - by Basile Starynkevitch

  (Sorry for such a fuzzy question, I am very newbie to cloud programming) I am interested in designing (and developing) a (free software) program in C or C++ (probably, most of it being meta-programmed, i.e. part of the C code code being generated). I am still in the thinking / designing phase. And I might perhaps give up. For reference, I am the main architect and implementor of GCC MELT, a domain specific language to extend the GCC compiler (the MELT language is translated to C/C++ and is bootstrapped: the MELT to C/C++ translator being written in MELT). And I am dreaming of extending it with some cloud computing abilities. But I am a newbie in cloud computing. (I am only interested in free-software, GPLv3 friendly, based cloud computing, which probably means openstack). I believe that "compiling on the cloud with some enhanced GCC" could make sense (for super-optimizations or static analysis of e.g. an entire Linux distribution, or at least a massive GCC compiled free software like Qt, GCC itself, or the Linux kernel). I'm dreaming of a MELT specific monitoring program which would store, communicate, and and enhance GCC compilation (extended by MELT). So the picture would be that each GCC process (actually the cc1 or cc1plus started by the gcc driver, suitably extended by some MELT extension) would communicate with some monitor. That "monitoring/persisting" program would run "on the cloud" (and probably manage some information produced by GCC e.g. on NoSQL bases). So, how should some (yet to be written) C program (some Linux daemon) be designed to be cloud-friendly? So far, I understood that it should provide some Web service, probably thru a RESTful service, so should use an HTTP server library like onion. And that OpenStack is able to start (e.g. a dozen of) such services. But I don't have a clear picture of what OpenStack brings. So far, I noticed the ability to manage (and distribute) virtual machines (with some Python API). It is less clear how can it distribute some ELF executable, how can it start it, etc. Do you have any references or examples of C / C++ programming on the cloud? How should a "cloud-friendly" (actually, OpenStack friendly) C/C++ server application be designed?

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• Making Modular, Reusable and Loosely Coupled MVC Components

  - by Dusan

  I am building MVC3 application and need some general guidelines on how to manage complex client side interaction between my components. Here is my definition of one component in general way: Component which has it's own controller, model and view. All of the component's logic is placed inside these three parts and component is sort of "standalone", it contains it's own form, data needed for interaction, updates itself with Ajax and so on. Beside this internal logic and behavior of the component, it needs to be able to "Talk" to the outside world. By this I mean it should provide data and events (sort of) so when this component gets embedded in pages can notify other components which then can update based on the current state and data. I have an idea to use client ViewModel (in java-script) which would hookup all relevant components on page and control interaction between them. This would make components reusable, modular - independent of the context in which they are used. How would you do this, I am a bit stuck as I do not know if this is a good approach and there is a technical possibility to achieve this using java-script/jquery. The confusing part is about update via Ajax, how to ensure that component is properly linked to ViewModel when component is Ajax updated (or even worse removed or dynamically added). Also, how should this ViewModel be constructed and which technicalities to use here and in components to work as synergy??? On the web, I have found the various examples of the similar approach, but they are oversimplified (even for dummies) or over specific and do not provide valuable resource or general solution for this kind of implementation. If you have some serious examples it would be, also, very helpful. Note: My aim is to make interactions between many components on the same page simpler and more robust and elegant.

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• Why after each restart, my local .NET sites take time to load for the first time?

  - by Saeed Neamati

  I'm developing sites based on .NET platform. I usually deploy these sites on my local IIS, so that I can test them and see their functionality before going live. However, each time I restart windows, it seems that sites take a long time to run for the first time. I know about JIT and I'm also aware of this question, but it doesn't answer my question. Does JIT happens every time you restart windows? Is it related to creation of w3wp.exe process? Why sites are so slow for the first request after each restart?

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• Visual Studio 2010 editor painfully slow

  - by Daniel Gehriger

  I'm running out of patience with MS VisualStudio 2010: I'm working on a solution containing ~50 C++ projects. When using the editor, I experience a lag of 1 - 2 seconds whenever I move the cursor to a different line, or when I move to a different window, or generally when the editor losses and gains focus. I went through a whole series of optimizations, to no avail: installed all hotfixes for VS2010 disabled all add-ins and extensions disabled Intellisense deleted all temporary files created by VS2010 disabled hardware acceleration unloaded all but 15 projects disabled tracking changes closed all but one window and so on. This is on a Dual Core machine with SSD harddrive (verified throughput 100MB/s), enough free space on HD, Windows 7 Pro 32-bit with 3GB of RAM and most of it still free. Whenever I type a letter, CPU usage of devenv.exe goes to 50 - 90% in process monitor for 1 - 2 seconds before returning to 5%. I used Process Explorer to analyze registry and file system access, and I only notice frequent accesses to the .sln file (which is quiet small), and a few registry reads, but nothing that would raise a red flag. I don't have this problem with solutions containing less projects, so I'm inclined to think that it's related to the number of projects. For your information, the entire solution has been migrated over the years from VS2005 to VS2008 to now VS2010. Does anyone have any ideas what else I could do to resume work on this project, other than returning to VS2008?

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