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• How is this "interface"-like structure/pattern called?

  - by Sebastian Negraszus

  Let's assume we have an XmlDoc class that contains basic functionality for dealing with an XML data structure and saving/loading data to/from a file. Now we have several subclasses, A, B and C. They all inherit from XmlDoc and add component-specific methods for setting and getting lots of data. They are like "interfaces" but also add an implementation for the signatures. Finally, we have an ABCDoc class that joins all the "interfaces" via virtual multiple inheritence and adds some ABCDoc-specific stuff, such as using XMLDoc-methods to set an appropriate doc type. We may also have an ADoc class for only saving A data. How is this pattern called? "Interface" is not really the right word since interfaces usually do not contain an implementation. Bonus points for C++ code conventions.

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• Cocos2d iOS A* Star Path finding help

  - by user32581

  Hello I need help implementing this class https://github.com/sqlboy/tiled-games/tree/master/src into my iOS game. Im using the suggested code of: AStarPathFinder pathFinder = [[AStarPathFinder alloc] initWithTileMap:tileMap collideLayer:@"collide"]; // Optionally, you can set the name of the collide property key and the value it expects. [pathFinder setCollideKey:@"collidable"] // defaults to COLLIDE [pathFinder setCollideValue:@"True"] // defaults to 1 // highlight a path (src and dst are tile coorindates) [pathFinder highlightPathFrom:srcTile to:dstTile]; // move a sprite [pathFinder moveSprite:player from:srcTile to:dstTile atSpeed:0.1f]; I get the following error: Instance method '-initWithTileMap:collideLayer:' not found (return defaults to 'id') This is the official post for the class: http://www.cocos2d-iphone.org/forums/topic/just-pushed-a-cctmxtiledmap-a-pathfinding-class-to-github/ The only other code I added was: #import "AStarPathFinder.h" I think I am perhaps missing something! I am grateful for any help!

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• Trying to launch old game using wine

  - by rhon

  I'm using wine 1.5.11 on Archlinux, and I try to launch this old game : http://www.cnetfrance.fr/telecharger/waterboy-11006056s.htm?download=1 The problem is that I always get a "Run-time error '13' : Type mismatch" when I try to launch it. I've tried to switch oleaut.dll and ole32.dll to "native", and switch to "Windows 98" mode using winecfg, and then I had this error : err:module:import_dll Library ole32.dll (which is needed by L"Z:\\games\\WaterBoy\\MSVBVM50.DLL") not found err:module:import_dll Library OLEAUT32.dll (which is needed by L"Z:\\games\\WaterBoy\\MSVBVM50.DLL") not found err:module:import_dll Library MSVBVM50.DLL (which is needed by L"Z:\\games\\WaterBoy\\WaterBoy.exe") not found err:module:LdrInitializeThunk Main exe initialization for L"Z:\\games\\WaterBoy\\WaterBoy.exe" failed, status c0000135 I've installed vb5runtime using winetricks, but it didn't help. Am I doing something wrong ?

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• Where Are Multiple JUnit Test Methods Typically Placed in Code?

  - by Thunderforge

  I've just read the Vogella JUnit tutorial and found it very helpful in understanding how to use JUnit. However, I'm a bit confused about what the convention is for placing multiple test methods in code. The tutorial only places one test method in a class, then describes how you can use a test suite to group multiple test classes together. Does this mean that it's common practice for each test class to only have one test method and then test suites are used to chain them together? Or was that just unintended and instead common practice is to put multiple test methods in a class?

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• La première version du SDK de Dart sort, le langage structuré pour le Web de Google est prêt à l'emploi

  Dartium : Google publie une préversion de Chrome avec la machine virtuelle Dart son langage structuré pour le Web Mise à jour du 17/02/2012, par Hinault Romaric Google vient de publier une préversion ( technical preview) pour les développeurs de Dartium, un navigateur à base de Chrome qui introduit la machine virtuelle Dart. Dart est présenté par Google comme un langage de programmation structuré pour le Web, basé sur les classes et optionnellement typé. L'objectif inavoué de Google est de mettre JavaScript à la retraite en proposant un langage qui offre la même flexibilité que celui-ci, mais qui se distingue par son typage fort et opti...

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• Is this a violation of the Liskov Substitution Principle?

  - by Paul T Davies

  Say we have a list of Task entities, and a ProjectTask sub type. Tasks can be closed at any time, except ProjectTasks which cannot be closed once they have a status of Started. The UI should ensure the option to close a started ProjectTask is never available, but some safeguards are present in the domain: public class Task { public Status Status { get; set; } public virtual void Close() { Status = Status.Closed; } } public ProjectTask : Task { public override void Close() { if (Status == Status.Started) throw new Exception("Cannot close a started Project Task"); base.Close(); } } Now when calling Close() on a Task, there is a chance the call will fail if it is a ProjectTask with the started status, when it wouldn't if it was a base Task. But this is the business requirements. It should fail. Can this be regarded as a violation?

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• Workflow of sharing code for small teams

  - by Mihalis Bagos

  Problem is, we have developed a small CMS, that is different per implementation (currently). Of course development of this is never complete. Sometimes, we are working on more than one project that implements it (by copying-pasting the code files of the CMS to each project), and we add a new feature that we want to share on other projects as well (these can be small ones too, ie a custom ajax JSON controller - we use MVC) What we want to do is quickly and uniformly share the code with all other projects, via a version control system (or something similar), and generally organize the workflow as we know this isn't a very good workflow that we have. What would you suggest? Also, at the momment, the software we use is Visual Studio 2010, so we are strongly considering TFS, but even if we get it we still don't know the ideal workflow, or even if TFS supports what we want to do. Edit: Also note, we have specific implementations that have modifications over the CMS base that we want to KEEP only in the project area. (ie: a specific feature that we DONT want to share with the base CMS code)

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• Classless tables possible with Datamapper?

  - by barerd

  I have an Item class with the following attributes: itemId,name,weight,volume,price,required_skills,required_items. Since the last two attributes are going to be multivalued, I removed them and create new schemes like: itemID,required_skill (itemID is foreign key, itemID and required_skill is primary key.) Now, I'm confused how to create/use this new table. Here are the options that came to my mind: 1) The relationship between Items and Required_skills is one-to-many, so I may create a RequiredSkill class, which belongs_to Item, which in turn has n RequiredSkills. Then I can do Item.get(1).requiredskills. This sounds most logical to me. 2) Since required_skills may well be thought of as constants (since they resemble rules), I may put them into a hash or gdbm database or another sql table and query from there, which I don't prefer. My question is: is there sth like a modelless table in datamapper, where datamapper is responsible from the creation and integrity of the table and allows me to query it in datamapper way, but does not require a class, like I may do it in sql?

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• Is it better to use preprocessor directive or if(constant) statement?

  - by MByD

  Let's say we have a codebase that is used for many different costumer, and we have some code in it that relevant only for costumers of type X. Is it better to use preprocessor directives to include this code only in costumer of type X, or to use if statement, to be more clear: // some code #if TYPE_X_COSTUMER = 1 // do some things #endif // rest of the code or if(TYPE_X_COSTUMER) { // do some things } The arguments I can think about are: Preprocessor directive results in smaller code footprint and less branches (on non-optimizing compilers) If statements results with code that always compiles, e.g. if someone will make a mistake that will harm the irrelevant code for the project he works on, the error will still appear, and he will not corrupt the code base. Otherwise he will not be aware of the corruption. I was always been told to prefer the usage of the processor over the usage of the preprocessor (If this is an argument at all...) What is preferable - when talking about a code base for many different costumers?

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• Is there a better way to handle data abstraction in this example?

  - by sigil

  I'm building an application that retrieves Sharepoint list data via a web service SPlists.Lists. To create an instance of the web service, I have the following class: class SharepointServiceCreator { public SPlists.Lists createService() { listsService.Url = "http://wss/sites/SPLists/_vti_bin/lists.asmx"; listsService.Credentials = System.Net.CredentialCache.DefaultCredentials; SPlists.Lists listsService=new SPlists.Lists(); } } I'm concerned that this isn't good OOP abstraction, though, because in order to create this service elsewhere in my application, I would need the following code: class someClass { public void someMethod() { SharepointServiceCreator s=new SharepointServiceCreator() SPlists.Lists listService=s.createService() } } Having to use declare the instance of listService in someMethod as type SPlists.Lists seems wrong, because it means that someClass needs to know about how SharepointServiceCreator is implemented. Or is this ok?

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• Instantiating Interfaces in C#?

  - by RealityDysfunction

  I am reading/learning about interfaces in C# at the moment, and thus far I managed to understand how it differs from an abstract class. In the book I am reading the author explains that interfaces are the ultimate abstract class and that it simply sets the standard of certain methods the inheriting class will have, but then provides the following example... static void Main(string[] args) { ... Circle c = new Circle("Lisa"); IPointy itPt = null; try { itPt = (IPointy)c; Console.WriteLine.(itPt.Points); } catch (InvalidCastException e) { Console.WriteLine(e.Message); } ... } The line that absolutely throws me off is the "IPointy itfPt=null;" did he just declare an interface??? I thought interfaces are abstract and can only be inherited? What kind of sorcery is going on here? Thanks for any help, I

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• using static methods and classes

  - by vedant1811

  I know that static methods/variables are associated with the class and not the objects of the class and are useful in situations when we need to keep count of, say the number of objects of the class that were created. Non-static members on the other hand may need to work on the specific object (i.e. to use the variables initialized by the constructor) My question what should we do when we need neither of the functionalities? Say I just need a utility function that accepts value(s) and returns a value besed solely on the values passed. I want to know whether such methods should be static or not. How is programming efficiency affected and which is a better coding practice/convention and why. PS: I don't want to spark off a debate, I just want a subjective answer and/or references.

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• Identifying methods with a specified Id in D [migrated]

  - by Ekyo777

  I want to have specific methods with a specific pattern recognized at compile time and registered along with a specified id trough mixins in a parent class. ex.: take a method 'X' from a class with a predetermined id:5, what I want is that, in a mixin in a parent class, method X will be registered as a delegate with its id to be called later on by its id. What would be the best way to specify the Id considering I want the id to be of type int and only the specified methods to be registered? should I (if it is even possible) do it with a custom annotation pretty much like the @property but with an argument, like: @autoregister(id) void method(...) if it is possible to do it this way, an example or a link to the documentation on how to do it would be nice since I didn't find it in the documentation.

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• How compilers know about other classes and their properties?

  - by OnResolve

  I'm writing my first programming language that is object orientated and so far so good with create a single 'class'. But, let's say I want to have to classes, say ClassA and ClassB. Provided these two have nothing to do with each other then all is good. However, say ClassA creates a ClassB--this poses 2 related questions: -How would the compiler know when compiling ClassA that ClassB even exists, and, if it does, how does it know it's properties? My thoughts thus far had been: instead of compiling each class at a time (i.e scan, parse and generate code) each "file (not really file, per se, but a "class") do I need to scan + parse each first, then generate code for all?

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• Le Web bientôt doté d'un nouveau langage ? CAS s'inspire du CSS pour proposer une définition des attributs des balises HTML dans une feuille

  Le Web bientôt doté d'un nouveau langage ? CAS s'inspire du CSS pour proposer une définition des attributs des balises HTML dans une feuille Tab Atkins Jr, un représentant de Google au sein du W3C (World Wide Web Consortium) vient de proposer à l'organisme un nouveau langage de script pour normalisation. Le langage CAS pour Cascading Attribute Sheets s'inspire grandement du CSS (Cascading Style Sheets), à la différence qu'il est basé sur un concept d'attributs HTML. L'idée de base autour de ce nouveau langage est que tout comme avec le CSS, les développeurs pourront définir dans un fichier des attributs pour les balises HTML, qui seront directement appliqués à l'ensemble ...

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• Can't open display: :0

  - by empec

  I'm trying to get Nexus Mod Manager (Beta yet) working on wine, but after the configuration of NMM it crashes with an error. During the startup it spams alot of terminal stuff and at the end I find this error. ###!!! ABORT: Main-thread-only object used off the main thread: file /build/wine-mozilla-1.8/xpcom/base/nsCycleCollector.cpp, line 1166 ###!!! ABORT: Main-thread-only object used off the main thread: file /build/wine-mozilla-1.8/xpcom/base/nsCycleCollector.cpp, line 1166 Maximum number of clients reachederr:winediag:x11drv_init_thread_data x11drv: Can't open display: :0. Please ensure that your X server is running and that $DISPLAY is set correctly. Any suggestions? Thanks!

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• RPG Equipped Item System

  - by Jimmt

  I'm making a 2d rpg with libgdx and java. I have an Inventory class with an Array of Items, and now I want to be able to equip items onto the player. Would it be more managable to do have every item have an "equipped" boolean flag have an "equipped" array in the player class have individual equipped fields in player class, e.g. private Item equippedWeapon; private Item equippedArmor; public void equipWeapon(Item weapon){ equippedWeapon = weapon; } Or just another way completely? Thanks.

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• Make Network Security Policies Successful

  Three tips on how to better engage your user base in information and network security protocols.

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• How to create a Request Specific Thread Safe Static int Counter?

  - by user960567

  In one of my server application I have a class that look like, class A { static int _value = 0; void DoSomething() { // a request start here _value = 0; _value++; // a request end here } // This method can be called many time during request void SomeAsyncMethods() { _value++; } } The problem is SomeAsyncMethods is async. Can be called many times. What I need when a request start set _value = 0 and then asynchrosnously increment this. After end of request I need the total. But the problem is that another request at the same time can access the class.

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• @OnStart & @OnStop

  - by Geertjan

  In applications based on NetBeans Platform 7.2, you'll be able to replace all your ModuleInstall classes with this code: import org.openide.modules.OnStart; import org.openide.modules.OnStop; @OnStart public final class Installer implements Runnable { @Override public void run() { System.out.println("enable something..."); } @OnStop public static final class Down implements Runnable { @Override public void run() { System.out.println("disable something..."); } } } Build the module and the annotations result in named services, thanks to @NamedServiceDefinition: Aside from no longer needing to register the ModuleInstall class in the manifest, performance of startup will be enhanced, if you use the above approach: https://netbeans.org/bugzilla/show_bug.cgi?id=200636

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• Samsung équipera un tiers de ses nouveaux smartphones avec Bada, quels seront les plus de cet OS mob

  Samsung équipera un tiers de ses nouveaux smartphones avec Bada, quels seront les plus de cet OS mobile basé sur Linux ? Samsung est le numéro deux mondial des mobiles, pour autant, le coréen reste très à la traine sur le marché des terminaux intelligents (seulement 8% des parts de marché en France en 2009). Le système d'exploitation maison de la firme, Bada, est vu par ses créateurs comme la botte secrète qui permettra d'investir le secteur des smartphones. Actuellement, un seul modèle (le Wave) en est équipé. Mais le constructeur promet une multiplication de la présence de Bada, en annonçant qu'un tiers des appareils qu'il lancera cette année en seront équipés. L'OS de Samsung est ouvert et basé sur ...

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• Java Extends value not updating

  - by James116

  I am currently working on a hibernate project(EJB and JSF), and i have multiple java classes. The data of parent is being change in the front end with JSF, however, it is not updating in the child class. Any idea as to what could be causing this? This is what i was doing. public class parent{ private String x = "UNKNOWN"; //Getters and setters public getX(){ } } public class child extends parent{ public string y{ //this is return UNKNOWN //instead of the new value being change by the user System.out.print(getX()); } } Thanks in advance

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• System.getProperty("user.dir") cannot get my project root path ,but the path which my eclipse is located

  - by facebook-100005613813158

  As the title goes , I have class named GetException.java,inside it ,I read a xml file in a static code block like(Because this document is shared): static{ ... document = db.parse(new File(System.getProperty("user.dir")+"/src/exception/ExceptionCode.xml")); ... } To test if the file path is correct, I write a main function just inside GetException.java, it proves that the path is correct ,xml file can be read successfully. My project root dir is "/home/wuchang/workspace/MongodbI". But When this Class is loaded from other class,such as I called one of its static functions , it reports the error message: /home/mrs/??/eclipse/src/exception/ExceptionCode.xml (No such file or directory) /home/mrs/??/eclipse/ is actually my eclipse installation directory.So , I wander how System.getProperty("user.dir") returned the eclipse installation directory to me ,instead of my project root directory?

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• Where can I get the 11.04 kernel .config file?

  - by Oli

  I'm using Maverick with the latest available kernels on kernel.org and building them myself. Until now I've been basing my configuration off the stock Maverick kernel and accepting the make oldconfig defaults. I've been doing this for 3 major releases now so I figure I'm starting to slip behind the current "standard". I would like to re-base my kernels off the new Natty .config file. Is this available somewhere online or do I have to download the whole kernel package and extract it? Edit: I've manually pulled in the config from the latest Natty kernel package and I can confirm that I propbably should have done this sooner. A lot of differences between my old "evolved" config and the Natty default. Now if I could just do this without 20 minutes of hunting and downloading the package so I can re-base in the future.

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• why my unit testing taken more than normal time to run in VS 2010 Premium [on hold]

  - by kombo

  I have only 4 proeject in my solutions. Am trying to run a unit test for one of my class in one of the project. I Create the unit test by: Right clicking on the class choose the create unit test option. I followed the wizard to the end.which resulting the test creation. I just pass the values of the parameter and run the test. but my test keep running. Both surprisingly it runs on other developers pc. NB:My class is connecting to the database and my application is asp.net web form. i know this is not recommended but i want to have my test running now. i have tried alot of samples on the internet but still my problem persist. Could any one tell me the cause of the extreme slowness(more than 30 minutes)

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