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• Why can I access private/protected methods using Object#send in Ruby?

  - by smotchkkiss

  The class class A private def foo puts :foo end public def bar puts :bar end private def zim puts :zim end protected def dib puts :dib end end instance of A a = A.new test a.foo rescue puts :fail a.bar rescue puts :fail a.zim rescue puts :fail a.dib rescue puts :fail a.gaz rescue puts :fail test output fail bar fail fail fail .send test [:foo, :bar, :zim, :dib, :gaz].each { |m| a.send(m) rescue puts :fail } .send output foo bar zim dib fail The question The section labeled "Test Output" is the expected result. So why can I access private/protected method by simply Object#send? Perhaps more important: What is the difference between public/private/protected in Ruby? When to use each? Can someone provide real world examples for private and protected usage?

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• 3 methods for adding a "Product" through Entity Framework. What's the difference?

  - by Kohan

  Reading this MSDN article titled "Working with ObjectSet (Entity Framework)" It shows two examples on how to add a Product.. one for 3.5 and another for 4.0. http://msdn.microsoft.com/en-us/library/ee473442.aspx Through my lack of knowledge I am possibly completely missing something here, but i never added a Product like this: //In .NET Framework 3.5 SP1, use the following code: (ObjectQuery) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.AddObject("Products", newProduct); } //New in .NET Framework 4, use the following code: (ObjectSet) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.Products.AddObject(newProduct); } I would not have done it either way and just used: // (My familiar way) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.AddToProducts(newProduct); } What's the difference between these three ways? Is "My way" just another way of using an ObjectQuery? Thanks, Kohan

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• Why can't I call methods within a class that explicitly implements an interface?

  - by tyrone302

  Here's the story. I created and interface, IVehicle. I explicitly implemented the interface in my class, Vehicle.cs. Here is my interface: Interface IVehicle { int getWheel(); } here is my class: class Vehicle: IVehicle { public int IVehicle.getWheel() { return wheel; } public void printWheel() { Console.WriteLine(getWheel()); } } Notice that "getWheel()" is explicitly implemented. Now, when I try to call that method within my Vehicle class, I receive an error indicating that getWheel() does not exist in the current context. Can someone help me understand what I am doing wrong?

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• Should I supress CA1062: Validate arguments of public methods?

  - by brickner

  I've recently upgraded my project to Visual Studio 2010 from Visual Studio 2008. In Visual Studio 2008, this Code Analysis rule doesn't exist. Now I'm not sure if I should use this rule or not. I'm building an open source library so it seems important to keep people safe from doing mistakes. However, if all I'm going to do is throw ArgumentNullException when the parameter is null, it seems like writing useless code since ArgumentNullException will be thrown even if I won't write that code. Should I remove that rule or fix the violations?

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• How do I set values for a class without using any setter methods?

  - by fari

  Please can anyone help me public class KalaGameState implements Cloneable { // your code goes here public KalaGameState(int startingStones) throws InvalidStartingStonesException { // your code goes here } public int getTurn() { // your code goes here } public int getKala(int playerNum) throws IllegalPlayerNumException { // your code goes here } public int getNumStones(int sidePitNum) throws IllegalSidePitNumException { // your code goes here } public int getNumStones(int playerNum, int sidePitNum) throws IllegalPlayerNumException, IllegalSidePitNumException { // your code goes here } public int getScore(int playerNum) throws IllegalPlayerNumException { // your code goes here } private int getSidePitArrayIndex(int sidePitNum) throws IllegalSidePitNumException { // your code goes here } public boolean gameOver() { // your code goes here } public void makeMove(int sidePitNum) throws IllegalSidePitNumException, IllegalMoveException { // your code goes here } }

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• mvvm-light: Should we merge Cleanup methods in locator?

  - by mark smith

  Hi there, when creating a new ViewModel within the locator class using the snippet it creates a Cleanup Method but there is already one available from the Main so hence an error.... Should we merge them all?? Or should we be renaming the method to Cleanup[Name of viewmodel] for example. I am a little confused here Another question i would like to ask is regards to the naming conventions. I tried to follow the naming convention used with "MAIN"... hence i have CreateLogin, ClearLogin, Login (non static property for binding) etc etc.. Would it not be better to use CreateLoginViewModel, ClearLoginViewModel etc?? Just curious Thanks

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• How do I imply code contracts of chained methods to avoid superfluous checks while chaining?

  - by Sandor Drieënhuizen

  I'm using Code Contracts in C# 4.0. I'm applying the usual static method chaining to simulate optional parameters (I know C# 4.0 supports optional parameters but I really don't want to use them). The thing is that my contract requirements are executed twice (or possibly the number of chained overloads I'd implement) if I call the Init(string , string[]) method -- an obvious effect from the sample source code below. This can be expensive, especially due to relatively expensive requirements like the File.Exists I use. public static void Init(string configurationPath, string[] mappingAssemblies) { // The static contract checker 'makes' me put these here as well as // in the overload below. Contract.Requires<ArgumentNullException>(configurationPath != null, "configurationPath"); Contract.Requires<ArgumentException>(configurationPath.Length > 0, "configurationPath is an empty string."); Contract.Requires<FileNotFoundException>(File.Exists(configurationPath), configurationPath); Contract.Requires<ArgumentNullException>(mappingAssemblies != null, "mappingAssemblies"); Contract.ForAll<string>(mappingAssemblies, (n) => File.Exists(n)); Init(configurationPath, mappingAssemblies, null); } public static void Init(string configurationPath, string[] mappingAssemblies, string optionalArgument) { // This is the main implementation of Init and all calls to chained // overloads end up here. Contract.Requires<ArgumentNullException>(configurationPath != null, "configurationPath"); Contract.Requires<ArgumentException>(configurationPath.Length > 0, "configurationPath is an empty string."); Contract.Requires<FileNotFoundException>(File.Exists(configurationPath), configurationPath); Contract.Requires<ArgumentNullException>(mappingAssemblies != null, "mappingAssemblies"); Contract.ForAll<string>(mappingAssemblies, (n) => File.Exists(n)); //... } If however, I remove the requirements from that method, the static checker complains that the requirements of the Init(string, string[], string) overload are not met. I reckon that the static checker doesn't understand that there requirements of the Init(string, string[], string) overload implicitly apply to the Init(string, string[]) method as well; something that would be perfectly deductable from the code IMO. This is the situation I would like to achieve: public static void Init(string configurationPath, string[] mappingAssemblies) { // I don't want to repeat the requirements here because they will always // be checked in the overload called here. Init(configurationPath, mappingAssemblies, null); } public static void Init(string configurationPath, string[] mappingAssemblies, string optionalArgument) { // This is the main implementation of Init and all calls to chained // overloads end up here. Contract.Requires<ArgumentNullException>(configurationPath != null, "configurationPath"); Contract.Requires<ArgumentException>(configurationPath.Length > 0, "configurationPath is an empty string."); Contract.Requires<FileNotFoundException>(File.Exists(configurationPath), configurationPath); Contract.Requires<ArgumentNullException>(mappingAssemblies != null, "mappingAssemblies"); Contract.ForAll<string>(mappingAssemblies, (n) => File.Exists(n)); //... } So, my question is this: is there a way to have the requirements of Init(string, string[], string) implicitly apply to Init(string, string[]) automatically?

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• Accessing Singleton Instance Variable in Class Methods Throws Warning?

  - by Ross

  Hello, I've using the Objective-C singleton from here at stackoverflow. The singleton in the class method accesses it's instance variable, which works, but throws a complie warning. How should I be doing this? Is there a way to do this without accessing the sharedInstance: in each class method? for example here is my class method: + (NSString *)myClassMethods { [instanceDateFormatter setFormat:@"MM"]; return [instanceDateFormatter stringWithDate:somedate]; } line 2 will have the complie warning. Thanks, Ross

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• How could I refactor this into more manageable methods?

  - by ChaosPandion

  private static JsonStructure Parse(string jsonText, bool throwException) { var result = default(JsonStructure); var structureStack = new Stack<JsonStructure>(); var keyStack = new Stack<string>(); var current = default(JsonStructure); var currentState = ParserState.Begin; var invalidToken = false; var key = default(string); var value = default(object); foreach (var token in Lexer.Tokenize(jsonText)) { switch (currentState) { case ParserState.Begin: switch (token.Type) { case TokenType.OpenBrace: currentState = ParserState.ObjectKey; current = result = new JsonObject(); break; case TokenType.OpenBracket: currentState = ParserState.ArrayValue; current = result = new JsonArray(); break; default: invalidToken = true; break; } break; case ParserState.ObjectKey: switch (token.Type) { case TokenType.StringLiteral: currentState = ParserState.ColonSeperator; key = (string)token.Value; break; default: invalidToken = true; break; } break; case ParserState.ColonSeperator: switch (token.Type) { case TokenType.Colon: currentState = ParserState.ObjectValue; break; default: invalidToken = true; break; } break; case ParserState.ObjectValue: case ParserState.ArrayValue: switch (token.Type) { case TokenType.NumberLiteral: case TokenType.StringLiteral: case TokenType.BooleanLiteral: case TokenType.NullLiteral: currentState = ParserState.ItemEnd; value = token.Value; break; case TokenType.OpenBrace: structureStack.Push(current); keyStack.Push(key); currentState = ParserState.ObjectKey; current = new JsonObject(); break; case TokenType.OpenBracket: structureStack.Push(current); currentState = ParserState.ArrayValue; current = new JsonArray(); break; default: invalidToken = true; break; } break; case ParserState.ItemEnd: var jsonObject = (current as JsonObject); if (jsonObject != null) { jsonObject.Add(key, value); currentState = ParserState.ObjectKey; } var jsonArray = (current as JsonArray); if (jsonArray != null) { jsonArray.Add(value); currentState = ParserState.ArrayValue; } switch (token.Type) { case TokenType.CloseBrace: case TokenType.CloseBracket: currentState = ParserState.End; break; case TokenType.Comma: break; default: invalidToken = true; break; } break; case ParserState.End: switch (token.Type) { case TokenType.CloseBrace: case TokenType.CloseBracket: case TokenType.Comma: var previous = structureStack.Pop(); var previousJsonObject = (previous as JsonObject); if (previousJsonObject != null) { currentState = ParserState.ObjectKey; previousJsonObject.Add(keyStack.Pop(), current); } var previousJsonArray = (previous as JsonArray); if (previousJsonArray != null) { currentState = ParserState.ArrayValue; previousJsonArray.Add(current); } current = previous; if (token.Type != TokenType.Comma) { currentState = ParserState.End; } break; default: invalidToken = true; break; } break; default: break; } if (invalidToken) { if (throwException) { throw new JsonException(token); } return null; } } return result; }

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• Is this a good way to expose generic base class methods through an interface?

  - by Nate Heinrich

  I am trying to provide an interface to an abstract generic base class. I want to have a method exposed on the interface that consumes the generic type, but whose implementation is ultimately handled by the classes that inherit from my abstract generic base. However I don't want the subclasses to have to downcast to work with the generic type (as they already know what the type should be). Here is a simple version of the only way I can see to get it to work at the moment. public interface IFoo { void Process(Bar_base bar); } public abstract class FooBase<T> : IFoo where T : Bar_base { abstract void Process(T bar); // Explicit IFoo Implementation void IFoo.Process(Bar_base bar) { if (bar == null) throw new ArgumentNullException(); // Downcast here in base class (less for subclasses to worry about) T downcasted_bar = bar as T; if (downcasted_bar == null) { throw new InvalidOperationException( string.Format("Expected type '{0}', not type '{1}'", T.ToString(), bar.GetType().ToString()); } //Process downcasted object. Process(downcasted_bar); } } Then subclasses of FooBase would look like this... public class Foo_impl1 : FooBase<Bar_impl1> { void override Process(Bar_impl1 bar) { //No need to downcast here! } } Obviously this won't provide me compile time Type Checking, but I think it will get the job done... Questions: 1. Will this function as I think it will? 2. Is this the best way to do this? 3. What are the issues with doing it this way? 4. Can you suggest a different approach? Thanks!

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• How can I call VC# webservice methods without ArgumentException?

  - by Zarius

  Currently, I'm trying to write a small tray application that will show the status and provide control of a server-side application exposed over webservice. The webservice only has 3 operations: start, stop and status. When I call any of these operations in code, they throw an ArgumentException citing "An item with the same key has already been added". I am compiling the webservice on Visual C# Express 2008, and .NET 3.5. The Code: private TelnetConnClient Conn { get { return new TelnetConnClient(); } } private bool Connected //call webservice operations { get { return Conn.Status(); } set { if(value) Conn.Start(); else Conn.Stop(); } } The Stacktrace: A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) at System.ServiceModel.TransactionFlowAttribute.ApplyBehavior(OperationDescription description, BindingParameterCollection parameters) at System.ServiceModel.TransactionFlowAttribute.System.ServiceModel.Description.IOperationBehavior.AddBindingParameters(OperationDescription description, BindingParameterCollection parameters) at System.ServiceModel.Description.DispatcherBuilder.AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection parameters) at System.ServiceModel.Description.DispatcherBuilder.BuildProxyBehavior(ServiceEndpoint serviceEndpoint, BindingParameterCollection& parameters) at System.ServiceModel.Channels.ServiceChannelFactory.BuildChannelFactory(ServiceEndpoint serviceEndpoint) at System.ServiceModel.ChannelFactory.CreateFactory() at System.ServiceModel.ChannelFactory.OnOpening() at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) at System.ServiceModel.ChannelFactory.EnsureOpened() at System.ServiceModel.ChannelFactory`1.CreateChannel(EndpointAddress address, Uri via) at System.ServiceModel.ChannelFactory`1.CreateChannel() at System.ServiceModel.ClientBase`1.CreateChannel() at System.ServiceModel.ClientBase`1.CreateChannelInternal() at System.ServiceModel.ClientBase`1.get_Channel() at KordiaConnect.ferries.TelnetConnClient.Start() in C:\My Dropbox\Coding\RTF\KordiaConnect\KordiaConnect\Service References\ferries\Reference.cs:line 86 at coldshark.ferries.Main.set_Connected(Boolean value) in C:\My Dropbox\Coding\RTF\KordiaConnect\KordiaConnect\Main.cs:line 22 at coldshark.ferries.Main.<.ctor>b__0(Object sender, EventArgs e) in C:\My Dropbox\Coding\RTF\KordiaConnect\KordiaConnect\Main.cs:line 43 at System.Windows.Forms.NotifyIcon.OnClick(EventArgs e) at System.Windows.Forms.NotifyIcon.WmMouseUp(Message& m, MouseButtons button) at System.Windows.Forms.NotifyIcon.WndProc(Message& msg) at System.Windows.Forms.NotifyIcon.NotifyIconNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.PeekMessage(MSG& msg, HandleRef hwnd, Int32 msgMin, Int32 msgMax, Int32 remove) at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run() at coldshark.ferries.Main..ctor() in C:\My Dropbox\Coding\RTF\KordiaConnect\KordiaConnect\Main.cs:line 55 I can just call the webservice from the web interface, but this application will give me a handy status notification icon, and I'd really love to know why the out-of-the-box auto-generated code fails for no particular reason.

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• C# - Angle between two 2d vectors, diff between two methods?

  - by Sean Ochoa

  Hey all. I've got this code snippet, and I'm wondering why the results of the first method differ from the results of the second method, given the same input? public double AngleBetween_1(vector a, vector b) { var dotProd = a.Dot(b); var lenProd = Len*b.Len; var divOperation = dotProd/lenProd; return Math.Acos(divOperation) * (180.0 / Math.PI); } public double AngleBetween_2(vector a, vector b) { var dotProd = a.Dot(b); var lenProd = Len*b.Len; var divOperation = dotProd/lenProd; return (1/Math.Cos(divOperation)) * (180.0 / Math.PI); }

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• How do people prove the correctness of Computer Vision methods?

  - by solvingPuzzles

  I'd like to pose a few abstract questions about computer vision research. I haven't quite been able to answer these questions by searching the web and reading papers. How does someone know whether a computer vision algorithm is correct? How do we define "correct" in the context of computer vision? Do formal proofs play a role in understanding the correctness of computer vision algorithms? A bit of background: I'm about to start my PhD in Computer Science. I enjoy designing fast parallel algorithms and proving the correctness of these algorithms. I've also used OpenCV from some class projects, though I don't have much formal training in computer vision. I've been approached by a potential thesis advisor who works on designing faster and more scalable algorithms for computer vision (e.g. fast image segmentation). I'm trying to understand the common practices in solving computer vision problems.

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• Is it possible to utilize internal methods on controllers to reduce duplication?

  - by Maslow

  in a partial view I have the following: <%Html.RenderAction(MVC.User.GetComments(Model.UserGroupName)); %> can I render a Controller's PartialViewResult in a View without going through routing so I can pass arguments directly from the model so that the arguments I'm passing to the controller never get sent to the user or seen by the user? Currently the method I'm showing at the top throws an exception because no overload is public. I've got it marked as internal so that a user can not access it, only the rendering engine was my intent.

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• Can you declare <canvas> methods within a template in javascript?

  - by Binarytales

  Not entirely sure I posed the question in the best way but here goes... I have been playing around with the HTML5 canvas API and have got as far as drawing a shape in the canvas and getting it to move around with the arrow keys. I then tried to move my various variables and functions to a template so I could spawn multiple shapes (that would eventually be controlled by different keys). This is what I have: function player(x, y, z, colour, speed){ this.lx = x; this.ly = y; this.speed = 10; this.playerSize = z; this.colour = colour; } playerOne = new player(100, 100, 10, "#F0F"); function persona(z, colour){ zone.fillStyle = colour; offset = 0 - (z / 2); zone.fillRect(offset, offset, z, z); } function move(x, y){ playerOne.lx = playerOne.lx + x; playerOne.ly = playerOne.ly + y; zone.clearRect(0, 0, 500, 500); zone.save(); zone.translate(playerOne.lx, playerOne.ly); persona(playerOne.playerSize, playerOne.colour); zone.restore(); } window.onkeydown = function() { var direction = this.event.keyCode; var s = playerOne.speed; // Arrow Keys if( direction == 38 && playerOne.ly >= 10){ // Up move(0,-s); } if( direction == 40 && playerOne.ly <= 490){ // Down move(0,s); } if( direction == 37 && playerOne.lx >= 10){ // Left move(-s,0); } if( direction == 39 && playerOne.lx <= 490){ // Right move(s,0); } }; window.onload = function() { zone = document.getElementById('canvas').getContext('2d'); zone.save(); zone.translate(playerOne.lx, playerOne.ly); persona(playerOne.playerSize, playerOne.colour); zone.restore(); }; So what I tried to do was move the persona function into the player template like this: function player(x, y, z, colour, speed){ this.lx = x; this.ly = y; this.speed = 10; function persona(){ zone.fillStyle = colour; var offset = 0 - (z / 2); zone.fillRect(offset, offset, z, z); } } And then where before it said persona(playerOne.playerSize, playerOne.colour); it now just says playerOne.persona(); But this is just totally flaking out and not working and I can't figure out why. I'm probably going about it all the wrong way and I think the problem is that I'm trying to manipulate the canvas.context (call zone in my script) from within a object/template. Perhaps its nothing to do with that at all and I an just not declaring my persona functions properly in the context of the template. Documentation for the canvas API is very thin on the ground and any hint in the right direction will be very much appreciated.

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• When should I use Dependency Injection and when utility methods?

  - by Roman

  I have a Java EE project with Spring IoC container. I've just found in Utils class static method sendMail(long list of params). I don't know why but I feel that it would look better if we had separate class (Spring bean with singleton scope) which will be responsible for sending email. But I can't find any arguments which can prove my position. So, are there any pros (or cons) in using DI in this (rather general) situation?

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• My abstract class implements an interface but doesn't implement some of its methods. How do I make i

  - by Stefan Monov

  interface ICanvasTool { void Motion(Point newLocation); void Tick(); } abstract class CanvasTool_BaseDraw : ICanvasTool { protected abstract void PaintAt(Point location); public override void Motion(Point newLocation) { // implementation } } class CanvasTool_Spray : CanvasTool_BaseDraw { protected abstract void PaintAt(Point location) { // implementation } public override void Tick() { // implementation } } This doesn't compile. I could add an abstract method "Tick_Implementation" to CanvasTool_BaseDraw, then implement ICanvasTool.Tick in CanvasTool_BaseDraw with a one-liner that just calls Tick_Implementation. Is this the recommended workaround?

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• Best practice Unit testing abstract classes?

  - by Paul Whelan

  Hello I was wondering what the best practice is for unit testing abstract classes and classes that extend abstract classes. Should I test the abstract class by extending it and stubbing out the abstract methods and then test all the concrete methods? Then only test the methods I override and the abstract methods in the unit tests for objects that extend my abstract class. Should I have an abstract test case that can be used to test the methods of the abstract class and extend this class in my test case for objects that extend the abstract class? EDIT: My abstract class has some concrete methods. I would be interested to see what people are using. Thanks Paul

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• Delphi 5: Ideas for simulating "Obsolete" or "Deprecated" methods?

  - by Ian Boyd

  i want to mark a method as obsolete, but Delphi 5 doesn't have such a feature. For the sake of an example, here is a made-up method with it's deprecated and new preferred form: procedure TStormPeaksQuest.BlowHodirsHorn; overload; //obsolete procedure TStormPeaksQuest.BlowHodirsHorn(UseProtection: Boolean); overload; Note: For this hypothetical example, we assume that using the parameterless version is just plain bad. There are problems with not "using protection" - which have no good solution. Nobody likes having to use protection, but nobody wants to not use protection. So we make the caller decide if they want to use protection or not when blowing Hodir's horn. If we default the parameterless version to continue not using protection: procedure TStormPeaksQuest.BlowHodirsHorn; begin BlowHodirsHorn(False); //No protection. Bad! end; then the developer is at risk of all kinds of nasty stuff. If we force the parameterless version to use protection: procedure TStormPeaksQuest.BlowHodirsHorn; begin BlowHodirsHorn(True); //Use protection; crash if there isn't any end; then there's a potential for problems if the developer didn't get any protection, or doesn't own any. Now i could rename the obsolete method: procedure TStormPeaksQuest.BlowHodirsHorn_Deprecatedd; overload; //obsolete procedure TStormPeaksQuest.BlowHodirsHorn(UseProtection: Boolean); overload; But that will cause a compile error, and people will bitch at me (and i really don't want to hear their whining). i want them to get a nag, rather than an actual error. i thought about adding an assertion: procedure TStormPeaksQuest.BlowHodirsHorn; //obsolete begin Assert(false, 'TStormPeaksQuest.BlowHodirsHorn is deprecated. Use BlowHodirsHorn(Boolean)'); ... end; But i cannot guarantee that the developer won't ship a version without assertions, causing a nasty crash for the customer. i thought about using only throwing an assertion if the developer is debugging: procedure TStormPeaksQuest.BlowHodirsHorn; //obsolete begin if DebugHook > 0 then Assert(false, 'TStormPeaksQuest.BlowHodirsHorn is deprecated. Use BlowHodirsHorn(Boolean)'); ... end; But i really don't want to be causing a crash at all. i thought of showing a MessageDlg if they're in the debugger (which is a technique i've done in the past): procedure TStormPeaksQuest.BlowHodirsHorn; //obsolete begin if DebugHook > 0 then MessageDlg('TStormPeaksQuest.BlowHodirsHorn is deprecated. Use BlowHodirsHorn(Boolean)', mtWarning, [mbOk], 0); ... end; but that is still too disruptive. And it has caused problems where the code is stuck at showing a modal dialog, but the dialog box wasn't obviously visible. i was hoping for some sort of warning message that will sit there nagging them - until they gouge their eyes out and finally change their code. i thought perhaps if i added an unused variable: procedure TStormPeaksQuest.BlowHodirsHorn; //obsolete var ThisMethodIsObsolete: Boolean; begin ... end; i was hoping this would cause a hint only if someone referenced the code. But Delphi shows a hint even if you don't call actually use the obsolete method. Can anyone think of anything else?

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• Can can I reference extended methods/params without having to cast from the base class object return

  - by Greg

  Hi, Is there away to not have a "cast" the top.First().Value() return to "Node", but rather have it automatically assume this (as opposed to NodeBase), so I then see extended attributes for the class I define in Node? That is is there a way to say: top.Nodes.First().Value.Path; as opposed to now having to go: ((Node)top.Nodes.First().Value).Path) thanks [TestMethod()] public void CreateNoteTest() { var top = new Topology(); Node node = top.CreateNode("a"); node.Path = "testpath"; Assert.AreEqual("testpath", ((Node)top.Nodes.First().Value).Path); // *** HERE *** } class Topology : TopologyBase<string, Node, Relationship> { } class Node : NodeBase<string> { public string Path { get; set; } } public class NodeBase<T> { public T Key { get; set; } public NodeBase() { } public NodeBase(T key) { Key = key; } } public class TopologyBase<TKey, TNode, TRelationship> where TNode : NodeBase<TKey>, new() where TRelationship : RelationshipBase<TKey>, new() { // Properties public Dictionary<TKey, NodeBase<TKey>> Nodes { get; private set; } public List<RelationshipBase<TKey>> Relationships { get; private set; } }

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• How to have member variables and public methods in a jQuery plugin?

  - by user169867

  I'm trying to create a jQuery plugin that will create something like an autoCompleteBox but with custom features. How do I store member variables for each matching jQuery element? For example I'll need to store a timerID for each. I'd also like to store references to some of the DOM elements that make up the control. I'd like to be able to make a public method that works something like: $("#myCtrl").autoCompleteEx.addItem("1"); But in the implementation of addItem() how can I access the member variables for that particular object like its timerID or whatever? Below is what I have so far... Thanks for any help or suggestions! (function($) { //Attach this new method to jQuery $.fn.autoCompleteEx = function(options) { //Merge Given Options W/ Defaults, But Don't Alter Either var opts = $.extend({}, $.fn.autoCompleteEx.defaults, options); //Iterate over the current set of matched elements return this.each(function() { var acx = $(this); //Get JQuery Version Of Element (Should Be Div) //Give Div Correct Class & Add <ul> w/ input item to it acx.addClass("autoCompleteEx"); acx.html("<ul><li class=\"input\"><input type=\"text\"/></li></ul>"); //Grab Input As JQ Object var input = $("input", acx); //Wireup Div acx.click(function() { input.focus().val( input.val() ); }); //Wireup Input input.keydown(function(e) { var kc = e.keyCode; if(kc == 13) //Enter { } else if(kc == 27) //Esc { } else { //Resize TextArea To Input var width = 50 + (_txtArea.val().length*10); _txtArea.css("width", width+"px"); } }); }); //End Each JQ Element }; //End autoCompleteEx() //Private Functions function junk() { }; //Public Functions $.fn.autoCompleteEx.addItem = function(id,txt) { var x = this; var y = 0; }; //Default Settings $.fn.autoCompleteEx.defaults = { minChars: 2, delay: 300, maxItems: 1 }; //End Of Closure })(jQuery);

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• What are the Jena methods used to access an ontology?

  - by amoosh

  Hello I'm new to ontologies, my assignment is to create an ontology using Protege V4.0.2, (which I've done) and to create a website over that ontology(which I'm working on), i just need the basics on how to search the ontology using the Jena library I dont have any specifics because i haven't yet started. but i'm in a time crunch, and i need to now exactly how i'm goning to do it

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• Methods and properties in scheme - is object oriented programming possible in scheme?

  - by incrediman

  I will use a simple example to illustrate my question. In Java, C, or any other OOP language, I could create a pie class in a way similar to this: class Apple{ public String flavor; public int pieces; private int tastiness; public goodness(){ return tastiness*pieces; } } What's the best way to do that with Scheme? I suppose I could do with something like this: (define make-pie (lambda (flavor pieces tastiness) (list flavor pieces tastiness))) (define pie-goodness (lambda (pie) (* (list-ref pie 1) (list-ref pie 2)))) (pie-goodness (make-pie 'cherry 2 5)) ;output: 10 ...where cherry is the flavor, 2 is the pieces, and 5 is the tastiness. However then there's no type-safety or visibility, and everything's just shoved in an unlabeled list. How can I improve that? Sidenote: The make-pie procedure expects 3 arguments. If I want to make some of them optional (like I'd be able to in curly-brace languages like Java or C), is it good practice to just take the arguments in as a list (that is treat the arguments as a list - not require one argument which is a list) and deal with them that way?

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• Is there a Rails authentication library which separates users from login methods?

  - by Gareth

  In my mental model of authentication, a user should be distinct from the way they log in. So for example, a User could have an associated EmailLogin (with an email/password), or they could have many (or none). Similarly they could have 0..* associated OpenIDLogin credentials. Are there any existing authentication libraries for Rails which use this method? Alternatively, is this a really terrible idea?

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• Is there any Java Decompiler that can correctly decompile calls to overloaded methods?

  - by mihi

  Consider this (IMHO simple) example: public class DecompilerTest { public static void main(String[] args) { Object s1 = "The", s2 = "answer"; doPrint((Object) "You should know:"); for (int i = 0; i < 2; i++) { doPrint(s1); doPrint(s2); s1 = "is"; s2 = new Integer(42); } System.out.println(); } private static void doPrint(String s1) { System.out.print("Wrong!"); } private static void doPrint(Object s1) { System.out.print(s1 + " "); } } Compile it with source/target level 1.1 without debug information (i.e. no local variable information should be present) and try to decompile it. I tried Jad, JD-GUI and Fernflower, and all of them got at least one of the call wrong (i. e. the program printed "Wrong!" at least once) Is there really no java decompiler that can infer the right casts so that it will not call the wrong overload?

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