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  • Marking "example usage" in code documentation

    - by Ross
    What the best practice of placing example usage in code documentation? Is there a standardised way? With an @usage or @notes? For example: /** * My Function * @param object id anObject * @usage a code example here... */ function foo(id) { } or /** * My Function * @param object id anObject * @notes a code example here, maybe? */ function foo(id) { } I know this question should dependent on the documentation generator, but any heads up appreciated... I'm trying to get into the habit of using proper style. When time allow I'll get more into the generators. (I've experimented with Doxygen.) I often use AS3, JS, Obj-C, C++. Thanks

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  • show() doesn't redraw anymore

    - by Abruzzo Forte e Gentile
    Hi All I am working in linux and I don't know why using python and matplotlib commands draws me only once the chart I want. The first time I call show() the plot is drawn, wihtout any problem, but not the second time and the following. I close the window showing the chart between the two calls. Do you know why and hot to fix it? Thanks AFG from numpy import * from pylab import * data = array( [ 1,2,3,4,5] ) plot(data) [<matplotlib.lines.Line2D object at 0x90c98ac>] show() # this call shows me a plot #..now I close the window... data = array( [ 1,2,3,4,5,6] ) plot(data) [<matplotlib.lines.Line2D object at 0x92dafec>] show() # this one doesn't shows me anything

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  • [dynamic] Different behaviours between .NET 4.0 beta 2 and last release of .NET 4.0 !

    - by yogi4ever
    Hi. I've identified a difference of DLR between .NET 4.0 Beta 2 and the last release of .NET 4.0. In .NET 4.0 Beta 2, this code perfectly works at runtime : var dateTimeList = new List(); dynamic myDynamicObject = dateTimeList; object value = DateTime.Now; myDynamicObject.Add(value); Now, with last release of .NET 4.0, I have an exception at run time (to solve myDynamicObject.Add(value);) :-( In my real code, 'myDynamicObject' is a dynamic (but I know that it is always an ObservableCollection where T can be anything). 'value' is an instance which was got by some reflexions. As 'value' can have any type, the type of 'value' is Object. Do you see how can I solve this new limitation of .NET 4.0 ? Thanks

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  • PropertyInfo.GetValue() - how do you index into a generic parameter using reflection in C#?

    - by flesh
    This (shortened) code.. for (int i = 0; i < count; i++) { object obj = propertyInfo.GetValue(Tcurrent, new object[] { i }); } .. is throwing a 'TargetParameterCountException : Parameter count mismatch' exception. The underlying type of 'propertyInfo' is a Collection of some T. 'count' is the number of items in the collection. I need to iterate through the collection and perform an operation on obj. Advice appreciated.

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  • Why is this NaN to javascript?

    - by MJB
    I have this object printed with console.log Array[1] 0: Object address: "blablabalbala" datatype: "Location" icon: "cafetaria" id: "/mensa/wo_mensa1_turm.std.php" kind: "Mensa" lat: 50.777016 lon: 6.080348 sortkey: "zeltmensa, forum cafete" stationId: "/mensa/wo_mensa1_turm.std.php" title: "Zeltmensa, Forum Cafete" type: "Mensa" But console.log("nav to: "+data[0].lat+" "+data[0].lon); gives me undefined undefined, and at another point NaN NaN.. I don't understand this. It also doesn't let me use any other attributes like data[0].addresse, which returns undefined aswell. Thanks for help.

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  • C++ : Swapping template class elements of different types?

    - by metamemetics
    template< class T1, class T2 > class Pair { T1 first; T2 second; }; I'm being asked to write a swap() method so that the first element becomes the second and the second the first. I have: Pair<T2,T1> swap() { return Pair<T2,T1>(second, first); } But this returns a new object rather than swapping, where I think it needs to be a void method that changes its own data members. Is this possible to do since T1 and T2 are potentially different class types? In other words I can't simply set temp=first, first=second, second=temp because it would try to convert them to different types. I'm not sure why you would potentially want to have a template object that changes order of its types as it seems that would cause confusion but that appears to be what I'm being asked to do.

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  • Why isn't it possible to update an ObservableCollection from a different thread?

    - by MainMa
    In a multi-threaded WPF application, it is not possible to update an ObservableCollection from a thread other than WPF window thread. I know there are workarounds, so my question is not how to avoid the "This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread" exception. My question is, why there is such an exception? Why wasn't it possible to allow collection updates from any thread? Personally, I don't see any reason to block UI update when ObservableCollection is changed from other threads. If two threads (including parallel ones) are accessing the same object, one listening for changes of object properties through events, the other one doing changes, it will always work, at least if locks are used properly. So, what are the reasons?

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  • Why isn't the eigenclass equivalent to self.class, when it looks so similar?

    - by The Wicked Flea
    I've missed the memo somewhere, and I hope you'll explain this to me. Why is the eigenclass of an object different from self.class? class Foo def initialize(symbol) eigenclass = class << self self end eigenclass.class_eval do attr_accessor symbol end end end My train of logic that equates the eigenclass with class.self is rather simple: class << self is a way of declaring class methods, rather than instance methods. It's a shortcut to def Foo.bar. So within the reference to the class object, returning self should be identical to self.class. This is because class << self would set self to Foo.class for definition of class methods/attributes. Am I just confused? Or, is this a sneaky trick of Ruby meta-programming?

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  • using arrays to get best memory alignment and cache use, is it necessary?

    - by Alberto Toglia
    I'm all about performance these days cause I'm developing my first game engine. I'm no c++ expert but after some research I discovered the importance of the cache and the memory alignment. Basically what I found is that it is recommended to have memory well aligned specially if you need to access them together, for example in a loop. Now, In my project I'm doing my Game Object Manager, and I was thinking to have an array of GameObjects references. meaning I would have the actual memory of my objects one after the other. static const size_t MaxNumberGameObjects = 20; GameObject mGameObjects[MaxNumberGameObjects]; But, as I will be having a list of components per object -Component based design- (Mesh, RigidBody, Transformation, etc), will I be gaining something with the array at all? Anyway, I have seen some people just using a simple std::map for storing game objects. So what do you guys think? Am I better off using a pure component model?

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  • Is it guaranteed that new Integer(i) == i in Java?

    - by polygenelubricants
    Consider the following snippet: int i = 99999999; byte b = 99; short s = 9999; Integer ii = Integer.valueOf(9); // should be within cache System.out.println(new Integer(i) == i); // "true" System.out.println(new Integer(b) == b); // "true" System.out.println(new Integer(s) == s); // "true" System.out.println(new Integer(ii) == ii); // "false" It's obvious why the last line will ALWAYS prints "false": we're using == reference identity comparison, and a new object will NEVER be == to an already existing object. The question is about the first 3 lines: are those comparisons guaranteed to be on the primitive int, with the Integer auto-unboxed? Are there cases where the primitive would be auto-boxed instead, and reference identity comparisons are performed? (which would all then be false!)

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  • page_load another handler?

    - by joe doe
    can someone please explain why this code is not working as expected: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class temp : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Response.Write("foo<br>"); this.Load += new EventHandler(temp_Load); } void temp_Load(object sender, EventArgs e) { Response.Write("bar<br>"); Response.End(); } } trying to add another handler for page Load event so that output would be: foo<br> bar<br>

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  • Taking 2 attributes from XElement to create a dictionary LINQ

    - by AndyC
    I'm trying to take one attribute to use as the key, and another to use as the value. If I use (xDoc is an XDocument object in the example): Dictionary<string, XElement> test = xDoc.Descendants() .Where<XElement>(t => t.Name == "someelement") .ToDictionary<XElement, string>(t => t.Attribute("myattr").Value.ToString()); I get a dictionary with the myattr value as key (which is what I want) but the entire XElement object as the value. What I want to do, is to select a second attribute to set as the value property on each dictionary item, but can't seem to figure that out. Is it possible to do all of this in 1 Linq statement? Curiousity has caught me! Cheers!

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  • pass value to servlet from a hidden input type

    - by kawtousse
    I am trying to pass the parameter called value in the hidden input type to my servlet. It is like that: retour.append("<input type=\"hidden\" id=\"id_" + nomTab + "_" + compteur + "\" value=\"" + object.getIdDailyTimeSheet() + "\"/>"); retour.append("<button id=edit name=edit type=submit onClick= editarow()>"); retour.append("<img src=edit.gif />"); retour.append("</button>"); retour.append("</td>"); But the method get parameter recommend a name to be able to get the value here. So how can I deal with it? Here I want to pass to the servlet the value of object.getIdDailyTimeSheet().

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  • How do I create a create and execute an SQL command using OleDB directly?

    - by Pagis
    I want to use the OleDB interfaces directly to open a connection to a DB, create a command and executing it (for example using the ICommandText interface). The main thing I can't find is how to create the connection and the command object and how to connect the object that implements the ICommandText to the connection. In ADO I would just use the ActiveConnection property but I want to do this directly on the OleDB interfaces. Also, if anyone can recommend a tutorial to OleDB, ether online or a book, free or not that would be great (but a tutorial and not just a reference / API) I'm using C++ but any native code would be fine.

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  • set arraylist element as null

    - by Jessy
    The first index is set to null (empty), but it doesn't print the right output, why? //set the first index as null and the rest as "High" String a []= {null,"High","High","High","High","High"}; //add array to arraylist ArrayList<Object> choice = new ArrayList<Object>(Arrays.asList(a)); for(int i=0; i<choice.size(); i++){ if(i==0){ if(choice.get(0).equals(null)) System.out.println("I am empty"); //it doesn't print this output } }

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  • How can I embed a flash movie in a zend view programmatically?

    - by curro
    I have tried to embed a flash movie in a zend view using the htmlFlash helper. In theory you only have to pass the movie path to the htmlFlash helper in a phtml view: echo $this-htmlFlash('/path/to/myMovie.swf'); And the framework will generate the html code in the html page: <object data="/path/to/flash.swf" type="application/x-shockwave-flash" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab"> </object> However, I have done so and the code doesn't appear on the source code. Has anyone had this problem? Thank you

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  • an error "variable of field declared void"

    - by lego69
    I have this code: header - test.h Inside header I have some class Z and definitions of two functions test and test2 I call function test2 from test void test2(Z z, Z const *za); this is implementation of the function: void test2(Z z, Z const *za){ int i = z; //this row works cout << i << endl; } I call it from test: test2(z1, za1); // za1 is pinter to object and z1 is some object but in my header I receive an 3 errors: Multiple markers at this line - initializer expression list treated as compound expression - `A' was not declared in this scope - variable or field `quiz2' declared void can somebody please explain why? thanks in advance

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  • I am unsure of how to access a persistence entity from a JSP page?

    - by pharma_joe
    Hi, I am just learning Java EE, I have created a Persistence entity for a User object, which is stored in the database. I am now trying to create a JSP page that will allow a client to enter a new User object into the System. I am unsure of how the JSP page interacts with the User facade, the tutorials are confusing me a little. This is the code for the facade: <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Add User to System</title> </head> <body> <h2>Add User</h2> <h3>Please fill out the details to add a user to the system</h3> <form action=""> <label>Email:</label> <input type="text" name="email"><br /> <label>Password:</label> <input type="password" name="name"><br /> <label>Name:</label> <input type="text" name="name"><br /> <label>Address:</label> <input type="text" name="address"><br /> <label>Type:</label> <select name="type"> <option>Administrator</option> <option>Member</option> </select><br /> <input type="submit" value="Add" name="add"/> <input type="reset" value="clear" /> </form> </body> This is the code I have to add a new User object within the User facade class: @Stateless public class CinemaUserFacade { @PersistenceContext(unitName = "MonashCinema-warPU") private EntityManager em; public void create(CinemaUser cinemaUser) { em.persist(cinemaUser); } I am finding it a little difficult to get my head around the whole MVC thing, getting there but would appreciate it if someone could turn the light on for me!

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  • How to crete a Java Iterator that throws IOException

    - by Antonio
    I'd like to implement an iterator that retrieves objects from disk/network. Iterator itr = getRemoteIterator(); while(itr.hasNext()) { Object element = itr.next(); System.out.print(element + " "); } However the problem is that hasNext() and next() methods of the Iterator object does not allow to throw IOException. Is there any other standard interface work around this issue? Desired code is: public interface RemoteIterator<E> { boolean hasNext() throws IOException; E next() throws IOException; void remove(); }

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  • Showing/Hiding the main form in C#

    - by DazSlayer
    I am working on a program where clicking on a button on form1 will open form2. I will then hide form1 until form2 is closed. The problem I have is that I cannot get form1 to show after form2 closes. Any ideas on how to fix this? try { Form1.ActiveForm.Hide(); AddGradeForm = new Form2(Form.NumberOfSelections); AddGradeForm.ShowDialog(); MessageBox.Show(AddGradeForm.Result.ToString()); } catch (Exception i) { Form1.ActiveForm.Hide(); AddGradeForm.Dispose(); AddGradeForm = new Form2(Form.NumberOfSelections); AddGradeForm.ShowDialog(); MessageBox.Show(AddGradeForm.Result.ToString()); } Form1.ActiveForm.Show(); ERROR: NullReferenceException was unhanded. Object reference not set to an instance of an object.

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  • Static dictionary in .Net Thread safety

    - by Emmanuel
    Reading msdn documentation for dictionaries it says : "Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe." Those this mean that with a dictionary such as this : static object syncObject = new object(); static Dictionary<string,MyObject> mydictionary= new Dictionary<string, MyObject>(); Is doing something like the code below unnecessary? lock (syncObject) { context = new TDataContext(); mydictionary.Add("key", myObject); }

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  • How can I call a COM component using JavaScript in Mozilla?

    - by kumar
    I am calling a COM component in IE. Here is the code <object align="left" classid="CLSID:22D6F312-B0F6-11D0-94AB-0080C74C7E95" id="Winvideo-Silverlight2RTW-Hypervideo-Part1-WMVa.wmv"> <param name="FileName" value="Winvideo-Silverlight2RTW-Hypervideo-Part1-WMVa.wmv"> <param name="AutoRewind" value="true"> <param name="AutoStart" value="false"> <param name="ClickToPlay" value="true"> <param name="Mute" value="false"> <param name="ShowControls" value="true"> <param name="ShowDisplay" value="true"> <param name="ShowTracker" value="true"> <param name="PlayCount" value="1"> </object> It is working fine in IE, but not in Mozilla Firefox.

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