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  • Features to remove from C++

    - by Justin Ethier
    This question was inspired by What features would you like to see added to C++? (also see What features do you miss in C++?). C++ is a great general-purpose language, but perhaps too general and feature-rich: multiple inheritance, operator overloading, manual memory management, templates, smart pointers, virtual destructors, legacy frameworks (think MFC), and I could go on. Is there any one feature or aspect of C++ that you would like removed to make our lives easier as C++ developers? One feature per answer, please.

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  • Java: empty ArrayLists in a foor loop

    - by Patrick
    hi, I'm reusing the same ArrayList in a for loop, and I use for loop results = new ArrayList<Integer>(); experts = new ArrayList<Integer>(); output = new ArrayList<String>(); .... to create new ones. I guess this is wrong, because I'm allocating new memory. Is this correct ? If yes, how can I empty them ? Added: another example I'm creating new variables each time I call this method. Is this good practice ? I mean to create new precision, relevantFound.. etc ? Or should I declare them in my class, outside the method to not allocate more and more memory ? public static void computeMAP(ArrayList results, ArrayList experts) { //compute MAP double precision = 0; int relevantFound = 0; double sumprecision = 0; thanks

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  • Obsolete createEvenSource

    - by user311130
    Hello, I want to create a new customevent log ( "My EeventLog") on a remote machine. createEventSource(String,String,String) method was perferct for my need. Unfortenatly, this method is Obsolete. My questions is: the two other alternatives don't allow evenlog creation over a remote machine (correct me if I'm wrong). http://msdn.microsoft.com/en-us/library/system.diagnostics.eventlog.createeventsource.aspx So, my easiest way to do it- is be created a new exe and run it remotely with Psexe. right? Could I count eventlog entries that have some specific ID ? Regards,

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  • Subtype polymorphism and arrays

    - by user133466
    Computer[] labComputers = new Computer[10]; with public class Computer { ... void toString(){ // print computer specs } } public class Notebook extends Computer{ ... void toString(){ // print computer specs + laptop color } } each subscripted variable labComputers[i] can reference either a Computer object or a Notebook object because Notebook is a subclass of Computer. For the method call labComputers[i].toString(), polymorphism ensures that the correct toString method is called. I wonder what if we do Notebook[] labComputers = new Notebook[10]; what kind or error would I get if I reference with Computer object and a Notebook object

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  • HTMLtags in input field

    - by megapool020
    I have a question about inserting values into an input field from my MYSQL DB. First I have a form to save data from an inputfield to the database. An extra script filters diacrits Á=&Aacute; to html code. So Állo will be saved like &Aacute;llo When I insert the data from the DB to a 'div' it shows Állo. When I insert the data into a input field it shows &Aacute;llo What am I doing wrong I use JQUERY to save data to the DB with the $.post method without pagerefresh. I also get the data from the DB with JQUERY $.post method without pagerefresh. Hope somebody can help.

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  • Searching for URL's Relative to Site Root in Javascript Source

    - by James
    Hi, I am working on a web site with several other developers and we have had problems where people commit JavaScript code with AJAX calls that use URL's relative to the site root. An example would be /Home/Index which will not work if the site is hosted in a virtual directory. To get round the problem we use a $.url() method to convert it to a full path, e.g. $("#container").load($.url("/Home/Index")) I am trying to write a unit test that will search each JavaScript file and find places where the $.url method is not being used. The only problem is that I cannot seem to write a regex expression to do this. I have tried the following: (?!\$\.url\()"(/\w*)+" But this does not work. I cannot find a way to say that I don't want the $.url in front. Does anyone know if this is possible? Note that I need regular expressions that are compatible with .NET Thanks.

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  • how does tomcat like web container handle struts 2 variables ?

    - by mobby1982
    i am a newbie . i have a question regarding struts 2 framework and tomcat . i know that each request has it own thread , but my question is are the global variables defined in struts action shared amongst requests. for ex: if i have a global variable named say int pageNo; and i am using in say method called paginationAll() can i use the same variable (pageNo) for another method called say paginatonMaterialAll() in the same action or does each thread has its own set of variables even though globally defined?

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  • folder deleting not working

    - by user1150440
    If System.IO.Directory.Exists(HttpContext.Current.Server.MapPath(Server.MapPath("images/TravelogueGallery/" & getMaxID()))) Then System.IO.Directory.Delete(HttpContext.Current.Server.MapPath("images/TravelogueGallery/" & getMaxID()), True) End If I am using the above code snippet to delete a directory but i get this error "'G:\Projects\Latest\LTCIndia 05-04-12 1415\images\TravelogueGallery\19' is not a valid virtual path. " Whats wrong with the code?

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  • Javascript Methodname is replaced with !==

    - by dasheddot
    Hey! On the server lies a html file with javascript code included. This javascript code includes a method called something like "CheckObject". This file works for all users, except one specific (but important). He gets a javascript error and in his browser sourcode appears something unbelievable: The methodname "CheckObject" is replaced with "Check!==ect", means the "Obj" of the method name is replaced with !==. Why could that be? Hope anybody can help me! Best regards

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  • Linking ?++ - BDB - LNK2001

    - by MInner
    BDB is compiled on the same PC, under same VS. #include <db_cxx.h> int main(){ Db b(NULL, 0); return 0; } 1main.obj : error LNK2001: unresolved external symbol ""public: virtual __thiscall Db::~Db(void)" (??1Db@@UAE@XZ)" 1main.obj : error LNK2001: unresolved external symbol ""public: __thiscall Db::Db(class DbEnv *,unsigned int)" (??0Db@@QAE@PAVDbEnv@@I@Z)" what could be wrong?

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  • In Python, is it better to use list comprehensions or for-each loops?

    - by froadie
    Which of the following is better to use and why? Method 1: for k, v in os.environ.items() print "%s=%s" % (k, v) Method 2: print "\n".join(["%s=%s" % (k, v) for k,v in os.environ.items()]) I tend to lead towards the first as more understandable, but that might just be because I'm new to Python and list comprehensions are still somewhat foreign to me. Is the second way considered more Pythonic? I'm assuming there's no performance difference, but I may be wrong. What would be the advantages and disadvantages of these 2 techniques? (Code taken from Dive into Python)

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  • GCC compiler -- bug or unspecified behavior?

    - by Jared P
    When I have conflicting definitions of the ivars of a class in objective-c (not redeclaring the class in the same file, but rather naming the same class with diff ivars, no warnings or better yet errors are issued by the compiler. However, both sets of ivars are useable by the appropriate methods in the respective files. For instance Foo.m: @interface foo { int a; } - (int)method; @end @implementation foo - (int)method { return a; } @end Bar.m: @interface foo { float baz; } @end @implementation foo (category) - (float)blah { return baz; } @end compiles without warnings or errors. Is this intentional? Is this an unchecked error? (for the record, a and baz are actually the same memory location.)

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  • display data from tables that contain a null value

    - by user2631662
    I need the code below to say - if myReader reads a null entry a new method is called. At the moment it will not display data from tables that contain a null value conDataBase.Open(); myReader = cmdDataBase.ExecuteReader(); while (myReader.Read()) { if (myReader["Code_CodeID"] != DBNull.Value) { string sFirst = myReader["First"].ToString(); string sLast = myReader["Last"].ToString(); string sAdd1 = myReader["Address1"].ToString(); string sCode = myReader["Code"].ToString(); txtFirst.Text = sFirst; txtSecond.Text = sLast; txtadd1.Text = sAdd1; txtDeviceIMEI.Text = sCode; } } } else { //go to a new method } }

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  • QuickTime movie disappearing from Javascript when scrolled offscreen in Firefox?

    - by c-had
    I have a web page I'm creating that uses Javascript to control an embedded QuickTime player. I add the QuickTime movie to the page using the AC_QuickTime.js file from Apple (as described here - http://developer.apple.com/mac/library/documentation/QuickTime/Conceptual/QTScripting_HTML/QTScripting_HTML_Document/ScriptingHTML.html#//apple_ref/doc/uid/TP40001525-2-SW1 ). Everything seems to be working fine - I can call methods on the QuickTime movie and control its playback (as well as get the current timestamp). The problem is that in Firefox, when I scroll down such that the QuickTime player is no longer visible, I get the following error every time I try to call a method on the QuickTime movie: Error calling method on NPObject! This does not occur in Safari. Why is this happening, and is there any way to work around this?

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  • Customized annotation problem

    - by user128647
    I want my custom UIView (.Xib View) to appear when user tabs on pins (not apple's callOutBubble) and in that UIView there should be a button which fires an IBAction on touched down event. Therefore I have added an AddObserver method to MKAnnotationView. which responds to touch events over pin in MKMapView. I have also added 3 buttons over that XIB view, which have also assigned IBActions. But when I run my application, buttons in the customized annotation view are not responding to IBAction (Touch Down). Why does this happen, and how can I fix it? I need to call a method when those 3 buttons are tabbed.

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  • Algorithms after load-balancer?

    - by Vimvq1987
    I need to study about load-balancers, such as Network Load Balancing, Linux Virtual Server, HAProxy,...There're somethings under-the-hood I need to know: What algorithms/technologies are used in these load-balancers? Which is the most popular? most effective? I expect that these algorithms/technologies will not be too complicated. Are there some resources written about them? Thank you very much for your help.

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  • Enter custom file name to be read ?

    - by ZaZu
    Hello, I want to allow users to type the name of any .txt file to be read/written. This is my code : printf("Enter .txt file name\n"); scanf("%s",&fname); FILE *inputf; inputf=fopen(&fname,"w"); Problem is this method does not work (having &fname) as a parameter. I can imagine its because C needs "filename.txt" for it work ... even if I enter for example : "custom.txt", the program returns an error of "Storage block not big enough for this operation" What is the correct method to accomplish this ? Im using C and im pretty much using basic commands .. (not too advanced) Thanks alot !!!

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  • bash screen title usage (screen -t "something")

    - by atrioom
    I was working with screen lately and wanted to use the -t option for it. What's the point of the-t option if the title of the screen does not show anywhere like when using -list or within the screen when it's attached? There is a command CTRL-A double-quote(") to see all active screens, and then it shows the title, but that does not really do the job, because I have to have the screen attached already. I want to read out the title BEFORE attaching any screens, to attach the right one in the first place. Is there a method to use -t in a convenient way? Edit: There is one method: "ctrl-a "" and then "ctrl-a {numberofscreen}". I guess that's the best way to use the screen titles?

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  • Calling SharedPrefences on AppWidget

    - by Rexx
    Hello all, I would like to know if there is an issue with calling a sharedPeference value on an appWidget provider class so i can use it for an update. I have this code which i call on a method in the appWidget provider class, but it keeps giving me compilation error and that i should create a method for it. this is the code: prefs = getSharedPreference("myPrefs", Context.MODE_PRIVATE); is this a known issue and is there any other way i can pass the value from my configuration class, if this is not possible. Thank you

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  • Deleting files associated with model - django

    - by alexBrand
    I have the following code in one of my models class PostImage(models.Model): post = models.ForeignKey(Post, related_name="images") # @@@@ figure out a way to have image folders per user... image = models.ImageField(upload_to='images') image_infowindow = models.ImageField(upload_to='images') image_thumb = models.ImageField(upload_to='images') image_web = models.ImageField(upload_to='images') description = models.CharField(max_length=100) order = models.IntegerField(null=True) IMAGE_SIZES = { 'image_infowindow':(70,70), 'image_thumb':(100,100), 'image_web':(640,480), } def delete(self, *args, **kwargs): # delete files.. self.image.delete(save=False) self.image_thumb.delete(save=False) self.image_web.delete(save=False) self.image_infowindow.delete(save=False) super(PostImage, self).delete(*args, **kwargs) I am trying to delete the files when the delete() method is called on PostImage. However, the files are not being removed. As you can see, I am overriding the delete() method, and deleting each ImageField. For some reason however, the files are not being removed.

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