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• when is java faster than c++ (or when is JIT faster then precompiled)?

  - by kostja

  I have heard that under certain circumstances, Java programs or rather parts of java programs are able to be executed faster than the "same" code in C++ (or other precompiled code) due to JIT optimizations. This is due to the compiler being able to determine the scope of some variables, avoid some conditionals and pull similar tricks at runtime. Could you give an (or better - some) example, where this applies? And maybe outline the exact conditions under which the compiler is able to optimize the bytecode beyond what is possible with precompiled code? NOTE : This question is not about comparing Java to C++. Its about the possibilities of JIT compiling. Please no flaming. I am also not aware of any duplicates. Please point them out if you are.

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• SFML 2.0 crashes anytime a method is called

  - by Ken

  This code generates an exception: #include <SFML/Graphics.hpp> #include <SFML/Window.hpp> #include <SFML/System.hpp> int main() { sf::Clock clock; clock.getElapsedTime(); return 0; } However, this doesn't crash: #include <SFML/Graphics.hpp> #include <SFML/Window.hpp> #include <SFML/System.hpp> int main() { sf::Clock clock; return 0; } I'm using SFML 2.0, Windows 7, MinGW 4.70 (Code::Blocks). I don't know why, I followed all instructions to link the libraries and nothing seems to be working. I might be missing something simple through my anger (I've been trying to run sample code for a week, nothing has been working), so can anybody throw me a bone?

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• Change Makefile variable value

  - by paulgray

  Is there a way to reassign Makefile variable value inside of the target body? What I am trying to do is to add some extra flags for debug compilation: %.erl: %.beam $(ERLC) $(ERLFLAGS) -o ebin $< test: clean debug_compile_flag compile compile_test debug_compile: $(ERLCFLAGS) += -DTEST So if I invoke test target I would like to clean up my environment, add some new flags (like -DTEST to the existing ones), compile the whole code once again (first sources, then test modules). I do not want to copy/paste the code for compiling with some new flags set since there is a lot of logic put here and there. Is there some easy way to redefine the variable value so I can reuse the existing code?

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• DataSet.HasChanges is true even immediately after TableAdapter.Update is run

  - by Nathan Koop

  I've got some legacy dataset code which I'm updating. I'm attempting to determine if the dataset has changes to it so I can properly prompt for a save request. However myDataset.HasChanges() always returns true. In my save method I've edited the code to determine when the dataset get's changes and made the code like this: 1. myBindingSource.EndEdit() 2. myTableAdapter.Update(myDataSet) 3. myBindingSource.EndEdit() After line 1, - myDataSet.HasChanges = true (understandable) After line 2, - myDataSet.HasChanges = false (understandable) After line 3, - myDataSet.HasChanges = true I'm unsure of why this would occur in line 3, shouldn't this be false because I just ran the updates on the dataset?

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• Difference between static const char* and const char*.

  - by Will MacDonagh

  Could someone please explain the difference in how the 2 snippets of code are handled below? They definitely compile to different assembly code, but I'm trying to understand how the code might act differently. I understand that string literals are thrown into read only memory and are effectively static, but how does that differ from the explicit static below? struct Obj1 { void Foo() { const char* str( "hello" ); } }; and struct Obj2 { void Bar() { static const char* str( "hello" ); } };

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• calling invokeAndWait from the EDT

  - by Aly

  Hi, I have a problem following from my previous problem. I also have the code SwingUtillities.invokeAndWait somewhere else in the code base, but when I remove this the gui does not refresh. If I dont remove it the error I get is: Exception in thread "AWT-EventQueue-0" java.lang.Error: Cannot call invokeAndWait from the event dispatcher thread at java.awt.EventQueue.invokeAndWait(Unknown Source) at javax.swing.SwingUtilities.invokeAndWait(Unknown Source) at game.player.humanplayer.model.HumanPlayer.act(HumanPlayer.java:69) The code in HumanPlayer.act is: public Action act(final Action[] availiableActions) { try { SwingUtilities.invokeAndWait(new Runnable() { @Override public void run() { gui.update(availiableActions); } }); } catch (InterruptedException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } synchronized(performedAction){ while(!hasPerformedAction()){ try { performedAction.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } setPerformedAction(false); } return getActionPerfomed(); }

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• JQuery Validate Dynamic Table

  - by Richard

  I'm using the JQuery validation plug to validate my entire form. I also have a dynamic table on my registration page where the user can register more people. I can validate the rest of the form fine but my goal is to validate the table inputs just the same. Here is my jfiddle code: tables I don't know why the add line won't work there but it definitely works on my page. Anyway, that code ends up validate ONLY the first row of my table, but I want it to validate every single row. Can anyone see any problems with the code?

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• how to deal with a static analyzer output

  - by Jim

  We have started using a static analyzer (Coverity) on our code base. We were promptly stupefied by the sheer amount of warnings we received (its in the hundreds of thousands) , it will take the entire team a few mounts to clear them all (obliviously impossible). the options we discussed so far are 1) hire a contractor to sort out the warning and fix them - he drawback: we will probably need very experiences people to do all these modifications, and no contractor will have required understanding of the code. 2) filter out the warning and deal only with the dangerous ones - the problem here is that our static analysis output will always be cluttered by warning making it difficult for us to isolate problems. also the filtering of the warning is also a major effort. either way, bringing our code to a state when the static analyzer can be a useful tool for us seems a monumental task. so how is it possible to work with the static analyzer without braining current development efforts into a complete stand still?

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• FOSUserBundle: embedding the login form and choosing its template

  - by tirengarfio

  i want to insert the login form of FOSUserBundle in my template like this: <div id="sidebar"> {% render "FOSUserBundle::Security::login" %} </div> but not to render the template that is been calling in the code of loginAction() originally. I have thought I'd find useful the possibility of passing the template I want to render as a parameter as 'max' in this example: <div id="sidebar"> {% render "AcmeArticleBundle:Article:recentArticles" with {'max': 3} %} </div> Is that possible in symfony2? If not.. should I create another action for my bundle with the same code inside of loginAction? or should I modify the original loginAction code and write control structures? if(currentPage == 'home') renderResponse('template1') else renderResponse('template2')

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• How do I call functions of an object inside the same object?

  - by Roly

  I have the following Javascript code add_num = { f: function(html, num) { alert(this.page); }, page : function() { return parseInt(this.gup('page')); }, gup : function(name) { name = name.replace(/[\[]/,'\\\[').replace(/[\]]/,'\\\]'); var regex = new RegExp('[\\?&]'+name+'=([^&#]*)'); var results = regex.exec(window.location.href); if(results == null) return ''; else return results[1]; } } But when I call add_num.f() what I get from alert() is the actual code of page. That is, it returns function() { return parseInt(this.gup('page')); } I was expecting a numeric value and not any code at all.

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• How do I configure emacs for editing HTML files that contain Javascript?

  - by MakeDummy

  I have started the painful first steps of using emacs to edit an HTML file with both HTML tags and javascript content. I have installed nxhtml and tried using it - i.e set up to use nxhtml-mumamo-mode for .html files. But I am not loving it. When I am editing the Javascript portion of the code the tab indents do not behave as they do when editing C/C++ code. It starts putting tabs within the line and if you try and hit tab in the white space preceding a line it inserts the tab rather than re-tabifying the line. Another aspect that I don't like is that it doesn't do syntax colouring like the usual C/C++ modes do. I much prefer the behaviour of the default java-mode when editing HTML files but that doesn't play nicely with the HTML code. :-( 1) Is there a better mode for editing HTML files with Javascript portions? 2) Is there a way to get nxhtml to use the default java-mode for the javascript portions? Regards, M

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• how to display a image in java application

  - by Nubkadiya

  i want to display a image in my java application. i found a code to download the image from the webserver. what that code do is it takes the image and show it in the jframe. i want to use a label to show the image or soemthing else. so i can put it in my java application. can someone help me. it shouldnt be JFrame please help me here is my code Image image = null; try { URL url = new URL("http://www.personal.psu.edu/acr117/blogs/audrey/images/image-2.jpg"); image = ImageIO.read(url); } catch (IOException e) { } // Use a label to display the image JFrame frame = new JFrame(); JLabel lblimage = new JLabel(new ImageIcon(image)); frame.getContentPane().add(lblimage, BorderLayout.CENTER); frame.setSize(300, 400); frame.setVisible(true); } can someone help me

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• C# compile finalize method's on runtime?

  - by Royi Namir

  As im reading through 3 books about GC , ive notice some strange fact : C# via CLR CriticalFinalizerObject : the CLR treats this class and classes derived from it in a very special manner what ??? "not find enough memory to COMPILE a method? " IMHO - the code should be already compiled... no ? when Im writing c# code - the whole code is compiled to IL before its running... no? but according to the text - at RUNTIME - he MAY find insufficient memory for compile... Help ?

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• My Thread Programs Crash

  - by zp26

  I have a problem with threads objectiveC. The line of code below contains the recv block the program waiting for a datum. My intention is to launch a thread parallel to the program so that this statement does not block any application. I put this code in my program but when active switch the program crashes. Enter the code. -(IBAction)Chat{ if(switchChat.on){ buttonInvio.enabled = TRUE; fieldInvio.enabled = TRUE; [NSThread detachNewThreadSelector:@selector(riceviDatiServer) toTarget:self withObject:nil]; } else { buttonInvio.enabled = FALSE; fieldInvio.enabled = FALSE; } -(void)riceviDatiServer{ NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init]; int ricevuti; NSString *datiRicevuti; ricevuti = recv(temp, &datiRicevuti, datiRicevuti.length, 0); labelRicezione.text = [[NSString alloc] initWithFormat:@"%s.... %d", datiRicevuti, ricevuti]; [pool release]; }

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• libriaries on Android

  - by Will

  In native development, you can produce libraries - .so, .dll etc - that other libraries and programs can share. In Java, you can put your code in a JAR in the classpath and other programs and libraries can use it. So how can you do modular programs in Android? I get the impression from the documentation that each APK is a self-contained island. Can different APKs share code? And how does installation work when you have these external dependencies? Can you specify that you rely on library that is not in your APK and get it installed too? If you can't have 'dynamic linking', can you have 'static linking' by developing your shared code and somehow putting the equiv of a JAR into each APK that requires it?

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• PHP Escaping from HTML, faster, cleanner?!

  - by rno

  I've read about it from the php website (http://us3.php.net/manual/en/language.basic-syntax.phpmode.php) Using: echo "<html tag>" is slower and also annoying because you got to escape char like " with \" But what's about using $output = <<< EOF <html code> EOF; Then later on in the code I can use $output .= <<< EOF <some more html code> EOF; then when I want to print it: echo "$output"; I think it's a great idea, but really wonder what you PHP guru think about it. Cheers, rno

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• How to get current directory in C# for any Windows version?

  - by DarthRoman

  I am creating an application that can be executed in any windows version, even in mobile's, and I am trying to get the current directory of the executable. The problem is that if I use the following code, it doesn't compile in Windows Mobile: string currentDirectory = System.IO.Path.GetDirectoryName(System.Windows.Forms.Application.ExecutablePath); And if I use this code, I receive something like: file:\C:\xxx string currentDirectory = System.IO.Path.GetDirectoryName(System.Windows.Forms.Application.ExecutablePath); Although, I need to get the root drive, and this code doesn't compile in Windows Mobile: String rootPath = Path.GetPathRoot(Environment.SystemDirectory); Does anyone know how to get the current directory of the application and the root path for any windows version, even mobile's?

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• About the fix for the interference between Company mode and Yasnippet

  - by janoChen

  Emacs wiki says: Company does interfere with Yasnippet’s native behaviour. Here’s a quick fix: http://gist.github.com/265010 The code is the following: (define-key company-active-map "\t" 'company-yasnippet-or-completion) (defun company-yasnippet-or-completion () (interactive) (if (yas/expansion-at-point) (progn (company-abort) (yas/expand)) (company-complete-common))) (defun yas/expansion-at-point () "Tested with v0.6.1. Extracted from `yas/expand-1'" (first (yas/current-key))) I placed that code in my .emacs and the following message appeared: Warning (initialization): An error occurred while loading `c:/Documents and Settings/Alex.AUTOINSTALL.001/Application Data/.emacs.elc': Symbol's value as variable is void: company-active-map To ensure normal operation, you should investigate and remove the cause of the error in your initialization file. Start Emacs with the `--debug-init' option to view a complete error backtrace. Do I have to place the fix code inside a YASnippet's .el file? or in my .emacs (which throws me an error)?

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• Where can I find a proper JavaScript beautifier

  - by Ernelli

  I have used http://jsbeautifier.org/ successfully using Rhino and ant, but the problem is that it is not deterministic. If you run the beautifier twice on a file the result is different from each time, e.g. each pass inserts additional array intendation on some lines. I have spent a lot of time debugging the code in beautify.js and have made some workarounds for comment handling, but the array indentation bug is annoying. Is there a correct and properly working JS code formatter anywhere that can be used as part of a source code indentation verification system? EDIT I have now tested with preserve-array-formating disabled, and it seems that it solves the problem. Too bad, since preserve-array-formating is quite useful with large array constructs.

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• Show Alertdialog and use vibrator

  - by user1007522

  I'm having a class that implements RecognitionListener like this: public class listener implements RecognitionListener I wanted to show a alertdialog and use the vibrator but this isn't possible because I need to provide a context what I don't have. My alertdialog code was like this: new AlertDialog.Builder(this) .setTitle("dd") .setMessage("aa") .setNeutralButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { } }) .show(); But the AlertDialog.Builder(this) wants a context, the same problem with my vibrator code: v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE); The getSystemService method isn't available. My code that starts the class: sr = SpeechRecognizer.createSpeechRecognizer(this); sr.setRecognitionListener(new listener()); Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); intent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE,"voice.recognition.test"); intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS,5); sr.startListening(intent); Whats the best way to solve this?

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• How to read in a negative double with scanf() in C

  - by rize

  I'm learning basics of C and writing a simple first order equation solver. I want the input to be exactly ax+b=c or ax-b=c, where a, b, c are double type. I'm employing scanf() to read in user input and to check if it's of the correct form. However, if I enter a negative double, -4.6 say, as the "a" in the equation, scanf() won't read the a,b,c correctly. I'm using %lf inside scanf(). How do I read a negative double, then? Many thanks. My code: if (scanf("%lfx+%lf=%lf", &a, &b, &c)) more code If I use as the input "-6.2x+3.4=-5.9", the value 3.4 will be assinged to variable a, while b and c remain as they were and "more code" is run.

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• How can I create a qr// in Perl 5.12 from C?

  - by kristina

  This has been working for me in 5.8 and 5.10, but in 5.12 my code creates this weird non-qr object: # running "print Dumper($regex)" $VAR1 = bless( do{\(my $o = '')}, 'Regexp' ); Whereas printing a qr// not created by my code looks like this: # running "print Dumper(qr/foo/i)" $VAR1 = qr/(?i-xsm:foo)/; My code is basically: REGEXP *rx = re_compile(pattern, flags); SV *regex = sv_2mortal(newSVpv("",0)); sv_magic(regex, (SV*)rx, PERL_MAGIC_qr, 0, 0); stash = gv_stashpv("Regexp", 0); sv_bless(newRV((SV*)regex), stash); Anyone know how to correctly create a regex from a string in 5.12?

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• windows service

  - by zubin71

  I need to write a windows service which executes an application after a certain amount of time. I have checked out the code in MSDN and found an example in which the System.ServiceProcess.ServiceBase class is sub-classed. I did the following. created a new C# console application copied the code from the MSDN example Run I get the following error The type or namespace name 'ServiceProcess' does not exist in the namespace 'System'(are you missing an assembly reference?) As i had copied the example from MSDN, i have no idea why the code still does not work. This is my first experience writing services and i`d love some guidance. thnkx!

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• java.awt.HeadlessException thrown from HeadlessGraphicsEnvironment.getDefaultScreenDevice

  - by Omry

  I need to do some image processing on a java server (Debian with java version "1.6.0_12"), and I am receiving java.awt.HeadlessException from my code: java.awt.HeadlessException at sun.java2d.HeadlessGraphicsEnvironment.getDefaultScreenDevice(HeadlessGraphicsEnvironment.java:64) at WaxOn.getDefaultConfiguration(WaxOn.java:341) Even when java.awt.headless is set to true (as evident by this code printing so): if (!java.awt.GraphicsEnvironment.isHeadless()) { logger.warn("Headless mode is not enabled"); } else { logger.info("Headless mode"); } This is the code that throws the exception: public static GraphicsConfiguration getDefaultConfiguration() { GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); GraphicsDevice gd = ge.getDefaultScreenDevice(); return gd.getDefaultConfiguration(); } Any idea how to solve this?

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• Why avoid pessimistic locking in a version control system?

  - by raven

  Based on a few posts I've read concerning version control, it seems people think pessimistic locking in a version control system is a bad thing. Why? I understand that it prevents one developer from submitting a change while another has the file checked out, but so what? If your code files are so big that you constantly have more than one person working on them at the same time, I submit that you should reorganize your code. Break it up into smaller functional units. Integration of concurrent code changes is a tedious and error-prone process even with the tools a good version control system provides to make it easier. I think it should be avoided if at all possible. So, why is pessimistic locking discouraged?

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