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  • Is a program compiled with -g gcc flag slower than the same program compiled without -g?

    - by e271p314
    I'm compiling a program with -O3 for performance and -g for debug symbols (in case of crash I can use the core dump). One thing bothers me a lot, does the -g option results in a performance penalty? When I look on the output of the compilation with and without -g, I see that the output without -g is 80% smaller than the output of the compilation with -g. If the extra space goes for the debug symbols, I don't care about it (I guess) since this part is not used during runtime. But if for each instruction in the compilation output without -g I need to do 4 more instructions in the compilation output with -g than I certainly prefer to stop using -g option even at the cost of not being able to process core dumps. How to know the size of the debug symbols section inside the program and in general does compilation with -g creates a program which runs slower than the same code compiled without -g?

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  • UIScrollView Does not Scroll

    - by paul simmons
    I have added a long info screen to my iPhone app. The info is a long UIImageView, and it is contained inside a UIScrollView. They are both defined in .xib file. At run-time, initially I set scrollview's position outside window, and when user clicks a button, set its position inside window. This part is OK. But scrollview displays the image but does not scroll. Isn't it enough to place in MainViewContoller.xib, set the contained content, and (at code) set its contentSize equal to the content's size? BTW: I try it at simulator currently.

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  • acts_as_taggable_on and auto_complete returning no results

    - by Sean Johnson
    I'm using acts_as_taggable_on in a model, and am trying to implement the auto_complete plugin. It seems as though I have everything hooked up correctly, but the search isn't returning any results. Here's what I have so far: In the view: <%= text_field_with_auto_complete(:link, :tag_list, {}, {:tokens => ','}) %> In the controller: def auto_complete_for_link_tag_list @tags = Link.tag_counts_on(:tags).where('tags.name LIKE ?', params[:link][:tag_list]) render :inline => "<%= auto_complete_result(@tags, 'name') %>", :layout => false logger.info "#{@tags.size} tags found." end The logger keeps returning 0 tags, and nothing shows up in the view (yeah, the layout includes the javascript defaults). Any thoughts or advice would be awesome.

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  • centering ul so that columns will be centered too

    - by user1815176
    In my page I want it so that when you resize the page past the point of the pictures, that the pictures will go into another row, all the way so each picture has it's own row. And then potentially I won't need any media queries. But unfortunaltely I can't find a way to center. I have tried everything I can think of, aside of making hundreds of media queries with different positioning. I can't make it a block because then it won't go into rows, I have tried margin: 0 auto;. I have tried changing the padding, I have even tried using the html align="center". Nothing is working. Here is the website http://spencedesign.netau.net/singaporehome.html Also I have a minor issue, sorry to croud this with two questions. But when it is in it's mobile state, there is no 10px padding at the bottom, and the singapore title is on the left side rather than floating. Here is my code <html> <head> <title> Singapore - Home </title> <link rel="shortcut icon" href="favicon.ico" type="image/x-icon" /> <meta name="viewport" content="width=device-width, initial scale=1.0"> <style> * { margin: 0; padding: 0; } body { background: url('woodbackground.jpg'); background-size: cover; min-height: 100%; min-width: 100%; position: relative; top: 0; bottom: 0; left: 0; right: 0; } #container { width: 90%; margin: 0 auto; } h1 { font: bold 65px Helvetica, Arial, Sans-serif; text-align: center; color: #eee; position: relative; top: 60px; } h3 { font: 25px Helvetica, Arial, Sans-serif; text-align: center; color: #eee; position: relative; top: 80px; } ul#gallery { list-style: none; display: inline; margin: 0 auto; position: relative; top: 175px; width: 1300px; } ul#gallery li a { float: left; padding: 10px 10px 25px 10px; background-color: #eee; border: 1px solid #fff; -moz-box-shadow: 0px 2px 15px #333; position: relative; margin: 10px; text-decoration: none; } ul#gallery li a:hover { position: relative; top: -15px; } ul#gallery li a img { height: 150px; width: 250px; max-width: 100%; } ul#gallery li a p { margin-top: 25px; text-align: center; color: #000; font: Helvetica, Arial, Sans-serif; text-decoration: none; font-size: 20px; } @media screen and (max-width: 640px)    { ul#gallery {   left: 2.2%;   width: 600px; }   ul#gallery li a:hover {   top: 0px; } } </style> <body> <div id="container"> <h1> Singapore </h1> <h3><i> Singapore is the worlds first machine that works </i>- Lee Kuan Yew </h3> <ul id="gallery"> <li><a href="#"> <img src="gallery.jpg" alt="gallery" /> <p> Gallery </p> </a></li> <li><a href="#"> <img src="facts.jpg" alt="facts" /> <p> Facts </p></a></li> <li><a href="#"> <img src="tour.jpg" alt="tour" /> <p> Tour </p></a></li> <li><a href="#"> <img src="author.jpg" alt="author" /> <p> Author </p> </a></li> </ul> <br/> </div><!-- Container --> </body> <html> Thanks!

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  • How to lowercase every element of a collection efficiently?

    - by Chris
    Whats the most efficient way to lower case every element of a list or set? My idea for a List: final List<String> strings = new ArrayList<String>(); strings.add("HELLO"); strings.add("WORLD"); for(int i=0,l=strings.size();i<l;++i) { strings.add(strings.remove(0).toLowerCase()); } is there a better, faster way? How would this exmaple look like for a set? As there is currently no method for applying an operation to each element of a set (or list) can it be done without creating an additional temporary set? Something like this would be nice: Set<String> strings = new HashSet<String>(); strings.apply( function (element) { this.replace(element, element.toLowerCase();) } ); Thanks,

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  • Reason for monolithic data files

    - by Ali Lown
    Primarily this seems to be a technique used by games, where they have all the sounds in one file, textures in another etc. With these files commonly reaching the GB size. What is the reason behind doing this over maintaining it all in subdirectories as small files - one per texture which many small games use this, with the monolithic system being favoured by larger companies? Is there some file system overhead with lots of small files? Are they trying to protect their property - although most just seem to be a compressed file with a new extension?

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  • How to print an isosceles triangle

    - by Steve
    Hello, I'm trying to learn programming by myself, I'm working from a book that has the following problem which I can't solve: Allow the user to input two values: a character to be used for printing an isosceles triangle and the size of the peak for the triangle. For example, if the user inputs # for the character and 6 for the peak, you should produce the following display: # ## ### #### ##### ###### ##### #### ### ## # This is the code I've got so far: char character; int peak; InputValues(out character, out peak); for (int row = 1; row < peak * 2; row++) { for (int col = 1; col <= row; col++) { Console.Write(character); } Console.WriteLine(); } Console.Read() // hold console open Thanks in advance.

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  • How to pass a touch event to other views?

    - by Eugene
    +-----------------------+ +--------------------+ | A | | A | | +-------------------+ | | +----------------+ | | |B | | | | C | | | | | | | | | | | +-------------------+ | | +----------------+ | +-----------------------+ +--------------------+ I have a view hierarchy as above. (Each of B and C takes up whole space of A, Each of them are screen size. B is added first and C is added next) For a reason, C is getting a touch event for scroll effect (B is cocos2d-x layer and C(scroll view) sets the B's position when scrollViewDidScroll http://getsetgames.com/2009/08/21/cocos2d-and-uiscrollview/ ) And I want to pass touch event to B or it's subviews when it's not scrolling. How can I pass the touch event to B here?

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  • How do I determine the dimensions of a .NET listview at runtime?

    - by Dave
    I have a form with a split container and each panel has a list view and some buttons. I wanted to make sure that the header and at least two rows are visible in a listview. I originally determined the values for panel1MinSize & panel2MinSize by fine tuning the values visually (on my XP development machine). This approach was fine until I tested my app on Windows Vista - the basic dimensions of the listview are different and the listview is too small. To overcome this I believe I need to determine the listview dimensions at runtime and do some maths to set the panel min size but I can't see how to do this. Is this the right approach or is there an easier way?

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  • Thread Local Memory for Scratch Memory.

    - by Hassan Syed
    I am using Protocol Buffers and OpensSSL to generate, HMACs and then CBC encrypt the two fields to obfuscate the session cookies -- similar Kerberos tokens. Protocol Buffers' API communicates with std::strings and has a buffer caching mechanism; I exploit the caching mechanism, for successive calls in the the same thread, by placing it in thread local memory; additionally the OpenSSL HMAC and EVP CTX's are also placed in the same thread local memory structure ( see this question for some detail on why I use thread local memory and the massive amount of speedup it enables even with a single thread). The generation and deserialization, "my algorithms", of these cookie strings uses intermediary void *s and std::strings and since Protocol Buffers has an internal memory retention mechanism I want these characteristics for "my algorithms". So how do I implement a common scratch memory ? I don't know much about the rdbuf of the std::string object. I would presumeably need to grow it to the lowest common size ever encountered during the execution of "my algorithms". Thoughts ?

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  • Could not realize media player

    - by user556894
    I am using this code to run avi file using jmf but the error come like "Could not realize media player" and how to open all video format using jmf import javax.media.*; import javax.media.format.*; import java.io.*; import java.util.*; public class Test{ public static void main(String a[]) throws Exception{ CaptureDeviceInfo di = null; Player p = null; Vector deviceList = CaptureDeviceManager.getDeviceList(new AudioFormat("linear", 44100, 16, 2)); if (deviceList.size() > 0){ di = (CaptureDeviceInfo)deviceList.firstElement(); System.out.println((di.getLocator()).toExternalForm()); }else{ System.out.println("Exiting"); System.exit(-1); } try{ p = Manager.createPlayer(di.getLocator()); }catch (IOException e){ System.out.println(e); }catch (NoPlayerException e) { System.out.println(e); } System.out.println("Playing Started"); p.start(); } }

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  • Efficient alternatives to merge for larger data.frames R

    - by Etienne Low-Décarie
    I am looking for an efficient (both computer resource wise and learning/implementation wise) method to merge two larger (size1 million / 300 KB RData file) data frames. "merge" in base R and "join" in plyr appear to use up all my memory effectively crashing my system. Example load test data frame and try test.merged<-merge(test, test) or test.merged<-join(test, test, type="all") - The following post provides a list of merge and alternatives: How to join data frames in R (inner, outer, left, right)? The following allows object size inspection: https://heuristically.wordpress.com/2010/01/04/r-memory-usage-statistics-variable/ Data produced by anonym

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  • Slide navigation problem multiple div movement

    - by littleMan
    I have almost figured it out but still doesn't quite work the way i want it to. my problem is this part. It scrolls the first element to the left but the second element just appears and doesn't scroll does anyone know what todo here. var i = jQuery('.wikiform .wizard .view').size(); jQuery('.wikiform .navigation input[name^=Next]').click(function () { jQuery('.wikiform .wizard .view').each(function (j) { jQuery(this).animate({ marginLeft: -(current.next().width() * (i - j)) }, 750); /*line above Im having problems with ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */ current = current.next(); j++; }); }); my complete code down below test it out and see what Im doing wrong (function ($) { $.fn.WikiForm = function (options) { this.Mode = options.mode || 'CancelOk' || 'Ok' || 'Wizard'; var current = jQuery('.wikiform .view:first'); function positionForm() { jQuery('body') .css('overflow-y', 'hidden'); jQuery('<div id="overlay"></div>') .insertBefore('.wikiform') .css('top', jQuery(document).scrollTop()) .animate({ 'opacity': '0.8' }, 'slow'); jQuery('.wikiform') .css('height', jQuery('.wikiform .wizard .view:first').height() + jQuery('.wikiform .navigation').height()) .css('top', window.screen.availHeight / 2 - jQuery('.wikiform').height() / 2) .css('width', jQuery('.wikiform .wizard .view:first').width()) .css('left', -jQuery('.wikiform').width()) .animate({ marginLeft: jQuery(document).width() / 2 + jQuery('.wikiform').width() / 2 }, 750); jQuery('.wikiform .wizard') .css('overflow', 'hidden') .css('height', jQuery('.wikiform .wizard .view:first').height()); } if (this.Mode == "Wizard") { return this.each(function () { positionForm(); //alert(current.next().width()); var i = jQuery('.wikiform .wizard .view').size(); jQuery('.wikiform .navigation input[name^=Next]').click(function () { jQuery('.wikiform .wizard .view').each(function (j) { jQuery(this).animate({ marginLeft: -(current.next().width() * (i - j)) }, 750); current = current.next(); j++; }); }); jQuery('.wikiform .navigation input[name^=Back]').click(function () { }); }); } else if (this.Mode == "CancelOk") { return this.each(function () { }); } else { return this.each(function () { }); } }; })(jQuery); $(document).ready(function () { jQuery(window).bind("load", function () { jQuery(".wikiform").WikiForm({ mode: 'Wizard', speed:750, ease:"expoinout" }); }); }); <style type="text/css"> body { margin:0px; } #overlay { background-color:Black; position:absolute; top:0; left:0; height:100%; width:100%; } .wikiform { background-color:Green; position:absolute; } .wikiform .wizard { clear: both; } .wizard { position: relative; left: 0; top: 0; width: 100%; list-style-type: none; } .wizard .view { float:left; } .view .form { } .navigation { float:right; clear:left } #view1 { background-color:Aqua; width:300px; height:300px; } #view2 { background-color:Fuchsia; width:300px; height:300px; } </style> <title></title></head><body><form action="" method=""><div id="layout"><div id="header"> Header </div> <div id="content" style="height:2000px"> Content </div> <div id="footer"> Footer </div> </div> <div id="formView1" class="wikiform"> <div class="wizard"> <div id="view1" class="view"> <div class="form"> Content 1 </div> </div> <div id="view2" class="view"> <div class="form"> Content 2 </div> </div> </div> <div class="navigation"> <input type="button" name="Back" value=" Back " /> <input type="button" name="Next " class="Next" value=" Next " /> <input type="button" name="Cancel" value="Cancel" /> </div> </div>

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  • How can I fill in the blanks to display just my image?

    - by Ignacio
    <h:inputText id="email" value="#{user.user.email}" title="Email" onchange="this.form.submit()" required="true" requiredMessage="_____"> <f:validator validatorId="checkvalidemail"/> </h:inputText> <h:message for="email" styleClass="error"/> validation: String enteredEmail = (String)object; Pattern p = Pattern.compile(".+@.+\\.[a-z]+"); Matcher m = p.matcher(enteredEmail); boolean matchFound = m.matches(); if (!matchFound) { FacesMessage message = new FacesMessage(); message.setSummary("____"); throw new ValidatorException(message); and css .error { background-image: url('includes/style/delete2.png'); text-align: left; font-size: 36px; } Thank you very much Best Regards Ignacio

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  • invalid file name in matlab when using file split

    - by klijo
    here jj will be the value of FN, but the trouble is iam getting a error message ??? Error using == fopen Invalid filename. DirName = 'Samples\mattest\jj'; FileName = split('\\',DirName); [a,b] = size(FileName); FN = FileName(b); file_1 = fopen(FN,'w'); split method was found at http://www.mathworks.com/matlabcentral/fileexchange/4873 Doesnt the code seem correct ? Could someone please help me ?

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  • Debugging in visual studio 2008 freezes entire system

    - by mat690
    Any time i try to debug in visual studio 2008 my entire system will freeze whenever a breakpoint is hit. I can move the mouse around and that remains responsive but nothing i click on does anything, I can bring up the task manager but can't do anything with it and i am able to lock/unlock the machine. I tried a fix that i found via google that suggested i disable advanced text services but it didn't work. I am using visual studio 2008 with SP1 running on Windows XP Pro, asking here is my last hope before formating/reinstalling so i hope someone can help me out. I debug by running the application in debug mode, the freeze happens no matter what the project size and it seems as if it is just the entire GUI that freezes, the computer carries on working just fine i just can't do anything with it because the GUI is totaly unresponsive.

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  • Multiple layout UserControl

    - by johnm01
    Hi all, I have a UserControl that manages a lot of editable information (like text-boxes). Now I need to make a version of this control that has a different layout (from horizontal to vertical). I can expose the control, like this: public TextBox MyText { get { return myText; } set { myText = value; } } i can now manually change the location and size, but this does not give me a visual reposition of them at design time. Is there a better way of doing this ? Thanks John

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  • Undo history broken in Eclipse?

    - by Artem Russakovskii
    Is Eclipse's undo history broken? I have been using 3.1, 3.2, 3.3, and now 3.4 versions for the last few years and was always able to undo only about 20-25 changes back in history. This nonsense has cost me some lost modifications countless times when trying to revert some recent changes (if you reply with "you should commit to svn every 25 changes", I'm going to unleash dragons on you). There's a setting in Preferences-Editors-Text Editors-Undo history size and I set it to 1000 but it didn't help anything. I'm mostly using Eclipse with the Perl E.P.I.C. in the Perl Perspective, if it matters. So guys, what's the problem and how do I fix it?

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  • CSS Issue in Firefox/IE

    - by bethhilson
    I'm working on a site's CSS and am running across an issue with the body margin section. If you look at this in Firefox and then IE, you can see the line isn't lined up right in Firefox, but it is in IE. (In the black header section). Here is what I have for the body tag, It's something with the margin and I can't figure it out: body { margin: -2px; padding: 0px; background: #E7E7E7 url(images/bg01.jpg) repeat-x left top; font-family: Arial, Helvetica, sans-serif; font-size: 11px; color: #888888; } Thank you for any responses!

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  • Generating PDF results in single page only?

    - by A T
    Generating a PDF from an email (Zurb Ink templated); but am always presented with a single page PDF. Runnable test-case: from weasyprint import HTML, CSS from urllib2 import urlopen if __name__ == '__main__': html = urlopen('http://zurb.com/ink/downloads/templates/basic.html').read() html = html.replace('<p class=\"lead\">', '{0}<p class=\"lead\">'.format( '<p class=\"lead\">{0}</p>'.format("foobar " * 50) * 50)) HTML(string=html).write_pdf('foo.pdf', stylesheets=[ CSS(string='@page { size: A4; margin: 2cm };' '* { float: none !important; };' '@media print { nav { display: none; } }') ]) How do I get a multi-page PDF?

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  • link with static library vs individual object files

    - by dododo
    For a reason i want to unpack a static lib (libx.a) into individual object files (a.o b.o c.o), and specify these object files (a.o b.o c.o) in the linker input list instead of libx.a, with other linker options remaining the same. However, i have noticed the above change has resulted in quite some difference in the output executable. Basically, (a.o b.o c.o) method will result in larger output size. So what's the difference between the two methods (libx.a and individual object files)? And is there a way to work around? The GNU binutil (for and ar ld) version i'm using is 2.16.1 Thanks.

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  • How to parse a tar file in C++

    - by Brendan Long
    What I want to do is download a .tar file with multiple directories with 2 files each. The problem is I can't find a way to read the tar file without actually extracting the files (using tar). The perfect solution would be something like: #include <easytar> Tarfile tar("somefile.tar"); std::string currentFile, currentFileName; for(int i=0; i<tar.size(); i++){ file = tar.getFileText(i); currentFileName = tar.getFileName(i); // do stuff with it } I'm probably going to have to write this myself, but any ideas would be appreciated..

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  • Can I find out if the java program was launched using java or javaw

    - by saugata
    This is related to an earlier question by a different user How to detect that code is running inside eclipse IDE I noticed that eclipse always launches programs with javaw rather than java. (This does not imply a program launched with javaw was launched from eclipse). I can find the arguments passed using RuntimeMXBean RuntimemxBean = ManagementFactory.getRuntimeMXBean(); List<String> lst=RuntimemxBean.getInputArguments(); for(int i=0;i<lst.size();i++) System.out.println(lst.get(i)); But this does not tell me whether it was launched using java or javaw. Is there any way to find it out? Another related question is why does eclipse use javaw to launch programs?

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  • RichFaces Toolbargroup centering a group

    - by Jeremiah
    Hello there I am trying use a toolbar so that it has three parts part A is aligned left part B is aligned Center part C is aligned right both the right and left i can use the location attribute ... but since there is no center attribute i am not able to center part b. I can use a rich:spacer but this makes the toolbar rigid and when the screen size is reduced the toolbar gets overlapped ... is there any i can center this without the toolbar getting over lapped. Any suggestions or workarounds is welcome cheers

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  • Potential problems porting to different architectures

    - by Brendan Long
    I'm writing a Linux program that currently compiles and works fine on x86 and x86_64, and now I'm wondering if there's anything special I'll need to do to make it work on other architectures. What I've heard is that for cross platform code I should: Don't assume anything about the size of a pointer, int or size_t Don't make assumptions about byte order (I don't do any bit shifting -- I assume gcc will optimize my power of two multiplication/division for me) Don't use assembly blocks (obvious) Make sure your libraries work (I'm using SQLite, libcurl and Boost, which all seem pretty cross-platform) Is there anything else I need to worry about? I'm not currently targeting any other architectures, but I expect to support ARM at some point, and I figure I might as well make it work on any architecture if I can. Also, regarding my second point about byte order, do I need to do anything special with text input? I read files with getline(), so it seems like that should be done automatically as well.

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