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• iterator vs reverse_iterator

  - by Miguel Angel

  Hi, I'm using std::map to store a lot of elements (pairs of elements) and I have a "little" doubt, what is more efficient to iterate all elements over my std::map, iterator or reverse_iterator? Thank's. Salu2.

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• Singleton design pattern vs Singleton beans in Spring container

  - by Peeyush

  As we all know we have beans as singleton by default in Spring container and if we have a web application based on Spring framework then in that case do we really need to implement Singleton design pattern to hold global data rather than just creating a bean through spring. Please bear with me if I'm not able to explain what I actually meant to ask.

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• iPhone Development - CLLocationManager vs. MapKit

  - by Mustafa

  If i want to show userLocation on the map, and at the same time record the user's location, is it a good idea to add an observer to userLocation.location and record the locations, OR should i still use CLLocationManager for recording user location and use mapView.showUserLocation to show the user's current location (blue indicator)? I want to show the default blue indicator supported by the MapKit API. Also, here's a rough sample code: - (void)viewDidLoad { ... locationManager = [[CLLocationManager alloc] init]; locationManager.desiredAccuracy = kCLLocationAccuracyBest; locationManager.distanceFilter = DISTANCE_FILTER_VALUE; locationManager.delegate = self; [locationManager startUpdatingLocation]; myMapView.showUserLocation = YES; [myMapView addObserver:self forKeyPath:@"userLocation.location" options:0 context:nil]; ... } - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { // Record the location information // ... } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { NSLog(@"%s begins.", __FUNCTION__); // Make sure that the location returned has the desired accuracy if (newLocation.horizontalAccuracy <= manager.desiredAccuracy) return; // Record the location information // ... } Under the hood, i think MKMapView also uses CLLocationManager to get user's current location? So, will this create any problems because i believe both CLLocationManager and MapView will try to use same location services? Will there be any conflicts and lack of accurate/required or current data?

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• UIView animation VS core animation

  - by Tom Irving

  I'm trying to animate a view sliding into view and bouncing once it hits the side of the screen. A basic example of the slide I'm doing is as follows: // The view is added with a rect making it off screen. [UIView beginAnimations:nil context:NULL]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:0.07]; [UIView setAnimationCurve:UIViewAnimationCurveLinear]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)]; [theView setFrame:CGRectMake(-5, 0, theView.frame.size.width, theView.frame.size.height)]; [UIView commitAnimations]; More animations are then called in the didStopSelector to make the bounce effect. The problem is when more than one view is being animated, the bounce becomes jerky and, well, doesn't bounce anymore. Before I start reading up on how to do this in Core Animation, (I understand it's a little more difficult) I'd like to know if there is actually an advantage using Core Animation rather than UIView animations. If not, is there something I can do to improve performance?

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• socat usage for FIFO speed vs socket speed on localhost

  - by Fishy

  Hello, As per a suggestion on stackoverflow, to compare IPC on a single machine using a) sockets (TCP) on localhost to localhost b) using FIFOs (between Java and C) To answer (a), I used netcat to gauge transfer speed (91 MBytes/sec)[1] (b) Q: How can I test FIFO write speed using socat? My approach(where /tmp/gus is created using mkfifo on RHEL): dd if=/dev/zero of=/tmp/gus bs=1G count=1 but i get: 1073741824 bytes (1.1 GB) copied, 1.1326 seconds, 948 MB/s Does this mean writing to a FIFO ~10 times faster? Or is my experiment completely wrong ? Thank you Sporsi [1] From machine A to B across 1Gbps link, this number dropped to ~80 MBytes/sec - I expected localhost to be much higher ...

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• WCF Vs Web Services

  - by Ben

  Hi, I am about to re-release my website that i have transformed into a SilverLight Site, and was wondering if it is worth while updating the web service that it hosts into a WCF Service. The Service doesn't do too much at the moment, but i will be growing it fairly substantially. I have read a few articles on the differences between asmx web services and WCF Services and can't really see the benefits of WCF, but i am probably very wrong. Could anyone advise of the advantages of WCF and if is worth while me making the move (on the basis that you know it's a small service at the moment, but will be growing). Thanks

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• DC: Mac Developer vs iPhone Developer

  - by Khou

  http://developer.apple.com/programs/ so whats the difference between Mac Developer and iPhone Developer membership? If you signup to Mac Developer you can download the iPhone SDK anyways? so why would you sign to iphone developer?

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• Servlets vs MVC frameworks

  - by Jegan

  I very often come across this question of why we have got lots of web frameworks addressing the same or similar drawbacks. When looking deeply, I also have given thought on why JSP / Servlets is not being used after the other web frameworks (like Struts, Spring MVC etc) have shown their existence? Is it because, the latest web frameworks does most of the things on its own? provides extensive features that is not available with Servlet / JSP? or the Servlet / JSP is impotent to deliver what latest framework does? Any help in the form of responses or resources is greatly appreciated.

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• .NET Framework 4 Client Profile vs .NET Framework 3.5 Client Profile

  - by Janusz

  Currently I am targeting .NET Framework 3.5 Client profile. Under certain conditions (when .NET 1.x or 2.x is installed) the client profile is not installed and instead full version of .NET Framework 3.5. is installed. This limitation has been removed from .NET 4.0 profile - therefore its a nice improvement that significantly reduces download size on certain PCs. However, if I target application to .NET 4.0 then all the clients will have to download new framework. I think ideal scenario would be to target .NET 3.5 profile but point installer to .NET 4.0 client profile. This way PCs with 3.5 installed (65% from our tests at the moment) would be fine and the rest would install .NET 4.0. Is my thinking correct or its not feasible? Will .NET 3.5 profile application run with only .NET 4.0 profile installed? Thank you

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• WPF vs XNA to render thousands of sprites

  - by Aurélien Ribon

  Hello, I need to render thousand of ellipses linked each others with lines. What would be the best way (in terms of performances) to render it inside a WPF application. Is WPF Canvas painting a lot worse than XNA painting ? Thanks, Aurélien

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• boost serialization vs google protocol buffers?

  - by 0xC0DEFACE

  Does anyone with experience with these libraries have any comment on which one they preferred? Were there any performance differences or difficulties in using?

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• Blog - BlogPost - BlogPostComment vs Blog - Post - Comment

  - by Anton Gogolev

  Don't really know how to formulate the title, but it should be pretty obvious from the example. More specifically, what rules do you use for naming "dependent" classes. For example, Blog is a pretty descriptive name itself, but how do I deal with posts? BlogPost or Post? Clearly, first name clearly expresses that it's a "subordinate" class, but this can quickly get out of hand with BlogPostComment, BlogPostCommentAttachment, etc. Post, on the other hand, looks like an entity completely unrelated to Blog and is easier on the eye. What are your rules/best practices?

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• Drupal 6 vs Drupal 7 performance

  - by lifecoder

  Hi all. I want to start new project and stuck without idea what version to use. I have huge expirience with D6, and also one project (module developement) for D7. It looks like D7 slower, have bigger memory consumption and also have a lack of documentation by the moment. I don't need new CCK, Views and other - looks like I'll coding all features needed as modules. Is D7 have sweet parts now, or better way is develop project under D6? What way you choose for yourself, and why?

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• the best way to connect sql server (Windows authentication vs SQL Server authentication) for asp.net

  - by Brij

  I have a database and a site having forms authentication. It is working fine with VS2008. This time, I am using "Trusted_connection =True". But when it is opened from outside or directly from browser then I am getting error "Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'." I know this is due to permission. SQL server is based on windows authentication. What is the best approach to manage user to connect SQL Server? Should I enable SQL Server authentication? Let me know what to do so that it makes the production feel and there wouldn't be any problem during deployment. Note: SQL Server is installed on domain server.

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• Application threads vs Service threads

  - by zerayaqob

  What are the advantages/disadvantages in placing a lengthy network access code in a thread in an activity or a thread in a service? How would it affect the application? I am writing a streaming audio player and from what I've read so far putting the code in a service will still end up blocking the application so a new thread is needed, does anyone know if it makes more sense to put this piece of code in a service. Thanks

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• FileSystemWatcher vs Polling to watch for changes

  - by Jon Tackabury

  I need to setup an application that watches for files being created in a folder (locally or on a network drive) and I was wondering if anyone has any thoughts on whether the FileSystemWatcher or polling on a timer would be the best option. I have used both methods in the past, but not extensively. Have you run into any issues (performance, reliability... etc) with either method? I know there isn't a "right way" to do this, I'm just looking opinions.

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• WPF ControlTemplate vs UserControl

  - by PaN1C_Showt1Me

  Hi. I've recently made an UserControl, which took quite a long time, because I had to work with custom Dependency Properties and so on... Anyways, it was just a bunch of 3 controls: TextBox, Popup with Hierarchical Tree. Now I realized I could probably write a ControlTemplate only. Hence what is the benefit of using UserControl?

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• Java: notify() vs. notifyAll() all over again

  - by Sergey Mikhanov

  If one google for "difference between notify() and notifyAll()" then a lot of explanations will pop up (leaving apart the javadoc paragraphs). It all boils down to the number of waiting threads being waken up: one in notify() and all in notifyAll(). However (if I do understand the difference between these methods right), only one thread is always selected for further monitor acquisition; in the first case the one selected by the VM, in the second case the one selected by the system thread scheduler. The exact selection procedures for both of them (in general case) are not known to the programmer. What's is the useful difference between notify() and notifyAll() then? Am I missing something?

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• AlertDialog.Builder vs class to extend AlertDialog - Application size

  - by wuntee

  I am trying to figure out what is the best way to go about creating dialogs. I can either create my own Dialog class (which, to me, is more clean and organized), or I can use AlertDialog.Builder (which would be done inline, and funky looking)... What are the positivies and negatives of either implementation? The only thing I can think of is application size...

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• RDLC (VS 2010) How to access nested class or arrays on DataObjects

  - by gerard

  How can I access the TD.SubNumber property and Numbers[] on RDLC? I keep getting #Error on my expressions "=Fields!TD.Value.SubNumber" and "=Fields!Numbers.Value(0)". public class TestData { TestSubData tdata = new TestSubData(); public TestSubData TD { get { return tdata; } set { tdata = value; } } string m_Description; public string Description { get { return m_Description; } set { m_Description = value; } } int[] m_Numbers = new int[12]; public int?[] Numbers { get { return m_Numbers; } } } public class TestSubData { int x; public TestSubData() { } public int SubNumber { get { return x; } set { x = value; } } }

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• Google index vs asp.net url routing

  - by vani

  I've made the change from querystring asp.net webforms application to an url routing one. Now I'm trying to let google know that there's a new set of urls to be aware of. The G has indexed 133 out of 179 new urls sent in sitemap.xml, but the site:mistral.hr command returns the old querystring version of the links. This could partly be so because I left the functionality of the old querystring version of the site(for backwards compatibility), and haven't done any 301 redirects(nor do I know how to achieve them in my shared hosting account). The old querystring and the new url routing both point to the same Default.aspx page.

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• Optimize css vs Google page speed is messing with me

  - by The Disintegrator

  I'm using google page speed and it's telling me my css is inefficient... Very inefficient rules (good to fix on any page): * table.fancy thead td Tag key with 2 descendant selectors and Class overly qualified with tag * table.fancy tfoot td Tag key with 2 descendant selectors and Class overly qualified with tag The css rules are table.fancy {border: 1px solid white; padding:5px} table.fancy td {background:#656165} table.fancy thead td, table.fancy tfoot td {background:#767276} I want the header and footer in a different background color than the body of the table (a data table) On what grounds this is inefficient? How to make it more efficient? I will not add a class to the thead and tfoot for googles's sake.

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• libdb4.6-dev vs libdb4.7-dev

  - by routinet

  I want to install PHP 5.3 on Ubuntu Intrepid. To install apxs, I need to install libaprutil1-dev, which depends on libdb4.6-dev. When I look at installing that, apt-get wants to remove the currently installed libdb-dev and libdb4.7-dev. Any advice on how to proceed? [root@server:/usr/local] #> apt-get -s install libaprutil1-dev Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. Since you only requested a single operation it is extremely likely that the package is simply not installable and a bug report against that package should be filed. The following information may help to resolve the situation: The following packages have unmet dependencies: libaprutil1-dev: Depends: libdb4.6-dev but it is not going to be installed E: Broken packages [root@server:/usr/local] #> apt-get -s install libdb4.6-dev Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: debhelper libltdl7-dev po-debconf intltool-debian libtool courier-ssl gettext libgdbm-dev libzip1 html2text autotools-dev libmail-sendmail-perl Use 'apt-get autoremove' to remove them. Suggested packages: db4.6-doc The following packages will be REMOVED: libdb-dev libdb4.7-dev The following NEW packages will be installed: libdb4.6-dev 0 upgraded, 1 newly installed, 2 to remove and 54 not upgraded. Remv libdb-dev [4.7.25.2ubuntu1] Remv libdb4.7-dev [4.7.25-3] Inst libdb4.6-dev (4.6.21-10 Ubuntu:8.10/intrepid) Conf libdb4.6-dev (4.6.21-10 Ubuntu:8.10/intrepid)

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• Static functions vs const functions

  - by baash05

  I'm looking at a member function int funct(int x) const; And I'm wondering if static int funct(int x); would be better. If a member function doesn't use any of the member variables should it be static. Are there any things that would discourage this?

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• Symbian bluetooth vs. Windows Mobile bluetooth

  - by qwerty

  Hello, I wanna know what are the differences between Symbian OS bluetooth and Windows Mobile bluetoo? Can you explain/describe me? I did not find something clear in this case.. i wanna compare them. Thanks!

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