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Articles indexed in March 2010

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  • Constant expression with custom object

    - by nils
    I'm trying to use an instant of a custom class as a template parameter. class X { public: X() {}; }; template <class Foo, Foo foo> struct Bar { }; const X x; Bar<X, x> foo; The compiler states that x cannot appear in a constant expression. Why that? There is everything given to construct that object at compile time.

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  • Multithreading or task parallel library

    - by Bruce Adams
    I have an application which performs 30 independent tasks simultaneously using multithreading, each task retrieves data over http, performs a calculation and returns a result to the ui thread. Can I use tpl to perform the same tasks? Does tpl create 30 new threads and spread them over all the available cores, or does it just split the tasks over the available cores and use one thread per core? Will there be a performance boost using tpl over multithreading in this case?

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  • Proper way to set object instance variables

    - by ensnare
    I'm writing a class to insert users into a database, and before I get too far in, I just want to make sure that my OO approach is clean: class User(object): def setName(self,name): #Do sanity checks on name self._name = name def setPassword(self,password): #Check password length > 6 characters #Encrypt to md5 self._password = password def commit(self): #Commit to database >>u = User() >>u.setName('Jason Martinez') >>u.setPassword('linebreak') >>u.commit() Is this the right approach? Should I declare class variables up top? Should I use a _ in front of all the class variables to make them private? Thanks for helping out.

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  • What is the exact problem with multiple inheritance?

    - by Totophil
    I can see people asking all the time whether multiple inheritance should be included into the next version of C# or Java and C++ folks, who are fortunate enough to have this ability, say that this is like giving someone a rope to eventually hang themselves. What’s the matter with the multiple inheritance? Are there any concrete samples?

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  • How to deploy http://code.google.com/p/dyuproject/ into app engine

    - by portoalet
    Hi, I am trying to use openid/hybrid in app engine, but so far, no luck. No success with openid4java (because it creates socket etc), and no luck with dyuproject either. How do it deploy dyuproject into my java appengine? I just could not understand the different structure of the code in http://dyuproject.googlecode.com/files/dyuproject.appspot.com-source-2009-10-08.zip It is just so different than the default new google web application. Many thanks.. I have been struggling the whole week

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  • What are the pre-requisites to become a Business Developer

    - by T.Raghavendra
    I am not sure if this is the right portal, But i believe many entrepreneurs are available here. I wanted to know how can someone get in to business development. what are the factors that are necessary if the person has no MBA degree. is it possible to get into such profession. I mean is it just the fact you must know how to write RFP, or estimates. Understanding client requirements and getting them the best available solution. Please guide me as I am interested, with 5+ years of industry experience is it possible to move to different domain.

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  • How to force restart a Windows box using VBScript?

    - by tloach
    I'm trying to find a way to force Windows to reboot, and I am running into issues. I've tried Set OpSysSet = GetObject("winmgmts:{authenticationlevel=Pkt," _ & "(Shutdown)}").ExecQuery("select * from Win32_OperatingSystem where "_ & "Primary=true") for each OpSys in OpSysSet retVal = OpSys.Reboot() next I've also tried using the shutdown -f -r command, and in both cases I sometimes get no response, and if I try again I get an error saying "Action could not complete because the system is shutting down" even though no matter how long I leave it it doesn't shut down, it still allows me to start new programs, and doing a shutdown -a gives the same error. How can a script be used to force Windows to reboot?

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  • Changing DBML, how to change SQL database?

    - by Robbert Dam
    Hi all, A have an app with that uses an SQL database. The application is already released, but now I'm working on an update. In the update I've added an extra column in a table of my database. I've create the database from my DMBL using DataContext.CreateDatabase() (not the other way around, as I found out to be the more common scenario later) I there a facility in LINQ in which I can update my SQL database scheme?

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  • How to communicate with "Microsoft ACPI-Compliant Embedded Controller" driver?

    - by YT
    I'd like to communicate with an Embedded Controller device in a Notebook through I/O ports 62/66. When running on XP, the communication might collide with "Microsoft ACPI-Compliant Embedded Controller" driver which does the same thing. Therefore, I’d like to know whether (and how) I can communicate with I/O ports 62/66 using this driver. In addition, any informative link about what this driver is doing and how, will be highly appreciated.

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  • Puppetmaster don't notice changes to site.pp

    - by tore-
    Hi, I've just setup a new production environment with puppet. Using 0.25.4 in client/server. Ruby is at 1.8.5, CentOS 5.4. I've made a simple manifest for configuring yum-updatesd, but the puppetmaster doesn't seem to notice changes done to site.pp: err: Could not parse for environment production: Could not match 'node' at /etc/puppet/manifests/site.pp:1 err: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not parse for environment production: Could not match 'node' at /etc/puppet/manifests/site.pp:1 Notice, it says line 1. But line 1 contains an import statement: # cat -n /etc/puppet/manifests/site.pp 1 import "update-notification" 2 3 node default { 4 include update-notification 5 update-notification::configure() 6 } I've tried to reboot the server, delete and recreate site.pp, start and stop puppetmaster and puppet, with no luck. What am I missing?

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  • Get a list/tuple/dict of *all* the arguments passed to a function?

    - by Phillip Oldham
    Given the following function: def foo(a, b, c): pass How would one obtain a list/tuple/dict/etc of the arguments passed in? Specifically, I'm looking for Python's version of JavaScript's arguments keyword or PHP's func_get_args() method. What I'm not looking for is a solution using *args or **kwargs; I need to specify the argument names in the function definition (to ensure they're being passed in) but within the function I want to work with them in a list- or dict-style structure.

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  • How to securely communicate with a database using a java applet

    - by WarmWaffles
    I have been writing web applications for quite sometime in PHP with MySQL. I always stored my database connection information into a configuration variable and connected to the database that way. A client wants a java applet for their website to communicate with their database. I'm very hesitant on this because the applet is going to be public and I am not sure how I would go about storing the database connection information. I'm paranoid that someone would decompile my application or find some way to extract my database connection information and use it maliciously. Any suggestions on how to do this securely?

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  • How to reset the value of NSInterval ?

    - by srikanth rongali
    I am writing a small game. After the completion of the game we get the previous screen. So, we can play again. But problem is that the time interval (NSTime Interval)started first time while running game is still continuing. For example the time interval of my touch when I first started game is 3.0 seconds. When again I played (not quitting the application) the time interval is 3.0 seconds + interval till the present touch ? Hoe can I make it work ? Please help me with solution for my problem.

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  • Strategy for animation a lot of LED's - thread?, UIView animations? NSOperation? (iPhone)

    - by RickiG
    Hi I have to do some different views containing 72 LED lights. I built an LED Class so I can loop through the LED's and set them to different colors (Green, Red, Orange, Blue None etc.). The LED then loads the appropriate .png. This works fine, I loop over the LED's and set them. Now I know that at some time they will need to not just turn on/off change color, but will have to turn on with a small delay. Like an equalizer. I have a 5-10 views containing the 72 LED's and I would like to achieve the above with the minimum amount of memory/CPU strain. for(LED *l in self.ledArray) { [l display:Green]; } I simply loop as shown above and inside the LED is a switch case that does the correct logic. If this were actual LED's and a microController I would use sleep(100) or similar in the loop, but I would really like to avoid stuff like that for obvious reasons. I was thinking that doing a performOnThread withDelay would really be consuming, so would UIView animation changing the alpha and NSOperation would also be a lot of lifting for a small feature. Is there a both efficient and clever way to go around this? Thanks for any inspiration given:)

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  • singleton pattern in java- lazy Intialization

    - by flash
    public static MySingleton getInstance() { if (_instance==null) { synchronized (MySingleton.class) { _instance = new MySingleton(); } } return _instance; } 1.is there a flaw with the above implementation of the getInstance method? 2.What is the difference between the two implementations.? public static synchronized MySingleton getInstance() { if (_instance==null) { _instance = new MySingleton(); } return _instance; } I have seen a lot of answers on the singleton pattern in stackoverflow but the question I have posted is to know mainly difference of 'synchronize' at method and block level in this particular case.

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  • Python RSS Feeder + Jquery RSS Reader

    - by Panther24
    I'm trying to implement an RSS Feeder in python using PyRSS2Gen and it created an XML file. Now in jQuery I'm using Google Ajax API's RSS reader and trying to read it. I get an error saying something is wrong. I'm unable to figure out the issue. I've checked some documentation but not able to get it. This is how my xml file looks: <rss version="2.0"> <channel> <title>Andrew's PyRSS2Gen feed</title> <link> http://www.dalkescientific.com/Python/PyRSS2Gen.html </link> <description> The latest news about PyRSS2Gen, a Python library for generating RSS2 feeds </description> <lastBuildDate>Fri, 26 Mar 2010 13:10:55 GMT</lastBuildDate> <generator>PyRSS2Gen-1.0.0</generator> <docs>http://blogs.law.harvard.edu/tech/rss</docs> <item> <title>PyRSS2Gen-0.0 released</title> <link> http://www.dalkescientific.com/news/030906-PyRSS2Gen.html </link> <description> Dalke Scientific today announced PyRSS2Gen-0.0, a library for generating RSS feeds for Python. </description> <guid isPermaLink="true"> http://www.dalkescientific.com/news/030906-PyRSS2Gen.html </guid> <pubDate>Sat, 06 Sep 2003 21:31:00 GMT</pubDate> </item> <item> <title>Thoughts on RSS feeds for bioinformatics</title> <link> http://www.dalkescientific.com/writings/diary/archive/2003/09/06/RSS.html </link> <description> One of the reasons I wrote PyRSS2Gen was to experiment with RSS for data collection in bioinformatics. Last year I came across... </description> <guid isPermaLink="true"> http://www.dalkescientific.com/writings/diary/archive/2003/09/06/RSS.html </guid> <pubDate>Sat, 06 Sep 2003 21:49:00 GMT</pubDate> </item> </channel> </rss> And my JS looks like this <!-- ++Begin Dynamic Feed Wizard Generated Code++ --> <!-- // Created with a Google AJAX Search and Feed Wizard // http://code.google.com/apis/ajaxsearch/wizards.html --> <!-- // The Following div element will end up holding the actual feed control. // You can place this anywhere on your page. --> <!-- Google Ajax Api --> <script src="../js/jsapi.js" type="text/javascript"></script> <!-- Dynamic Feed Control and Stylesheet --> <script src="../js/gfdynamicfeedcontrol.js" type="text/javascript"></script> <link rel="stylesheet" type="text/css" href="../css/gfdynamicfeedcontrol.css"> <script type="text/javascript"> function LoadDynamicFeedControl() { var feeds = [ {title: 'Demo', url: 'wcarss.xml' }]; var options = { stacked : false, horizontal : false, title : "" } new GFdynamicFeedControl(feeds, 'feed-control', options); } // Load the feeds API and set the onload callback. google.load('feeds', '1'); google.setOnLoadCallback(LoadDynamicFeedControl); </script> <!-- ++End Dynamic Feed Control Wizard Generated Code++ --> Can some help me and tell me what I'm doing wrong here? NOTE: Does the XML file have to be deployed? Cause currently its in my local machine and I'm trying to just call it.

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