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• How can I compare two lists in python and return matches.

  - by tehryan

  I want to take two lists and find the values that appear in both. a = [1, 2, 3, 4, 5] b = [9, 8, 7, 6, 5] returnMatches(a, b) would return [5], for instance.

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• Does the Liskov Substitution Principle apply to subtype which inherited from abstract class?

  - by A.A.

  loosely speaking, Liskov Substitution Principle states that a derived class can be substitute in place of the base class without affecting the user. In the case when the base class is an abstract class, which means no user is using an instance of the base class, does the Liskov inheritance restrictions still apply to the derived class?

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• how to calculate power consumption on an Android mobile that uses wifi?

  - by Marco

  Hello, I have implemented a routing protocol on an Android 1.6 mobile that uses wireless (ad-hoc) network in order to exchange messages. Now I would like to evaluate it under an energy consumption point of view, the base would be to try to calculate the energy wasted to transmit a single packet, do anybody has any idea how to do that? Software/hardware solutions are welcome! Thanx :)

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• What's the easiest way to assign a string returned from the server to a javascript string?

  - by powerboy

  The following does not work: var js_str= '<?php echo $str_from_server; ?>'; The problem is that, $str_from_server can contain any characters. If it contains single quotes or line breaks or others, the above code will break. And I do not have access to the server-side code. What's the easiest way to "escape" the contents of $str_from_server into a javascript string, and then it can be restored later?

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• xdebug profiler output strange results

  - by nic28

  I'm using xdebug to profile some PHP code on Windows and using WinCacheGrind/Webgrind to analyse the output, but I'm getting some strange results. Specifically, the total cumulative time for a single method is greater than 100%! How is it possible that more time is spent executing this function's code and all the functions that it calls than the total time it took to execute the whole script? What am I missing here?

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• How do you revert (roll back) to an earlier version of a committed file in CVS

  - by CodeLizard

  Let's take for example a single file committed in CVS with the following history. test.cpp rev 1.1 rev 1.2 rev 1.3 How do I revert to rev 1.2 discarding the changes in 1.3 and then continue to make modification from that point on?

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• Making many network shares appear as one

  - by jimbojw

  Givens: disk is cheap, and there's plenty lying around on various computers around the corporate intranet redundant contiguous large storage volumes are expensive Problem: It would be fantastic to have a single entry point (drive letter, network path) that presents all this space as one contiguous filesystem, effectively abstracting the disk and network architecture from the paths presented to users. Does anyone know how to implement such a solution? I'm open to Windows and non-windows solutions, free and proprietary.

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• how to save settings of eclipse?

  - by aks

  I am using Rational software Architect(RSA) which is like eclipse .Now i have done lots of settings under windows preferences. Now want to export this settings and then apply those settings directly to another instance of RSA installed on another machine. How do i export and the import this and the import?The way to do this in eclipse will also work.

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• Play video in videoplayer using ffmpeg

  - by AndroidOptimist

  I am trying to play an video using ffmpeg. For this i referred ffmpeg-sample link wherein i can play my video successfully. Here the video is getting played as a bitmap image. Now i would like to play my video in mediaplayer by pressing a single play button with ffmpeg code. I googled this but i couldn't find an answer. Can u please help me in playing the video in player using ffmpeg (not using bitmaps).

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• Python - copy by reference

  - by qba

  Is there any possibility to copy variable by reference no matter if its int or class instance? My goal is to have two lists of the same objects and when one changes, change is visible in second. In other words i need pointers:/

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• class ProfilePresenter < ActionView::Base | url_for doesn't work. why?

  - by Totty

  class ProfilePresenter < ActionView::Base def initialize super url_for # i got: You have a nil object when you didn't expect it! # The error occurred while evaluating nil.url_for end end url_for doesn't work. why? i make a new instance like this ProfilePresenter.new

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• [[alloc] init] as a factory method

  - by iter

  I want to initialize an instance of one of the subclasses of a superclass depending on the arguments to init: [[Vehicle alloc] initWithItinerary: shortWay]; // returns a bicycle [[Vehicle alloc] initWithItinerary: longWay]; // returns a car I can't find examples of code like this. I wonder if this is not idiomatic in Objective C, or I simply am not looking in the right places.

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• HTTP 403.9 - Access Forbidden: Too many users are connected

  - by sdsd

  hi I have created an application in VStudio. It ran nicely in debugging mode, but my computer became slower and slower as I worked until it finaly became frozen. after I manualy restarted it, the app wasn't running any more in debug and I get this execption in the browser. Only I am connected right now to the app. I have restarted the computer so there coudn't be any instance of a client connected I have removed and reinstalled the IIS what is wrong?

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• Concurrent processes do not utilize all available CPU

  - by metdos

  I run some processes on an EC2 cc2.8xlarge instance which has 32 virtual processors. For some type of processes, when I run 16 processes on parallel, all of them use 100% of CPU cycles. But for other type of processes, they are not using 100% CPU and they finish considerably slower than a single thread. There is no time spend on IO and all data is served from memory. Do you have any idea about the reason of this problem?

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• java.util.Random zero argument enquiry

  - by deerb

  I am trying to code a game following instructions contained in an OU TMA document which read: In the constructor, write code to assign a new instance of Random to ran which you should create using the Random class's zero argument constructor Will this code work? Random ran = new Random(0) ; I am a relative newbie to Java, and I don't understand exactly what the instructions mean

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• I need to programmatically remove a batch of unique constraints that I don't know the names of.

  - by Bill

  I maintain a product that is installed at multiple locations which as been haphazardly upgraded. Unique constraints were added to a number of tables, but I have no idea what the names are at any particular instance. What I do know is the table/columnname pair that has the unique constraints and I would like to write a script to delete any unique constraint on these column/table combinations. This is MSSQL 2000 and later. Something that works on 2000/2005/2008 would be best!

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• how to count NULL categories in one SQL question

  - by grzes

  hi, i have a blog application were Post belongsTo Category and Category hasMany Post Post can have a Category or not - in latter case NULL value is present in Post.category_id field. Now i would like to have following category count with single SQL query category|post_count -------------- PHP | 2 JavaScript | 4 SomeOtherCat | 1 NULL | 3 The clue here is that i also want to count posts without category (NULL row above). Is it posibble with one SQL query?

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• If I'm running my App Engine app on localhost, will I not see a value for X-AppEngine-Country?

  - by Bartholomew

  According to the Release Notes: All user request have an X-AppEngine-Country header which contains the ISO-3166-1 alpha-2 country code for the user, based on the IP address of the client request. My app is running on localhost with the 1.5.1 Java release which contains the X-AppEngine-Country header but I don't seem to be receiving any value for this header in my requests. Do I have to deploy the app to a production instance to test this feature?

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• How to gracefully handle the SIGKILL signal in Java

  - by Begui

  How do you handle clean up when the program receives a kill signal? For instance, there is an application I connect to that wants any third party app (my app) to send a finish command. What is the best say to send that finish command when my app has been destroyed with a kill -9?

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• How can I run Gcov over an installed Cocoa application?

  - by Joe

  I have a Cocoa application which uses an installer. I want to be able to run code coverage over the code (after it has been installed). This is not the usual unit-test scenario where a single binary will run a suite of tests. Rather, the tests in question will interact with the UI and the app back-end whilst it is running, so I ideally want to be able to start the application knowing that Gcov is profiling it and then run tests against it. Any ideas?

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• best alternative to in-definition initialization of static class members? (for SVN keywords)

  - by Jeff

  I'm storing expanded SVN keyword literals for .cpp files in 'static char const *const' class members and want to store the .h descriptions as similarly as possible. In short, I need to guarantee single instantiation of a static member (presumably in a .cpp file) to an auto-generated non-integer literal living in a potentially shared .h file. Unfortunately the language makes no attempt to resolve multiple instantiations resulting from assignments made outside class definitions and explicitly forbids non-integer inits inside class definitions. My best attempt (using static-wrapping internal classes) is not too dirty, but I'd really like to do better. Does anyone have a way to template the wrapper below or have an altogether superior approach? // Foo.h: class with .h/.cpp SVN info stored and logged statically class Foo { static Logger const verLog; struct hInfoWrap; public: static hInfoWrap const hInfo; static char const *const cInfo; }; // Would like to eliminate this per-class boilerplate. struct Foo::hInfoWrap { hInfoWrapper() : text("$Id$") { } char const *const text; }; ... // Foo.cpp: static inits called here Foo::hInfoWrap const Foo::hInfo; char const *const Foo::cInfo = "$Id$"; Logger const Foo::verLog(Foo::cInfo, Foo::hInfo.text); ... // Helper.h: output on construction, with no subsequent activity or stored fields class Logger { Logger(char const *info1, char const *info2) { cout << info0 << endl << info1 << endl; } }; Is there a way to get around the static linkage address issue for templating the hInfoWrap class on string literals? Extern char pointers assigned outside class definitions are linguistically valid but fail in essentially the same manner as direct member initializations. I get why the language shirks the whole resolution issue, but it'd be very convenient if an inverted extern member qualifier were provided, where the definition code was visible in class definitions to any caller but only actually invoked at the point of a single special declaration elsewhere. Anyway, I digress. What's the best solution for the language we've got, template or otherwise? Thanks!

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• Can freetextbox display links that were not explicitly added?

  - by Joe

  I would like to display links that are pasted in as links rather than text but freetextbox does not seem to do this. For instance, if somebody pastes in http://www.stackoverflow.com it looks like a link but shows up only as text. Do I need to convert this myself or is there a setting in the editor to take care of this?

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• is this class thread safe?

  - by flash

  consider this class,with no instance variables and only methods which are non-synchronous can we infer from this info that this class in Thread-safe? public class test{ public void test1{ // do something } public void test2{ // do something } public void test3{ // do something } }

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• VC++ 2010 include/lib path

  - by tm1rbrt

  Is there a place to set header and library path for ALL projects in VC2010 express? When i set them they seem to only apply to a single project (eg i have to set them everytime i start a new project).

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• How can I tell if a ManualResetEvent is signaled or non-signaled?

  - by jbraz

  I want to check to see if an instance of ManualResetEvent is signaled before starting a thread. How can I do this?

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