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• What is the concept behind writing a cancel operation in c++?

  - by ToMan

  I'm attempting to write a cancel operation for a software download application. This application will first transfer the software to the device and then install the software on it. (These are givens I'm not allowed to change). What should the cancel operation do? When a user presses 'cancel', the application should stop transferring/installing the software immediately. Question: Since I've never written a "cancel" function, I'm wondering what are the types of things to consider when writing the code, and what are the common bugs I should expect and how to deal with them? Couldn't find anything in google so if you have some links that would be good reads I'd really appreciate it since I'm not looking for answers I'm just looking for guidelines/macro/concept help

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• Are C or C++ The Only Viable Languages for a GC

  - by user95312

  Background I have just finished writing a compiler for a functional language compiling to the JVM as a learning project. However, since I'm just doing this to learn, I thought it might be interesting to write a native backend and a RTS for it. As I've been planning out what this new backend will look like, the one point I'm stumbling on is the garbage collector. I've implemented the compiler in Haskell. But I have no desire to write the GC in Haskell since, while it may be possible, it'd suck. Question I've looked at several FOSS garbage collectors prior to posting and most of them were implemented in good old ANSI C. Is this still the most accepted choice for writing a GC nowadays? I've seen that this site tends to frown upon questions with multiple answers so I hope this will make it more specific: If some startup was writing a professional grade gc today, are the only viable choice for them C or C++? It's my first question here so please comment and let me know if this question is ill-suited for for programmers.

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• grub rescue error, [on hold]

  - by Lucas Smith

  I was trying to install a Linux OS to an partition alongside Windows 8 and Ubuntu, but I got confused and I just canceled the installation. Then I booted into Windows 8 and deleted the 20GB partition that I created. When I restarted the computer I got stuck at the following error message: error: no such partition grub rescue> I don't know what to do. I do not want to lose any data. Please help! Sorry for not selecting any answers, I overrited Linux with Windows XP and then repaired the Master Boot Record for Windows 8 and deleted XP, I'm now staying at Windows 8.

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• Wordpress Website issue [duplicate]

  - by David

  This question already has an answer here: What are the best ways to increase a site's position in Google? 18 answers I have my website in WordPress. Now the problem is if I search any keywords in Google related to website webpages then it doesn't show any webpage result in web results. But if I search in Google blog result then It is showing my webpages in Google blog results. I want to know what is problem with my webpages. Why they are coming in Google blog search instead of Google web search?

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• How to disable password prompt for default keyring?

  - by user110431

  I'm using Ubuntu 12.10 64Bit. How to disable ubuntu enter password for keyring default to unlock prompt ? Every time I open Chrome or ubuntu software center, this annoying window jump out. I have being searching online for a long time, most of the answers are like delete ~/.gnome2/keyring XX , but I don't have such directory or go to password and keys , disable some option, but this window is empty in my case, very strange , even I add a new password keyring, it is still empty. None of these methods works in my case. I will be very appreciate if you can help

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• Blank desktop after login

  - by Alex

  Today my 14.04 updated itself not requiring a reboot. After a while I rebooted because of other reasons and then I was pleasantly surprised by a blank screen. I have tried everything I could think about including Reinstalled compiz, unity, ubuntu-desktop, xorg Reinstalled and then removed the nvidia driver So far nothing has worked. Except for one little thing: my cairo-dock is showing. And that's all. I tried with Unity doesn't load, no Launcher, no Dash appears, but none of the answers there helped me. I also tried removing my ~/.Xauthority file and it still doesn't work. Does anybody know what else I could try? UPDATE: sudo dpkg-reconfigure xserver-xorg sudo service lightdm stop sudo service lightdm start When I run that code and then login again the icons on the desktop are displayed but the menu and the launcher are still not there. Also, when I try to run an application from CTRL + ALT + F1 such as dconf reset -f /org/compiz/ it says Cannot autolaunch D-Bus without X11 $DISPLAY I can only run applications with export DISPLAY=:0

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• Why dd is not a reliable command to write bootable .iso files to USB thumb drive?

  - by Samik

  As the answers here indicate Ubuntu .iso s are not expected to boot if copied with dd to a USB thumb drive. Now my question is why is so that some Linux distributions have the option to directly write their bootable .iso file to a thumb drive with dd but some (read Ubuntu) have not(for Ubuntu I think it has to be converted to .img first). Is it for some architectural difference in .isos? Or is it due to any limitation of dd itself?I don't know if it is off-topic here. I can move it to a more proper place if the community thinks so or suggests one. Some explanation would be appreciable.

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• Is client side JavaScript capable of replicating the Node.JS module loading system?

  - by jt0dd

  I like the Node.JS style of JavaScript, where I can write all of my functionalities into smaller files and then require those neatly from within my code. I'm even thinking about trying to write a framework to mimic that behavior in client-side JS. My goal would be to implement the module loading system as accurately as possible - See Module docs. For require(), I can use things detailed in answers to this question, most notably JQuery's $.getScript(). It seems to me that other aspects of the module loading system should be possible as well. So I'm asking more experienced programmers here first, before I waist my time: Is there something that I'm missing that's going to cause such an attempt to fail miserably, or can this be successfully done?

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• Should I sacrifice code succintness to ensure the narrowest variable scope? [duplicate]

  - by David Scholefield

  This question already has an answer here: Is the usage of internal scope blocks within a function bad style? 3 answers In many languages (e.g. both Perl and Java - which are the two languages I work most with) it is possible to narrow the scope of local variables by declaring them within a block. Although it adds extra code length (the opening and closing block braces), and possibly reduces readability, should I create blocks purely to narrow the scope of variables to the statements that use the variables and to uphold the principle of narrowest scope or does this sacrifice succinctness and readability just to unnecessarily uphold an agreed 'best practice' principle? I usually declare local variables to functions/methods at the start of the function to aid readability, but I could not do this, and just create blocks throughout the function and declare the variables throughout the code - within those blocks - to narrow their scope.

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• April Edition of the Oracle E-Business CRM Support Newsletter Available

  - by Oracle_EBS

  The April Edition of the Oracle E-Business Customer Relationship Management (CRM) Support Newsletter Document ID  1320611.1 is now available on My Oracle Support. Highlights of the April Edition include: Upgrading Customizations within EBS New Format for 12.1.3 Documentation E-Business Suite Recommended Upgrades Communities Update Directed and Useful content targeted by CRM Product Available EBS CRM Webcasts …and More! It is also worth noting that the My Oracle Support Communities, http://communities.oracle.com, are always available for quick answers to your questions.   Also, please always feel free to write us at [email protected] with any feedback on the CRM newsletter, communities or any other feedback you wish to share.

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• EAV - is it really bad in all scenarios?

  - by Giedrius

  I'm thinking to use EAV for some of the stuff in one of the projects, but all questions about it in stackoverflow end up to answers calling EAV an anti pattern. But I'm wondering, if is it that wrong in all cases? Let's say shop product entity, it has common features, like name, description, image, price, etc., that take part in logic many places and has (semi)unique features, like watch and beach ball would be described by completely different aspects. So I think EAV would fit for storing those (semi)unique features? All this is assuming, that for showing product list, it is enough info in product table (that means no EAV is involved) and just when showing one product/comparing up to 5 products/etc. data saved using EAV is used. I've seen such approach in Magento commerce and it is quite popular, so may be there are cases, when EAV is reasonable?

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• How to conduct A/B split testing with AdSense?

  - by None

  Ok so I have decided to A/B test my AdSense ads. I have run a few tests, but I don't know what conclusion to draw and how to keep track of things. Some specific questions: If I have 2 test units, 1 wins. I test that with a new and so on. How do I find if say the fifth one did better than the first one? How do I keep track of things? Do I let the variables independent of each other, because they certainly are not. In real life, font size can affect CTR even if the colors are different. I can test blue color with red color, and then test Arial font with Georgia, but how do I know which combination is the best? This would result in way too many test units. I tried Googling a lot, but I could not find answers to these questions.

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• Need a moderated celebrity chat solution

  - by chchrist

  Hi all, I am searching for a moderated celebrity chat. Every week a celebrity from my country will answer questions from users who join the room. I want to have a moderator who will filter those questions and the decide which to show publicly in the chat. Only the moderator must be able to chat with the celebrity. The answers provided from the celebrity will be published to the room Is there a solution like this? I prefer free by I'd paid too.

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• How to transfer domain from Godaddy to another provider

  - by licorna

  I'm currently using godaddy for all of my company domains, and I'm very unsatisfied with their service, specially with their site, so we are trying to migrate those domains to another provider. The question is, How do I transfer my domains to another domain registrar? I'm not talking about transferring domain records (A, MX...) but to use the same domains with another provider, and redo all the configuration again. For example, one of our blogs is hosted in Slicehost and we feel very confortable with their record editing tool. As I have read prowebmasters I can see other people not very satisfied with Godaddy service. Thanks! edit: Thanks for the answers, they were all very informative.

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• What options are there for splitting UI layout from code logic using a markup language?

  - by Daenyth

  What tools similar to GWT's UIBinder exist in other languages? By this I mean a system where you can define your UI layout in a markup language (preferably html+css) and attach the functionality to the layout using the code. I'm most interested in anything for python, but answers in other languages would interest me as well. I'm interested because the benefits of having a non-programmer work directly on the layout without needing to touch the code and adjust a bunch of UI toolkit method calls is very productive. I'm aware of Flex for flash, but is there anything else out there? What search terms might I use to find such frameworks? I've looked around but I haven't found anything concrete.

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• Exalytics Webcast - Extreme Analytics Without Limits

  - by Rob Reynolds

  Event Date: October 18, 2012 Event Time: 11 a.m. PT / 2 p.m. ET If your organization is like most, you grapple with an ongoing struggle to obtain timely and relevant information from your enterprise systems. So, while you may have the data needed to answer key questions, the volume, complexity, and dispersal of that data makes getting those answers tough. Attend this Webcast to learn how the combination of Oracle Exalytics In- Memory Machine and Oracle’s market leading analytic applications enables you to go beyond the traditional boundaries of data analysis and get the insight you need from massive volumes of data – all at the speed of thought. See how you can benefit from running your analytic applications on Oracle Exalytics to: Lower TCO Improve Operational Decision Making and Enhance Competitive Advantage Deliver Speed-of-thought Analysis – Anytime, Anywhere Register today. Learn how Oracle Business Analytics can move your business ahead. Register Here

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• Booting from USB only

  - by vivek

  I am a newbie on linux and dont understand many things unless given a line by line instructions. I am trying but linux does take some getting used to. I have installed ubuntu from live usb stick. Now I cannot boot my system without the usb being plugged in. There are answers whereby certain commands need to be run. For any command that I run with sudo (prefix) the terminal asks me for a password which I dont know. What do I do? How do I fix it such that the booting happens without usb being plugged in. So far I have just been booting from USB. Please help a recent converted from Windows. Thanks all

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• i have xp partitioned and formatted fat32 it says it needs to be bootable to install ubuntu how do i do that? [duplicate]

  - by Rob Bailey

  This question already has an answer here: How do I install Ubuntu? 4 answers I have partitioned the hard drive and formatted it fat 32 as it is only 16gig. I have just read that I should not partition the hard drive so I have deleted the partition, I noticed that if i re-partition it my options would be NTFS, Fat32 or exfat. I tried to install ubuntu 12.10 but it flashed up something along the lines of the partition is not bootable and it must be for ubuntu to install. I know my copy works as a friend installed it over his copy of windows and it works perfect, I have ubuntu on my flashdrive, I want to run it along side xp.

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• Should I use the factory design pattern for every class?

  - by Frog

  I've been writing a website in PHP. As the code becomes more complex, I keep finding problems that can be solved using the factory design pattern. For example: I've a got a class Page which has subclasses HTMLPage, XMLPage, etc. Depending on some input I need to return an object of either one of these classes. I use the factory design pattern to do this. But as I encounter this problem in more classes, I keep having to change code which still initiates an object using its constructor. So now I'm wondering: is it a good idea to change all code so that it uses the factory design pattern? Or are there big drawbacks? I'm currently in a position to change this, so your answers would be really helpful.

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• Best Resources for learning SQL? [closed]

  - by Simon

  Possible Duplicate: Good Books and videos for absolute beginner to SQL I have landed a role as a product engineer for a web based product. A big part of the product is allowing its users the ability to create queries with SQL to pull in business information from their back end databases. I know the very basics of SQL and need to spend some time getting a better grasp on SQL. I have the tutorial from w3schools on my ToDo list, but was hoping to get some answers that point me to good resources for learning SQL. I have no preference - I can buy a book (SQL For Dummies?), or online resources, online videos, audio, etc.

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• Learning to program on punchcards

  - by Plutor

  I'd like to try programming with punch cards once in my life. How can I do this? I'm in my 30s, and grew up entirely in the PC era, programming on computers with screens and keyboards. I want to experience the way my father and grandfather used to work. I imagine the hardware (and probably the cards themselves) are no longer manufactured. Are there any universities or museums with functioning punch card readers anymore? I'm in Boston, but I'm willing to travel to do this. I asked MetaFilter, and I got some mixed answers (along with a lot of "no, don't do this" nay-saying). I did get a pointer to the Retro-Computing Society Of Rhode Island, but I haven't received a response to my email to them yet.

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• What is the reason for high power consumption in 12.04?

  - by tom

  I haven't seen this exact question posted or any related answers, so I'm re-posting. Here is the problem: After upgrading to Ubuntu 12.04 Precise Pangolin, my t420s laptop idles above 20 watts (right now with only Chrome running, I'm using 25.4 W) I had a similar problem with Ubuntu 11.10, but after much tweaking the power consumption came down < 10 W on idle. The primary culprit to the 11.10 problem was supposedly fixed by default in 12.04. So my question is, what is happening now? Computer: Lenovo Thinkpad t420s, with Intel i5-2520M @2.5 Ghz - 2x 4gb ram - disk 0 HITACHI 320 Gb - disk 1 SATA SSD 128 Gb

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• What should NOT be included in comments? (opinion on a dictum by the inventor of Forth)

  - by AKE

  The often provocative Chuck Moore (inventor of the Forth language) gave the following advice (paraphrasing): "Use comments sparingly. Programs are self-documenting, with a modicum of help from mnemonics. Comments should say WHAT the program is doing, not HOW." My question: Should comments say WHY the program is doing what it is doing? Update: In addition to the answers below, these two provide additional insight. 1: Beginner's guide to writing comments? 2: http://programmers.stackexchange.com/a/98609/62203

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• How do I completly remove software? [closed]

  - by Dustin

  Possible Duplicate: Why are the hidden settings-folders not deleted when purging an application? Ok I have 8GB on my desktop dual booting win 7. I installed a few games, assualtcube, tremolous, and spring. But I had removed them using 'remove --purge' and only to find they are still lingering and purge does not well truly purge them. I need them completely gone and not secretly hogging space when I purged them. How can i completely remove software, like it is gone and not going to take any more of my precious space? Shrinking 7 and growing Ubuntu is not an answer I am accepting, i want to know how to completely remove software. Thank you for your time and your answers.

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• Utility Objects–Waitfor Delay Coordinator (SQL Server 2008+)

  - by drsql

  Finally… took longer than I had expected when I wrote this a while back, but I had to move my website and get DNS moved before I could post code… When I write code, I do my best to test that code in as many ways as necessary. One of the last types of tests that is necessary is concurrency testing. Concurrency testing is one of the most difficult types of testing because it takes running multiple processes simultaneously and making sure that you get the correct answers multiple times. This is really...(read more)

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