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  • Historical origins of Scala implicits

    - by Frank
    Scala has been called complex with its rich feature set by many of my colleagues and some even blamed all those new features of it. While most programmers are aware of the OO-features, and at least the decent ones also know about functional programming, there is one feature in particular in Scala for which I am not aware of its historical origins. Given that a major mantra of our profession is to not reinvent the wheel, I am rather confident, that Scala does not have any actual unheard-of-before features, but I stand to be corrected on this one if necessary. To get to the actual question, while I am aware of the origins of most of Scala's features I have never seen something like its implicit declarations before. Are there other (older!) languages out there which also provide this feature? Does it make sense to distinguish the different cases of implicits (as they may originate from different sources), namely implict conversions and implicit parameters?

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  • Making file in user's homedir accessible from web/webserver

    - by evident
    Hi everybody, I have a txt-file one of my user's homedir which is regularly updated there by a script. I now want to be able to access (read) this file from the web. /home/user/folder/file.txt So what I tried now is to log in as root, go into my webservers httpdocs folder /var/www/path/to/domain/httpdocs and there I tried to create a symbolic link with ln -s /home/user/foler/file.txt /var/www/path/to/domain/httpdocs/file.txt But this didn't work... I already tried changing the chmod of the symlink (which changes the ones from the original file of course) and also a chown to the user from webserver, but no matter what I tried I cannot open the file from the web or from a php-script (which is what I want to do) Can anybody help me and tell me what I need to do? What rights do I need to give? Or is there another way of achieving this?

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  • null values vs "empty" singleton for optional fields

    - by Uko
    First of all I'm developing a parser for an XML-based format for 3D graphics called XGL. But this question can be applied to any situation when you have fields in your class that are optional i.e. the value of this field can be missing. As I was taking a Scala course on coursera there was an interesting pattern when you create an abstract class with all the methods you need and then create a normal fully functional subclass and an "empty" singleton subclass that always returns false for isEmpty method and throws exceptions for the other ones. So my question is: is it better to just assign null if the optional field's value is missing or make a hierarchy described above and assign it an empty singleton implementation?

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  • How to Banish Duplicate Photos with VisiPic

    - by Jason Fitzpatrick
    You meant well, you intended to be a good file custodian, but somewhere along the way things got out of hand and you’ve got duplicate photos galore. Don’t be afraid to delete them and lose important photos, read on as we show you how to clean safely. Deleting duplicate files, especially important ones like personal photos, makes a lot of people quite anxious (and rightfully so). Nobody wants to be the one to realize that they deleted all the photos of their child’s first birthday party during a hard drive purge gone wrong. In this tutorial we’re going to show you how to go beyond the limited reach of  tools which simply compare file names and file sizes. Instead we’ll be using a program that combines that kind of comparison with actual image analysis to help you weed out not just perfect 1:1 file duplicates but also those piles of resized for email images, cropped images, and other modified images that might be cluttering up your hard drive. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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  • how to remove update repo that always fails

    - by David M. Karr
    A week or so ago I tried to add a new package repo that supposedly had a package I wanted. Unfortunately, the information about it was out of date, and I found that it fails to connect to it each time. I'd like to just remove the new repo, but I'm not sure how to do that. For context, when I update, I get this: W:Failed to fetch http://ppa.launchpad.net/geod/ppa-geod/ubuntu/dists/precise/main/source/Sources 404 Not Found [IP: 135.214.42.30 8080] , W:Failed to fetch http://ppa.launchpad.net/geod/ppa-geod/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found [IP: 135.214.42.30 8080] , W:Failed to fetch http://ppa.launchpad.net/geod/ppa-geod/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found [IP: 135.214.42.30 8080] , E:Some index files failed to download. They have been ignored, or old ones used instead.

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  • Why doesn't my graphic card software support 1280*1024?

    - by Allwar
    Hi, I have an external monitor which is an 20" 1280*1024. In windows 7 it works fine with that resolution but in ubuntu it can't. Example: In windows I connect it and activates it, done. In ubuntu I connect and the only resolution that is available is the ones my laptop screen support, 12" 1366*768. My laptop is an asus 1201n. If I force it to use 1280*1024 both screen crashes and i have to force a reboot. When I force it I only force the external monitor, the laptop is already at maximum 1366*768. I connect it throw VGA. ((The graphic card supports 1280*1024 in windows 7, #Fail)) alvar@alvars-laptop:~$ disper -l display DFP-0: HSD121PHW1 resolutions: 320x175, 320x200, 360x200, 320x240, 400x300, 416x312, 512x384, 640x350, 576x432, 640x400, 680x384, 720x400, 640x480, 720x450, 640x512, 700x525, 800x512, 840x525, 800x600, 960x540, 832x624, 1024x768, 1366x768 display CRT-0: CRT-0 resolutions: 320x240, 400x300, 512x384, 680x384, 640x480, 800x600, 1024x768, 1152x864, 1360x768

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  • Windows no longer display with proprietary ATI Catalyst drivers

    - by Insomniac
    I recently started having an issue that opening any application would would show nothing on screen. At the time I noticed it I assumed it was an incompatibility between the new 14 update so reinstalled the old 13.10 iso I used originally. I have now tried a range of ATI drivers including the latest and the exact file I installed the first time with the same results. I can only assume then that it is one of the updates applied at some point, but have no idea which one or how I would go about rolling these back or getting earlier versions of packages. Is anyone else getting this issue? The system has 2 ati 6850s installed, not in crossfire. The open source drivers work fine but I need the ATI ones for cgminer to work.

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  • How to Easily Optimize & Manage Multiple Computers with Soluto

    - by Chris Hoffman
    Soluto is a quick, simple way to optimize and manage one or more computers – it really shines for managing multiple ones. If you’re already tech support for family or friends, Soluto can save you a lot of time. We’ve written about Soluto in the past, when it was in a closed beta. Anyone can now sign up for a free Soluto account and manage up to five computers from the same account. The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos

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  • Broken keyboard shortcuts

    - by c089
    When I freshly installed maverick on my new notebook, I set up my keyboard shortcuts like this: Switch to WS 1 = Mod4+1, Move Window to WS 1 = Mod4+Shift+1, Switch to WS 2 = Mod4+2 and so on (Mod4 being the "Windows" key). But now the three-key combinations (i.e. the ones I use for "move to...") stopped working. When I go to keyboard preferences, I still see them and I can even change them to a different combination and then again to the desired one - but they won't execute the window movement afterwards :/ Any suggestions how to fix this?

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  • Are there existing FOSS component-based frameworks?

    - by Tesserex
    The component based game programming paradigm is becoming much more popular. I was wondering, are there any projects out there that offer a reusable component framework? In any language, I guess I don't care about that. It's not for my own project, I'm just curious. Specifically I mean are there projects that include a base Entity class, a base Component class, and maybe some standard components? It would then be much easier starting a game if you didn't want to reinvent the wheel, or maybe you want a GraphicsComponent that does sprites with Direct3D, but you figure it's already been done a dozen times. A quick Googling turns up Rusher. Has anyone heard of this / does anyone use it? If there are no popular ones, then why not? Is it too difficult to make something like this reusable, and they need heavy customization? In my own implementation I found a lot of boilerplate that could be shoved into a framework.

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  • Web Developer Portfolio - Role Definition

    - by GSTAR
    I'm just putting together a portfolio that lists all the websites I have developed / worked on during the past year. Now this has become quite a long list - simply because 60% of the websites I have listed are ones where I have developed certain sections of the site, or maybe re-developed a certain section of an existing site - but not actually developed the whole site. So basically you could say I made a 20-50% contribution on those particular sites. I don't want to give the false impression to a potential employer that I have actually fully developed all the sites listed on my portfolio. Therefore I am after a neat way to indicate this fact. On the websites that I have fully developed, I have put a small label next to the name which reads "Lead Developer". What would be the equivalent label to put on the sites I have partially developed, or projects where I have been amongst multiple people developing? I suppose what I'm asking is, how would you define, in 2-3 words a non-lead developer role within a project?

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  • Ubuntu One synching changed files

    - by Mark
    I have several folders in the Ubuntu1 folder and if I add a new file (on my PC oder my Mobile) the file shows up in the other device or in the online access. However, if I change one of the files (like a spreadsheet I change almost daily on my PC) Ubuntu1 is not updating the changed file. It is still the old file on the other devices. Doesn't Ubuntu1 sync changed files only new ones or do I have to change some settings? Could someone be so nice and help me? Thanks in advance! Mark PS: I am using Ubuntu 11.10 64 bit.

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  • Is it risky to install KDE on Ubuntu alongside Unity and Gnome?

    - by Vagrant232
    The last time I installed KDE and Gnome on the same OS (Opensuse 12.1), GDM and KDM started conflicting and they both stopped working properly and I was plagued with applications from both environments till the point the applications overview in gnome was flooded with useless KDE trash. Moreover, I still had parts of the KDE desktop appearing when I'm running Gnome (such as the password manager and kde fonts and some apps refused to give up the oxygen theme). If I install the plasma-desktop package on Ubuntu, am I at risk of having such issues? I just want KDE with the bare minimum number of applications; just the necessary ones to make things work. I'd rather not have dolphin installed either. Also, is it all right to install the kde-standard pack? Or should I just stick to the plasma-desktop pack?

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  • Oracle Database Customers In the News!

    - by jenny.gelhausen
    Our database customers are implementing some pretty interesting applications. Here are a few recent ones in the news: Dressbarn, Maurices and Justice Brands' Parent Company Ascena Retail Group, Inc. all using Oracle Database 11g to power their Oracle E-Business Suite 12.1 applications for growth Hotwire, Inc. Innovates Faster with Oracle Exadata Database Machine Disney Store Completes International Implementation of @OracleRetail Point of Service using Oracle Database 11g Banca Transilvania selects Oracle FLEXCUBE Universal Banking (uses #Exadata Database Machine X2-2) Shop Direct Group Selects Oracle to Support E-Commerce Growth Strategy With Oracle Retail on Oracle Database 11g Let us know your story - how are you utilizing Oracle Database? var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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  • How To Make Disposable Sleeves for Your In-Ear Monitors

    - by YatriTrivedi
    In-ear monitors are great, until the rubber sleeves stop being comfortable. Here’s a quick and cheap way to make disposable ones using foam ear plugs so you can stay comfortable while listening. Latest Features How-To Geek ETC Macs Don’t Make You Creative! So Why Do Artists Really Love Apple? MacX DVD Ripper Pro is Free for How-To Geek Readers (Time Limited!) HTG Explains: What’s a Solid State Drive and What Do I Need to Know? How to Get Amazing Color from Photos in Photoshop, GIMP, and Paint.NET Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Lakeside Sunset in the Mountains [Wallpaper] Taskbar Meters Turn Your Taskbar into a System Resource Monitor Create Shortcuts for Your Favorite or Most Used Folders in Ubuntu Create Custom Sized Thumbnail Images with Simple Image Resizer [Cross-Platform] Etch a Circuit Board using a Simple Homemade Mixture Sync Blocker Stops iTunes from Automatically Syncing

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  • IS it ok to use REST for CRUD operations?

    - by l0l0l0l0l
    Recently I moved to Laravel and I was surprised on how good setting the controllers as RESTful is, it made routes and my code cleaner. I'm kinda new on web development and never used REST before since all my clients' projects are basically CRUD operations. Are there any cool buzzword to this "approach" or I'm just stupid for doing it? I don't plan to follow any REST patterns, just to make my life easier and code cleaner. Basically just GET/POST, the other ones are not native anyway so (emulated on hidden form value).

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  • Open source projects, how to choose?!

    - by Dhaivat Pandya
    I would like to join an open source project since I think I am good enough at programming to progress onto reading others code and to modify it. But the proble mis, how would I choose an open source project to work on? I know many languages and chief ones that I am good are python, C++ (not really very good at C, the lack of object orientation is difficult for me) and Java. For c++, I am proficient wit Qt. I would like to start with something that isn't huge, and hasn't reached a phase where the bugs are so complicated it would take me a month to understand what affects the bug. Any suggestions? At the current time, I don't use any libraries in either of the mentioned libraries that I would need to modify (AFAIK).

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  • Will dolphins die if I use REST "as CRUD"?

    - by l0l0l0l0l
    Recently I moved to Laravel and I was surprised on how good setting the controllers as RESTful is, it made routes and my code cleaner. I'm kinda new on web development and never used REST before since all my clients' projects are basically CRUD operations. There's any cool buzzword to this "approach" or I'm just stupid for doing it? I don't plan to follow any REST patterns, just to make my life easier and code cleaner. Basicallly just GET/POST, the other ones are not native anyway so (emulated on hidden form value).

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  • Microsoft BUILD 2013 Day 1&ndash;Keynote

    - by Tim Murphy
    Originally posted on: http://geekswithblogs.net/tmurphy/archive/2013/06/27/microsoft-build-2013-day-1ndashkeynote.aspx This one is going to be a little long because the keynote was jam-packed so bare with me. The keynote for the first day of BUILD 2013 was kicked off by Steve Balmer.  He made it very clear that Microsoft’s focus is on accelerating its time to market with products and product updates.  His quote was that “Rapid release” is the new norm.  He continued by showing off several new Lumias that have been buzzing around the internet for a while and announce that Sprint will now be carrying the HTC 8XT and Samsung ATIV. Balmer is known for repeating words or phrase for affect.  This time it was “Rapid release, rapid release” and “Touch, touch, touch, touch, touch, …”.  This was fun, but even more fun was when he announce that all attendees would receive an Acer Iconia 8” tablet. SCORE! The next subject Balmer focused on is new apps.  The three new ones were Flipboard, Facebook and NFL Fantasy Football.  I liked the first two because these are ones that people coming from other platforms are missing.  The NFL app is great just because it targets a demographic that can be fanatical.  If these types of apps keep coming than the missing app argument goes away. While many Negative Nancy’s are describing Windows 8.1 as Windows 180 Steve Balmer chose to call it a “refined blend” as in a coffee that has been improved with a new mix.  This includes more multi-tasking options and leveraging Bing straight throughout the entire ecosystem. He ended this first section by explaining that this will also bring more Bing development opportunities to the community. Steve Balmer was followed by Julie Larson-Green who spent her time on stage selling us on Windows 8 all over again from my point of view.  Something that I would not have thought was needed until I had listened to some other attendees who had a number of concerns and complaints.  She showed a number of new gestures that will come with Windows 8.1, and while they were cool I was left wondering if they really improved the experience.  I guess only time will tell. I did like the fact that it the UI implementation to bring up “All Apps” now mirrors that of Windows Phone.  The consistency is a big step forward that I hope to see continue.  The cool factor went up from there as she swiped content from a desktop (mega-tablet) to the XBox One.  This seamless experience I believe is what is really needed for any future platform to be relevant. I was much more enthused by the presentation of Antoine Leblond who humbled us by letting us know that there are 5k new API.  How that can be or how anyone would ever use all of them is another question.  His announcement was that the Visual Studio 2013 preview would be available today along with the Windows 8.1 bits.  One of the features of VS2013 that he demonstrated is the power consumption profiler.  With battery life being a key factor with consumer consumption devices this is a welcome addition. He didn’t limit his presentation to VS2013 features though.  He showed how the Store has been redesigned to enable better search and discoverability of apps and how Win 8.1 can perform multiple screen scales depending on the resolution of the device automatically.  The last feature he demoed was the real time video streaming API which he made sure we understood by attaching a Surface to a little robot.  Oh, but there was one more thing.  Antoine and Julie announce that all attendees would also be getting Surface Pros.  BONUS! How much more could there be?  Gurdeep Singh Pall was about to pile on.  He introduced us to Bing as a platform (BaaP?).  He said if they (Microsoft) could do something with and API that is good 3rd party developers can do something that is dynamite and showed us some of the tools they had produced.  These included natural user interface improvements such as voice commands that looked to put Siri to shame.  Add to that 3D, OCR and translation capabilities and the future looks to be full of opportunities. Balmer then came out to show us one last thing.  Project Spark is a game design environment that will be available for Windows 8.1, XBox 360 and XBox One.  All I can say is that if my kids get their hands on this they are going to be able to learn some of what dad does in a much more enjoyable way. At the end of it all I was both exhausted and energized by what I saw.  What could they have possibly left for the day 2 keynote?  I hear it will feature Scott Hanselman.  If that is right we are in for a treat.  See you there. del.icio.us Tags: BUILD 2013,Windows 8.1,Winodws Phone,XAML,Keynote,Bing,Visual Studio 2013,Project Spark

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  • How to write a network game? [closed]

    - by Tom Wijsman
    Based on Why is so hard to develop a MMO?: Networked game development is not trivial; there are large obstacles to overcome in not only latency, but cheat prevention, state management and load balancing. If you're not experienced with writing a networked game, this is going to be a difficult learning exercise. I know the theory about sockets, servers, clients, protocols, connections and such things. Now I wonder how one can learn to write a network game: How to balance load problems? How to manage the game state? How to keep things synchronized? How to protect the communication and client from reverse engineering? How to work around latency problems? Which things should be computed local and which things on the server? ... Are there any good books, tutorials, sites, interesting articles or other questions regarding this? I'm looking for broad answers, but specific ones are fine too to learn the difference.

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  • CCUserDefault, iOS/Android and game updates

    - by Luke
    My game uses cocos2d-x and will be published on iOS platform first, later on Android. I save a lot of things with CCUserDefault (scores, which level was completed, number of coins taken, etc...). But now I have a big doubt. What will happen when the game will receive its first update? CCUserDefault uses an XML file stored somewhere in the app storage space. This file is created and retained until one uninstalls the app. I am wondering what happens when the app is updated. Will the old XML file be maintained? Because if not, how should I handle app updates (updates in the sense that 2, 3 or more new level packages will be added, but the informations about the old ones, like scores, which level was finished and which not, number of coins, etc., need absolutely not to be lost)?

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  • Can't access Ubuntu's shared folders from Windows 7

    - by endolith
    In Ubuntu Maverick, I've shared some folders using the Nautilus "Sharing Options" GUI. I can see them from Windows 7, but when I try to access them (from Windows) it asks for a username and password. No matter what I enter, it won't let me in. How do I configure this to share normally? Update: I've found that some of the shared folders let me in, but others don't. Of the ones that do, some of their subfolders do, others don't, etc. How can I investigate what's causing this?

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  • Unable to install Nvidia drivers

    - by Tazzer
    a few days ago I installed ubuntu 11.10 on my friends computer. Despite all of our efforts we are unable to open the default unity and it will only open the 2d interface. I have been told in the IRC chat room that we need to install the graphics card drivers(nvidia geforce 420.) When I check the additional drivers app it doesn't show any to install. I tried installing the ones from the nvidia website but no luck, I also forgot to mention. I don't know if it means anything but he has a 64 bit computer and it is ubuntu 11.10 64bit.

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  • After upgrade: what's this envelope systray icon, and how do I get rid of it?

    - by David
    I've just upgraded from 13.04 to 13.10 and everything seems to be running fine. I have a couple new icons in my systray, though, and one of them -- the envelope icon -- is a mystery to me: It looks like a chat notifier (clicking it gives "Available", "Away", "Busy", etc., indicators) but I don't use Pidgin (never have), or it could be an email indicator but I don't use Thunderbird (never have). There's nothing else I can see (left- or right-clicking) that identifies it. I'd like to get rid of it, but "Startup applications" only lists the ones I have optionally added, and this is not among them. Any help appreciated!

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  • Now Instagram lets you record and share 15 seconds video with awesome filters

    - by Gopinath
    Instagram is one of the most popular photo sharing applications and it is very popular for amazing filters that turn an ordinary photo in to an incredible one. Today Instagram extended the filters and sharing options to videos. With the latest version of Instagram application for iOS/Android you can record videos, apply filters and share them. Recording and sharing videos on Instagram is much similar to photos and. You can capture videos up to 15 seconds and there are 13 filters to choose for processing. Wondering why the limit is at 15 seconds? Pundits are saying that TV ads are in general 15 seconds and Instagram is preparing for video ads in near future. Anyways within hours of video sharing features, Instagram is flooded with short videos and the Explore section has very interesting ones to browse through. Just like photos, you can share the captured videos to your Twitter, Facebook and other social stream from Instagram.

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