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• How common are circular references? Would reference-counting GC work just fine?

  - by user9521

  How common are circular references? The less common they are, the fewer hard cases you have if you are writing in a language with only reference counting-GC. Are there any cases where it wouldn't work well to make one of the references a "weak" reference so that reference counting still works? It seems like you should be able to have a language only use reference counting and weak references and have things work just fine most of the time, with the goal of efficiency. You could also have tools to help you detect memory leaks caused by circular references. Thoughts, anyone? It seems that Python uses references counting (I don't know if it uses a tracing collector occasionally or not for sure) and I know that Vala uses reference counting with weak references; I know that it's been done before, but how well would it work?

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• How much C/C++ knowledge is needed for Objective-C/iPhone development?

  - by BFree

  First, a little background. I'm a .Net developer (C#) and have over 5 years experience in both web development and desktop applications. I've been wanting to look into iPhone development for some time now, but for one reason or another always got side tracked. I finally have a potential project on the horizon, and I'm now going full steam ahead learning this stuff. My question is this: I haven't done any C/C++ programming since my schooling days, I've been living in managed land ever since. How much knowledge if any is needed to be successful as an iOS developer? Obviously memory management is something that I'll have to be conscious about (although with iOS 5 there seems to be something called ARC which should make my life easier), but what else? I'm not just talking about the C API (for example, in order to get the sin of a number, I call the sin() function), that's what Google is for. I'm talking about fundamental C/C++ idioms that the average C# developer is unaware of.

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• Why don't smart phones have an auto-forget password feature? [closed]

  - by Kelvin

  Storing passwords to external services (e.g. corporate email servers) on smart phones is very insecure, since phones are more easily stolen. Has any vendor implemented a feature to only cache a password in memory for a limited amount of time? After the time period has elapsed, the app would ask for the password again. EDIT: I should've clarified - I'm aware that many (most?) users are lazy and want to just "set it and forget it". The always-remember feature will probably always be present. I was curious about an option to enable auto-forget for the security-conscious.

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• Should I tell a departed coworker about their "sev 1" defect?

  - by noahz

  I had a co-worker leave our company recently. Before leaving, he coded a component that had a severe memory leak that caused a production outage (OutOfMemoryError in Java). The problem was essentially a HashMap that grew and never removed entries, and the solution was to replace the HashMap with a cache implementation. From a professional standpoint, I feel that I should let him know about the defect so he can learn from the error. On the other hand, once people leave a company, they often don't want to hear about legacy projects that they have left behind for bigger and better things. What is the general protocol for this sort of situation?

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• Find Waldo with Mathematica

  - by Jason Fitzpatrick

  If you’re looking for a geeky (and speedy) way to find Waldo, of the Where’s Waldo? fame, this series of Mathematica scripts makes it a snap. Over at Stack Overflow, programmer Arnoud Buzing shares a clever bit of Mathematica-based coding that analyzes a Where’s Waldo? drawing and finds the elusive Waldo. Hit up the link below to see the distinct steps of analysis with accompanying photos. How Do I Find Waldo with Mathematica? [via Make] How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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• Launching a URL from an OOB Silverlight Application

  So I'm working on this code browser mostly to help me with my fading memory. In the app I want to be able to launch a url. So I do my normal thing and put a line of code that looks like this:System.Windows.Browser.HtmlPage.Window.Navigate(new Uri(ThisURI), "_blank");I was agast when I realized that this didn't work, for that matter it didn't even blow... grr... but with a bit of research I found that the hyper link button worked so a ended up making a little class like this:public class MyHyperLink...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Looking for an old classic book about Unix command-line tools

  - by Little Bobby Tables

  I am looking for a book about the Unix command-line toolkit (sh, grep, sed, awk, cut, etc.) that I read some time ago. It was an excellent book, but I totally forgot its name. The great thing about this specific book was the running example. It showed how to implement a university bookkeeping system using only text-processing tools. You would find a student by name with grep, update grades with sed, calculate average grades with awk, attach grades to IDs with cut, and so on. If my memory serve, this book had a black cover, and was published circa 1980. Does anyone remember this book? I would appreciate any help in finding it.

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• choppy streaming audio

  - by user88503

  I could use some help troubleshooting choppy streaming audio. The problem is jerky playback regardless of audio or video with audio. Both Chromium and Firefox have the problem, however files played directly on the machine with Rhythmbox sound just fine. I'm running 12.04 LTS on a C2D T9300. Most of the audio problems others ask about seem to be hardware related, so the following information might be relevant. sudo lshw -c multimedia *-multimedia description: Audio device product: 82801H (ICH8 Family) HD Audio Controller vendor: Intel Corporation physical id: 1b bus info: pci@0000:00:1b.0 version: 03 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=snd_hda_intel latency=0 resources: irq:48 memory:f8400000-f8403fff

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• Edubuntu boot problem on dual boot PC

  - by trptplyr

  When booting Edubuntu on a dual boot PC with Windows 7, the last message that I get is "Restoring resolver state" [Ok]. I then press the Enter key, some other messages come up and go away too quickly to notice what they say, and then the system shuts down. Windows 7 works fine. My system is an older Dell Inspiron 9400 laptop with 3Gb usable memory. This all started happening after attempting to upgrade to the next version of Edubuntu, but was not allowed to because I didn't have enough space in my partition to allow for it. I'm unsure whether that has anything to do with the problem.

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• Why did the team at LMAX use Java and design the architecture to avoid GC at all cost?

  - by kadaj

  Why did the team at LMAX design the LMAX Disruptor in Java but all their design points to minimizing GC use? If one does not want to have GC run then why use a garbage collected language? Their optimizations, the level of hardware knowledge and the thought they put are just awesome but why Java? I'm not against Java or anything, but why a GC language? Why not use something like D or any other language without GC but allows efficient code? Is it that the team is most familiar with Java or does Java possess some unique advantage that I am not seeing? Say they develop it using D with manual memory management, what would be the difference? They would have to think low level (which they already are), but they can squeeze the best performance out of the system as it's native.

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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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• Does it make a difference if I declare variables inside or outside a loop in Java?

  - by Puckl

  Does it make a difference if I declare variables inside or outside a loop in Java? Is this for(int i = 0; i < 1000; i++) { int temporaryValue = someMethod(); list.add(temporaryValue) } equal to this (with respect to memory usage)? int temporaryValue = 0; for(int i = 0; i < 1000; i++) { temporaryValue = someMethod(); list.add(temporaryValue) } And what if the temporary variable is for example an ArrayList? for(int i = 0; i < 1000; i++) { ArrayList<Integer> array = new ArrayList<Integer>(); fillArray(array); // do something with the array }

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• Which is the best non-java, dynamic, programming language to build attractive GUIs?

  - by VeeKay

  I am well acquainted with java and groovy but somehow I am not intrigued by the performance or looks of swing based applications that are developed on the same. So I want to learn and know about THE best alternate dynamic programming language (coz I am looking for little bit of luxury while writing code by not willing to fiddle with pointers, memory handling, static typing difficulties etc) to develop attractive cross platform GUIs. To be precise, when I say attractive I mean support for elegant translucent windows and nicer components (not the flashy adobe stuff). Can you please suggest me a programming language that manages to fit into this?

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• Render 2D textures on a 3D object's face

  - by www.Sillitoy.com

  I am not familiar with 3D graphics, and I'd like to know the right way to render some 2D figures on different points of a wider face of a 3D object. My 3D object is just a cube representing a poker table. I have a 2D png for players' placeholders, and I'd like to render these figures on the 3D object where needed. An alternative solution would be to render the whole face with a big picture containing all the placeholders figures. However, it would be a waste of memory and thus less efficient. What do you suggest?

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• Roll Your Own Flexi-Ties to Secure and Store Frequently Used Cables

  - by Jason Fitzpatrick

  If you’re looking for an easy way to hang up or tidy frequently used cables, these DIY soft ties are durable, resuable, and easy to make. Soft ties ties are metal wire ties coated in rubber; people use them for everything from securing computer cables to shaping garden plants. Instructables user Bobzjr wanted a lot of them but couldn’t find anyone that sold bulk roles of the soft tie material. To that end he did a little exploring at the hardware store and found the perfect combination of wire and rubber to roll his own. Hit up the link below for more information on his DIY soft tie project. Roll Your Own Flexi-Ties (Soft Twist Ties) [Instructables] How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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• Sound issue in Lubuntu

  - by jvsa90

  I'm recently having a problem in my Lubuntu deskptop: sound through the speakers doesn't seem to work. The funny thing is: it works when I plug in my earphones. I've tried to unmute everything with pavucontrol and alsamixer, but everything seems to be OK. $ sudo aplay -l **** Liste der Hardware-Geräte (PLAYBACK) **** Karte 0: Intel [HDA Intel], Gerät 0: HDA Generic [HDA Generic] Sub-Geräte: 0/1 Sub-Gerät #0: subdevice #0 $ lspci -v | grep -A7 -i "audio" 00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02) Subsystem: Acer Incorporated [ALI] Device 034a Flags: bus master, fast devsel, latency 0, IRQ 44 Memory at 58200000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: snd_hda_intel Kernel modules: snd-hda-intel Can anyone guess what's happening? It has worked until recently and it definitely works in my Windows partition.

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• Unable to turn on seamless mode in VirtualBox

  - by user11658

  I'm not able to switch to Seamless Mode in VirtualBox with Ubuntu 10.04 or 9.10 as guest OS's. I have tried the seamless mode with XP as guest OS, and it works absolutely fine. The host OS is Windows 7. I have in-built Via/S3G Unichrome Pro IGP graphics, and I have allocated 30 MB out of 64 MB of graphics memory. I've also 1.5 GB of RAM. I also tried installing Guest Additions but it still didn't work. VirtualBox version is 4.0.4r70112. How can I get the seamless mode to work? Please help!

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• What is the good way of sharing specific data between ViewModels

  - by voroninp

  We have IAppContext which is injected into ViewModel. This service contains shared data: global filters and other application wide properties. But there are cases when data is very specific. For example one VM implements Master and the second one - Details of selected tree item. Thus DetailsVm must know about the selected item and its changes. We can store this information either in IAppContext or inside each concerned VM. In both cases update notifications are sent via Messenger. I see pros and cons for any of the approaches and can not decide which one is better. 1st: + explicitly exposed shared proerties, easy to follow dependencies - IAppContxt becomes cluttered with very specific data. 2nd: the exact opposite of the first and more memory load due to data duplication. May be someone can offer design alternatives or tell that one of the variants is objectively superior to the other cause I miss something important?

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• Isn't class scope purely for organization?

  - by Di-0xide

  Isn't scope just a way to organize classes, preventing outside code from accessing certain things you don't want accessed? More specifically, is there any functional gain to having public, protected, or private-scoped methods? Is there any advantage to classifying method/property scope rather than to, say, just public-ize everything? My presumption says no simply because, in binary code, there is no sense of scope (other than r/w/e, which isn't really scope at all, but rather global permissions for a block of memory). Is this correct? What about in languages like Java and C#[.NET]?

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• Installer hangs at blinking dots

  - by Aldrin

  I've got a problem. I've tried booting it from a 4gb FlashDrive many times and yet, it'll just show me blinking dots. I've tried the options (booting from first drive, trying ubuntu without installing, help, test memory). I cant! I've also tried Ubuntu 11.10 but the turns out the same. Additional specs: First HDD, 2 partitions, C: and E: by Windows. Second HDD, 2 partitions, F: and G: by Windows. First HDD: 40Gb, Second HDD: 32Gb. I've made the Second HDD blank and plan to install Ubuntu there. Any help will do. I've tried both of the ISO images of both Linux Distros, but it didn't work. Both of them results to these. HELP "Registered protocol family 1", then "_", Boot from first hard drive Cannot load a ramdisk with an old kernel image.

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• Creating a new variable versus assigning an existing one

  - by rwallace

  Which is more common, creating a new variable versus assigning an existing variable (field, array element etc - anything that syntactically uses the assignment operator)? The reason I ask is that I'm designing a new language, and wondering which of these two operations should get the shorter syntax. It's not intended to be a pure functional language, or the question wouldn't arise, so I'd ideally like to count usage across large existing code bases in procedural and object-oriented languages like C, C++ and Java, though as far as I can see there isn't an easy way to do this automatically, and going by memory and eyeball, neither is obviously more common than the other.

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• How many VBOs should I use and should I keep a copy of their data?

  - by CSharpie

  Firstofall, I am sorry if my question is to broad. I am developing a tile based game and switched from those gl.Begin calls to using VBOs. This is kind of working allready, I managed to render a hexagonal polygon with a simple shader applied. What I am not sure is, how to implement the "whole" tile concept. Concrete the questions are: Is it better to create 1 VBO for a single tile and render it n-Times in every different position, or render one huge VBO that represents the whole "world" Depending on the answer above, what is the best way to draw a "linegrid". Overlay with the same vbo using the respecting polygon.mode , or is there a way to let the shader to this? How would frustum-culling or mousepicking work then, do i need to keep the VBO-data in memory?

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• How do I create a big multiplayer world in UDK?

  - by Dorpe

  I want to create a big multiplayer world in UDK and I'm having a few difficulties. I created the biggest terrain possible but then any terrain related action I do takes forever. However, I've seen videos of people make same size terrain and working without a problem. My pc is strong enough, so maybe someone can tell me what I'm doing wrong. I want to make it even bigger then the biggest terrain size, so I was thinking of doing level streaming but then I read that streaming is working server side which means if I have a player on every terrain all terrains will still be loaded and I want to save as much memory possible so it will work well online. Thanks for any help you can give.

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• In a 2D tile-based game, how should NPCs and tiles reference each other?

  - by lezebulon

  I'm making a tile engine for 2D games (seen from the top). Basically the world is composed of a grid of tiles. Now I want to put for instance NPCs that can move on the map. What do you think is best: 1) each tile has a pointer to the NPC that is on its tile, or a NULL pointer 2) having a list of NPCs, and they have the coordinates of the tile they are on. 3) something else? 1) is faster for collision detection but it would use much more memory space and it is slower to find all NPCs in a map. 2) is the opposite. thanks

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• Oracle????????????????~BI/DWH????????(1)

  - by Yusuke.Yamamoto

  Oracle Database ???BI???????????????????????????????????????????????????????????????????????????????????? Oracle Database 11gR2 ??????????????????? ??????????(03:54)????????????? BI????????????(Oracle Database ??????????) Enterprise Manager ??SQL??????????????????????? ?????????????????????????????? BI????????????(Oracle Database ???????????/In-Memory Parallel Execution ???) Enterprise Manager ??SQL???????????????????????? ??????????????Oracle GRID Center ??????????????? ????????????????????????? ????????DWH????????????????·???????? ???? ???????????????!! Oracle Database??????? ??????|??????????? Oracle Enterprise Manager|??????????? DWH(?????????)??·??

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