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  • The best way to have a pointer to several methods - critique requested

    - by user827992
    I'm starting with a short introduction of what i know from the C language: a pointer is a type that stores an adress or a NULL the * operator reads the left value of the variable on its right and use this value as address and reads the value of the variable at that address the & operator generate a pointer to the variable on its right so i was thinking that in C++ the pointers can work this way too, but i was wrong, to generate a pointer to a static method i have to do this: #include <iostream> class Foo{ public: static void dummy(void){ std::cout << "I'm dummy" << std::endl; }; }; int main(){ void (*p)(); p = Foo::dummy; // step 1 p(); p = &(Foo::dummy); // step 2 p(); p = Foo; // step 3 p->dummy(); return(0); } now i have several questions: why step 1 works why step 2 works too, looks like a "pointer to pointer" for p to me, very different from step 1 why step 3 is the only one that doesn't work and is the only one that makes some sort of sense to me, honestly how can i write an array of pointers or a pointer to pointers structure to store methods ( static or non-static from real objects ) what is the best syntax and coding style for generating a pointer to a method?

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  • What is the aim of this email? Is this a ping/sping? [closed]

    - by mplungjan
    Hi, I received this spam in my catch-all. As a webmaster of the domain it was sent to, I am really curious what the reason for this mail is. It was sent to a non-existent user "tania" on my domain - here I used mydomain.zzz - what do the sender want to achieve? Since many mail servers have stopped backscattering, not getting a bounce would not mean anything, would it? And if this is off topic, where inb the StackExchange WOULD it be on topic? Delivered-To: [email protected] Received: (qmail 8015 invoked from network); 27 Jan 2011 02:32:47 -0000 Received: from unknown (HELO p3pismtp01-021.prod.phx3.secureserver.net) ([10.6.12.26]) (envelope-sender <[email protected]>) by smtp35.prod.mesa1.secureserver.net (qmail-1.03) with SMTP for <[email protected]>; 27 Jan 2011 02:32:47 -0000 X-IronPort-Anti-Spam-Result: At4FAAlnQE1GVjtCVGdsb2JhbACWXo4gCwEWCA0YJLwyhU8EhRc Received: from mx.dt3ls.com ([70.86.59.66]) by p3pismtp01-021.prod.phx3.secureserver.net with ESMTP; 26 Jan 2011 19:32:47 -0700 Received: from 70.86.59.66 by mx.dt3ls.com (Merak 8.9.1) with ASMTP id JXF39710 for <[email protected]>; Wed, 26 Jan 2011 17:31:10 -0500 Return-Path: [email protected] Status: Message-ID: <20110126173109.4d9d6c3f2b@1c3c> From: "Tech Support" <[email protected]> To: <[email protected]> Subject: Information, as instructed. Date: Wed, 26 Jan 2011 17:31:09 -0500 X-Priority: 3 X-Mailer: General-Mailer v.3 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Quote: I give it to you not that you may remember time, but that you might forget it now and then for a moment and not spend all your breath trying to conquer it. Because no battle is ever won he said. They are not even fought. The field reveals to a man his own folly and despair, and victory is an illusion of philosophers and fools. William Faulkner The Sound and the Fury

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  • mdadm: brakes boot due to "is not ready yet or not present" error

    - by BarsMonster
    This is so damn frustrating :-| I've spent like 20 hours on this nice error, and seems like dozens of people over Internet too, and no clear solution yet. I have non-system RAID-5 of 5 disks, and it's fine. But during boot up it says that "/dev/md0 is not ready yet or not present" and asks to press 'S'. Very nice for Ubuntu Server - I have to bring monitor and keyboard to go next. After this system boots and it's all fine. md0 device works, /proc/mdstat is fine. When I do mount -a - it mounts this array without errors and works fine. As a dumb and shameful workaround I added noauto in /etc/fstab, and did mounting in /etc/rc.local - it works fine then. Any hints how to make it work properly? fstab: UUID=3588dfed-47ae-4c32-9855-2d69df713b86 /var/bigfatdisk ext4 noauto,noatime,data=writeback,barrier=0,nobh,commit=5 0 0 mdadm config: It is autogenerated: # mdadm.conf # # Please refer to mdadm.conf(5) for information about this file. # # by default, scan all partitions (/proc/partitions) for MD superblocks. # alternatively, specify devices to scan, using wildcards if desired. DEVICE partitions # auto-create devices with Debian standard permissions CREATE owner=root group=disk mode=0660 auto=yes # automatically tag new arrays as belonging to the local system HOMEHOST <system> # instruct the monitoring daemon where to send mail alerts MAILADDR CENSORED # definitions of existing MD arrays ARRAY /dev/md/0 metadata=1.2 bitmap=/var/md0_intent UUID=efccbeb6:a0a65cd6:470dcdf3:62781188 name=LBox2:0 # This file was auto-generated on Mon, 10 Jan 2011 04:06:55 +0200 # by mkconf 3.1.2-2

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  • ROI in choosing a CMS solution

    - by Tio
    At the company I work for we need a CMS. The question is, what to choose, for me I think the best solution is to develop one of our own, but we ( my boss and I ), talked about using Drupal. But my boss is completely non-technical, and want's to take a lot of shortcut's which for programming is utterly bad. Too many shortcut's ( and that's why just last Friday we had a bug on one of our systems that caused a lot of panic ). So I'm trying to investigate on the ROI of using already existing CMS solutions VS developing our own customized CMS ( based on a open source library or not ). So that I can sell this to my boss. I'm almost sure that developing a customized CMS is the best for our small company. After a search on google I found this: Choose between a commercial, open source, or customized CMS, but the link is from 2003, it has some truth's, but the world changed a lot from 2003. But I can't seem to find anything else about it. I've developed my own CMS, so I know it's not the most easy thing to do, and that it takes time. Can someone give me any tips? EDIT: With CMS I mean Content Management System, to manage the webpages of our clients.

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  • New "delay" keyword for JavaScript

    - by Van Coding
    I had a great idea for a new javascript keyword "delay", but I don't know what I can do to bring it to the new specification. Also I want to know what you guys think about it and if it's even realistic. What does the delay keyword ? The delay keyword does nothing more than stop the execution of the current stack and immediately continues to the next "job" in the queue. But that's not all! Instead of discarding the stack, it adds it to the end of the queue. After all "jobs" before it are done, the stack continues to execute. What is it good for? delay could help make blocking code non-blocking while it still looks like synchronous code. A short example: setTimeout(function(){ console.log("two"); },0); console.log("one"); delay; //since there is currently another task in the queue, do this task first before continuing console.log("three"); //Outputs: one, two, three This simple keyword would allow us to create a synchronous-looking code wich is asynchronous behind the scenes. Using node.js modules, for example, would no longer be impossible to use in the browser without trickery. There would be so many possibilites with such a keyword! Is this pattern useful? What can I do to bring this into the new ECMAscript specification? Note: I asked this previously on Stack Overflow, where it was closed.

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  • "Oracle Coherence 3.5" Book - My Humble Review

    - by [email protected]
      After reviewing the book in more detail I say again that it is a great guide for sure. Lots of important concepts that sometimes can be somewhat confusing are deeply reviewed, including all types of caching schemes and backing maps, and the cache topologies with their corresponding performances and very useful "When to use it?" sections. Some functionalities that are very desirable or used a lot are reviewed with examples and best practices of implementation, including: Data affinity Querying Pagination Indexes Aggregations Event processing, listening and triggering Data persistence Security Regarding the networking and architecture topics, Coherence*Extend is exhaustively reviewed, including C++ and .NET clients, with very good tips and examples, even including source codes. Personally, I am also glad to see that the address providers (<address-provider> tag), new feature in Coherence 3.5 which is a way to programmatically provide well-known addresses in order to connect to the cluster, is mentioned on the book, because it provides new functionalities to satisfy some special configuration requirements for example: Provide a way to switch extend nodes in cases of failure Implement custom load balancing algorithms and/or dynamic discovery of TCP/IP connection acceptors Dynamically assign TCP address and port settings when binding to a server socket Another very interesting and useful section is the "Coherent Bank Sample Application", which is a great tutorial, useful to understand how Coherence interacts with third party products establishing a clear integration with them, including the use of non-Oracle products like MS Visual Studio.  

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  • Chainloading GRUB2 from BURG

    - by WindowsEscapist
    I have an old PC with Puppy Linux in addition to Ubuntu and Windows XP. THis creates a LOT of menu entries (all of which I would like to keep): Ubuntu 10.04 Ubuntu Recovery Mode Memtest x86 Memtest Serial Windows XP Pro Precise Puppy Linux Precise Puppy TORAM Puppy 4.3.1 Puppy 4.3.1 TORAM Plop Boot Manager (for booting to USB, PC doesn't have BIOS option). Now, in my fancy shiny laptop I've gotten really attached to BURG, and would like a setup where I have a Windows icon, an Ubuntu icon, and an arrow that chainloads GRUB2 so that I can boot from USB or run Puppy if need be (all these entries will obviously not fit into the BURG theme I use, Lightness). The problem is, GRUB2 can't install the the beginning of a partition like it used to be able to (I am reluctant to specify andything with --force at the end), at least, without warning that warn: This is a BAD idea!. So I'm kind of at a loss here. I can't see how the folding option would work, because all of those other options would have the same icon once I unfolded (Lightness is non-text-based). If I do embed GRUB using grub-install /dev/sdax --force, how do I chainload it with BURG? Is there another way?

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  • Failed to fetch *.deb Size mismatch, then packages with unmet dependencies [solved]

    - by user113907
    I recently bought the wonderfully looking and reviewed Amnesia The Dark Descent and I'm trying to install it. The first time I tried to download it, I had to stop in the middle of the download (may have broken something). The second time I tried to download, at the end of the download it gave me the following error: Failed to fetch https://private-ppa.launchpad.net/commercial-ppa-uploaders/amnesia/ubuntu/pool/main/a/amnesia/amnesia_1.2.1-0ubuntu2_i386.deb Size mismatch Now, whenever I try to download it, it gives me this error: The following packages have unmet dependencies: amnesia: Depends: libalut0 (>= 1.0.1) but it is not going to be installed Depends: libc6 (>= 2.4) but 2.15-0ubuntu10.3 is to be installed Depends: libfontconfig1 (>= 2.8.0) but 2.8.0-3ubuntu9.1 is to be installed Depends: libfreetype6 (>= 2.2.1) but 2.4.8-1ubuntu2 is to be installed Depends: libgcc1 (>= 1:4.1.1) but 1:4.6.3-1ubuntu5 is to be installed Depends: libopenal1 (>= 1:1.13) but 1:1.13-4ubuntu3 is to be installed Depends: libsdl1.2debian (>= 1.2.10-1) but 1.2.14-6.4ubuntu3 is to be installed Depends: libstdc++6 (>= 4.1.1) but 4.6.3-1ubuntu5 is to be installed Depends: libxft2 (> 2.1.1) but 2.2.0-3ubuntu2 is to be installed Depends: zlib1g (>= 1:1.1.4) but 1:1.2.3.4.dfsg-3ubuntu4 is to be installed I already searched the net and ran a few command line commands. Ex: sudo dpkg --configure -a sudo apt-get install -f Or configure the software packages to download from Main instead of the local UK server. But I'm really not figuring out a solution. I have a fresh install of the latest LTS (12.04). The only non-standard thing so far is that I installed gnome-shell (?) because I really can't stand Unity. Help would be much appreciated. I am currently more than entertained enough with World of Goo and Command & Conquer, but I will want to play Amnesia in the close future.

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  • Modelling work-flow plus interaction with a database - quick and accessible options

    - by cjmUK
    I'm wanting to model a (proposed) manufacturing line, with specific emphasis on interaction with a traceability database. That is, various process engineers have already mapped the manufacturing process - I'm only interested in the various stations along the line that have to talk to the DB. The intended audience is a mixture of project managers, engineers and IT people - the purpose is to identify: points at which the line interacts with the DB (perhaps going so far as indicating the Store Procs called at each point, perhaps even which parameters are passed.) the communication source (PC/Handheld device/PLC) the communication medium (wireless/fibre/copper) control flow (if leak test fails, unit is diverted to repair station) Basically, the model will be used as a focus different groups on outstanding tasks; for example, I'm interested in the DB and any front-end app needed, process engineers need to be thinking about the workflow and liaising with the PLC suppliers, the other IT guys need to make sure we have the hardware and comms in place. Obviously I could just improvise in Visio, but I was wondering if there was a particular modelling technique that might particularly suit my needs or my audience. I'm thinking of a visual model with supporting documentation (as little as possible, as much as is necessary). Clearly, I don't want something that will take me ages to (effectively) learn, nor one that will alienate non-technical members of the project team. So far I've had brief looks at BPMN, EPC Diagrams, standard Flow Diagrams... and I've forgotten most of what I used to know about UML... And I'm not against picking and mixing... as long as it is quick, clear and effective. Conclusion: In the end, I opted for a quasi-workflow/dataflow diagram. I mapped out the parts of the manufacturing process that interact with the traceability DB, and indicated in a significantly-simplified form, the data flows and DB activity. Alongside which, I have a supporting document which outlines each process, the data being transacted for each process (a 'data dictionary' of sorts) and details of hardware and connectivity required. I can't decide whether is a product of genius or a crime against established software development practices, but I do think that is will hit the mark for this particular audience.

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  • UPDATE FOR BI PUBLISHER ENTERPRISE 10.1.3.4.2 NOVEMBER 2011

    - by Tim Dexter
    It's Friday, that means its patch release time. Why do we do this to ourselves, 'we'll release on Friday!' It might 11.59 on Friday but by golly we'll have released on Friday. I can remember a release of BIP years ago that for some reason we went for 12/31 as a release date ... were we mad? I seem to remember we made it but talk about ridiculous pressure! The latest 10g rollup is out in the wild and available from Oracle support. A bug fixing rollup but worth getting to and know that support will want you to get to it and re-test before going forward on an SR. One simple but very useful fix or enhancement:[Cause of the bug] @ ================== @ Customer reports that despite the clock being shown, end users are clicking @ on the View button repeatedly as the initial generation is taking some time.   @ If the button were to be grayed out then  this would prevent the users @ requesting the report more than  once.  Repeated requests are causing a @ system overload and as this is their Production  instance this is extremely @ important to the customer. @ . @ [The Fix] @ ========= @ Added the logic to disable the button after the user clicks on the "view" @ button and re-enable it when the report is loaded. I told a group of customers once that they have a headache and we have a non-steroidal anti-inflammatory drug, alright, I actually said 'aspirin'. This little gem of a fix helps relieve another little headache that our aspirin was causing. The patch number for all this BIP pain killing is 13399232, enjoy!

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  • Precision loss when transforming from cartesian to isometric

    - by Justin Skiles
    My goal is to display a tile map in isometric projection. This tile map has 25 tiles across and 25 tiles down. Each tile is 32x32. See below for how I'm accomplishing this. World Space World Space to Screen Space Rotation (45 degrees) Using a 2D rotation matrix, I use the following: double rotation = Math.PI / 4; double rotatedX = ((tileWorldX * Math.Cos(rotation)) - ((tileWorldY * Math.Sin(rotation))); double rotatedY = ((tileWorldX * Math.Sin(rotation)) + (tileWorldY * Math.Cos(rotation))); World Space to Screen Space Scale (Y-axis reduced by 50%) Here I simply scale down the Y value by a factor of 0.5. Problem And it works, kind of. There are some tiny 1px-2px gaps between some of the tiles when rendering. I think there's some precision loss somewhere, or I'm not understanding how to get these tiles to fit together perfectly. I'm not truncating or converting my values to non-decimal types until I absolutely have to (when I pass to the render method, which only takes integers). I'm not sure how to guarantee pixel perfect rendering precision when I'm rotating and scaling on a level of higher precision. Any advice? Do I need to supply for information?

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  • Unable to start VMWare Workstation after upgrade to 13.04

    - by pst007x
    After upgrading to 13.04 I am unable to start VMWorkstation. I get the following message: Before you can run VMware, several modules must be compiled and loaded into the running kernel. Kernel Headers 3.8.0-19-generic Kernel headers for version 3.8.0-19-generic were not found. If you have installed them in a non-default path you can specify the path below. Does anyone have any idea what to do next? Ubuntu 13.04 64bit If I direct the path to: /usr/src/linux-headers-3.8.0-19-generic I get the following message: C header files matching your running kernel were not found. Thanks Additional: As suggested I run this in terminal: cd /lib/modules/$(uname -r)/build/include/linux sudo ln -s ../generated/utsrelease.h sudo ln -s ../generated/autoconf.h sudo ln -s ../generated/uapi/linux/version.h However, now I get the following: Before you can run VMware, several modules must be compiled and loaded into the kernel CANCEL / INSTALL I INSTALL, the window closes and nothing happens.... Any ideas? ADDITIONAL: I installed this: sudo apt-get install open-vm-tools open-vm-tools-dev open-vm-dkms open-vm-toolbox open-vm-tools-dev And it all launched... Many thanks for the suggestions and help... This is what I love about Ubuntu... it has a great helpful community... ! Note: Also found this which may help others too: HERE ADDITIONAL ERROR: Could not open /dev/vmmon: Is a directory. Please make sure that the kernel module `vmmon' is loaded. Failed to initialize monitor device. Monitor settings all greyed out RESOLUTION: Re-installation of Nvidia Drivers

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  • How can I make an unmounted / unmountable NTFS disk not show up in the nautilus devices area?

    - by Dennis
    I have an idea that my /etc/fstab is a real mish-mash and I don't remember how it got that way, first of all it looks like this UUID=9EB80807B807DD21 /media/Storage ntfs-3g users 0 0 UUID=a60397fd-964a-45b1-ad35-53c8a4bee010 / ext4 defaults 0 1 UUID=1764825d-b8ba-4620-b3b0-e979b6f4f5c4 swap swap sw 0 0 UUID=255DA1E406E29DBC /media/sda2 ntfs-3g defaults 0 0 UUID=2CCCF161CCF1262C /mnt/sda1 ntfs-3g umask=000 0 0 /dev/fd0 /media/floppy0 vfat noauto 0 0 I started with an old XP install on disk /dev/sda that I don't use anymore but didn't want to delete, so I shrunk the XP partition, added a NTFS partition that would be common to both systems (Labeled it "Common" in XP), then installed Lucid on an extended ext4 partition. On this disk of course the ext4 system partition comes up as /, the go between partition auto-mounts on /media/sda1 but shows up in Nautilus as COMMOM, while the XP system disk does not show up in Nautilus, but I can get to it by navigating to /mnt/sda1. A second hard drive (/dev/sdb) that I stuck in was already formatted NTFS with a bunch of stuff and labeled "Storage". It auto-mounts to /media/Storage but another un-mounted disk also shows up in the Nautilus device area called Storage but it can't be mounted (Here and in the "Places" are the only times it appears) I would primarily like this non-existant (or already mounted depending on how you look at it) disk to not show up, but I wouldn't mind an explanation of why one labeled partition auto-mounts to a /media mount point but shows up by label, one does not show up as mounted at all but mounts to a /mnt mount point and is there for navigation, and one is mounted to a directory of the same name as the label. I would love to have some consistancy / direction on what is proper in this circumstance. No doubt I caused this with the fstab but I really don't remember what my rational was if I edited it manually

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  • Object pools for efficient resource management

    - by GameDevEnthusiast
    How can I avoid using default new() to create each object? My previous demo had very unpleasant framerate hiccups during dynamic memory allocations (usually, when arrays are resized), and creating lots of small objects which often contain one pointer to some DirectX resource seems like an awful lot of waste. I'm thinking about: Creating a master look-up table to refer to objects by handles (for safety & ease of serialization), much like EntityList in source engine Creating a templated object pool, which will store items contiguously (more cache-friendly, fast iteration, etc.) and the stored elements will be accessed (by external systems) via the global lookup table. The object pool will use the swap-with-last trick for fast removal (it will invoke the object's ~destructor first) and will update the corresponding indices in the global table accordingly (when growing/shrinking/moving elements). The elements will be copied via plain memcpy(). Is it a good idea? Will it be safe to store objects of non-POD types (e.g. pointers, vtable) in such containers? Related post: Dynamic Memory Allocation and Memory Management

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  • HTML5 video capture and streaming?

    - by Shyatic
    I'm working on kind of an educational site, where there are teachers and students around the world (potentially). Since it's a non-profit site, and I don't have the need for it to be done tomorrow (kind of a side project of something bigger), I wanted to know the best way to figure out how to do this. I'm not a programmer by trade, I've been on the systems side of things for years, but I understand most technology and the question here is more how to gauge what to do so I can get the right resources in place. That said... here's what I am looking at. I figure the future is HTML5, and that's probably where I'd rather spend my efforts given that it will be cross platform and without the need for plugins. It will work on mobile as well. Question is, how well does HTML5 handle input media, say desktop capture and camera, or on mobile perhaps, where I'd want to use the user's phone camera, etc. Second question is dynamic streaming... I've read about MPEG DASH, then there are technologies like Smooth Streaming (which I think given the way Silverlight is going is going to be gone or useless), then also Apple and Flash, but if I'm doing HTML5 it doesn't benefit me. Any ideas here would be really helpful, and the more detail the better! :) That's about it... there are free chat services out there like using the MSN Web Chat controls (how good they are, I don't know, but worldwide most people have a Hotmail/MSN account) so I can use that for chat. I don't know its limitations of course, but that's something if people know or have suggestions, then I'm all ears. Thanks for the help, I greatly appreciate it!

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  • Android: how do I switch between game scenes in a game? Any tutorials?

    - by Flavio
    I am trying to create a simple game using the Android SDK without using AndEngine (or any other game engine). I have plenty of experience designing games from the past, but I'm having lots of trouble trying to use the Android SDK to make my game. By far my biggest hurdle right now is switching between views. That is, for example, going from the menu to the first level, etc. I am using a traditional model I learned (I think it's called a scene stack or something?) in which you push the current scene onto a stack and the game's main loop runs the top item of the stack. This model seems non-trivial to implement in the Android SDK, mostly because Android seems to be picky about which thread instantiates which view. My issue is that I want the first level to show up when you press a button on the main menu, but when I instantiate the first level (the level class extends SurfaceView and implements SurfaceHolder.Callback) I get a runtime error complaining that the thread that runs the main menu can't instantiate this class. Something about calling Looper.prepare(). I figured at this point I was probably doing things wrong. I'm not sure how to specifically phrase my issue into a question, so maybe I should leave it as either 1) Does anybody know a good way (or the 'proper' way) to switch between scenes in an Android game? or 2) Are there any tutorials out there which show how to create a game that doesn't take place entirely in one scene? (I have googled for a while to no avail... maybe someone else knows of one?) Thanks!

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  • Dependancies not met while instaling digikam 2.9

    - by Jean-Mi
    I'm trying to install digikam 2.9 from ttp://ppa.launchpad.net/philip5/kubuntu-backports/ubuntu here is the message I got: Les paquets suivants ont des dépendances non-satisfaites : digikam: Depends: libkdecore5 (>= 4:4.7.0) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: libkdeui5 (>= 4:4.7) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: libkfile4 (>= 4:4.7) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: libkhtml5 (>= 4:4.7) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: libkio5 (>= 4:4.7.0) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: libkipi9 (>= 4:4.8.80) mais la version 4:4.8.4d-precise~ppa1 va être installée Depends: libknotifyconfig4 (>= 4:4.7) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: libkparts4 (>= 4:4.7) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: libnepomuk4 (>= 4:4.7) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: libphonon4 (>= 4:4.2.0) mais la version 4:4.7.0really4.6.0-0ubuntu1 va être installée Depends: libqt4-dbus (>= 4:4.5.3) mais la version 4:4.8.1-0ubuntu4.2 va être installée Depends: libqt4-qt3support (>= 4:4.5.3) mais la version 4:4.8.1-0ubuntu4.2 va être installée Depends: libqt4-sql (>= 4:4.5.3) mais la version 4:4.8.1-0ubuntu4.2 va être installée Depends: libqt4-xml (>= 4:4.5.3) mais la version 4:4.8.1-0ubuntu4.2 va être installée Depends: libqtcore4 (>= 4:4.8.0) mais la version 4:4.8.1-0ubuntu4.2 va être installée Depends: libqtgui4 (>= 4:4.8.0) mais la version 4:4.8.1-0ubuntu4.2 va être installée Depends: libsolid4 (>= 4:4.7) mais la version 4:4.8.5-0ubuntu0.1 va être installée Depends: digikam-data (= 4:2.9.0-precise~ppa1kde49) mais la version 4:2.9.0-precise~pp Can someone help ? JM

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  • Would You Swim Laps in Lake Baikal?

    - by rickramsey
    source This is the lake where Yuli Vasiliev's countrymen swim laps. Yuli is one of my favorite OTN writers not just because he really knows his stuff. Not just because his writing is clear and accurate. And not just because his English is better than the English of most native speakers. Yo, those are all good reasons. But it's the Lake Baikal thing. Yuli recently wrote two wicked good how-to's about Oracle VM Templates. You should read them. You might gain a gram of Yuli's respect. Two grams, if you can head butt icebergs while you swim. How to Use Oracle VM Templates How to prepare an Oracle VM environment to use Oracle VM Templates, how to obtain a template, and how to deploy the template to your Oracle VM environment. Also how to create a virtual machine based on that template and how you can clone the template and change the clone's configuration. How to Use Oracle VM VirtualBox Templates How to use Oracle VM VirtualBox Templates in Oracle VM VirtualBox. Similar to the article above, but it describes how to download, install, and configure the templates within Oracle VM VirtualBox, instead of on bare metal. Other OTN Technical Articles by Yuli Vasiliev Retrieving, Transforming, and Consolidating Web Data with Oracle Database Setting Up, Configuring, and Using a WebLogic Server Cluster Cube Development for Beginners How to XQuery Non-JDBC Sources from JDBC Advanced Dimensional Design with Oracle Warehouse Builder Using the JDBC Connectivity Layer in Oracle Warehouse Builder High Performance Oracle JDBC Programming Python Data Persistence with Oracle Querying JPA Entities with JPQL and Native SQL - Rick Website Newsletter Facebook Twitter

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  • Best practices for App Idea ownership and shares

    - by JOG
    I am developing apps on my sparetime. I am the sole developer, and two non-programmer friends of mine provide vision, content, algorithms and ideas. We always agree happily on all the features, todos and prioritizations. But naturally, coding it is the biggest part. When selling, we agree on splitting profit equally, that is 33% each. But version 1.0 naturally does not sell much. And I go on to try to make the app more viral. This includes tons of stuff where the others are of little help. Examples: Adding support for sharing, facebook connect, gameifying, letting users add content, home page, support, maintenance, server services to make it easier for to update content. The list is long. Suddenly I will be doing 100% of a lot of work but only "own" a third of the income. My friends may either "fade out" of the project after 1.0, or they continue to contribute, but with less value and I would rather exchange them for more programmers or graphic designers. The effort they made to version 1.0 is worth a lot to the app and I realize I would have never done it without them. But I am doing all the work in the end. It is hard to negotiate about splitting 90, 5, 5 instead of 33% each, because the idea is still theirs. How to solve this? What are the best practices to regard the ownership of the app? What kind of agreements could I make that make it beneficial and motivational for me to continue developing the app?

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  • Augmenting functionality of subclasses without code duplication in C++

    - by Rob W
    I have to add common functionality to some classes that share the same superclass, preferably without bloating the superclass. The simplified inheritance chain looks like this: Element -> HTMLElement -> HTMLAnchorElement Element -> SVGElement -> SVGAlement The default doSomething() method on Element is no-op by default, but there are some subclasses that need an actual implementation that requires some extra overridden methods and instance members. I cannot put a full implementation of doSomething() in Element because 1) it is only relevant for some of the subclasses, 2) its implementation has a performance impact and 3) it depends on a method that could be overridden by a class in the inheritance chain between the superclass and a subclass, e.g. SVGElement in my example. Especially because of the third point, I wanted to solve the problem using a template class, as follows (it is a kind of decorator for classes): struct Element { virtual void doSomething() {} }; // T should be an instance of Element template<class T> struct AugmentedElement : public T { // doSomething is expensive and uses T virtual void doSomething() override {} // Used by doSomething virtual bool shouldDoSomething() = 0; }; class SVGElement : public Element { /* ... */ }; class SVGAElement : public AugmentedElement<SVGElement> { // some non-trivial check bool shouldDoSomething() { /* ... */ return true; } }; // Similarly for HTMLAElement and others I looked around (in the existing (huge) codebase and on the internet), but didn't find any similar code snippets, let alone an evaluation of the effectiveness and pitfalls of this approach. Is my design the right way to go, or is there a better way to add common functionality to some subclasses of a given superclass?

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  • What .NET objects should I use to create a cookie based session in MVC?

    - by makerofthings7
    I'm writing a custom password reset application that uses a validation technique that doesn't fit cleanly with ASP.NET Membership Provider's challenge questions. Namely I need to invoke a workflow and collect information from the end user (backup phone number, email address) after the user logs in using a custom form. The only way I know to create a cookie-based session (without too much "innovation" on my part) is to use WIF. What other standard objects can I use with ASP.NET MVC to create an authenticated session that works with non-windows user stores? Ideally I can store "role" or claim information in the session object such as "admin", "departmentXadmin", "normalUser", or "restrictedUser" The workflow would look like this: User logs in with username and password If the username and pw are correct a (stateless) cookie based session is created The user gets redirected to a HTML form that allows them to enter their backup phone number (for SMS dual factor), or validate it if already set. The user can then change their password using the form provided The "forgot password" would look like this User requests OTP code to be sent to the phone User logs in using username and OTP If the OTP is valid and not expired then create a cookie based session and redirect to a form that allows password reset Show password reset form, and process results.

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  • backface culling error (in world space)

    - by acrilige
    I write simple software renderer. In my pipeline i have stage of backface culling. But looks like it has some error (see picture). I perform culling right after world transformation (is it correct?). (i can't insert picture in post coz i don't have enough points, so i just upload it (cube model): http://imageshack.us/photo/my-images/705/bcerror.png/) Vector3F view_dir(0.0f, 0.0f, 1.0f); std::vector<Triangle> to_remove; for (Triangle &t : m_triangles) { Vector4F e1 = t.v2 - t.v1; Vector4F e2 = t.v3 - t.v1; Vector3F normal( e1.y * e2.z - e1.z * e2.y, e1.z * e2.x - e1.x * e2.z, e1.x * e2.y - e1.y * e2.x ); normal.Normalize(); float dot = Dot(view_dir, normal); if (dot <= 0) to_remove.push_back(t); } for (Triangle& t : to_remove) m_triangles.erase(std::remove(m_triangles.begin(), m_triangles.end(), t), m_triangles.end()); Camera sits in origin and points in screen (RH). What is the reason? For better explanation i upload picture with cube rotation screenshots: http://imageshack.us/photo/my-images/842/bcmove.png/ UPDATED: The error occurs only when triangle has non-zero offset from origin UPDATED 2: If i process backface culling in clip space (after transforming all vertices with view and projection matrix), and just check z coordinate of triangle normal - it works perfect... Can i perform culing RIGHT BEFORE view/proj transforms? In this case looks like culling will not depends of projection and it's not right?.. UPDATED 3: I found answer and will post it in two hours - again coz of reputation lack.

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  • Webcam doesn't work in Ubuntu 12.10

    - by Kzhi
    I have Gembird cam68ut. On my Ubuntu 12.10 it shows black screen in cheese and guvcview. I tested it in win7, it works fine. Here what I found: It is a uvc compliant camera, I checked on the site: 18ec:3299 USB 2.0 PC Camera (model number QC3231) ArkMicro This webcam is report by lsusb: Bus 001 Device 004: ID 18ec:3299 Arkmicro Technologies Inc. Here is the output of dmesg | tail: uvcvideo: Found UVC 1.00 device USB2.0 PC CAMERA (18ec:3299) uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround. input: USB2.0 PC CAMERA as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.0/input/input17 usbcore: registered new interface driver uvcvideo USB Video Class driver (1.1.1) When I run cheese (or guvcview), here what I get in terminal: libv4l2: error turning on stream: No space left on device (cheese:11797): cheese-WARNING **: Internal data flow error. I tried it on different usb slots with the same results The Webcam's microphone works, I can record audio with it Guys, any thoughts on what can be done to make it work?

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  • Sharing business logic between server-side and client-side of web application?

    - by thoughtpunch
    Quick question concerning shared code/logic in back and front ends of a web application. I have a web application (Rails + heavy JS) that parses metadata from HTML pages fetched via a user supplied URL (think Pinterest or Instapaper). Currently this processing takes place exclusively on the client-side. The code that fetches the URL and parses the DOM is in a fairly large set of JS scripts in our Rails app. Occasionally want to do this processing on the server-side of the app. For example, what if a user supplied a URL but they have JS disabled or have a non-standard compliant browser, etc. Ideally I'd like to be able to process these URLS in Ruby on the back-end (in asynchronous background jobs perhaps) using the same logic that our JS parsers use WITHOUT porting the JS to Ruby. I've looked at systems that allow you to execute JS scripts in the backend like execjs as well as Ruby-to-Javascript compilers like OpalRB that would hopefully allow "write-once, execute many", but I'm not sure that either is the right decision. Whats the best way to avoid business logic duplication for apps that need to do both client-side and server-side processing of similar data?

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  • Consolidating multiple domain names

    - by Mike
    I have a client that has three separately hosted copies of their website, each on a separate domain name. The websites are all essentially the same, bar a few discrepancies caused by badly managed updates in the past. I will soon be launching a completely new website for them, at which point, all three domain names are to resolve to the same web server. One domain name will become the default domain name that they refer to in all their literature, and the other two will simply be used as catch-alls for old links, bookmarks, and so on. I would like to know what people consider the best route to achieve this. My plan so far is: Get the new site up and running on the new webserver. Change the relevant A record of the default domain name to point to the new webserver. a) Keep the existing hosting accounts in operation. Create a list of 301 redirects from old page names on the old site to new page names on the new site. or b) Configure CNAME records for the non-default domain names, each pointing to the new webserver. Create a list of 301 redirects on the new site that redirect from old page names to new page names. If my understanding is correct, 3a will help to maintain whatever search engine rankings the sites already have (I know it's not going to be perfect), while at the same time informing search engines that the old domain names are no longer in use. What's a good approach to take here?

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