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  • When virtual inheritance IS a good design?

    - by 7vies
    EDIT3: Please be sure to clearly understand what I am asking before answering (there are EDIT2 and lots of comments around). There are (or were) many answers which clearly show misunderstanding of the question (I know that's also my fault, sorry for that) Hi, I've looked over the questions on virtual inheritance (class B: public virtual A {...}) in C++, but did not find an answer to my question. I know that there are some issues with virtual inheritance, but what I'd like to know is in which cases virtual inheritance would be considered a good design. I saw people mentioning interfaces like IUnknown or ISerializable, and also that iostream design is based on virtual inheritance. Would those be good examples of a good use of virtual inheritance, is that just because there is no better alternative, or because virtual inheritance is the proper design in this case? Thanks. EDIT: To clarify, I'm asking about real-life examples, please don't give abstract ones. I know what virtual inheritance is and which inheritance pattern requires it, what I want to know is when it is the good way to do things and not just a consequence of complex inheritance. EDIT2: In other words, I want to know when the diamond hierarchy (which is the reason for virtual inheritance) is a good design

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  • Question about Virtual Inheritance hierarchy

    - by Summer_More_More_Tea
    Hi there: I encounter this problem when tackling with virtual inheritance. I remember that in a non-virtual inheritance hierarchy, object of sub-class hold an object of its direct super-class. What about virtual inheritance? In this situation, does object of sub-class hold an object of its super-class directly or just hold a pointer pointing to an object of its super-class? By the way, why the output of the following code is: sizeof(A): 8 sizeof(B): 20 sizeof(C): 20 sizeof(C): 36 Code: #include <iostream> using namespace std; class A{ char k[ 3 ]; public: virtual void a(){}; }; class B : public virtual A{ char j[ 3 ]; public: virtual void b(){}; }; class C : public virtual B{ char i[ 3 ]; public: virtual void c(){}; }; class D : public B, public C{ char h[ 3 ]; public: virtual void d(){}; }; int main( int argc, char *argv[] ){ cout << "sizeof(A): " << sizeof( A ) << endl; cout << "sizeof(B): " << sizeof( B ) << endl; cout << "sizeof(C): " << sizeof( C ) << endl; cout << "sizeof(D): " << sizeof( D ) << endl; return 0; } Thanks in advance. Kind regards.

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  • Old Hardware Specifications

    - by billswift
    Anyone know where I can get specs for old monitors and soho computers? I'm setting up some old computers as linux boxes and especially need monitor specs for setting X Window System parameters. Right now I need specs for a Packard Bell 1024S monitor.

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  • Hardware issue: UI freezes and hard drive light goes solid several times per hour

    - by alchemical
    I have a workstation that has been acting up for the last few weeks. It currently has Windows Server 2008 R2 installed on it, and 2 HDD mirrored. A few times per hour the screen will freeze up, applications will say "not responding", sometimes the screen will turn a lighter shaded color--at the same time the HDD light is on solid. This lasts anywhere from 10 to about 50 seconds. Could this be something with one of the drives or the mechanism keeping the mirror in place? Any other ideas?

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  • Looking for a software solution which acts like a hardware KVM

    - by Daisetsu
    I've seen programs like Synergy before which allow a keyboard and mouse to be used across multiple systems. Unfortunately Synergy treats both systems like they are the same thing (when you move the mouse too far to the right it jumps to the other computer, along with keyboard input). I only have 1 monitor so what I need to do here is have a quick way to view my other desktop that is easy to manage. Remote desktop is difficult because you have to take it out of fullscreen, then minimize it and then re-maximize it when you want to use it again. If there were a single button I could hit to switch to the other computer that would be optimal. Both computers are on the same lan.

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  • Laptop hardware recommendations for multi-platform development

    - by iama
    I am thinking of buying a laptop with the following configuration - Intel core 2 duo(or I3-330M)/ 4GB RAM/300+ GB 7200 RPM. I would like to be able to run two server VMs on this laptop with Win2K8 and Ubuntu (preferably 64 bit editions). Windows 7 will be the Host OS since that is the one that ships with the laptop. I am thinking of using VMWare player to run the two server OSs. Is this laptop good enough to run the two VMs side by side or do I need to go for a better configuration? Any suggestions? Thanks.

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  • Laptop hardware recommendations for multi-platform development

    - by iama
    I am thinking of buying a laptop with the following configuration - Intel core 2 duo(or I3-330M)/ 4GB RAM/300+ GB 7200 RPM. I would like to be able to run two server VMs on this laptop with Win2K8 and Ubuntu (preferably 64 bit editions). Windows 7 will be the Host OS since that is the one that ships with the laptop. I am thinking of using VMWare player to run the two server OSs. Is this laptop good enough to run the two VMs side by side or do I need to go for a better configuration? Any suggestions? Thanks.

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  • hardware leasing vs purchase

    - by musoNic80
    I'm wanting to get a new laptop and desktop. I'm self-employed and so both bits of kit are primarily for business use. I've been looking into leasing both computers as an alternative to purchasing outright. Does anyone have any experience of this? I'm UK based and have found a company called hardsoft which seem to offer a good service. I'm particularly attracted by the upgrade after 18 months option and the fact that the machines are under warranty for the lift of the lease. I'd be really grateful for general thoughts, especially if there are any UK users or hardsoft clients.

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  • Hardware profiling [closed]

    - by mgroves
    I'd like to upgrade my computer so that it's faster when editing/rendering video. I'm thinking of first getting a faster hard drive, but I'd like to be able to run some sort of profiling software to tell me what the bottleneck is when rendering video. Any suggestions about software that can do this for preferably Windows XP and preferably for free?

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  • Which hardware changes require operating system reinstallation?

    - by Mark
    I'm about to upgrade my computer but might keep some parts. Just wandering what I would have to keep to prevent me having to reinstall my OSs, at the moment I have a dual boot setup with ubuntu and windows 7. I'm pretty sure you can't just take your hard drive with the OS on it and put it into a different box and keep going (can you?) but I know you can change the graphics cards, secondary hard drives and ram with out a problem. So what is it that you can't change? The CPU? Motherboard? Thanks for any replies

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  • Hardware needs for video conversion server

    - by artaxerxe
    I would need to build a Linux server that will have as its main task to perform the video conversion. For video conversion, the most likely I will use FFMpeg tool. Question: Can anyone tell me if for improving this automated video conversion a video card will improve the process or not? The idea is that I will get movies at a very high quality that I will need to be converted in formats available for different devices (iPhone, iPad, etc.). That conversion will be performed through a CLI (command line interface). I will need that conversion to be done in the least time possible (ok, that's a kind of saying, not an absolutely specified short time).

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  • Lock System when certain hardware is removed

    - by er4z0r
    Hi all, I am working at a company where you are suppused to lock your screen whenever you leave your desk alone for a few minutes. Now I wondered if there is a nifty little tool that would lock my screen once a certain device is removed from the system. The ideal thing would of course be to have a short-range transmitter that causes the screen to be locked once it goes out of range. But for now I would also stick with removing a pen-drive from my laptop. I am pretty sure this is feasible. I just wan't to know if there are any preexistent projects.

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  • Hardware freeze during disk activity

    - by Thomi
    I built myself a linux-based NAS. It has several drives of various sizes and ages in an LVM configuration, with 800GB or so of data. The data is served using a simple samba server. This was working flawlessly, but after physically moving it, it has developed a strange fault: Whenever I do something on the server to cause disk activity, the entire machine freezes hard. This has the effect of killing any open network connections to the box, and generally making it useless. If I leave the machine for a few minutes it seems to come right again, but obviously this isn't really a solution. There are no error or warning messages in syslog, or the kernel logs. If I power the machine on, and leave it, it runs for several days without locking up. After that time I stopped testing. It doesn't freeze instantly - obviously it doesn't freeze while booting, and I can normally log in via SSH and start poking around in a few log files for a couple of minutes before it dies. My question is: What diagnostic tests can I run to determine the casuse?

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  • Windows 7 Reinstalling Hardware - How...?

    - by Ative
    I wanted to install a new driver for my Wireless Network Card but Windows 7 reported the driver was up to date. So I decided to uninstall the driver. That seemed to do more than I expected... My WiFi card no longer shows up on the computer. Nothing in Device Manager. I have no idea how to get it back. How can I get Windows to find the device? :/

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  • How to troubleshoot a hardware problem on linux?

    - by Jack
    Just to note I am not having a problem at the moment, but have had previously so it sparked my curiosity... When a computer locks up suddenly to so caps lock flashes incessantly and the only possibility to restart....how do you troubleshoot what is causing it? On Windows there would be some errors in the event log...on Linux it seems there is no opportunity for anything to be written to the log, making it hard to troubleshoot... In this case, how would you troubleshoot the problem through linux?

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  • Hardware issue, bsod with windows xp irq and strange messages with ubuntu

    - by JP Hellemons
    I have an old Acer T160 and it used to run Windows XP. But I keep getting random BSOD's. I keep seeing IRQ conflicts. I tried to run ubuntu, which runs and keeps running. But sometimes is not responding. Also there are these popups at ubuntu 12.04 that my network cable (which is onboard) is unplugged. But I have no cable in it! and have an usb dongle for wifi. which also seems unstable. have to (auto)reconnect sometimes. So my question is: is it my mobo, power supply or something else? FYI: I had an dvd-rw station which did not open properly, so unplugged the ata and power, als removed the second harddrive. now only have sata harddrive. also removed the extra video card (ati sapphire x1600 pro) so use only onboard video now and still have these issues. EDIT Update: will try with a new PSU (power supply unit of 400watt) the old (factory) one was 300watt. and will use a usb drive which has 12.04 ubuntu on it (made with unetbootin) to format everything and re-install ubuntu. (so also delete mbr partition) will update the day after tomorrow.

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  • hardware: delay and distinct 'click' before hard drive access

    - by matt lohkamp
    I have a windows 7 box stashed away in my closet, containing (among other things) 2 big HDDs linked together as a mirrored volume - basically a super lazy NAS / media server. I've noticed that when that drive is accessed (whether locally, on the machine itself, or remotely, from another computer, or my xbox, for example) there's a noticeable pause, and then from the computer itself, a 'click!' noise, after which the drive is accessed; e.g. open \\computername\shared\, wait 2 seconds, hear 'click!' and then see files appear in windows explorer. Any ideas? Otherwise the drive preforms normally - is it a windows thing? a HDD-about-to-die thing? Or a "yeah that always happens, you've just never noticed it before" thing?

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  • Choosing hardware for Flash Media Server

    - by minaev
    Having read the answers in this discussion, I still would like to come up with the same question: What should I buy to run Flash Media Interactive Server 3.5? I just have slightly different boundary conditions. We plan to serve video to ca. 1,000 users simultaneously. It will be live stream, so the server will receive the stream in HD (1280x720), cache it, reformat to various other resolutions and send it to users. OS of choice is Linux, but if you say it should MS-DOS, so it will be... What would be a decent server for this task?

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  • Suppliers for revision-controlled hardware, long-life motherboards?

    - by jacobsee
    Has anyone had good experience with suppliers of industrial computers, specifically 'long-life, revision-controlled' motherboards? I'm found a couple of likely candidates including ITOX, BCM, and DuroPC but haven't been able to find much in the way of independent review. I'm currently using off the shelf motherboards for an industrial data-acquisition system and am trying to eliminate the problem of rapid turnover/obsolescence of motherboards.

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