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  • Naming interfaces for persistent values

    - by orip
    I have 2 distinct types of persistent values that I'm having trouble naming well. They're defined with the following Java-esque structure, borrowing Guava's Optional for the example and using generic names to avoid anchoring: interface Foo<T> { T get(); void set(T value); } interface Bar<T> { Optional<T> get(); void set(T value); } With Foo, if the value hasn't been set explicitly then there's some default value available or pre-set. With Bar, if the value hasn't been set explicitly then there's a distinct "no value" state. I'm trying to optimize the names for their call sites. For example, someone using Foo may not care whether there's a default value involved, only that they're guaranteed to always have a value. How would you go about naming these interfaces?

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  • Ubuntu won't appear on laptop startup

    - by Jade
    I've recently installed Ubuntu along with Windows Vista. So normally when the laptop is starting up it shows two options whether I want to log on Windows or Ubuntu. One day I shut down the laptop and I open it the next and it just logs onto Windows automatically without giving me the option to choose. I go to check if Ubuntu was un-installed or something, but it was still there and everything, but I can't open it. I don't know if there's any additional info I should add because I'm not very good with computers, and I don't want to re-install it because I have my stuff on it so I'd lose it, and I'm having trouble backing it up. Any suggestions?

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  • XNA Monogame GameState Management not deserilaizing

    - by Pectus Excavatum
    I am having some trouble serializing/deserializing in a little game I am doing to teach myself monogame. Basically, I am using the gamestatemnanagement resources common to monogame (screen manager etc). Then I am serializing my screen manager component and all associated screens in the OnDeactivated method: protected override void OnDeactivated(Object sender, EventArgs args) { foreach (GameplayScreen screen in mScreenManager.GetScreens()) { DataManager.SaveData(screen.Level.LevelData); } mScreenManager.SerializeState(); } The Save data bit is to do with something else. Then I then override OnActivated to de serialize protected override void OnActivated(Object sender, EventArgs args) { //System.Diagnostics.Debug.WriteLine("here activating"); mScreenManager.DeserializeState(); } However, when this runs it just loads a blank screen - it goes into the game initialize and the game draw method, but doesnt go down into the screens initialize or draw methods. I have no idea why this might be - any help would be greatly appreciated. I am not the only one who has encountered this - I found this post also - https://monogame.codeplex.com/discussions/391117

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  • Crafting an effective php/web programmer job post template [closed]

    - by Tchalvak
    I am looking to create a job post to get a satisfactory assistant programmer / templater. Specifically, a php & web programmer. I am, however, afraid of forgetting important things. So, are there resources you can suggest for templates for things to ask and things to tell in a job post for a programmer? Surprisingly, I wasn't able to find similar questions on this site, so there may be duplicate questions out there that I could use but just didn't find. Right now I know that my -requirements- are so generic that they're going to get me in trouble with a spam of applications. e.g. the candidate must know php, must be able to seperate php from html. So I'm looking for criteria that are must-haves, must-mentions, or a general template to try to avoid a "lemon". I also started a gist to work on a job post, comments/edits would be excellent: https://gist.github.com/2906808

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  • Ubuntu 12.10 install freezes at configuring hardware

    - by Max Keener
    I'm installing Ubuntu 12.10 (64 bit) from a bootable USB stick. At first I had trouble with a black screen after selecting 'install ubuntu'. I added nomodeset and xforcevesa to the options to fix that problem. Now when installing, it hangs at 'Configuring Hardware', specifically at ubuntu ubiquity: update-initramfs: Generating /boot/initrd.img-3.5.0-17-generic Specs: Asus UX32a DB51 Intel Core i5 3317U 1.7 GHz 4GB DDR3 RAM intel hd 4000 graphics 500 GB harddrive with 25 GB sandisk ssd I'm trying to install Ubuntu by itself right now on the SSD. I made custom partitions (100 mb EFI boot partition, 4GB swap space, 20GB ext4 mounted on '/') I've tried re-downloading the ubuntu iso and creating a new boot image on my flash drive and it results in the same problem. Thanks in advance for the help!

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  • Wordpress Multisite Network installation and dev questions

    - by Daitya
    Please go easy on me. I'm a clutzy dinosaur. I currently have a large, unwieldy website hand-coded in html/css with php includes. It currently has a single WP installation in a subdirectory. The plan is to reorganize, and I want to use WP as the CMS and incorporate 3 WP blogs for 3 subdomains. Ideally, would like to create a WP multisite network to allow for further expansion and to save admin trouble. I just want to confirm that if I install WP in the root directory and create 3 blogs (in subdomains), does this mean my website's home page is the mother blog's index.php? Essentially, I will have created 4 blogs - mother at root and 3 children in subdomains? How to set this up on my Mac (OSX 10.5.8) running MAMP for development? And then how to migrate to server without breaking?

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  • Not enough space left in the hard drive. How to proceed?

    - by jimbobjgr
    Where do I begin... I can hardly do anything on Ubuntu 12.04. I am very close to removing and returning to Windows. First I could not load it because the graphics appeared to be running low but somehow that stopped happening and I could log on. Now I can not download anything or I get this message Cannot write: No space left on device. I tried trouble shooting this issue but every time I try and fix the problem I am blocked by this message E: Write error - write (28: No space left on device) E: Can't mmap an empty file E: Failed to truncate file - ftruncate (9: Bad file descriptor) E: The package lists or status file could not be parsed or opened. $ OLD=$(ls -tr /boot/vmlinuz-* | head -n -2 | cut -d- -f2- | awk '{print "linux-image-" $0}') Ubuntu is also running incredibly slow and I cant get anything done! Please help this is driving me mad!

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  • How do I draw a texture to a MSTerrain object?

    - by Brad
    I'm using Farseer to make a game in XNA and I can't seem to figure this out. I've decided to use MSTerrain for making my game's terrain because I wanted destructible terrain and MSTerrain seemed like the best bet. Unfortunately, I'm stumped on how to actually show the terrain. When I generate the terrain it's visible in debug view, but MSTerrain does not have a Draw method, so I'm wondering how it is supposed to be drawn to the screen? Is it worth pursuing? I'm starting to think that MSTerrain is more trouble than it's worth, is there another better way to do this with bodies?

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  • Hidden Launch Bar wouldn't slide-out when moused over, now it won't hide away.

    - by Dave Keller
    When the launch bar is hidden, I have trouble getting it to slide out when I move the mouse pointer to the left side. After adjusting the settings under Settings--Appearance--Behavior, the bar no longer hides when a browser is open. Is there a fix for this. This all happened when I was looking for a way to change the icon sizes in the launch bar. Documentation from Linux.com told me to do it under Settings--Appearance, but there was no way to do it. Any help is appreciated! Thanks.

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  • Adding a short delay between bullets

    - by Sun
    I'm having some trouble simulating bullets in my 2D shooter. I want similar mechanics to Megaman, where the user can hold down the shoot button and a continues stream of bullets are fired but with a slight delay. Currently, when the user fires a bullet in my game a get an almost laser like effect. Below is a screen shot of some bullets being fired while running and jumping. In my update method I have the following: if(gc.getInput().isKeyDown(Input.KEY_SPACE) ){ bullets.add(new Bullet(player.getPos().getX() + 30,player.getPos().getY() + 17)); } Then I simply iterate through the array list increasing its x value on each update. Moreover, pressing the shoot button (Space bar) creates multiple bullets instead of just creating one even though I am adding only one new bullet to my array list. What would be the best way to solve this problem?

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  • Should I use a unit testing framework to validate XML documents?

    - by christofr
    From http://www.w3.org/XML/Schema: [XML Schemas] provide a means for defining the structure, content and semantics of XML documents. I'm using an XML Schema (XSD) to validate several large XML documents. While I'm finding plenty of support within XSD for checking the structure of my documents, there are no procedural if/else features that allow me to say, for instance, If Country is USA, then Zipcode cannot be empty. I'm comfortable using unit testing frameworks, and could quite happily use a framework to test content integrity. Am I asking for trouble doing it this way, rather than an alternative approach? Has anybody tried this with good / bad results? -- Edit: I didn't include this information to keep it technology agnostic, but I would be using C# / Linq / xUnit for deserialization / testing.

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  • How can you remove Unity?

    - by Brad
    In previous versions of Netbook Remix I was able to disable the netbook-launcher and just have a blank desktop. I liked the speed of the Netbook version but not the interface, this worked well for me. However, now with 10.10 and Unity I'm having trouble doing a similar thing. I tried removing netbook-launcher from the startup and tried uninstalling unity. The best result I got was a black desktop with a panel and a non configurable blank white background. Is Unity soo integrated into this version that I will have to just go with the default ubuntu installation?? In the past the default version has been slower then the Netbook version without the interface. Thanks.

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  • How do I run Microsoft Explorer 8 plus on Ubuntu?

    - by user169487
    First off, you should know I'm a Ubuntu newbie who has become passionate since my strangely low-priced Dell computer showed up with Ubuntu loaded on it and it could do almost everything I need from a computer. But now I've got a problem. I know, it's like asking how to use a cassette player on your computer, but in South Korea EVERY website is made to work with exclusively on MS Explorer PLUS Active X, which Microsoft finally killed with 9. Hence, I have to use 8, as there are some Korean sites I need to access for searching, banking, etc. So I see that the way to go is to load PlayOnLinux, but then I it tells me to delete these. Do I really have to do that? Should I just hit "Install Anyway"? Or would that be just asking for trouble?

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  • From Java to Javascript? [duplicate]

    - by theGreenCabbage
    This question already has an answer here: Are there any OO-principles that are practically applicable for Javascript? 2 answers I am primarily a Java programmer. Because of its OO principles and the general paradigm of Java programming, like wrapping things in static variables, and having things return specific types, heavily aids me in "visualizing" a program. Instead of thinking of a big program, I can, instead, focus on smaller organized parts of my eventual program, and add functionality and build up from there. Thus, I have trouble programming in other languages. Or at least, I have not been able to program in the same ability as I do in Java compared to other languages. I know Javascript has OO principles, so I'd like to learn this language in a OO-based like I would program with Java. Is this possible?

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  • Ubuntu boot repair Dell M1530

    - by Jon Laicov
    I'm new to Ubuntu and recently tried installing it on a Dell M1530. I had Win7 x64 installed on the HDD, and would like to have dual boot option. I had trouble installing the first time and after ran the boot-repair. After running through the process, it was unable to complete. I do have a URL http://paste.ubuntu.com/7942911. Can someone help me fix this issue or direct me where to post or email? Thanks in advance.

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  • Does an incomplete update affect my programs?

    - by Junior
    I saw a pop up which said 'updates are available' so I clicked it. I completely forgot that the installation was incomplete, I logged off. NOw when I came back, it told me to do a partial update. I read the internet for information, partial update wasn't the safest thing for me. I tried to log in to skype, it said another skype may exist. That wasn't true, Skype wasn't opened. I'm not sure if it's because of the incomplete update, but I'm quite off, in trouble. Please reply. Thank you Regards Junior

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  • Dell Vostro 1510 can't connect to wireless--how can I fix this?

    - by Miss Spider
    I'm having some trouble with my Dell Vostro 1510. I installed wubi on it two days ago and I've only been able to use the Internet with an ethernet cable. The network seems to definitely recognize that the wireless--even other peoples' wireless--is there, but it can't manage to get on. I'll post the lpsci here, so that you can see the Broadcom card I'm working with. I have downloaded the kernel 2.6.39-0-generic, which doesn't appear to have done a lick of work. 06:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

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  • Identifying connected lines drawn free-hand by a user

    - by rawrgoesthelion
    I have a series of 'images' described by a mixture of connected lines and curves. Users will draw on the screen, free hand, and my goal is to break their drawing down into a series of lines and curves that can be matched with the 'images' in my set. For the sake of simplicity, let's assume this is occurring on a touch screen. These lines will be connected. Each time the user's finger moves, the dx and dy is recorded. The drawing is considered complete and analyzed when the user's finger leaves the screen. I'm having trouble figuring out a good way to break the user's drawing down into lines. Is there any well known approach to this problem, a C++ library that solves it, or any good articles/technical papers on how to achieve this?

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  • How can I compute the Big-O notation for a given piece of code?

    - by TheNew Rob Mullins
    So I just took a data structure midterm today and I was asked to determine the run time, in Big O notation, of the following nested loop: for (int i = 0; i < n-1; i++) { for(int j = 0; j < i; j++2) { //1 Statement } } I'm having trouble understanding the formula behind determining the run time. I thought that since the inner loop has 1 statement, and using the series equation of: (n * (n - 1)) / 2, I figured it to be: 1n * (n-1) / 2. Thus equaling (n^2 - 1) / 2. And so I generalized the runtime to be O(n^2 / 2). I'm not sure this is right though haha, was I supposed to divide my answer again by 2 since j is being upped in intervals of 2? Or is my answer completely off?

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  • Pygame - CollideRect - But How Do They Collide?

    - by Chakotay
    I'm having some trouble figuring out how I can handle collisions that are specifically colliding on the top or bottom a rect. How can specify those collisions? Here's a little code snippet to give you an idea of my approach. As it is now it doesn't matter where it collides. # the ball has hit one of the paddles. send it back in another direction. if paddleRect.colliderect(ballRect) or paddle2Rect.colliderect(ballRect): ballHitPaddle.play() if directionOfBall == 'upleft': directionOfBall = 'upright' elif directionOfBall == 'upright': directionOfBall = 'upleft' elif directionOfBall == 'downleft': directionOfBall = 'downright' elif directionOfBall == 'downright': directionOfBall = 'downleft' Thanks in advance. **EDIT** Paddle rect: top ____ | | | | | | Sides | | ---- bottom I need to know if the ball has hit either the top or the bottom.

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  • 3d Collision Handling

    - by TobSpr
    I have trouble while detecting collisions on my 3D-Game. I have set-up Rays, to detect collisions (Screenshot) and my main-rountine already analyzes them. But now there's the question what to do with that. One possibility would be, to move the player back to the last position, but that's dirty, and does not work if the player can walk in multiple directions (e.g. if the player runs along a wall). My question is, what to do with the collision data / or in which direction, by which amount move the player? I'm sure there is an algorithm for that (as for almost all is).

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  • Dual Screens not working nVidia

    - by user91396
    So I'm very much an Ubuntu noob, in fact I just install Ubuntu to my P.C. and I started it up with both my screens plugged into my nVidia's dvi and vga ports and logged in, change the skin to classic gnome, because that's how it was when I last used Ubuntu (8.1), and both screens were working separately. The trouble is that I got a notification saying there was nVidia drivers to be installed, so I install them and restart my P.C., as it told me to, and when I get back on only one of my screens is working and when I go into Displays (All Settings, Displays) it doesn't register my other screen at all, and it calls my working screen "Laptop". I've tried looking through several pages of Google but I see no answer. I did try to find the nvidia-settings to see if that had the answers but sadly I couldn't locate it. Thanks in advance for any help, but please remember, I am very new to Ubuntu.

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  • Client-Side V.S. Server-Side Searching?

    - by user70278
    I am currently helping to design a web site and application in HTML. We would like the user to be able to search the site/app for desired content via a search bar. We would also like to include an advanced search ability to allow for different search options and more concentrated searches. We are having trouble deciding whether to program the search function on the Client-Side (with JavaScript) or on the Server-Side (with PHP). What are the pros and cons of both and what would you recommend?

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  • ERROR while getting interface

    - by user284391
    I have installed the latest version of aircrack-ng, but when i run this code, sudo airmon-ng start wlan0 I get this. sudo airmon-ng start wlan0 Found 4 processes that could cause trouble. If airodump-ng, aireplay-ng or airtun-ng stops working after a short period of time, you may want to kill (some of) them! -e PID Name 463 avahi-daemon 475 avahi-daemon 683 NetworkManager 756 wpa_supplicant Interface Chipset Driver wlan0 Broadcom wl - [phy0]mon0: ERROR while getting interface flags: No such device (monitor mode enabled on mon0) Is there anyone who could help me get this problem solved please.

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  • GUI won't load, but the desktop background loads. Can't access the terminal

    - by Mickeysofine
    Having trouble with the Ubuntu GUI. I can log in just fine (see this)... everything looks normal there. But as soon as I put in my password, I get this. I tried a few different troubleshooting keyboard commands (ctrl+alt+t, crtl+alt+delete), and only the latter worked. I can interact with that window just fine, except I am unable to resize or move it. The first time I logged in, I got a dialog box that said, "Ubuntu has experienced an internal error. Send error report?" Doesn't say anything now. Yes I tried restarting it. Thanks a bunch, Michael EDIT: Trying to start a guest session leads to the same problem.

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