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  • Ruby (and Rails) nested module syntax

    - by brad
    I'm wondering what the difference is between the following two modules # First Example module Parent module Child end end and # Second Example module Parent::Child end Using the 2nd method, it appears as though the Parent module must be previously defined, otherwise I get an 'uninitialized constant' error Given this, what is the preferred way of defining modules such as this and then adding nested children with regards to syntax and file structure (ie. folders etc). Reference to a Rails way would be greatly appreciated. Are these two examples for all intents and purposes equivalent?

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  • how to adjust JFrame and JInternal frames with any screen size?

    - by Zakaria Marrah
    I am working on a swing application that starts with JFrame, but all the other frames are included as JInternalFrames, and i am facing some serious screen size problems when i instaled it in different computers, i used the following methode to set the JFrame in full screen Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); setBounds(0, 0, screenSize.width, screenSize.height); JFrame.setExtendedState(JFrame.MAXIMIZED_BOTH); but thre is no no difference, i want also to adjust the JInternalFrames with the screen size too. if you have any suggestions, solution please help :D

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  • c++ std::ostringstream vs std::string::append

    - by NickSoft
    In all examples that use some kind of buffering I see they use stream instead of string. How is std::ostringstream and << operator different than using string.append. Which one is faster and which one uses less resourses (memory). One difference I know is that you can output different types into output stream (like integer) rather than the limited types that string::append accepts. Here is an example: std::ostringstream os; os << "Content-Type: " << contentType << ";charset=" << charset << "\r\n"; std::string header = os.str(); vs std::string header("Content-Type: "); header.append(contentType); header.append(";charset="); header.append(charset); header.append("\r\n"); Obviously using stream is shorter, but I think append returns reference to the string so it can be written like this: std::string header("Content-Type: "); header.append(contentType) .append(";charset=") .append(charset) .append("\r\n"); And with output stream you can do: std::string content; ... os << "Content-Length: " << content.length() << "\r\n"; But what about memory usage and speed? Especially when used in a big loop. Update: To be more clear the question is: Which one should I use and why? Is there situations when one is preferred or the other? For performance and memory ... well I think benchmark is the only way since every implementation could be different. Update 2: Well I don't get clear idea what should I use from the answers which means that any of them will do the job, plus vector. Cubbi did nice benchmark with the addition of Dietmar Kühl that the biggest difference is construction of those objects. If you are looking for an answer you should check that too. I'll wait a bit more for other answers (look previous update) and if I don't get one I think I'll accept Tolga's answer because his suggestion to use vector is already done before which means vector should be less resource hungry.

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  • Best way to display a background with a pattern in an iPhone/iPad app

    - by Dr Dork
    Here's an example of the type of background image I'm talking about... Clearly, there's a pattern in it. My question is, if this were an iPad app and the background image was twice the size, would there be any significant benefits to taking advantage of this pattern by tiling the image? Or would it really make no difference in terms of performance and just be easier to load the entire image into a UIImageView? Thanks in advance for all your wisdom!

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  • How to subtract dates in YYYYMMDD format?

    - by NinjaBomb
    I have 2 integer fields that represent dates in the YYYYMMDD format. What is the best way to subtract 2 of these fields to get the correct # of days between them? For instance, if I take the difference between 20100511 and 20100428 I would like the result to be 13 and not 83. I know I need to convert the integer fields into date formats but everything I have tried either throws an exception or doesn't work correctly. What am I missing? Answers in vb.net please

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  • What is the benefit to add W3C logo in site?

    - by jitendra
    http://www.w3.org/QA/Tools/Icons If my code is valid then Should i add logo to all my personal and client sites.? Should i add logo to client sites and tell to client these are good to have? If code is valid but semantically correct even can we use logo? What is benefit and purpose to add these logos for XHTML, CSS accessibility. And what is the difference between Gold and Blue logo Why W3C provide these logos?

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  • Eclipse's Visual Studio Ctrl+Tab and Ctrl+Shift+Tab Equivalent

    - by jasonh
    In Visual Studio, I always use Ctrl+Tab and Ctrl+Shift+Tab to navigate between documents. I see that Eclipse has Ctrl+F6 to navigate between editors, but this isn't nearly the same behavior. The difference being, pressing it once and then again will get you moving back and forth between two files, whereas in VS, it will cause you to navigate forward based on the tab order in the editor. Any ideas on how I can replicate VS's behavior?

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  • What does plus sign does here in string?

    - by Thanga
    I would like to know, what is the difference between two statements, these may be simple String ss="myname"; char[] charArray = ss.toCharArray(); for ( char character : charArray ) { System.out.println( +character );//Statements are here what does plus refers here: System.out.println( character ); //Statements are here: } I got the output for the code no errors but little doubt on how it works? What happens here? If you would down vote let me know the reason please , Thanks in advance

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  • What's behind the 'system' function in perl?

    - by JohnJohnGa
    i can thought that it will open a shell, execute the parameter (shell command) and return the result in a scalar. But, execute 'system' function in a perl script is faster than a shell command. It will call this command in C? If yes, what's the difference between rmdir foo and system('rmdir foo'); Thanks,

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  • C++ performance, for versus while

    - by aaa
    hello. In general (or from your experience), is there difference in performance between for and while loops? What if they are doubly/triply nested? Is vectorization (SSE) affected by loop variant in g++ or Intel compilers? Thank you

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