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  • Extend Google AppEngine User in JRuby?

    - by Ryan Montgomery
    I'm working with JRuby and DataMapper running on Google AppEngine. I want to add a property to the AppEngine::User like :active_calendar which is a reference to a Calendar kind. I was able to do something in Python this way using a back reference. Are these possible in JRuby? Is this possible? Do I need to subclass the User? Can I even do that? If so - how? Thanks!

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  • What are the possible causes of a not-booting motherboard with drdebug 00 code?

    - by Dutow
    I have pursached a new Asrock Z68 Extreme4 motherboard with an i7 2600K and 2x4GB ADATA DDR3. My problem is that it doesn't boot or beep, and the onboard drdebug led constantly displays "00" - which is according to the board's manual, "not used". The power cables are probably conntecting, because if I disconnect the 4+4 or 20+4 cable, nothing is displayed on the leds. Has anybody seen this error? What are the possible causes?

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  • How can I make a read-only ObservableCollection property?

    - by thrag
    I'd like to expose a property on a view model that contains a list of objects (from database). I need this collection to be read-only. That is, I want to prevent Add/Remove, etc. But allow the foreach and indexers to work. My intent is to declare a private field holding the editable collection and reference it with a read-only Public Property. As follows public ObservableCollection<foo> CollectionOfFoo { get { return _CollectionOfFoo; } } However, that syntax just prevents changing the reference to the collection. It doesn't prevent add/remove, etc. What is the right way to accomplish this?

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  • UML binary association aggregatee has access to aggregator

    - by user314172
    Firstly, I'd like to thank those who answered my previous question ages ago. Currently I'm engaging more in the design phase UMLs, as this is my first medium scale deployment I'm entrusted with. This is extremely simple, but it bugs me so. If (Component) owns (Manager of Component), and (Manager of Component) has a reference to (Component) through which it manages it; how do you fully describe the relationship? I know it is aggregative, but how do you describe (Manager of Component) possessing a reference/pointer to the (Component) that physically owns the (Manager of Component) ? Example: Lidar owns a LidarManager

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  • Copy method optimization in compilers

    - by Dženan
    Hi All! I have the following code: void Stack::operator =(Stack &rhs) { //do the actual copying } Stack::Stack(Stack &rhs) //copy-constructor { top=NULL; //initialize this as an empty stack (which it is) *this=rhs; //invoke assignment operator } Stack& Stack::CopyStack() { return *this; //this statement will invoke copy contructor } It is being used like this: unsigned Stack::count() { unsigned c=0; Stack copy=CopyStack(); while (!copy.empty()) { copy.pop(); c++; } return c; } Removing reference symbol from declaration of CopyStack (returning a copy instead of reference) makes no difference in visual studio 2008 (with respect to number of times copying is invoked). I guess it gets optimized away - normally it should first make a copy for the return value, then call assignment operator once more to assign it to variable sc. What is your experience with this sort of optimization in different compilers? Regards, Dženan

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  • C++ private pointer "leaking"?

    - by jbu
    I'm going to create a class to hold a long list of parameters that will be passed to a function. Let's use this shorter example: class ParamList{ public: ParamList(string& a_string); string& getString(); //returns my_string private: string& my_string; } My question is this: my_string is private, yet I'm returning the reference to it. Isn't that called something like private pointer leaking in C++? Is this not good programming practice? I want callers of getString to be able to get the reference and also modify it. Please let me know. Thanks, jbu edit1: callers will use getString() and modify the string that was returned.

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  • latex and bibtex problem

    - by Hellnar
    Hello, I am trying to compile an academical paper with chicago style citations. For this I am using a file named chicago.sty, Document compiles however I do not see any reference or citation.Instead I somehow get error when reading the paper.blg file: This is BibTeX, Version 0.99cThe top-level auxiliary file: paper.aux I couldn't open style file chicago.bst ---line 62 of file paper.aux : \bibstyle{chicago} What is a blg file, and how can I generate it from the .sty file so that my citations and references display properly. I do a such include: .... \usepackage{chicago} \addto\captionsenglish{\def\refname{Reference-List}} .... .... %at the bottom of the source file: \bibliographystyle{chicago} \singlespacing \bibliography{paper}%name of the bib file Regards.

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  • Starting/Stopping services as a program start and end

    - by Starx
    I have some applications like VMWare, SQL Server, which have a lot services started even without me using the software. I have changed the startup of this services to manual and have created a .bat file to start the services up and then I launch the program. But, its not a efficient solution. I would like to start the services once the application starts and stop once the application closes as well. Does anyone know of any solution?

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  • Recover a deleted webpage

    - by rc
    Suppose, a blog or a nice article was hosted on a website and it got deleted or worse the website was brought down. How do you view that web page? I tried searching for the cached version in Google. But, looks like the content was deleted long ago and is not listed in the search results directly. There are annotations to the link from many other sites, but still the actual content is not fully available. Now, can anybody help me see this page... I am actually looking for http://effectize.com/become-coolest-programmer :) And, moreover, in addition to bookmarking a favorite link, is it possible to cache the content of the link as well for later reference in case it gets deleted? EDIT: Looks like a URL can be cached for future reference. Try: http://backupurl.com/

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  • Importing libraries in eclipse programmatically

    - by Krt_Malta
    Hi, Is there a way I could put a library (Jar file) into an Eclipse project programatically? Up to now I've managed to do an external reference to it programatically using IPath path = new Path("C:\\Hello\\jtwitter.jar"); libraries.add(JavaCore.newLibraryEntry(path, null, null)); //add libs to project class path try { javaProject.setRawClasspath(libraries.toArray(new IClasspathEntry[libraries.size()]), null); } catch (JavaModelException e1) { e1.printStackTrace(); } } however I'd like to copy the jtwitter file to the project folder programatically so I could reference it as jtwitter.jar only. Can this be done please? Thanks a lot and regards, Krt_Malta

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  • Open Office: How to disable image link updates

    - by Max Kielland
    I'm writing a user manual to a card game and there is a looot of linked images. Open Office is working so slow because every time I flip to a page with linked images it starts to update them. Is it possible to tell Open Office to NOT update the links until I tell it to do so? I would like it to display the same snapshot it showed the last time I initiated link update. I'm using Open Office v3.3.0 // Thank you.

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  • How can unit testing make parameter validation redundant?

    - by Johann Gerell
    We have a convention to validate all parameters of constructors and public functions/methods. For mandatory parameters of reference type, we mainly check for non-null and that's the chief validation in constructors, where we set up mandatory dependencies of the type. The number one reason why we do this is to catch that error early and not get a null reference exception a few hours down the line without knowing where or when the faulty parameter was introduced. As we start transitioning to more and more TDD, some team members feel the validation is redundant. Uncle Bob, who is a vocal advocate of TDD, strongly advices against doing parameter validation. His main argument seems to be "I have a suite of unit tests that makes sure everything works". But I can for the life of it just not see in what way unit tests can prevent our developers from calling these methods with bad parameters in production code. Please, unit testers out there, if you could explain this to me in a rational way with concrete examples, I'd be more than happy to seize this parameter validation!

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  • Javascript : where are high level data structures?

    - by user355056
    Hi! I'm writing a client program for a game in Javascript but I'm new in Javascript world. Core Javascript lack of high level data structures. I've found code snippets on internet but I'm looking for a reference library (like commons-collection or google-collection in java world). I found this post: http://stackoverflow.com/questions/2523436/javascript-implementation-of-a-set-data-structure which refers to jshashtable and closure. Are they reference implementations? Do you know something else? Thanks

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  • How to convert a 1 page PDF to a 2 page per sheet PDF?

    - by mokasin
    I would like to print a PDF so that on the front of the first page are the first two pages, on the back the 3rd and 4th and so on. ----------------- ----------------- | | | | | | | | | | | | | 1 | 2 | | 3 | 4 | . . . | | | | | | |_______|_______| |_______|_______| page 1 - front page 1 - front Because my printer using Linux fails to support manual duplex printing I'd thought, maybe I could edit the pdf in a according way. But how?

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  • java-maven2: How to include the a jar as depedency in pom so that I will be able to access test clas

    - by flavour-of-bru
    Hi, I have a set of functional jars(more than 3) that tests my source code. These jars just contains test classes and assisting asserter classes. I am creating a new performance jar that would import all the functional tests from these jars so that all can be run simultaneously. But when I include them as test dependencies in pom of current jar, what all I get to see is the classes in src/main/java. How can I include these functional jars as dependent jars so that I can also reference classes in src/test/java. In other words, how do I reference the test classes in other jars. In what way should I include the dependency as. Thanks for your support.

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  • that, self or me — which one to prefer in JavaScript?

    - by Török Gábor
    While coding JavaScript sometimes you store the reference of object this in a local variable for different purposes (to set proper scope, to help code obfuscators, etc.). There are coders who prefer aliasing this to that to make it obvious its intention. Other guys use self since it's pointing to the object itself. I even saw source codes where me held the reference and it still makes sense. Certainly there are other ones. Which one should I prefer? Is there a convention on which to use or is it only the matter of taste.

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  • Med-PC Programing Language

    - by mknuii
    There's this programing language called Med-PC that works with animal behavior. I'm trying to learn a bit about it, but i can't seem to find any kind of books or material about it. I've "google it" but all i seem to find are some references about it and a PDF explaining the installing of the program itself and sensors(for the experiments), not actual programing instructions. I'm looking for some kind of guidance, documents or books, some kind of reference where i can improve and learn about this language, or if it is based on some other language. I just need some reference about it. So i've resorted to StackOverFlow to see if anybody has worked, knows about it or can point me some links/books about it.

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  • C++11/14 and return( ... ) vs return

    - by user2485710
    In C++ you are allowed to write a return statement that looks like : return ( ... ); which is different from the more popular : return ... ; In particular the first version returns the address/reference of something that is local to the stack of the function which contains that return statement. Now why something would like to return a reference to something that, at that point, has no lifetime ? What are the use case for this idiom ? Considering the new buzzword and features from C++11 and C++14 there is a different usage for this ?

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  • Javascript looping only through defined properties of array. How?

    - by Beck
    For example if i'm keeping array of references via id like that: if(typeof channel_boards[misc.channel_id] == 'undefined') { channel_boards[misc.channel_id] = $('<div class="channel" channel_id="'+misc.channel_id+'"></div>').appendTo('#board'); } And then i'm looping through array to find required reference. I'm looping through undefined properties as well. Is it possible to loop only through defined properties? for(i=0;i<channel_boards.length;i++) { if(channel_boards[i] != undefined) { if(channel_boards[i].attr('channel_id') != visible) {channel_boards[i].addClass('hidden_board');} else {channel_boards[i].removeClass('hidden_board');} } } Maybe i should change the way i'm storing references? Via object for example, but how i'll be able to find proper reference via id number.

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  • Iterating Through a jQuery Object Array

    - by DeltaFox
    I know this has been asked and answered a couple times already, but I'm still confused about how to reference the current object when iterating over a jQuery array. For example, the following code gives me the error "TypeError: genH3Array[i].next is not a function". What is the right way to reference the current array object? var genH3Array = $('#Generation_II').parent(); genH3Array.push($('#Generation_III').parent());; genH3Array.push($('#Generation_IV').parent()) $.each(genH3Array, function(i, value) { if(genH3Array[i].next().attr("align") == "center") { genH3Array[i].next().next().next().insertBefore(heading.next()) } genH3Array[i].next().next().insertBefore(heading.next()) genH3Array[i].next().insertBefore(heading.next()) })

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  • how to debug a WCF service once it's out of dev env

    - by ffc
    hi, I have a WCF service that i've been able to communicate with fine while it's hosted locally. I have it deployed to a web server in IIS now, and I can get the wsdl file without error by navigating to http://site.com:8000/service/servicename.svc?wsdl in trying to test this, i've created a console app and was able to successfully add a service reference to this. But when I try to run a Get() method on the service reference, it just hangs with no response. How can I begin to debug this? Thanks!

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