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• Storyboard editor layout confusion

  - by drew

  I am having layout problems with the storyboard editor with a fairly simple screen. I have a UIViewController to which I have added a 320x440 UIScrollView at 0,0 followed by a 320x20 UIProgressBar at 0,440. It looks fine in Storyboard editor. I'm not entirely sure how the 20 pixel status bar at the top of the screen is accommodated given the CGRect frame coordinates that Storyboard calculates. On loading ( in -(void)viewDidLoad ), the UIScrollView frame seems to be set to 320x460 pixels at 0,0 but the UIProgressBar is still 320x20 at 0,440. When I add subviews to the UIScrollView, (UIImageViews in particular), they get stretched and get clipped on the screen because although the UIScrollView thinks it is 460 pixels high, it only has 440 pixels of screen to display in. Can anyone point me to a solution? Thanks

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• Weblogic server 10.0 - Managed Server shutting down

  - by Eqbal

  We have a weblogic server 10.0 instance which has a cluster with one managed server. Every Monday at 5am (or few seconds after), it shuts down on its own. The logs do not show any errors except the following message: JVM called WLS shutdown hook. The server will force shutdown now. JVM has a -Xnohup option and using JRockit. There is no cron job on the server. I am not sure how to debug this one. Admin Server keeps running with no issues and I am able to start the managed server back up with no problems. Any help is greatly appreciated. Thanks.

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• why can't I comment lines in visual mode

  - by Haiyuan Zhang

  I want to comment several lines in my .vimrc, the usual way I do it is :x,ys/^/"/ and x stands for the start line number and y stands for the line number of the last line. I read some post which said in visual mode this task can be done by the following step: 1 Select your lines with VISUAL BLOCK 2 press I to insert before all highlighted lines. 3 type your comment charact , in this case should be " 4 then ESC I fllowed the above steps and met met problems in step 2 . the thing is when I select the lines in Visual mode and press I , vim ( I use version7.2) go back to insert mode and the cursor back to the start of the first line. so if you continue to do the step 3 and step 4, you end up in just inserting " at the start the first line , far from what I want to achieve. so could you point out what's wrong with the recipe ? thanks in advance

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• Compiling a C program with a specific architecture

  - by Marplesoft

  I was recently fighting some problems trying to compile an open source library on my Mac that depended on another library and got some errors about incompatible library architectures. Can somebody explain the concept behind compiling a C program for a specific architecture? I have seen the -arch compiler flag before and have seen values passed to it such as ppc, i386 and x86_64 which I assume maps to the CPU "language", but my understanding stops there. If one program uses a particular architecture, do all libraries that it loads need to be on the same architecture as well? How can I tell what architecture a given program/process is running under?

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• SELECT SUM returns a row when there are no records

  - by Jose L Martinez-Avial

  Hi, I'm finding some problems with a query that returns the sum of a field from a table for all the records that meet certain conditions. I expected to receive a "No records found' when there were no records, but instead I'm receiving a null result. SQL> SELECT * FROM DUAL WHERE 1=2; no rows selected SQL> SELECT SUM(dummy) FROM DUAL WHERE 1=2; SUM(DUMMY) ---------- SQL> Is there any way to not receive any record in that case?

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• CodePlex Daily Summary for Saturday, January 29, 2011

  CodePlex Daily Summary for Saturday, January 29, 2011Popular ReleasesRawr: Rawr 4.0.17 Beta: Rawr is now web-based. The link to use Rawr4 is: http://elitistjerks.com/rawr.phpThis is the Cataclysm Beta Release. More details can be found at the following link http://rawr.codeplex.com/Thread/View.aspx?ThreadId=237262 and on the Version Notes page: http://rawr.codeplex.com/wikipage?title=VersionNotes As of the 4.0.16 release, you can now also begin using the new Downloadable WPF version of Rawr!This is a pre-alpha release of the WPF version, there are likely to be a lot of issues. If you...VivoSocial: VivoSocial 7.4.2: Version 7.4.2 of VivoSocial has been released. If you experienced any issues with the previous version, please update your modules to the 7.4.2 release and see if they persist. If you have any questions about this release, please post them in our Support forums. If you are experiencing a bug or would like to request a new feature, please submit it to our issue tracker. Web Controls * Updated Business Objects and added a new SQL Data Provider File. Groups * Fixed a security issue whe...PHP Manager for IIS: PHP Manager 1.1.1 for IIS 7: This is a minor release of PHP Manager for IIS 7. It contains all the functionality available in 56962 plus several bug fixes (see change list for more details). Also, this release includes Russian language support. SHA1 codes for the downloads are: PHPManagerForIIS-1.1.0-x86.msi - 6570B4A8AC8B5B776171C2BA0572C190F0900DE2 PHPManagerForIIS-1.1.0-x64.msi - 12EDE004EFEE57282EF11A8BAD1DC1ADFD66A654BloodSim: WControls.dll update: Priority Update It's just come to my attention that the latest version of WControls.dll was not included in the 1.4 release and as a result, BloodSim has been unuseable. Please download WControls.dll from here, and this will rectify the issue.VFPX: VFP2C32 2.0.0.8 Release Candidate: This release includes several bugfixes, new functions and finally a CHM help file for the complete library.DB>doc for Microsoft SQL Server: 1.0.0.0: Initial release Supported output HTML WikiPlex markup Raw XML Supported objects Tables Primary Keys Foreign Keys ViewsmojoPortal: 2.3.6.1: see release notes on mojoportal.com http://www.mojoportal.com/mojoportal-2361-released.aspx Note that we have separate deployment packages for .NET 3.5 and .NET 4.0 The deployment package downloads on this page are pre-compiled and ready for production deployment, they contain no C# source code. To download the source code see the Source Code Tab I recommend getting the latest source code using TortoiseHG, you can get the source code corresponding to this release here.Office Web.UI: Alpha preview: This is the first alpha release. Very exciting moment... This download is just the demo application : "Contoso backoffice Web App". No source included for the moment, just the app, for testing purposes and for feedbacks !! This package includes a set of official MS Office icons (143 png 16x16 and 132 png 32x32) to really make a great app ! Please rate and give feedback ThanksParallel Programming with Microsoft Visual C++: Drop 6 - Chapters 4 and 5: This is Drop 6. It includes: Drafts of the Preface, Introduction, Chapters 2-7, Appendix B & C and the glossary Sample code for chapters 2-7 and Appendix A & B. The new material we'd like feedback on is: Chapter 4 - Parallel Aggregation Chapter 5 - Futures The source code requires Visual Studio 2010 in order to run. There is a known bug in the A-Dash sample when the user attempts to cancel a parallel calculation. We are working to fix this.Catel - WPF and Silverlight MVVM library: 1.1: (+) Styles can now be changed dynamically, see Examples application for a how-to (+) ViewModelBase class now have a constructor that allows services injection (+) ViewModelBase services can now be configured by IoC (via Microsoft.Unity) (+) All ViewModelBase services now have a unit test implementation (+) Added IProcessService to run processes from a viewmodel with directly using the process class (which makes it easier to unit test view models) (*) If the HasErrors property of DataObjec...NodeXL: Network Overview, Discovery and Exploration for Excel: NodeXL Excel Template, version 1.0.1.160: The NodeXL Excel template displays a network graph using edge and vertex lists stored in an Excel 2007 or Excel 2010 workbook. What's NewThis release improves NodeXL's Twitter and Pajek features. See the Complete NodeXL Release History for details. Installation StepsFollow these steps to install and use the template: Download the Zip file. Unzip it into any folder. Use WinZip or a similar program, or just right-click the Zip file in Windows Explorer and select "Extract All." Close Ex...Kooboo CMS: Kooboo CMS 3.0 CTP: Files in this downloadkooboo_CMS.zip: The kooboo application files Content_DBProvider.zip: Additional content database implementation of MSSQL, RavenDB and SQLCE. Default is XML based database. To use them, copy the related dlls into web root bin folder and remove old content provider dlls. Content provider has the name like "Kooboo.CMS.Content.Persistence.SQLServer.dll" View_Engines.zip: Supports of Razor, webform and NVelocity view engine. Copy the dlls into web root bin folder to enable...UOB & ME: UOB ME 2.6: UOB ME 2.6????: ???? V1.0: ???? V1.0 ??Password Generator: 2.2: Parallel password generation Password strength calculation ( Same method used by Microsoft here : https://www.microsoft.com/protect/fraud/passwords/checker.aspx ) Minor code refactoringVisual Studio 2010 Architecture Tooling Guidance: Spanish - Architecture Guidance: Francisco Fagas http://geeks.ms/blogs/ffagas, Microsoft Most Valuable Professional (MVP), localized the Visual Studio 2010 Quick Reference Guidance for the Spanish communities, based on http://vsarchitectureguide.codeplex.com/releases/view/47828. Release Notes The guidance is available in a xps-only (default) or complete package. The complete package contains the files in xps, pdf and Office 2007 formats. 2011-01-24 Publish version 1.0 of the Spanish localized bits.ASP.NET MVC Project Awesome, jQuery Ajax helpers (controls): 1.6.2: A rich set of helpers (controls) that you can use to build highly responsive and interactive Ajax-enabled Web applications. These helpers include Autocomplete, AjaxDropdown, Lookup, Confirm Dialog, Popup Form, Popup and Pager the html generation has been optimized, the html page size is much smaller nowFacebook Graph Toolkit: Facebook Graph Toolkit 0.6: new Facebook Graph objects: Application, Page, Post, Comment Improved Intellisense documentation new Graph Api connections: albums, photos, posts, feed, home, friends JSON Toolkit upgraded to version 0.9 (beta release) with bug fixes and new features bug fixed: error when handling empty JSON arrays bug fixed: error when handling JSON array with square or large brackets in the message bug fixed: error when handling JSON obejcts with double quotation in the message bug fixed: erro...Microsoft All-In-One Code Framework: Visual Studio 2008 Code Samples 2011-01-23: Code samples for Visual Studio 2008MVVM Light Toolkit: MVVM Light Toolkit V3 SP1 (3): Instructions for installation: http://www.galasoft.ch/mvvm/installing/manually/ Includes the hotfix templates for Windows Phone 7 development. This is only relevant if you didn't already install the hotfix described at http://blog.galasoft.ch/archive/2010/07/22/mvvm-light-hotfix-for-windows-phone-7-developer-tools-beta.aspx.New ProjectsAsp.Net MvcRoute Debugger Visualizer: Asp.Net MvcRoute Debugger Visualizer is an extension for Visual Studio 2010.It displays the matched route data and datatokens of all defined routes in your mvc applicationAutoLaunch for Windows Embedded Compact (CE): AutoLaunch component for Windows Embedded CE 6.0 and Windows Embedded Compact 7BicubicResizeSilverlight: A client-side Silverlight library for performing a bicubic resize. Cloud Monitoring Studio: Cloud Monitoring Studio provides real-time performance monitoring mechanism for Azure deployed applications/Azure roles with the help of easy-to-understand graphs. Users can configure required performance counters for individual Azure roles through easy-to-use & intuitive GUI.CoreCon for Windows Embedded Compact (CE): CoreCon component for Windows Embedded CE 6.0 and Windows Embedded Compact 7, to simplify the tasks needed to include CoreCon files to the OS image.DokanDiscUtils Bridge: This a a bridge for the Dokan library and the DiscUtils library that allows Any partition/image that discutils can open to be mounted using dokanEverything About My Share: Everything About My ShareExtraordinary Ideas: This project contains some Extra oradinary solutions for difficult software problems.. Article's are in Turkish Language tahircakmak.blogspot.comIE9 Helper: The IE9 Helper is an ASP.NET Helper to makes adding IE9 features simple.ITSolutions: .NET Sandbox SolutionsKitty - Async Server: Kitty is an Async Server with C# and Java versions. It builds on Parallelism to deliver a Internet Scale Server StarterKit.mediainfocollector: Retrieves info from mediafilesMini - Async WebSocket Server: Mini is an Async WebSocket Server with versions in C# and Java. It builds on Parallelism and Kitty to deliver an Internet Scale WebSocket Server StarterKit. MVC N-tier EMR Sample Application: This sample uses EMR to showcase a MVC N-Tier application. It uses WCF to separate the presentation from the DB/Backend.MyPhotoGallery: MyPhotoGallery is a photo gallery developed in ASP.Net MVC.NuGet: NuGet is a free, open source developer focused package management system for the .NET platform intent on simplifying the process of incorporating third party libraries into a .NET application during development.OneCode CodeBox: OneCode CodeBoxonecode toolkit: toolsOrchard SSL: Orchard Secured Sockets Layer (SSL) adds new features to force the usage of SSL in sections like authentication pages or the dashboard.OrchardCMS - Lokalizacija: OrchardCMS - Lokalizacija je projekat lokalizacije Orchard CMS-a na srpski, hrvatski, srpskohrvatski, hrvatskosrpski i sve ostale jezike sa podrucija ex-YU. Pokušacemo da iskorisitmo slicnosti u jezicima kako bi jedni drugima pomogli i olakšali lokalizaciju Orchard-a. Pyxis Install Maker: This utility creates single file installs for Pyxis 2 applications.SaleCard: TestSharePoint Social Networking: A Collection of solutions aimed at adding social network to your SharePoint 2010 site. The collection will include web parts, ribbon extensions and other type of solutions that will add or enhance the social networking capabilities of SharePoint. The solution is written in c#.SmartScreenTerminator: Pissed off by the stupid "smart screen" asking you to "remember to protect your password" every time you click someone else's blog link in your Windows Live homepage? Use this three line appication to allow your IE to automatically navigate to the destination page.StreetScene: StreetScene is a sample project showing how to use Microsoft technologies such as ASP.NET, Azure and Silverlight to build rich applications.svmnetx: testtest_project: test projectTweet-Links: Tweet-Links is designed for ultra-fast sending a twitter selected text and files and images.WCMF - Windows Content Management Framework: WCMF is a framework that allows one to build CMS appllications that target the Windows platform (whereas a typical CMS system is usually web based). Used technologies are MEF, WCF, WPF (including Silverlight) and Caliburn.Micro.WebNoteAOP: A sample project for aspect oriented programming with PostSharp. The main purpose is a short introduction. All aspects are made in a very simple way. They should be useful for simple applications. Please keep in mind, that complex problems often require a complex solution, too.

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• sqlite compiler errors

  - by mspoerr

  Hello, when including "sqlite.c" into my project, I get lots of compiler errors: error C2027: use of undefined type "_ht" d:\...\sqlite3.c line 19556 ... fatal error C1003: Errors in the program are too numerous to allow recovery. The compiler must terminate. When inlcuding "sqlite.c" into an empty test project, I have no problems. I already compared project settings and there are no big differences. How can I troubleshoot this problem? Is there anyone who had the same issue? Thanks, mspoerr

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• armv6 / armv7 errors when compiling for iPhone

  - by Chris

  I am having problems trying to compile my App to my iPhone. I upgraded to the new SDK and have 4.0 on my phone... which I did not do that. I am compiling for 3.1.2 - It works fine in the simulator but when I "build" for the Device, it gives me this line of errors: Link /Users/me/Apps/myapp/build/app.build/Debug-iphoneos/app.build/objects-normal/armv7/appname In /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.3.sdk/user/lib/libz.dylib, missing required architecture armv7 in file then the actual failure occurs on: Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1 Any help would be greatly appreciated

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• How can I specifiy JUnit test dependencies?

  - by Egon Willighagen

  Our toolkit has over 15000 JUnit tests, and many tests are known to fail if some other test fails. For example, if the method X.foo() uses functionality from Y.foo() and YTest.testFoo() fails, then XTest.testFoo() will fail too. Obviously, XTest.testFoo() can also fail because of problems specific to X.foo(). While this is fine and I still want both tests run, it would be nice if one could annotate a test dependency with XTest.testFoo() pointing to YTest.testFoo(). This way, one could immediately see what functionality used by X.foo() is also failing, and what not. Is there such annotation available in JUnit or elsewhere? Something like: public YTests { @Test @DependsOn(method=org.example.tests.YTest#testFoo) public void testFoo() { // Assert.something(); } }

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• Practical non-Turing-complete languages?

  - by Kyle Cronin

  Nearly all programming languages used are Turing Complete, and while this affords the language to represent any computable algorithm, it also comes with its own set of problems. Seeing as all the algorithms I write are intended to halt, I would like to be able to represent them in a language that guarantees they will halt. Regular expressions used for matching strings and finite state machines are used when lexing, but I'm wondering if there's a more general, broadly language that's not Turing complete? edit: I should clarify, by 'general purpose' I don't necessarily want to be able to write all halting algorithms in the language (I don't think that such a language would exist) but I suspect that there are common threads in halting proofs that can be generalized to produce a language in which all algorithms are guaranteed to halt. There's also another way to tackle this problem - eliminate the need for theoretically infinite memory. Once you limit the amount of memory the machine is allowed, the number of states the machine is in is finite and countable, and therefore you can determine if the algorithm will halt (by not allowing the machine to move into a state it's been in before).

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• Space-based architecture?

  - by rcampbell

  One chapter in Pragmatic Programmer recommends looking at a blackboard/space-based architecture + a rules engine as a more flexible alternative to a traditional workflow system. The project I'm working on currently uses a workflow engine, but I'd like to evaluate alternatives. I really feel like a SBA would be a better solution to our business problems, but I'm worried about a total lack of community support/user base/venders/options. JavaSpaces is dead, and the JINI spin-off Apache River seems to be on life support. SemiSpace looks perfect, but it's a one-man show. The only viable solution seems to be GigaSpaces. I'd like to hear your thoughts on space based architecture and any experiences you've had with real world implementations.

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• Magic behind R.java file

  - by LambergaR

  Hi! Recently I have been having quite some problems with R.java file. Now I have decided to do a backup and delete the file to see what happens. Nothing happened, so I created an empty R.java file and hopped for the best. Now Eclipse seems to figure out that the file was tempered with and even issues a warning: R.java was modified manually! Reverting to generated version! And that's all there is. I tried building it manually but got no results. So, I have two questions: 1. what should I do to force Eclipse to generate the file 2. what is happening here? How is the file created, where is the code that is generating the file? I would appreciate any help. As usual the problem occurred just a few days before the deadline :)

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• Clone a div that contains "customized" jQueryUI datePicker

  - by Enrique

  I have a div that contains 3 fields You can see the image here http://imgur.com/A3tbd.jpg I'm cloning this div with this plugin http://sroucheray.org/blog/demos/jquery-dynamic-form/ My problems are: It doesn't clone correctly datePicker. I'm using validate form plugin, but I guess this plugin is not prepared to validate cloned elements Is there any easy code, other plugin or some functions I should use for doing this sequence? Verify user has filled the 3 fields of the actual div If so, clone the div and create a new set of 3 fields. Also, clone datePicker correctly If user clicks the delete button, erase last div (last 3 fields) When form submitted, post all fields correctly Thanks,

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• What does this web.xml error mean?

  - by jacekn

  <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd"> Referenced file contains errors (http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd). For more information, right click on the message in the Problems View and select "Show Details..." The errors below were detected when validating the file "web-app_2_5.xsd" via the file "web.xml". In most cases these errors can be detected by validating "web-app_2_5.xsd" directly. However it is possible that errors will only occur when web-app_2_5.xsd is validated in the context of web.xml. In details, I see a bunch of these: s4s-elt-character: Non-whitespace characters are not allowed in schema elements other than xs:appinfo and xs:documentation. Saw 'var _U="undefined";'

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• Invalid binary. A pre-release beta version of the SDK was used to build the application.

  - by erik

  Yesterday I submitted an app to the iphone dev center, no problems at all. Today I did some changes to another existing app and was greeted by the following message when I uploaded my binary: The binary you uploaded was invalid. A pre-release beta version of the SDK was used to build the application. I googled the message and didn't find anything at all. I also tried but failed to update another app, same message there. I have not changed anything in between (that I know) and I have certainly not installed or downgraded my SDK. Building for iPhone 3.0..

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• Java - Problem in JTree

  - by Yatendra Goel

  There are 2 JTree: JTree1 and JTree2. Note that the nodes (country, city, colors, blue ...) all will be implemented as JCheckboxes so that user can select particular colors for each city or for the whole country by selecting their corresponding checkboxes. Problems: Q1. I want that each country or city can have its own colors selected. Means if a user wants city1.1 to have colors blue and violet and city2.1 to have colors red, then he first have to select the city1.1 checkbox and then select blue and violet, and after that when he selects city2.1, then the checkboxes blue and violet are deselected automatically so that user can select the colors for city2.1. But when the user selects the city1.1 again, then the JTree2should show the selected colors (bule and violet) for city1.1. So for this purpose, Is the JTree (with its nodes as checkboxes) correct option to implement or I should use some other JComponent? If JTree is a correct option, then how can I remember the colors of each city?

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• Problem wit MDAC when trying to compile in VS2008 using x64 bit target platform

  - by grobartn

  I am trying to compile an 32 bit application. I am aware of problems with it but that is why its being compiled on 64 bit version. I am hanging at this problem. Application uses lots of sql stuff. In sqltypes.h file: (provided by MDAC) #ifdef _WIN64 typedef INT64 SQLLEN; typedef UINT64 SQLULEN; typedef UINT64 SQLSETPOSIROW; #else For some reason when its compiled on 32 bit platform it works great But when I try building it on 64 it goes berserk. Error 61 error C2146: syntax error : missing ';' before identifier 'SQLLEN' ..\external\microsoft sdk\include\sqltypes.h 50 It does not recognize INT64, UINT64. Is there something I need to enable so it will work under 64 build process? Missing some #include or #define? Any help would be great Thanks

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• Managing web.config for teams in VS2010 & TFS

  - by Jarrett

  With VS2010's mandate that web.config be included in the project, how do we allow everyone to keep their own custom config file without getting into source control problems? Previously, we would simply leave web.config out of our project, allowing everyone to keep their own local version of web.config on their machine. We moved to VS2010, and it is now forcing me to add web.config to my project in order to run debug mode. Because our project is linked to TFS, it automatically adds web.config to source control and tries to maintain it that way. Is there a way to run in debug mode without including web.config in your project? Or is there a better way to manage config files?

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• How do I debug random Timeout::Error: execution expired

  - by ChrisH

  We are using Rails 2.3.5 and have been experiencing seemingly random Timeout::Error: execution expired errors. The errors reported by Hoptoad are not consistently in any particular controller and show up everywhere from user sessions to account settings to some of our core functionality controllers. The vast majority of requests do not Timeout but there are enough to cause concern. Is this normal? If so, what are some things to look at to decrease the occurance? If not, has anyone run into this and what are some common problems that can trigger an error like this.

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• Using Cepstrum for PDA

  - by CziX

  Hey, I am currently deleveloping a algorithm to decide wheather or not a frame is voiced or unvoiced. I am trying to use the Cepstrum to discriminate between these two situations. I use MATLAB for my implementation. I have some problems, saying something generally about the frame, but my currently implementation looks like (I'm award of the MATLAB has the function rceps, but this haven't worked for either): ceps = abs(ifft(log10(abs(fft(frame.*window')).^2+eps))); Can anybody give me a small demo, that will convert the frame to the power cepstrum, so a single lollipop at the pitch frequency. For instance use this code to generate the frequency. fs = 8000; timelength = 25e-3; freq = 500; k = 0:1/fs:timelength-(1/fs); s = 0.8*sin(2*pi*freq*k); Thanks.

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• Editable QTreeView with expandable cells

  - by serge

  Hi everyone, I tried to write an editable table based on QTreeView with wordwraped content in cells which in turn should expand in height (that whole text was visible) like usual cells in tables like in MSWord, but have met insuperable obstacles: first - i can't set fixed cell size. second - i can't make text display in cells wordwraped. For this i used void QTreeWidget::setItemWidget ( QTreeWidgetItem * item, int column, QWidget * widget ), but it works only for readonly solutions. And i haven't come up with any other idea. Can such behavior of QTreeView be realized? And how to solve those problems of mine? Thanks in advance Serge

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• Ending php sessions for debugging purposes

  - by Bill Zimmerman

  Hi, This might be very easy to do, but I haven't been able to figure it out. Basically, I have a loosely couple web-app written in python and php. The python code uses PHP sessions (generated from the PHP app when the user logs in) to check if the user is logged in/has permission to access the given python resource. My question is this: What is the easiest way to force all active sessions to timeout. I would like to do this for debugging purposes, to test out the python code. I tried changing the session.max_lifetime PHP variable, but that still doesn't guarantee that the session has ended and is removed. I tried just deleting the file, but this seems to cause problems (when i refresh the php page, errors show up in my apache logs and it won't reload quickly) Any ideas?

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• Use same project to create multiple applications on same device

  - by Mark.Prof

  I am deploying a reader application with it's document packaged in the asset folder. Any branding is done by dynamically generating xml and resources as appropriate. The application name itself is also generated. Since it is the tag's "package" property that needs to be unique, I nevertheless have a problem installing more than one instance of this app. I would like to dynamically edit the manifest package attribute's value to reflect the document and brand that I am building. But this causes build problems, specifically the location of R.java is no longer available to the component package under which the code resides. Originally, the component package is the same as the application manifest package. But precisely this manifest package name is the part that needs to be variable. How should I best proceed?

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• bjam wih visual studio 2010

  - by ra170

  ok, so I ran into problems with Boost under visual studio 2010, so I decided to rebuild it with bjam: such as: bjam --toolset=msvc-10.0 --build-type=complete After running bjam (successfully?) it created a new directory under boost_1_42_0 called: bin.v2 Inside bin.v2 is directory called: libs. Two issues: 1. there's lot less libs under that new directory (about 13), the old directory libs has 88. Is it supposed to be like that or did something fail? 2. the structure is somewhat different too. What do I do with this exactly? Meaning, do I copy it over to the original libs, delete the old libs, try rebulding it with different flags?

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• Making swap faster, easier to use and exception-safe

  - by FredOverflow

  I could not sleep last night and started thinking about std::swap. Here is the familiar C++98 version: template <typename T> void swap(T& a, T& b) { T c(a); a = b; b = c; } If a user-defined class Foo uses external ressources, this is inefficient. The common idiom is to provide a method void Foo::swap(Foo& other) and a specialization of std::swap<Foo>. Note that this does not work with class templates since you cannot partially specialize a function template, and overloading names in the std namespace is illegal. The solution is to write a template function in one's own namespace and rely on argument dependent lookup to find it. This depends critically on the client to follow the "using std::swap idiom" instead of calling std::swap directly. Very brittle. In C++0x, if Foo has a user-defined move constructor and a move assignment operator, providing a custom swap method and a std::swap<Foo> specialization has little to no performance benefit, because the C++0x version of std::swap uses efficient moves instead of copies: #include <utility> template <typename T> void swap(T& a, T& b) { T c(std::move(a)); a = std::move(b); b = std::move(c); } Not having to fiddle with swap anymore already takes a lot of burden away from the programmer. Current compilers do not generate move constructors and move assignment operators automatically yet, but as far as I know, this will change. The only problem left then is exception-safety, because in general, move operations are allowed to throw, and this opens up a whole can of worms. The question "What exactly is the state of a moved-from object?" complicates things further. Then I was thinking, what exactly are the semantics of std::swap in C++0x if everything goes fine? What is the state of the objects before and after the swap? Typically, swapping via move operations does not touch external resources, only the "flat" object representations themselves. So why not simply write a swap template that does exactly that: swap the object representations? #include <cstring> template <typename T> void swap(T& a, T& b) { unsigned char c[sizeof(T)]; memcpy( c, &a, sizeof(T)); memcpy(&a, &b, sizeof(T)); memcpy(&b, c, sizeof(T)); } This is as efficient as it gets: it simply blasts through raw memory. It does not require any intervention from the user: no special swap methods or move operations have to be defined. This means that it even works in C++98 (which does not have rvalue references, mind you). But even more importantly, we can now forget about the exception-safety issues, because memcpy never throws. I can see two potential problems with this approach: First, not all objects are meant to be swapped. If a class designer hides the copy constructor or the copy assignment operator, trying to swap objects of the class should fail at compile-time. We can simply introduce some dead code that checks whether copying and assignment are legal on the type: template <typename T> void swap(T& a, T& b) { if (false) // dead code, never executed { T c(a); // copy-constructible? a = b; // assignable? } unsigned char c[sizeof(T)]; std::memcpy( c, &a, sizeof(T)); std::memcpy(&a, &b, sizeof(T)); std::memcpy(&b, c, sizeof(T)); } Any decent compiler can trivially get rid of the dead code. (There are probably better ways to check the "swap conformance", but that is not the point. What matters is that it's possible). Second, some types might perform "unusual" actions in the copy constructor and copy assignment operator. For example, they might notify observers of their change. I deem this a minor issue, because such kinds of objects probably should not have provided copy operations in the first place. Please let me know what you think of this approach to swapping. Would it work in practice? Would you use it? Can you identify library types where this would break? Do you see additional problems? Discuss!

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