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  • Using typedefs from a template class in a template (non-member) function

    - by atomicpirate
    The following fails to compile (with gcc 4.2.1 on Linux, anyway): template< typename T > class Foo { public: typedef int FooType; }; void ordinary() { Foo< int >::FooType bar = 0; } template< typename T > void templated() { Foo< T >::FooType bar = T( 0 ); } int main( int argc, char **argv ) { return 0; } The problem is with this line: Foo< T >::FooType bar = 0; ...and the compiler makes this complaint: foo.c: In function ‘void templated()’: foo.c:22: error: expected `;' before ‘bar’ Normally one sees this when a type hasn't been declared, but as far as I can tell, Foo< T ::FooType should be perfectly valid inside templated().

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  • Are fopen/fread/fgets PID-safe in C ?

    - by Jane
    Various users are browsing through a website 100% programmed in C (CGI). Each webpage uses fopen/fgets/fread to read common data (like navigation bars) from files. Would each call to fopen/fgets/fread interefere with each other if various people are browsing the same page ? If so, how can this be solved in C ? (This is a Linux server, compiling is done with gcc and this is for a CGI website programmed in C.) Example: FILE *DATAFILE = fopen(PATH, "r"); if ( DATAFILE != NULL ) { while ( fgets( LINE, BUFFER, DATAFILE ) ) { /* do something */ } }

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  • Database solutions for storing/searching EXIF data

    - by webdestroya
    I have thousands of photos on my site (each with a numeric PhotoID) and I have EXIF data (photos can have different EXIF tags as well). I want to be able to store the data effectively and search it. Some photos have more EXIF data than others, some have the same, so on.. Basically, I want to be able to query say 'Select all photos that have a GPS location' or 'All photos with a specific camera' I can't use MySQL (tried it, it doesn't work). I thought about Cassandra, but I don't think it lets me query on fields. I looked at SimpleDB, but I would rather: not pay for the system, and I want to be able to run more advanced queries on the data. Also, I use PHP and Linux, so it would be awesome if it could interface nicely to PHP. Any ideas?

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  • How do I determine which C/C++ compiler to use?

    - by Adam Siddhi
    Greetings, I am trying to figure out which C/C++ compiler to use. I found this list of C/C++ compilers at Wikipedia: http://en.wikipedia.org/wiki/List_of_compilers#C.2FC.2B.2B_compilers I am fairly certain that I want to go with an open source compiler. I feel that if it is open source then it will be a more complete compiler since many programmer perspectives are used to make it better. Please tell me if you disagree. I should mention that I plan on learning C/C++ mainly to program 2D/3D game applications that will be compatible with Windows, Linux, MAC and iPhone operating systems. I am currently using Windows Vista x64 OS. Thanks, Adam

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  • Places to start for system programmer transitioning to web programming

    - by Sean Ochoa
    So here's where I'm coming from: My background is in C#, C++, VB Script, php, javascript, PowerShell, T-SQL, and VB 6. I have some experience with python, and a brief introduction to Ruby On Rails. At work, we're transitioning to a web based UI in the next year or so, but in asp.net & SilverLight. I would like to, if possible, learn more open source web technologies on the side. And, hopefully, in a year and a half or so, I would like to transition to a more open source web technology position. I found that I do really like python, but I'm open to pretty much anything. And yes, I do know Linux (ubuntu and gentoo), as well. And, here's my question: What technologies, frameworks, IDEs, or systems should I be highly proficient in to become a prime candidate for a position doing web application development using non-Microsoft technologies?

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  • What are all the disadvantages of using files as a means of communicating between two processes?

    - by Manny
    I have legacy code which I need to improve for performance reasons. My application comprises of two executables that need to exchange certain information. In the legacy code, one exe writes to a file ( the file name is passed as an argument to exe) and the second executable first checks if such a file exists; if does not exist checks again and when it finds it, then goes on to read the contents of the file. This way information in transferred between the two executables. The way the code is structured, the second executable is successful on the first try itself. Now I have to clean this code up and was wondering what are the disadvantages of using files as a means of communication rather than some inter-process communication like pipes.Is opening and reading a file more expensive than pipes? Are there any other disadvantages? And how significant do you think would be the performance degradation. The legacy code is run on both windows and linux.

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  • Is there a DRMAA Java library that works with Torque/PBS?

    - by dondondon
    Does anybody know a Java implementation of the DRMAA-API that is known to work with PBS/Torque cluster software? The background behind this: I would like to submit jobs to a newly set-up linux cluster from java using a DRMAA compliant API. The cluster is managed by PBS/Torque. Torque includes PBS DRMAA 1.0 library for Torque/PBS that contains a DRMA-C binding and provides in libdrmaa.so and .a binaries. I know that Sun grid engine includes a drmaa.jar providing a Java-DRMAA API. In fact I opted to use SGE but it was decided to try PBS first. The theory behind that decision was: 'DRMAA is a standard and therefore a Java API needs only a standards compliant drmaa-c binding.' However, I couldn't find such 'general DRMAA-C-java API' and now assume that this assumption is wrong and that the Java libraries are engine specific. Are we stuck here? Any comments appreciated.

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  • 8 byte Integer with Doctrine and PHP

    - by Rufinus
    Hi, the players: 64bit linux with php 5 (ZendFramework 1.10.2) PostgreSQL 7.3 Doctrine 1.2 Via a Flash/Flex client i get an 8byte integer value. the field in the database is an BIGINT (8 byte) PHP_INT_SIZE show that system supports 8byte integer. printing out the value in the code as it is and as intval() leads to this: Plain: 1269452776100 intval: 1269452776099 float rounding failure ? but what really driving me nuts is ERROR: invalid input syntax for integer: "1269452776099.000000"' when i try to use it in a query. like: Doctrine_Core::getTable('table')->findBy('external_id',$external_id); or Doctrine_Core::getTable('table')->findBy('external_id',intval($external_id)); How i am supposed to handle this ? or how can i give doctrine a floating point number which it should use on a bigint field ? Any help is much appreciated! TIA

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  • newbie: Rails on remote Apache server not displaying index.html.erb

    - by paracaudex
    I played around with Rails on my laptop (running Linux + Apache + MySQL) and had no trouble getting the Getting Started with Rails tutorial to work locally. Now I'm trying the same thing at work on a remote Mac OS X + Apache server, and things aren't quite so rosy. I typed rails blog -d mysql to create a directory called blog in /Library/WebServer/Documents/mydirectory. The trouble is, if I go to server.com/mydirectory/public, I get the public/index.html in my browser. But, I don't get this file if I go to server.com/mydirectory/. Instead, I get a 403 error. Also, when I: script/generate controller home index to create: app/views/home/index.html.erb I am unable to view this file, whether I go to server.com/mydirectory/home/index, or if I add a new line (map.root :controller => "home") to config/routes.rb and go to server.com/mydirectory. Am I missing something really obvious about Apache and Rails?

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  • Licensing your code in Mono

    - by Jerry
    I'm working with some code in Visual Studio. My parter-in-crime fellow developer has suggested that the code also be available to work under Mono. I'm impresed witht he work that is already done in Mono, but I'm very new to Mono, so I don't know what it can/cannot do. I've already written a class in C# using the .NET LicenseManager object. It writes to the windows registry, so I know I'll have to modify it so that it will use some compiler flags like #if Win32 or #if MONO. My question is two-fold: 1) Does Mono implement the same LicenseManager class structure? 2) If so, how do you guys lock down your code using LicenseManager in Linux? (i.e. Write to files, use a hardware dongle, compare to hardware serials, etc??)

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  • Placing Select Folders Under Version Control

    - by Jonah
    Hi, I have an SVN repository on my hosted server (linux), and I need to do local work on them on my windows machine (tortoise svn installed). To simplify my question, the dir structure looks like: root |--------sub1 |--------sub2 |--------sub3 ... |--------subN with additional subfolders under each subX. Say I only want certain sub-subfolders of "sub1" and "sub3" under version control. But on windows, when I commit a change with tortoisesvn, I still want to be able to right click the root folder, hit commit, and have any changes that exist anywhere under root in any selected folders to be committed. The problem is, I think using ignore would be very cumbersome, since there would be so many folders to ignore, at different levels of structure. So basically, I want to put the whole thing under version control, and then tell svn "ok, now ignore everything except X and Y". What is the easiest way to accomplish this? Thanks, Jonah

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  • cannot access new drive through nfs

    - by l.thee.a
    I am running nfs-kernel-server to access my files on my linux machine(ubuntu - /share). The disk I have been using is full. So I have added a new disk and mounted it to /share/data. My other pc mounts the /share folder to /mnt/nfs; but cannot see the contents of /mnt/nfs/data. I have tried adding /share/data to /etc/exports, but it did not help. What do I do?

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  • Active C++ project to contribute to

    - by Joseph Pond
    I am a self-taught c++/java programmer (I will be starting uni in August though!). I have worked on one project in which I was part of an active team. I really felt I learnt the most and gained a lot of experience while working with the team. Unfortunately it was a small closed source project which has recently taken a slumber. I'm looking for some active open source c++ projects which I could contribute to (preferably that are mainly developed on the linux platform). The other project I worked on was a video game, however, I would like to contribute to a project which has a functional purpose (other than to amuse). Any suggestions on possible projects?

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  • How do I delete a file from depot, but leave local copy in tact?

    - by Gary
    I'm trying to learn Perforce and want to delete a file from the depot(easy to do with p4 delete, p4 submit), but that deletes it from the client machine dir structure as well. I want to keep my local file in my directory intact. The only way I can see to do this would be to move it out of the hierarchy that is under Perforce control before deleting. I was able to get my file back by syncing an earlier version. Maybe I set up my client workspace wrong? Or am I misunderstanding a fundamental concept of source control? The client workspace is /home/user and I did it this way so I could add any file under my home directory without getting an error about the file not being under client's root. FYI - Linux client and server running P4D/LINUX26X86/2009.1/222893 (2009/11/12) Any advice appreciated. Thanks.

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  • Microsoft Robotics Studio in Ubuntu, with Wine ?

    - by Arkapravo
    I am using Ubuntu 9.10 and I am a bit of a robotics enthusiast. I have used KiKS (in MATLAB for simulating Khepera robots), MobotSim (in Windows, simulates a point like robot using a BASIC editor) and Player/Stage (with C/C++ on Ubuntu 9.04). My question, can MS Robotics Studio be installed in Ubuntu Linux using Wine (I am using 1.1.31) ? Has anyone done it ? Any other way to install MS Robotics Studio in Unix (Any flavour) ? Thanks for your reply !

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  • more details in Jboss console ?

    - by worldpython
    Dear all, I am new to JBOSS 4.2. when I start the server on CentOS 5.4(final). it give me simple log in its console. How I can show deployment errors, messages that wars print in Jboss log ? Thanks in advance 15:46:24,207 INFO [Server] Server Log Dir: /home/mebada/jad/jboss-4.2.3.GA/server /nops01/log 15:46:24,207 INFO [Server] Server Temp Dir: /home/mebada/jad/jboss-4.2.3.GA/server /nops01/tmp 15:46:24,208 INFO [Server] Root Deployment Filename: jboss-service.xml 15:46:25,849 INFO [ServerInfo] Java version: 1.6.0,Sun Microsystems Inc. 15:46:25,849 INFO [ServerInfo] Java VM: OpenJDK Client VM 1.6.0-b09,Sun Microsystems Inc. 15:46:25,849 INFO [ServerInfo] OS-System: Linux 2.6.18-164.el5,i386 15:46:26,674 INFO [Server] Core system initialized 15:46:41,567 INFO [WebService] Using RMI server codebase: http://127.0.0.1:8083/ 15:46:41,569 INFO [Log4jService$URLWatchTimerTask] Configuring from URL: resource:jboss-log4j.xml

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  • Synchronising scripts / db / files from dev system to web server

    - by Spoonface
    I work as a freelance web dev, and up until now have been ftping my scripts / databases / static files to my web server manually, but I'm finding that is too error prone. So I'm looking for an app to automate uploading new and updated scripts / files / databases / etc. I know a lot of independent devs use WinSCP or Unison, but I don't think those apps can synch databases. Does anyone have any other suggestions? It doesn't need to be anything overly feature rich as I'm not working within a team or across multiple operating systems or anything like that. I can purchase any reasonably priced license if necesary. My work is primarily for PHP / MySQL / Apache on a Windows system, and then uploaded to a Linux / Apache server. thanks for your time!

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  • Executing php with crontab

    - by Stefan Konno
    Hi everyone. I'm trying to run a php-script on a scheduled basis. So I'd thought crontab was a good idea. The server I'm using is on Linux which I'm not that familiar with. So the problem I'm having is, I don't know how make the script executable from php. I need to reference the script, or put it into a folder that can run php from the command line. So I don't know what path to give my crontab, for example: 5 * * * * var/www/some/path/script.php I found some vague information about this php executable being found in /usr/bin/php But I can't find any php file in there, maybe I don't have it installed? My php5 and apache installation is in: /etc/php5 So my question becomes, is there anyway to execute a php-script with crontab in any other folder, or do I just lack the php executable in usr/bin/php?

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  • Application Buddy Lists and Authentication - How does it all go together

    - by Krevin
    This is a broad but specific question. The idea is that we want to tie in a 'buddy' functionality to a communications app. Very broadly, I believe that the application clients would connect to a central database/auth service which would provide the buddy data and then allow client apps to connect directly to eachother, without passing communications through the server. Specifically, however, what solutions, software, products, servers, technologies, etc would be best to implement to handle such a task? Thanks for reading and responses are much appreciated. //edit: the com app may run on a linux distro, may be web based, or both

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  • Duplicate a Drupal installation from one server to another

    - by irot
    Hello. I have been developing a Drupal 6 site on my PC using XAMPP. I'm done now, and everything looks peachy. Problem is, I need to put all my content (including custom modules and themes) up onto a staging server which only has a fresh Drupal 6 install on it. I can't imagine having to set up all my custom content types and whatnot all over again on the staging server. So I ask, how does one go about doing what I need to do? Which is essentially duplicating my Drupal install from my PC, to the staging server. The staging server is running Linux, and I develop on a Windows PC, if that helps. Thanks in advance.

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  • ESS/AucTeX/Sweave integration

    - by aL3xa
    I'm using GNU/Linux distro (Arch, if that's relevant), Emacs v23.2.1, ESS v5.9 and AucTeX v11.86. I want to setup AucTeX to recognize .Rnw files, so I can run LaTeX on .Rnw files with C-c C-c and get .dvi file automatically. I reckon it's quite manageable by editing .emacs file, but I still haven't got a firm grasp on Elisp. Yet another problem is quite annoying - somehow, LaTeX is not recognizing \usepackage{Sweave} in preambule, so I actually need to copy Sweave.sty file (in my case located in /usr/share/R/texmf/Sweave.sty) to directory where .Rnw file is located (and I'm getting more frustrated with the fact that this is common bug on Windows platforms!) My question boils down to two problems: how to make LaTeX recognize \usepackage{Sweave} (without copying Sweave.sty to "home" folder each time) how to setup AucTeX to compile .Rnw files to .dvi

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  • building mono from svn - android target

    - by Jeremy Bell
    There were patches made to mono on trunk svn to support android. My understanding is that essentially instead of Koush's system which builds mono using the android NDK build system directly, these patches add support for the android NDK using the regular mono configure.sh process. I'd like to play around with this patch, but not being an expert in the mono build system, I have no idea how to tell it to target the android NDK, or even where to look. I've been able to build mono from SVN using the default target (linux) on Ubuntu, but no documentation on how to target android was given with the patches. Since anyone not submitting or reviewing a patch is generally ignored on the mono mailing list, I figured I'd post the question here.

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  • No network packets sent immediately after quick physical disconnect and reconnect.

    - by Hans
    I am using Boost's ASIO libraries to establish a UDP connection to a remote server. To make sure the connection is active, every second a keep-alive message is sent to the server. I have noticed that if I unplug the network cable and reinsert it quickly, the first 2 or 3 keep-alive messages after the reinsert are never sent. I tested this by running wire-shark on the server. I have seen it take up to 5 seconds before the client starts sending out network traffic again. The client is running under Linux (2.6.2), if that helps.

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  • How to get `gcc` to generate `bts` instruction for x86-64 from standard C?

    - by Norman Ramsey
    Inspired by a recent question, I'd like to know if anyone knows how to get gcc to generate the x86-64 bts instruction (bit test and set) on the Linux x86-64 platforms, without resorting to inline assembly or to nonstandard compiler intrinsics. Related questions: Why doesn't gcc do this for a simple |= operation were the right-hand side has exactly 1 bit set? How to get bts using compiler intrinsics or the asm directive Portability is more important to me than bts, so I won't use and asm directive, and if there's another solution, I prefer not to use compiler instrinsics. EDIT: The C source language does not support atomic operations, so I'm not particularly interested in getting atomic test-and-set (even though that's the original reason for test-and-set to exist in the first place). If I want something atomic I know I have no chance of doing it with standard C source: it has to be an intrinsic, a library function, or inline assembly. (I have implemented atomic operations in compilers that support multiple threads.)

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  • What web server should I use if I want to run Java code behind it?

    - by Boaz
    At the moment, I have lot's of Java which does all kind of nifty stuff and I'm happy with it. The code is command line driven which have been great so far, but I recently decided I want to make the functionality available through web-services. Since my is complex and I'm happy with the way it's written , I don't want go through the pain of porting it to other languages. So I set out on a google journey to find out what web servers exist (on a Linux machine, though it's interesting to hear the answer without that limitation). From what I could find, it seems that there are two viable options: Apache Tomcat and Sun Java Server. What are the reason to choose one on top of the other? what are the strength of each and what are the weaknesses? Or, perhaps, there is a third one which is much easier, flexible and less cumbersome. Anyone?

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