March 2009 - Boost-users - lists.preview.boost.org

choosing from a list of types based on a runtime value
by Hicham Mouline 06 Mar '09

06 Mar '09

say I have a template <typename Tag> // Tag should be 1 in 10 types struct S { ... }; in a function f(int Tag) // Tag is computed here at runtime { switch(Tag) { case 0: // use S<Tag0> ... case 9: // use S<Tag9> } } Is fusion the lib to help with problems like this, so I don't need to write the full switch case for all types, regards,

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boost:interprocess sizeof(list<Type>::Node)
by waterbed 06 Mar '09

06 Mar '09

Hello, My problem is really basic : I have N objects of type Type to store in a boost::interprocess::list<Type>. The question is easy : How many bytes should I provide to the managed_mapped_file, in order it fits correctly? So, I supposed I had to store (let's assume bi = boost::interprocess): + The list allocator : sizeof( bi::allocator<Type, bi::managed_shared_memory::segment_manager> ) + The struct of the list itself : sizeof( bi::list<Type, bi::allocator<Type, ...> > ) + The N nodes of the list containing each one of my objects : sizeof( bi::list<Type, ...>::Node) First issue : bi::list<Type, ...>::Node is private. Fine, I changed it as public. Second issue : sizeof(bi::list<Type, ...>::Node) was not enough, actually I can't add N objets, I was just able to allocate (N - x) objets Third issue : so I tried to fix the value of x, but x is not constant, it changes according to N... Thus I think, I made a mistake but where? or I forgot something but what? Thank for your help and your advises. -- View this message in context: http://www.nabble.com/boost%3Ainterprocess-sizeof%28list%3CType%3E%3A%3ANod… Sent from the Boost - Users mailing list archive at Nabble.com.

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Interprocess windows_shared_memory 1.35
by Joy Vincent 06 Mar '09

06 Mar '09

I am attempting to create a windows_shared_memory object for a large file that exists using Boost 1.35. I have attempted to create it 2 ways: interprocess::windows_shared_memory *wsm = new interprocess::windows_shared_memory(interprocess::open_or_create, fileName.c_str(), interprocess::read_only,fileSize); I am getting an interprocess exception that the system cannot find the path specified. (boost::error_info is 'not_found_error') The file is valid as previous boost::filesystem calls can successfully create a path object, append a file name and get the file size. The file is large (110MB) so I also attempted a size of 1000 -- same exception. After stepping through some code, it seems I am getting the exception in win32_api.hpp when the CreateFileMappingA is called. Has anyone had issues with windows_shared_memory objects in the 1.35 version? Thanks. Joy

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tcp::acceptor works differently on windows than linux.
by Michael Dehmlow 06 Mar '09

06 Mar '09

I'm writting a multiplatform app which uses a tcp::acceptor. Thread one does: { std::cout<<"Oh but I interupted: "<<std::endl; _myTCPAcceptor->close(); std::cout<<"Done interupting "<<std::endl; } std::cout<<"About to join "<<std::endl; _myAcceptorThread->join(); std::cout<<"Join complete"<<std::endl; Thread two does: { boost::system::error_code ec; boost::asio::socket_base::non_blocking_io command(false); _mySocket.io_control(command,ec); boost::system::error_code ec1; std::cout<<"About to accept "<<std::endl; _myTCPAcceptor->accept(_mySocket,ec1); std::cout<<boost::system::system_error(ec1).what()<<std::endl; std::cout<<"done with the accept"<<std::endl; } Output is: Linux Redhat: About to accept Oh but I interupted: Done interupting About to join ... blocks forever Windows XP: About to accept Oh but I interupted: Done interupting About to join A blocking operation was interrupted by a call to WSACancelBlockingCall done with the accept Join complete on windows xp pro the call populates error code with: A blocking operation was interrupted by a call to WSACancelBlockingCall Any solutions other wise I gotta go to pocking the acceptor with another socket connection :(. -- View this message in context: http://www.nabble.com/tcp%3A%3Aacceptor-works-differently-on-windows-than-l… Sent from the Boost - Users mailing list archive at Nabble.com.

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[regex] How to pass BOOST_REGEX_RECURSIVE to bjam build process (win32)
by Christian Hoffmann 06 Mar '09

06 Mar '09

Hi, we used to compile boost regex in boost version 1.36 with the following command: bjam.exe -sHAVE_ICU=1 -sICU_PATH=../../../../icu -sBOOST_REGEX_RECURSIVE toolset=msvc-7.1 threading=multi python-debugging=on link=shared variant=debug --without-mpi libs\regex\build When switching to boost 1.38, we realized that BOOST_REGEX_RECURSIVE is not passed/picked up anymore when using the same command (apart compiler version to compile (verified with some added pragma messages): How should this be configured nowadays? Or did it never work that way but the default behaviour changed? Maybe the user-config.jam file should be used, but I didn't find an example of how to do this. Thanks a lot, Chris

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BoostCon Registration
by Robert Jones 06 Mar '09

06 Mar '09

BoostCon registration seems to be broken. I started the reg. process, received the confirmation email, followed the link in the email, which gave "Page Not Found". Is there anyone on here who can help? Thanks, Rob.

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[Proto] Annoying MSVC bug
by Dave Jenkins 06 Mar '09

06 Mar '09

Almost every useful Proto program has workarounds for an MSVC bug that causes syntax errors on valid nested function types. Eric Niebler filed a bug report with Microsoft on 6/14/2007 and they closed it on 6/19/2007 with status "Closed(Won't Fix)". This is back in the days of Visual Studio 2005. I'd like to encourage Microsoft to reopen this bug report and fix it. Could any of you with logins to Microsoft Connect go here https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?Feedb… and answer their 3 question survey expressing your dissatisfaction and encourage them to fix this. Thanks, Dave Jenkins

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boost library advice wanted
by Sean Farrow 06 Mar '09

06 Mar '09

Hi: I am in the process of implementing a program that turned commands from voice recognition software in to code that are entered in to an application. there are approximately 200 codes available in this particular sofware I am automating. Wile I could use boost::stringAlgo along with the functions available in the stl there must be a better alternative. To give an idea of howthis would work the user might say: conditional new line, and [l] would be placed in the current document onscreen. the user could say skip 5 lines and [sk5] would be entered.

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xcode iphone vs regular project issues
by Tom Delorenzi 06 Mar '09

06 Mar '09

Hi. I have worked on boost before using Visual Studios and loved using it. I am using a mac for some development now with xcode. My question is 2 fold. First off, on a regular c++ project I can use boost no problem, but I haven't seen how to get the auto complete to list functions through the -> operator. Has anyone had luck? In visual studios i could include the header and the non template header in my project to get this functionality to work. Second question is, when developing a project that was created using the iphone template the program fails to compile when I include any boost.h files, even though I am including them in the exact same way that was succesfull in the c++ project. Has anyone tried this?

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xcode smart pointers
by Tom Delorenzi 06 Mar '09

06 Mar '09

I figured out both my problems. Boost works fine in iphone projects, you just need to have all your source code end in .mm to enable objective-c++ and the other problem is caused because xcode cannot handle templates when it comes to code insight(or namespaces supposidly). Thats really unfortunate.

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