June 2011 - Boost-users - lists.preview.boost.org

boost build and link problems
by Littlefield, Tyler 10 Jun '11

10 Jun '11

Hello all: I'm trying to use boost::asio in an app. I used the bootstrap.bat and then bjam to build and configure boost. I use the visual studio 2008 command prompt because when I run bootstrap.bat from the normal command prompt, I get: cl.exe - System Error The program can't start because mspdb100.dll is missing from your computer. Try reinstalling the program to fix this problem. the build is building vc100 libs, but when I try to build my app it's trying to link to vc90 libs. I am using 2008, so I am confused as to why this is working out to build vc100 libs. When I build: 1>LINK : fatal error LNK1104: cannot open file 'libboost_system-vc90-mt-gd-1_46_1.lib' so it looks like it's trying to link to vc90 libs when vc100 are all that's being built. Is there a way to get rid of this and build for vs 2008? -- Take care, Ty my website: http://tds-solutions.net blog: http://tds-solutions.net/blog skype: st8amnd127 My programs don't have bugs; they're randomly added features!

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Asio SSL verify peer
by Lloyd 10 Jun '11

10 Jun '11

Hi, Checking asio::ssl sample, the client side code contains a way to verify the server certificate as ctx.set_verify_mode(boost::asio::ssl::context::verify_peer); ctx.load_verify_file("ca.pem"); What parameters are checked by this function? Is it possible to check the parameters in certificate file manually? (I have gone through openssl manual, it seems openssl has functions for that) And also how can I do a client authentication using SSL? Thanks a lot, Lloyd

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enable_shared_from_this::weak_from_this() request
by Marat Abrarov 10 Jun '11

10 Jun '11

Hi, boost users and experts. I often use boost::enable_shared_from_this. I know - it contains boost::weak_ptr, which is initiated in the details of boost::shared_ptr's constructor. Also sometimes I need function weak_from_this() at the classes derived from boost::enable_shared_from_this. For now I use something like: class my_class : public boost::enable_shared_from_this<my_class> , private boost::noncopyable { ...somewhere in my_class details... private: typedef my_class this_type; typedef boost::weak_ptr<this_type> this_type_weak_ptr; this_type_weak_ptr weak_from_this() { return this_type_weak_ptr(shared_from_this()); } }; // my_class But as I know restoring shared_ptr from weak_ptr (done in shared_from_this()) is quite expensive. So my_class::weak_from_this() does unnecessary work instead of just copy internal weak_ptr stored in enable_shared_from_this. So the question is: why there is no weak_from_this() member function in boost::enable_shared_from_this class? Regards, Marat Abrarov.

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Boost.Log V1. error on QNX6.4 "boost::filesystem::create_directories: File exists: "blabla"
by Jinqiang Zhang 10 Jun '11

10 Jun '11

The "blabla" in title is the path where I ran the application I got this exception when trying to logging first record. The console log shows up then the exception thrown. In initializing code, I create an boost::log::sinks::text_file_backend with a parameter "boost::log::keywords::file_name = logs/%Y-%m-%d_%H-%M-%S-%N.log" I tested the same code on Windows XP and Linux(Debian), it works. help please. Jinqiang ZHANG

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How to use make_bfs_visitor (and/or time_stamper)
by David Doria 10 Jun '11

10 Jun '11

I figured out how to make a custom visitor for a BFS search: http://programmingexamples.net/index.php?title=CPP/Boost/BGL/BreadthFirstSe… but now I am trying to figure out what make_bfs_visitor does, and use it, potentially in conjunction with boost::time_stamper http://programmingexamples.net/index.php?title=CPP/Boost/BGL/MakeBFSVisitor Would anyone mind taking a look there to see where I am going wrong. You can see I tried a lot of things that didn't work :) Thanks, David

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Serialization TextArchive are Cross-Language?
by Marco Piacentini 09 Jun '11

09 Jun '11

Hy...I try to explain better my question... Im using boost serialization text archive before sending data over TCP connection... Now I need to pass the received data to a Java application...so I would know if the serialized stream is composed only by the data or by the data + boost serialization(tag, code, etc.)... In this case my only chance to transfer the data to the java application, is to filter them before transfering?thanks...

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More boostcon videos
by Marshall Clow 09 Jun '11

09 Jun '11

Bartoz (Tuesday): http://blip.tv/boostcon/haskell-the-pseudocode-language-for-c-template-meta… Tony (Wednesday): http://blip.tv/boostcon/lockfree-programming-part-2-data-structures-5258064 Cliff (Wednesday); http://blip.tv/boostcon/design-journeys-with-skoot-a-peer-oriented-generic-… I'm hoping to get about half of the videos up before I go on holidays next week. -- Marshall -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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Re: [Boost-users] [statechart] Is it possible to have nested (sub)states in an asynchronous state machine?
by Igor R 09 Jun '11

09 Jun '11

> Putting everything into one file, surprisingly for me, solved my problem of > not being able to nest a sub-state under a super state. Now I need to figure > out why the previous implementation (i.e., the one distributed over multiple > files) does not compile. I guess you try to use undefined (forward-declared) types in contexts where they cannot be used.

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Re: [Boost-users] [statechart] Is it possible to have nested (sub)states in an asynchronous state machine?
by Gurcan Gulesir 09 Jun '11

09 Jun '11

> I belive, you can reproduce it in one single file, > which we could just copy&paste into an empty file, and try to compile. > It should go like this: > > // states definition... > // machine definition... > int main() >{ > // machine instantiation >} Ok. Please see the attached file in which I put the whole source code. Putting everything into one file, surprisingly for me, solved my problem of not being able to nest a sub-state under a super state. Now I need to figure out why the previous implementation (i.e., the one distributed over multiple files) does not compile. Ultimately, I should be able to distribute my actual state machine implementation to multiple files for better scalability, readability, maintainability, etc. I will investigate further and announce the outcome. Needless to say, I would also very much appreciate if you would be willing to quickly point out where I went wrong in the previous implementation.

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[Boost::Thread] Unable to declare boost::thread in a dll problem
by kmdarkmaster 09 Jun '11

09 Jun '11

Hello, Please help me I have a weird problem while testing Boost::Thread. I can create threads and do stuffs without problem when compiled as an exe, but unable to declare even a single thread when compiled as a dll. (I'm using MS Visual Studio 2010 pro). In fact, when I create a win32 console application and use this code, it compiles perfectly : /*********************coooooode*********************/ #include "stdafx.h" #include <boost\thread.hpp> int _tmain(int argc, _TCHAR* argv[]) { boost::thread myThread; return 0; } /**************************************************/ Now I create a DLL application, create a cpp, and write the same simple code : /********************coooooodddeee***********************/ #include "stdafx.h" #include <boost\thread.hpp> void testDLL_Thread(){ boost::thread myThread; } /*******************************************************/ My DLL has the same boost configuration as the console app, and it doesn't even export anything. Now during compilation, i get those Linker error : /************RAAAAGGGEE***************/ LNK1169: un ou plusieurs symboles définis à différentes reprises ont été rencontrés LNK2005: "public: __thiscall boost::thread::~thread(void)" (??1thread@boost@@QAE@XZ) déjà défini(e) dans boost_thread-vc100-mt-gd-1_46_1.lib(boost_thread-vc100-mt-gd-1_46_1.dll) LNK2005: "public: __thiscall boost::thread::thread(void)" (??0thread@boost@@QAE@XZ) déjà défini(e) dans boost_thread-vc100-mt-gd-1_46_1.lib(boost_thread-vc100-mt-gd-1_46_1.dll) /**************************************/ Sorry for the French stuffs but you guys know those errors for sure I know that many people have already created threads in DLL, so please help me understand why it didn't work in this simple case. Thank you very much, kmdarkmaster -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-Thread-Unable-to-declare-boost-thr… Sent from the Boost - Users mailing list archive at Nabble.com.

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