- Boost-users - lists.boost.org

Re: [Boost-users] Users! Who'd like to wave goodbye to #ifdef
by Paul Kerchen 06 Oct '10

06 Oct '10

+1 for removing VC6 support. Paul Kerchen

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Re: [Boost-users] Problems with boost 1.44.0 and MSVC: deque problem seems solved, but the boost::ctor problem remains
by Yana A Kireyonok (aka Iron Bug) 06 Oct '10

06 Oct '10

> Date: Tue, 5 Oct 2010 11:37:35 +0200 > From: Igor R <boost.lists(a)gmail.com> > 2010/10/5 Yana A Kireyonok (aka Iron Bug) <death.iron.bug(a)gmail.com>: >> Greetings, ppl. >> I've got strange problems with the latest stable boost (1.44.0) and >> MSVS studios 2005 and 2010. >> ... > According to your description, it seems that the issue you encountered > is only a symptom of some memory-management issue in your code >..... Well, it could happen if I wasn't a professional programmer (over 15 years of real time systems hardware and software programming). It's not a typical beginners mistake, for sure. I wouldn't bother ppl in here if I hadn't checked all possible variants and wasn't sure it was really something out of order. > Date: Tue, 5 Oct 2010 12:38:02 +0000 > From: David Ward <davidjward30(a)hotmail.com> > >> Greetings, ppl. >> I've got strange problems with the latest stable boost (1.44.0) and >> MSVS studios 2005 and 2010. >> > Hi, > You might want to check out this known bug with std::deque in MSVC. It's due > to be fixed in VC11: > https://connect.microsoft.com/VisualStudio/feedback/details/533131/bug-in-s… > Regards, > David. Yes, this is very possible! I performed some more experiments, encountering the bug issue you mentioned and in my case it seems being the pop_front method that ruins the iterators, despite of using interlocking mechanism. Perhaps, it's the matter of timings: that's why it doesn't trigger when I use other locking methods. But I should uproot using deques in my code, anyway. It may show up again on faster or slower machines. Well, I will be aware of danger of using deques in MSVS. Never liked MS, to say the truth... :) But have to deal with it sometimes. Still, remains the question what to do with constructor of boost::thread in MSVS 2010. It fails with access violation, without any specific conditions, in simple plain piece of code.

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[Fusion] fusion vector transformation into another fusion vector transformation.
by alfC 05 Oct '10

05 Oct '10

I have class that is parameterized by several type (Boost::Unit units type). template<class U1, class U2, ... > class A{ A(quantity<U1> q1, quantity<U2> q2, ... ){} }; since the number of arguments is arbitrary I though it would be a good idea to use either MPL sequence and Tuples. Or better yet a fusion::vector. so the class will be parametrized by a fusion::vector or unit types. template<class FusionOfUnits> //or class MPLofUnits class A{ A(FusionOfQuantities fq){} //or TupleOfUnits }; The questions is: ¿what is the best way to transform a fusion::vector<unit1, unit2, unit3, ..., unitN > into a fusion::vector<quantity<unit1>, quantity<unit2>, quantity<unit3>, ..., quantity<unitN> > whete the N is (compile-time) arbitrary, i.e. the lenght of the fist fusion::vector is arbitrary (If you are not familiar with Boost.Units, unitN is just a type and quantity is a template type.) Thank you, Alfredo

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timezone database discrepancy
by archie14 05 Oct '10

05 Oct '10

I am calculating start/end time of the daylight savings time using tz_database and default timezone database file "date_time_zonespec.csv" that comes with boost 1_44. I found discrepancy between results of the calculation for "America/Chicago" region and published data. for years 2010-2007 the results match. However, for the 2006 calendar year, published results from several sources are: Start: April 2 End: October 29 and calculated results are: Start: March 12 End November 5 I will appreciate any advise/comments on how to deal with this issue.

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Re: [Boost-users] [proto] need explanation in implementing distributive law
by Mauro Bianco 05 Oct '10

05 Oct '10

Hi all, It is probably already been discovered by everyone at this point, but the code proposed by Andrew does not to work properly to apply distributivity more than once in an expression [works for a*(b+c) but not for a*(b+c*(d+c)) ] Here a modified version that seems to work recursively. How does it look? struct distr : proto::or_< proto::when< proto::multiplies< proto::_, proto::plus< proto::_, proto::_ > >, proto::call<distr( // THIS IS TO RECURSE proto::_make_plus( proto::_make_multiplies( proto::_left, proto::_left( proto::_right ) ), proto::_make_multiplies( proto::_left, proto::_right( proto::_right ) ) ) ) > >, proto::otherwise<proto::nary_expr<proto::_, proto::vararg<distr> > > > {}; Regards, Mauro. On 22.03.2010 22:11, Andrew Durward wrote: > As a follow-up, the attached code seems to compile and yield the expected > result. > > andrew > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Serialize a class, call new() in constructor
by Michael Reichlin 05 Oct '10

05 Oct '10

Hi everybody, actually i have a big problem with serializing some of my classes. The problem is, that classA class calls new of classB in constructor and after that the load_construct_data is called and also calls a new of classB. So I have two objects of classB. Here is my code: classA.h: class CClassA { template<class Archive> friend void serialize(Archive &ar, CClassA &cCClassA, const unsigned int version); template<class Archive> friend void save_construct_data(Archive &ar, const CClassA *cCClassA, const unsigned int version); template<class Archive> friend void load_construct_data(Archive &ar, CClassA *cCClassA, const unsigned int version); // *** Aufzählungen **************************************************************************** public: CClassB* pClassB; // *** Methoden ******************************************************************************** private: protected: int iTest; public: CClassA(int iTest); // Konstruktor virtual ~CClassA(); // Destruktor // Get/Set-Methoden }; classA.cpp: CClassA::CClassA(int iTest) :iTest(iTest) { pClassB = new CClassB(iTest); } classB.h: class CClassB { template<class Archive> friend void serialize(Archive &ar, CClassB &cCClassB, const unsigned int version); template<class Archive> friend void save_construct_data(Archive &ar, const CClassB *cCClassB, const unsigned int version); template<class Archive> friend void load_construct_data(Archive &ar, CClassB *cCClassB, const unsigned int version); // *** Aufzählungen **************************************************************************** public: // *** Datenmember ***************************************************************************** private: protected: public: // *** Methoden ******************************************************************************** private: protected: int iTestInt; public: CClassB(int iTest); // Konstruktor virtual ~CClassB(); // Destruktor // Get/Set-Methoden static unsigned int count; }; serialize.h template<class Archive> void serialize(Archive &ar, CClassA &cCClassA, const unsigned int version) { ar & boost::serialization::make_nvp("ClassB", cCClassA.pClassB ); } template<class Archive> void save_construct_data(Archive &ar, const CClassA *cCClassA, const unsigned int version) { ar << boost::serialization::make_nvp("Test", cCClassA->iTest); } template<class Archive> void load_construct_data(Archive &ar, CClassA *cCClassA, const unsigned int version) { int iTest; ar >> boost::serialization::make_nvp("Test", iTest); ::new(cCClassA) CClassA(iTest); } template<class Archive> void serialize(Archive &ar, CClassB &cCClassB, const unsigned int version) { } template<class Archive> void save_construct_data(Archive &ar, const CClassB *cCClassB, const unsigned int version) { ar << boost::serialization::make_nvp("Test", cCClassB->iTestInt); } template<class Archive> void load_construct_data(Archive &ar, CClassB *cCClassB, const unsigned int version) { int iTest; ar >> boost::serialization::make_nvp("Test", iTest); ::new(cCClassB) CClassB(iTest); } Now I just want that only one ClassB will be created. How can I recognize, that ClassB is already generate through cons tructor classA. I just want to serialize the members of classB. Is there a way to solve my problem?? Best regards Michael

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[Boost.Log] Problem : Logs with channel and severity
by Aman Feri 05 Oct '10

05 Oct '10

Hello. It's my first post here... I'll try to be quick and sharp. i apologise if i fail. I spend a long time reading the Boost.Log documentation, but I'm lost. I try to generate logs with this Format : [ProcessId][ThreadId[TimeStamp][Channel][Severity] Text For now i succeeded this Format : [ProcessId][ThreadId[TimeStamp][][] Text Here's what i did. Header : ------------------------- class Trace { public : enum SeverityLevels {...}; enum Channels{...}; typedef boost::log::sources::severity_channel_logger_mt< SeverityLevels, // the type of the severity level Channels // the type of the channel name > MyLogger; // logger type public : static MyLogger m_channel1; // one channel <-> one logger static MyLogger m_channel2; // one channel <-> one logger ... public : static void init(); // initialisation }; ------------------------- Source : ------------------------- void Trace::init() { boost::log::add_common_attributes(); init_log_to_file ( ... boost::log::keywords::format = "[%ProcessID%][%ThreadID%][%TimeStamp%][%Channel%][%Severity%]: %_%" ); } ------------------------- And i somewhere implemented a #define that make this compilable : ------------------------- TRACE(channel_networking,debug) << "Logs enabled" << 4; ------------------------- The problematic code is that one, that i try to add in my init() function : ------------------------- boost::shared_ptr< boost::log::sinks::synchronous_sink< boost::log::sinks::basic_text_file_backend< char > > > pBackend; pBackend = boost::log::init_log_to_file(...); pBackend->locked_backend()->set_formatter(boost::log::formatters::stream << boost::log::formatters::attr< Channels >("Channel")); ------------------------- I try here to add a formater to the backend part of the sink i just created with init_log_to_file(...) And i somewhere defined this operator : ------------------------- std::ostream& operator<< (std::ostream& strm, Trace::Channels const& val) ------------------------- The result is : - compilation is OK - linking is OK - running is OK (no exception throwed) - but my log file is empty. Thanks x 1 to every reader of this message. Thanks x 2 to every answerer to this message Thanks x 4 to every helper

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weird boost::asio problems opening acceptor
by andrew.marlow＠uk.bnpparibas.com 05 Oct '10

05 Oct '10

I have a server where there must be only one instance of it for a given machine on a given port number. Here is the code I used to try to make that happen: boost::asio::io_service ios; boost::asio::ip::tcp::endpoint primaryEndpoint(boost::asio::ip::tcp::v4(), primaryPort); std::auto_ptr<boost::asio::ip::tcp::acceptor> primaryAcceptor; try { primaryAcceptor.reset(new boost::asio::ip::tcp::acceptor(ios, primaryEndpoint)); primaryAcceptor->open(primaryEndpoint.protocol()); primaryAcceptor->set_option(boost::asio::ip::tcp::acceptor::reuse_address(true)); primaryAcceptor->bind(primaryEndpoint); } catch(std::exception& ex) { std::cout << "Error: Cannot obtain port " << primaryPort << ", " << ex.what() << ", server must be already running." << std::endl; } It always prints the error. The error is 'Already open'. The exception gets thrown from the call to open. What am I doing wrong please? If don't do the open etc then I can run up a second instance and it will have the port also. It is as if SO_REUSEADDR is true. I always thought that SO_REUSEADDR was false by default. When I run it in the debugger and breakpoint before the call to open , the process has the port open for listening, as revealed by 'netstat -a'. It is as if it has already done the open with SO_REUSEADDR set to true. I am using boost version 1.42.0 on Windoze-XP compiled with Visual Studio 2005 (don't laugh....). Regards, Andrew Marlow ___________________________________________________________ This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited. Please refer to http://www.bnpparibas.co.uk/en/information/legal_information.asp?Code=ECAS-… for additional disclosures.

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Problems with boost 1.44.0 and MSVC: boost::mutex::scoped_lock and std::deque in multithreaded application
by Yana A Kireyonok (aka Iron Bug) 05 Oct '10

05 Oct '10

Greetings, ppl. I've got strange problems with the latest stable boost (1.44.0) and MSVS studios 2005 and 2010. The first problem I got (it seems being not dependent on boost version) was the heap allocation exception when using mutex::scoped_lock to guard references to std::deque from different threads in multithreaded application. I used MSVS SP1 compiler I checked it with boost 1.41.0 and it appeared there too, so it's not the bug of the latest version, for sure. I was not sure if it wasn't a bug of STL, but the strange thing was that if I used usual mutex lock/unlock functions instead of scoped_lock - it went just perfectly. That's why I decided to ask here, instead of blaming STL. I'm not sure if it's a bug to send it to a buglist. I'm far from being a newbie in multithreading programming, but I cannot guess where it comes from and I've got too little time to get deep into detailed boost debug. I've written a little test application that reveals the problem, I'm not sure if it's a good idea to insert the code right here, but I can send it on request. The second problem raised up when I tried to compile the same test application with MSVS 2010. I didn't use the MSVS 2010 for my application, but I decided to test if it was a problem with STL libs. That result was access violation in the boost::thread constructor. It goes well under MSVS 2005, though. And the constructor is ok when using MSVS 2010 with boost 1.41.0 too. I found some info in the internet that this bug appeared in boost 1.43.0, but was fixed. Bug I could not find it in bugs list of boost, so I decided to ask about it here. Meantime, the problem with heap allocation remained, with MSVS 2010 and boost 1.41.0. I'm not sure what to do with this issues. Maybe these are known problems? Sincerely, Yana.

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Boost: Getting Started on Windows
by Olivier Bertrand 05 Oct '10

05 Oct '10

Using this tutorial I tried to build the first sample with Windows Visual C++ 6.0. All seems correct in the settings, but the compilation failed with the following messages: --------------------Configuration: Sample - Win32 Debug-------------------- Compiling... Lambda.cpp c:\boost_1_44\boost\config\suffix.hpp(588) : error C2039: 'typeinfo' : is not a member of '`global namespace'' c:\boost_1_44\boost\config\suffix.hpp(588) : error C2873: 'typeinfo' : symbol cannot be used in a using-declaration c:\boost_1_44\boost\mpl\aux_\yes_no.hpp(56) : fatal error C1506: unrecoverable block scoping error Error executing cl.exe. Sample.exe - 3 error(s), 0 warning(s) The second sample gave me similar errors. I need help to be able to use the Boost libs...

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