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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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PGI compile problem with lanczos_sse2.hpp
by Brian Carnes 05 Oct '10

05 Oct '10

I am trying to link to a library that uses some code from boost. So far I have been able to build the code under gcc, intel and pathscale compilers. However, I get about 100 errors from this file under pgi (versions 7.1, 7.2 and 10.1) boost/boost/math/special_functions/detail/lanczos_sse2.hpp I have copied the first few error messages to the end of this email. My suspicion is that some settings are not correct for this compilation under PGI. I did check that the header files used by "lanczos_sse2.hpp" were present. I don't have any experience with the SSE/SSE2 optimizations. FYI, our build system uses bjam, so there is a Jamfile for boost, which I can send if needed. Thanks for any assistance, -Brian ****** pgi 7.1 compile errors ******** "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 26: error: identifier "align" is undefined static const ALIGN16 double coeff[26] = { ^ "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 26: error: expected a ";" static const ALIGN16 double coeff[26] = { ^ "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 54: error: a global-scope declaration may not have this storage class register __m128d vx = _mm_load1_pd(&x); ^ "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 54: error: identifier "x" is undefined register __m128d vx = _mm_load1_pd(&x); ^ "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 55: error: a global-scope declaration may not have this storage class register __m128d sum_even = _mm_load_pd(coeff); ^ "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 55: error: identifier "coeff" is undefined register __m128d sum_even = _mm_load_pd(coeff); ^ "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 56: error: a global-scope declaration may not have this storage class register __m128d sum_odd = _mm_load_pd(coeff+2); ^ "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 57: error: a global-scope declaration may not have this storage class register __m128d nc_odd, nc_even; ^ "/scratch/SIERRA_TRILINOS/code/TPLs_src/boost/boost/math/special_functions/detail/lanczos_sse2.hpp", line 57: error: a global-scope declaration may not have this storage class register __m128d nc_odd, nc_even; ^

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[serialization] boost::serialization adds huge amounts of exports to resultant Windows PE file
by Chris Yuen 04 Oct '10

04 Oct '10

Hey guys, I am using boost::serialization from 1.44.0. One thing that I noticed is that linking statically to the serialization libs will add several hundred exports in the final exe file that I get. Using `dumpbin /exports my_program.exe` Here's a brief illustration: Let's say we have a typical Hello World program (code example at the end of this message) that uses `iostream`. Here's what we get when we run `dumpbin /exports my_program.exe`. Dump of file my_program.exe File Type: EXECUTABLE IMAGE Summary 4000 .data 2000 .pdata 7000 .rdata 1000 .rsrc 18000 .text However, if we just add 6 lines of code to include boost::serialization (code example at the end of this message), we would get tons of exports. Dump of file my_program.exe File Type: EXECUTABLE IMAGE Section contains the following exports for my_program.exe 00000000 characteristics 4CA376FA time date stamp Thu Sep 30 01:27:22 2010 0.00 version 1 ordinal base 14 number of functions 14 number of names ordinal hint RVA name 1 0 00029480 ??_B?1??get_instance@?$singleton@V?$map@Vtext_oarchive@archive@boost@@@?A0xca82ee40@detail@archive@boost@@@serialization@boost@@CAAEAV?$map@Vtext_oarchive@archive@boost@@@?A0xca82ee40@detail@archive@3@XZ@51 = ??_B?1??get_instance@?$singleton@V?$map@Vtext_oarchive@archive@boost@@@?A0xca82ee40@detail@archive@boost@@@serialization@boost@@CAAEAV?$map@Vtext_oarchive@archive@boost@@@?A0xca82ee40@detail@archive@3@XZ@51 (`private: static class boost::archive::detail::`anonymous namespace'::map<class boost::archive::text_oarchive> & __cdecl boost::serialization::singleton<class boost::archive::detail::`anonymous namespace'::map<class boost::archive::text_oarchive> >::get_instance(void)'::`2'::`local static guard'{2}') 2 1 000294B0 ??_B?1??get_instance@?$singleton@V?$multiset@PEBVextended_type_info@serialization@boost@@Ukey_compare@detail@23@V?$allocator@PEBVextended_type_info@serialization@boost@@@std@@@std@@@serialization@boost@@CAAEAV?$multiset@PEBVextended_type_info@serialization@boost@@Ukey_compare@detail@23@V?$allocator@PEBVextended_type_info@serialization@boost@@@std@@@std@@XZ@51 = ??_B?1??get_instance@?$singleton@V?$multiset@PEBVextended_type_info@serialization@boost@@Ukey_compare@detail@23@V?$allocator@PEBVextended_type_info@serialization@boost@@@std@@@std@@@serialization@boost@@CAAEAV?$multi ...elided This is indeed very strange since compiling a `exe` file shouldn't get me any of these "exports" at all. Anyone has an idea what's going wrong? I am using MSVS2005 Release|x64. I compiled boost with `bjam threading=multi link=static runtime-link=static toolset=msvc-8.0`. Thank you for guidance in advance! Best regards, Chris Yuen // Source code to my_program.exe #include <iostream> #include <sstream> // Uncommenting the following block would introduce tons of // exports in the final exe. Even though this block of code // is never executed. //#include <boost/archive/text_oarchive.hpp> //void nothing() { //std::stringstream stream; //boost::archive::text_oarchive oa(stream); //} int main() { using namespace std; std::cout << "Hello World" << std::endl; return 0; }

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[Log] When Boost.Log will became part of Boost?
by Daniele Barzotti 04 Oct '10

04 Oct '10

Hi, this just to ask if someone known when boost.log will be inserted into the main boost tree. Regards, Daniele.

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[Exception] Issue with exception_ptr.hpp when compiling with qcc (gcc V4.4.2)
by christopher.pohl＠etas.com 04 Oct '10

04 Oct '10

Hi all, I'm getting an error using Boost.Exception V1.44 when trying to compile a file which #include's <boost/exception_ptr.hpp> with a QNX 6.5.0 toolchain (gcc 4.4.2): C:/QNX650/host/win32/x86/usr/bin/qcc -Vgcc_ntoppc -c -O -Wc,-Wall -DNDEBUG -I. -IC:/QNX650/target/qnx6/usr/include -EB -me500v2 X:/WORKSPACE/test_boost_exception/tc1.cpp In file included from X:/WORKSPACE/test_boost_exception/boost/exception_ptr.hpp:9, from X:/WORKSPACE/test_boost_exception/tc1.cpp:2: X:/WORKSPACE/test_boost_exception/boost/exception/detail/exception_ptr.hpp:69: error: looser throw specifier for 'virtual boost::exception_detail::bad_alloc_::~bad_alloc_()' X:/WORKSPACE/test_boost_exception/boost/exception/exception.hpp:255: error: overriding 'virtual boost::exception::~exception() throw ()' cc: C:/QNX650/host/win32/x86/usr/lib/gcc/powerpc-unknown-nto-qnx6.5.0/4.4.2/cc1plus caught signal 1 Is there an explicit destructor definition missing in the derived class boost::exception_detail::bad_alloc_ ? --- boost/exception/detail/exception_ptr.hpp +++ patched/boost/exception/detail/exception_ptr.hpp @@ -67,6 +67,7 @@ boost::exception, std::bad_alloc { + virtual ~bad_alloc_() throw() {} }; template <int Dummy> Thanks for your help. Christopher

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