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Mailing list outage on Friday, January 12 2007
by Doug Gregor 10 Jan '07

10 Jan '07

There will be a short mailing list outage on Friday, January 12th while we migrate the Boost mailing lists to a new, more powerful server. The migration will occur in the following time-frame: - 06:00am-10:00am Pacific US time - 07:00am-11:00am Mountain US time - 08:00am-12:00pm Central US time - 09:00am-01:00pm Indiana time - 09:00am-01:00pm Eastern US time - 02:00pm-06:00pm GMT All of the Boost mailing lists hosted at lists.boost org, along with their mail archives, will be unavailable during this time. Doug Gregor Open Systems Lab @ Indiana University

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[boost.mpl] Implementing a numeric index access to fields of a composite class created with mpl::inherit_linearly
by Khalil Shalish 10 Jan '07

10 Jan '07

Hello, I created the following composite class using mpl::inherit_linearly: template <class T> struct DataField { T data; } typedef mpl::inherit_linearly< mpl::vector< int, int, int> mpl::inherit< DataField<_2>, _1 > > Int3Composite; Int3Composite int3comp; Since the type of each data field is an int, I cannot use the type of the field to access the data in the field. Q: Is there a way to write a template (call it get_field) to access the data using numeric position in the type sequence. Something like this: int field_0 = get_field<0>(in3comp); //This returns the first int data field. int field_1 = get_field<1>(int3comp); I am very new to C++ template programming and any help on this will be very much appreciated. Thank you, Khalil Shalish kshalish(a)austin.rr.com

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operators << and >> on boost serialization
by Miguel Silvestre 10 Jan '07

10 Jan '07

Ok! I'm starting to freaking out, because I just can't figure it out some compilation errors when trying to use the boost serialization library. I just can't manage what I'm doing wrong. Ok, I think that the best way to translate my problem is to post the code and the changes I'm trying to do: So ans as you can see on the attached file: My project and all of my classes are inside a namespace the FlowEngine. I have 3 classes: A; B and C to test the boost serialization. As it is now it compiles and runs good. But I take the comments of class A to split member serialization, just doing that I get this errors when compiling: \3rdparty\include\boost\serialization\access.hpp(93) : error C2662: 'void FlowEngine::A::save<Archive>(Archive &,const unsigned int)' : cannot convert 'this' pointer from 'const FlowEngine::A' to 'FlowEngine::A &' with [ Archive=boost::archive::text_oarchive ] Conversion loses qualifiers \3rdparty\include\boost\serialization\split_member.hpp(43) : see reference to function template instantiation 'void boost::serialization::access::member_save<Archive,const T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\serialization\split_member.hpp(42) : while compiling class template member function 'void boost::serialization::detail::member_saver<Archive,T>::invoke(Archive &,const T &,const unsigned int)' with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\serialization\split_member.hpp(69) : see reference to class template instantiation 'boost::serialization::detail::member_saver<Archive,T>' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \samples\silvestre\main2.cpp(82) : see reference to function template instantiation 'void boost::serialization::split_member<Archive,FlowEngine::A>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\serialization\access.hpp(109) : see reference to function template instantiation 'void FlowEngine::A::serialize<Archive>(Archive &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive ] \3rdparty\include\boost\serialization\serialization.hpp(81) : see reference to function template instantiation 'void boost::serialization::access::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\serialization\serialization.hpp(140) : see reference to function template instantiation 'void boost::serialization::serialize<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(152) : see reference to function template instantiation 'void boost::serialization::serialize_adl<Archive,T>(Archive &,T &,const unsigned int)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(145) : while compiling class template member function 'void boost::archive::detail::oserializer<Archive,T>::save_object_data(boost::archive::detail::basic_oarchive &,const void *) const' with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(163) : see reference to class template instantiation 'boost::archive::detail::oserializer<Archive,T>' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(162) : while compiling class template member function 'const boost::archive::detail::basic_oserializer &boost::archive::detail::pointer_oserializer<T,Archive>::get_basic_serializer(void) const' with [ T=FlowEngine::A, Archive=boost::archive::text_oarchive ] \3rdparty\include\boost\archive\detail\oserializer.hpp(515) : see reference to class template instantiation 'boost::archive::detail::pointer_oserializer<T,Archive>' being compiled with [ T=FlowEngine::A, Archive=boost::archive::text_oarchive ] \3rdparty\include\boost\archive\detail\interface_oarchive.hpp(58) : see reference to function template instantiation 'const boost::archive::detail::basic_pointer_oserializer &boost::archive::detail::instantiate_pointer_oserializer<Archive,T>(Archive *,T *)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(344) : see reference to function template instantiation 'const boost::archive::detail::basic_pointer_oserializer *boost::archive::detail::interface_oarchive<Archive>::register_type<T>(const T *)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(343) : while compiling class template member function 'const boost::archive::detail::basic_pointer_oserializer *boost::archive::detail::save_pointer_type<Archive,TPtr>::non_abstract<T>::register_type(Archive &)' with [ Archive=boost::archive::text_oarchive, TPtr=FlowEngine::A *, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(360) : see reference to class template instantiation 'boost::archive::detail::save_pointer_type<Archive,TPtr>::non_abstract<T>' being compiled with [ Archive=boost::archive::text_oarchive, TPtr=FlowEngine::A *, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(460) : see reference to function template instantiation 'const boost::archive::detail::basic_pointer_oserializer *boost::archive::detail::save_pointer_type<Archive,TPtr>::register_type<FlowEngine::A>(Archive &,T &)' being compiled with [ Archive=boost::archive::text_oarchive, TPtr=FlowEngine::A *, T=FlowEngine::A ] \3rdparty\include\boost\archive\detail\oserializer.hpp(447) : while compiling class template member function 'void boost::archive::detail::save_pointer_type<Archive,TPtr>::invoke(Archive &,const TPtr)' with [ Archive=boost::archive::text_oarchive, TPtr=FlowEngine::A * ] \3rdparty\include\boost\archive\detail\oserializer.hpp(536) : see reference to class template instantiation 'boost::archive::detail::save_pointer_type<Archive,TPtr>' being compiled with [ Archive=boost::archive::text_oarchive, TPtr=FlowEngine::A * ] \3rdparty\include\boost\archive\basic_text_oarchive.hpp(78) : see reference to function template instantiation 'void boost::archive::save<Archive,const T>(Archive &,const T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A * ] \3rdparty\include\boost\archive\detail\interface_oarchive.hpp(78) : see reference to function template instantiation 'void boost::archive::basic_text_oarchive<Archive>::save_override<T>(T &,int)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A * ] \3rdparty\include\boost\archive\detail\interface_oarchive.hpp(86) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator <<<const T>(T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A * ] \samples\silvestre\main2.cpp(190) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator &<FlowEngine::A*>(T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A * ] And if I just change the operator & with the operators << or >> on the silv task class I get this compilation errors: 3rdparty\include\boost\archive\detail\oserializer.hpp(567) : error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' with [ x=false ] d:\flow project\flowengine\3rdparty\include\boost\archive\basic_text_oarchive.hpp(78) : see reference to function template instantiation 'void boost::archive::save<Archive,T>(Archive &,T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A * ] d:\flow project\flowengine\3rdparty\include\boost\archive\detail\interface_oarchive.hpp(78) : see reference to function template instantiation 'void boost::archive::basic_text_oarchive<Archive>::save_override<T>(T &,int)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A * ] d:\flow project\flowengine\samples\silvestre\main2.cpp(190) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_oarchive<Archive>::operator <<<FlowEngine::A*>(T &)' being compiled with [ Archive=boost::archive::text_oarchive, T=FlowEngine::A * ] Anyone??? Pleaaaaseeeee??????????? -- Miguel Silvestre

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Re: [Boost-users] [date_time] timezone rules for different years
by Stephen Turner 10 Jan '07

10 Jan '07

> -----Original Message----- > Date: Wed, 10 Jan 2007 08:12:18 -0700 > From: Jeff Garland <jeff(a)crystalclearsoftware.com> > > Yes, sorry I was off the net on holiday for an extended > period :-) Finally getting caught up now... > Thanks! > I would recommend that this be created as an alternative > tz_database class -- > something like 'historic timezone database'. My experience > is that must > applications don't need the historic data and hence only > really care about > loading up the current set of rules. I'm sure that's true for many users. But I also wonder how many users there are who do care but haven't had a problem until now because they're in countries where the rules haven't changed in recent years, so it's just worked. But let me put it the other way round. If a historical database were available, why would anyone choose to still use the existing method? Assuming the new method didn't impose a noticeable speed or memory constraint, of course. -- Stephen Turner, Cambridge, UK http://homepage.ntlworld.com/adelie/stephen/ "The internet is a reflection of our society. If we do not like what we see, the problem is not to fix the mirror, we have to fix society." (Vint Cerf)

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Re: [Boost-users] Support for extended Daylight Saving Time in 2007
by Stephen Turner 10 Jan '07

10 Jan '07

> Date: Wed, 10 Jan 2007 08:17:38 -0700 > From: Jeff Garland <jeff(a)crystalclearsoftware.com> > > Yep, in fact I was looking for someone that has time to look > at this carefully > to do this update and send me a patch -- someone about a > month ago said they > would do this, but haven't seen anything yet. You certainly need to change 1;0;4 to 2;0;3 and -1;0;10 to 1;0;11 for all U.S. and Canadian locations. (At least, all locations that observe DST). I have read that Mexico isn't changing, but I'm not sure about Caribbean or Central American countries. -- Stephen Turner, Cambridge, UK http://homepage.ntlworld.com/adelie/stephen/ "The internet is a reflection of our society. If we do not like what we see, the problem is not to fix the mirror, we have to fix society." (Vint Cerf)

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[Threads] join_all() strange behavior?
by Manuel Jung 10 Jan '07

10 Jan '07

Hi, I have a strange problem. The destructor of a class calls join_all(). But it seems that he hangs there. Even though some other code behind the join_all() is executed before it finishs! Lets get concret: seal::~seal() { ThgPrgs.join_all(); cout<<"Crabd quits, goodbye"<<endl; } When i run my program, the last message is "Crabd quits, goodbye" and it should exit then, but it doesnt. If i stop it running in gdb an do a backtrace i get the following: #0 0xffffe410 in __kernel_vsyscall () #1 0xb7c796c8 in pthread_join () from /lib/tls/i686/cmov/libpthread.so.0 #2 0xb7d21e6a in boost::thread::join () from /usr/local/lib/libboost_thread-gcc-mt-1_33_1.so.1.33.1 #3 0xb7d224ee in boost::thread_group::join_all () from /usr/local/lib/libboost_thread-gcc-mt-1_33_1.so.1.33.1 #4 0x0808742c in ~seal (this=0x80c9890) at src/seal.cpp:20 #5 0x0808eb55 in checked_delete<seal> (x=0x80c9890) at /usr/local/include/boost/checked_delete.hpp:34 #6 0x0809566a in boost::detail::sp_counted_impl_p<seal>::dispose (this=0x80dc410) at /usr/local/include/boost/detail/sp_counted_impl.hpp:76 #7 0x0805950f in boost::detail::sp_counted_base::release (this=0x80dc410) at /usr/local/include/boost/detail/sp_counted_base_gcc_x86.hpp:145 #8 0x08059555 in ~shared_count (this=0x8103e04) at /usr/local/include/boost/detail/shared_count.hpp:159 #9 0x0808dd1c in ~shared_ptr (this=0x8103e00) at src/seal.h:39 #10 0x08089182 in ~tcp_connection (this=0x8103df8) at src/seal.cpp:212 #11 0x08094273 in checked_delete<tcp_connection> (x=0x8103df8) at /usr/local/include/boost/checked_delete.hpp:34 #12 0x080967d0 in boost::detail::sp_counted_impl_p<tcp_connection>::dispose (this=0x80dcf00) at /usr/local/include/boost/detail/sp_counted_impl.hpp:76 #13 0x0805950f in boost::detail::sp_counted_base::release (this=0x80dcf00) at /usr/local/include/boost/detail/sp_counted_base_gcc_x86.hpp:145 #14 0x08059555 in ~shared_count (this=0x80dc4e8) at /usr/local/include/boost/detail/shared_count.hpp:159 #15 0x0808ddc6 in ~shared_ptr (this=0x80dc4e4) at src/seal.h:66 #16 0x0808e69f in ~value (this=0x80dc4e4) at src/seal.cpp:232 #17 0x0808e700 in ~list3 (this=0x80dc4e0) at src/seal.cpp:232 #18 0x0808e766 in ~bind_t (this=0x80dc4d8) at src/seal.cpp:232 #19 0x080910a7 in ~accept_handler (this=0x80dc4c0) at /usr/local/include/boost/asio/detail/reactive_socket_service.hpp:1228 ---Type <return> to continue, or q <return> to quit--- #20 0x08095595 in ~op (this=0x80dc4b0) at /usr/local/include/boost/asio/detail/reactor_op_queue.hpp:355 #21 0x080918db in boost::asio::detail::reactor_op_queue<int>::op <boost::asio::detail::reactive_socket_service<boost::asio::ip::tcp, boost::asio::detail::epoll_reactor<false> >::accept_handler<boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> >, boost::_bi::bind_t<void, boost::_mfi::mf2<void, tcp_server, boost::shared_ptr<tcp_connection>, boost::asio::error const&>, boost::_bi::list3<boost::_bi::value<tcp_server*>, boost::_bi::value<boost::shared_ptr<tcp_connection> >, boost::arg<1> > > > >::destroy_handler (base=0x80dc4b0) at /usr/local/include/boost/asio/detail/reactor_op_queue.hpp:355 #22 0x080709d2 in boost::asio::detail::reactor_op_queue<int>::op_base::destroy (this=0x80dc4b0) at /usr/local/include/boost/asio/detail/reactor_op_queue.hpp:294 #23 0x0806df75 in boost::asio::detail::reactor_op_queue<int>::destroy_operations (this=0x80c99a8) at /usr/local/include/boost/asio/detail/reactor_op_queue.hpp:245 #24 0x0806d677 in boost::asio::detail::epoll_reactor<false>::shutdown_service (this=0x80c9970) at /usr/local/include/boost/asio/detail/epoll_reactor.hpp:108 #25 0x0806c2ec in ~service_registry (this=0x80c98d8) at /usr/local/include/boost/asio/detail/service_registry.hpp:53 #26 0x0806ba81 in ~io_service (this=0x80c98d4) at src/seal.cpp:8 #27 0x08087648 in ~seal (this=0x80c9890) at src/seal.cpp:32 #28 0x0808eb55 in checked_delete<seal> (x=0x80c9890) at /usr/local/include/boost/checked_delete.hpp:34 #29 0x0809566a in boost::detail::sp_counted_impl_p<seal>::dispose (this=0x80da710) at /usr/local/include/boost/detail/sp_counted_impl.hpp:76 #30 0x0805950f in boost::detail::sp_counted_base::release (this=0x80da710) at /usr/local/include/boost/detail/sp_counted_base_gcc_x86.hpp:145 #31 0x08059555 in ~shared_count (this=0xbfa2e124) at /usr/local/include/boost/detail/shared_count.hpp:159 #32 0x0808dd1c in ~shared_ptr (this=0xbfa2e120) at src/seal.h:39 #33 0x080a8d68 in boost::shared_ptr<seal>::reset (this=0x80c8824) at /usr/local/include/boost/shared_ptr.hpp:231 #34 0x080a863e in main (argc=1, argv=0xbfa2e204) at src/crabd.cpp:71 The class seal holds some other classes in shared_ptrs which are will be destroyed in this moment too. Some of them have also a join_all() in their destructors. Im wondering if they produce the lock? But the main question here is: I read "Crabd quits, goodbye" and after this i stop the program and i get in the backtrace from gdb the line "#4 0x0808742c in ~seal (this=0x80c9890) at src/seal.cpp:20". And Line 20 in seal.cpp is the line with join_all(). How is this possible, though join_all should block? Thanks for your help and for reading this. Manuel Jung, Germany

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Re: [Boost-users] Support for extended Daylight Saving Time in 2007
by Stephen Turner 10 Jan '07

10 Jan '07

> Date: Mon, 8 Jan 2007 21:25:24 -0500 > From: "Eric Yankowitz" <nnews(a)swiftdesign.com> > Subject: [Boost-users] Support for extended Daylight Saving Time in > 2007 > > Been trying to find information describing boost's level of > support for the > four week Daylight Saving Time extension in the US that will > occur this > March. > (http://geography.about.com/cs/daylightsavings/a/dst.htm) I haven't > been able to find very much. A lot of software is having > issues and was > wondering if Boost was ready for the event? > > Was able to find these links, which suggested issues: > > > http://sourceforge.net/tracker/index.php?func=detail&aid=14717 > 23&group_id=7586&atid=207586 > > > http://sourceforge.net/tracker/index.php?func=detail&aid=14786 > 19&group_id=7586&atid=207586 > > Any idea if these are being resolved? And if any others exist? > Eric, I'm a new user of this code, so take everything I say with the appropriate amount of caution, but I have looked into this question a little. My conclusion is that the date_time library is still shipping with the old timezone rules at the moment. It's easy to change the date_time_zonespec.csv file to use the new rules instead (you can do that yourself, and I assume that the official version will do it soon too). However, at the moment the code doesn't seem to support different timezone rules for different years, so once you've changed it, you're out of luck if you want to look up times in 2006. See my previous post about this subject at http://article.gmane.org/gmane.comp.lib.boost.user/23837 Hope that helps, -- Stephen Turner, Cambridge, UK http://homepage.ntlworld.com/adelie/stephen/ "The internet is a reflection of our society. If we do not like what we see, the problem is not to fix the mirror, we have to fix society." (Vint Cerf)

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Boost: unordered library installation problem
by chun ping wang 10 Jan '07

10 Jan '07

I tried building the boost unordered library and i get like this error. exactly how do i build the boost unordered library. 'boost-build C:\cygwin\home\Chun ping Wang\boostBeta\unordered/../boost/tools /build/v2 ;' but we were unable to find "bootstrap.jam" in the specified directory or in BOOST_BUILD_PATH (searching C:\cygwin\home\Chun ping Wang\boostBeta\unorde red/../boost/tools/build/v2).

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BOOST_CHECK and functions with more than one template parameter
by Rob Caldecott 09 Jan '07

09 Jan '07

I am trying to test a template function that takes two template parameters, and, because of the "comma in macros" compiler issue, I have hit a brick wall. For example: template<typename T1, typename T2> int func(const T1& t1, const T2& t2) { ... } BOOST_CHECK_EQUAL(func<std::string, int>("Test", 1234), 1234); When compiling BOOST_CHECK_EQUAL above, I get an error due to the comma between std::string and int. As this is a function, I cannot use typedef, and trying to #define a workaround also fails (I am using VS2005). Any ideas how I can test template functions with more than one template parameter? Thanks in advance.

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GCC_BIN_DIRECTORY problem
by remi 09 Jan '07

09 Jan '07

hi i cross compile boost but i see that it impossible tu use the correct GCC with the command GCC_BIN_DIRECTORY How can i compile with another gcc ??!! best regards __________________________________________________ Do You Yahoo!? En finir avec le spam? Yahoo! Mail vous offre la meilleure protection possible contre les messages non sollicités http://mail.yahoo.fr Yahoo! Mail

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