September 2006 - Boost-users - lists.preview.boost.org

[serialization] How to serialize an object using a reference to its base class ?
by x y 28 Sep '06

28 Sep '06

Hi, I'm new to boost and I'm having some trouble serializing an object using a reference to its base class. Although there are a lot of messages related to this topic in the newsgroups and the doc, I did not find a workable answer to my proplem. In the following code, the function serialize takes a reference to base_class as parameter. But the serialize method of derived_class is never called. Did I miss something ? Thanks for your help Marc #include <string> #include <sstream> #include <iostream> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/access.hpp> #include <boost/serialization/is_abstract.hpp> #include <boost/serialization/export.hpp> using namespace std; class base_class { friend class boost::serialization::access; public: base_class() : my_string("") { }; base_class(string s) : my_string(s) { }; virtual ~base_class() {}; virtual void foo(void) = 0; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(my_string); } public: string my_string; }; BOOST_IS_ABSTRACT(base_class); BOOST_CLASS_EXPORT(base_class); class derived_class : public base_class { friend class boost::serialization::access; public: derived_class() : base_class(), my_int(0) {}; derived_class(string s, int i) : base_class(s), my_int(i) {}; virtual ~derived_class() {}; void foo(void) {}; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(base_class) & BOOST_SERIALIZATION_NVP(my_int); } int my_int; }; BOOST_CLASS_EXPORT(derived_class); void serialize(const base_class& src, std::ostream& dest) { boost::archive::binary_oarchive oa(dest); oa << BOOST_SERIALIZATION_NVP(src); } int main(int argc, char** argv) { try { std::stringstream ss; derived_class d("aaa", 5); cout << "before: " << d.my_string << " " << d.my_int << endl; serialize(d, ss); // deserialize derived_class d2; boost::archive::binary_iarchive ia(ss); ia >> d2; cout << "after: " << d2.my_string << " " << d2.my_int << endl; } catch (const std::exception& ex) { cout << "std exception: " << ex.what() << endl; } catch (...) { cout << "unknown exception" << endl; } } --------------------------------- Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls. Great rates starting at 1¢/min.

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[Serialization]: SIGSEGV on Mingw32, during global static data initialization (runs ok on Linux)
by Jeffrey Chang 28 Sep '06

28 Sep '06

Hi, I've been using boost Serialization library (release v1_33_1) on Linux without problems, with g++ compiler of both v3.3.6 & v4.1.1. My program serialzes boost::shared_ptr of polymorphic types, and BOOST_CLASS_EXPORT() and BOOST_SERIALIZATION_SHARED_PTR() are used. However, when the same program is ported & run on mingw32 (w/ g++ v3.4.5 on WinXP), it generates SIGSEGV before my main() is called. and here's the stack trace: Program received signal SIGSEGV, Segmentation fault. 0x6e3759a3 in boost::archive::detail::basic_serializer::basic_serializer ( this=0x4, eti=@0x813484) at /opt/boost/boost_1_33_1/boost/archive/detail/basic_serializer.hpp:37 37 {} (gdb) bt #0 0x6e3759a3 in boost::archive::detail::basic_serializer::basic_serializer ( this=0x4, eti=@0x813484) at /opt/boost/boost_1_33_1/boost/archive/detail/basic_serializer.hpp:37 #1 0x6e34220b in boost::archive::detail::basic_oserializer::basic_oserializer (this=0x0, eti=@0x813484) at /opt/boost/boost_1_33_1/libs/serialization/build/../src/basic_oserializer.cpp:24 #2 0x005fb394 in boost::archive::detail::pointer_oserializer<HmcBase, boost::archive::text_oarchive>::pointer_oserializer (this=0x813164) at /opt/boost/boost_1_33_1/boost/serialization/extended_type_info_typeid.hpp:95 #3 0x00477c12 in __static_initialization_and_destruction_1 ( __initialize_p=8467588, __priority=65535) at /opt/boost/boost_1_33_1/boost/archive/detail/oserializer.hpp:198 #4 0x004c5a57 in __main () at /opt/boost/boost_1_33_1/boost/archive/detail/oserializer.hpp:198 #5 0x00404568 in main (argc=1, argv=0x3d45f8) at ../../src/HmcMain.cpp:231 (gdb) I cannot connect the logic between stack frame #3 and #2; it seems trying to instantiate some global static data when SIGSEGV happens. Is there some dependency on order of global static data initialization to be satisfied for using BOOST_CLASS_EXPORT/BOOST_SERIALIZATION_SHARED_PTR? HmcBase is the base class for my polymorphic types, and all my code are statically linked, while "boost_serialization-mgw-d-1_33_1.dll" is used here. I saw some discussion in this mailing list on "Serializing classes defined in DLLs"<http://news.gmane.org/find-root.php?message_id=%3c432FF0C3.5010002%40intopi…>a year ago, but don't know what's the current status on it and whether this case is related to it. Thanks for any hit, --- Jeffrey

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boost-sandbox releases on sf.net
by Markus Werle 28 Sep '06

28 Sep '06

Hi! This is me sitting behind a virtual fence that hinders cvs access to the boost-sandbox. Fetching all the files by hand via web-interface is a no-go. Could someone be so nice and provide weekly snapshots of the sandbox from the download page at sf.net? regards, Markus

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Re: [Boost-users] [Graph] find cycles
by Sohail Somani 27 Sep '06

27 Sep '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Michele Russo > Sent: Wednesday, September 27, 2006 12:52 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] [Graph] find cycles > > Hi all, > > Please, couold you suggest me a simple way to find a cycle > into a graph (just a sentence, no code)? What about the > computational complexity? In a sentence: DFS.

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[Graph] find cycles
by Michele Russo 27 Sep '06

27 Sep '06

Hi all, Please, couold you suggest me a simple way to find a cycle into a graph (just a sentence, no code)? What about the computational complexity? Best regards, Michele __________________________________________________ Do You Yahoo!? Poco spazio e tanto spam? Yahoo! Mail ti protegge dallo spam e ti da tanto spazio gratuito per i tuoi file e i messaggi http://mail.yahoo.it

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Using boost::lambda on AIX with xlC version 6
by Jerry Jeremiah 26 Sep '06

26 Sep '06

> Hello, I would appreciate any help with this. I am trying to compile this test program on AIX with xlC (VisualAge C++ Professional / C for AIX Compiler, Version 6): #include <iostream> // cout #include <vector> // vector #include <algorithm> // for_each #include "boost/lambda/lambda.hpp" using namespace boost::lambda; main() { std::vector<int> a; a.push_back(1); std::for_each(a.begin(), a.end(), std::cout << _1 << ' '); } And I get: "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-0219 (S) The call to "detail::select" has no best match. "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1228 (I) Argument number 1 is an lvalue of type "const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda: :bitwise_action<boost::lambda::leftshift_action>,boost::tuples::tuple<std::basi c_ostream<char,std::char_traits<char> > &,boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,bo ost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost: :tuples::null_type,boos...". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1228 (I) Argument number 2 is an lvalue of type "int". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1228 (I) Argument number 3 is an lvalue of type "const boost::tuples::null_type". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1228 (I) Argument number 4 is an lvalue of type "const boost::tuples::null_type". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1228 (I) Argument number 5 is an lvalue of type "const boost::tuples::null_type". "./boost/lambda/detail/select_functions.hpp", line 27.1: 1540-1202 (I) No candidate is better than "boost::lambda::detail::select<boost::lambda::lambda_functor_base<boost::l ambda::bitwise_action<boost::lambda::leftshift_action>,boost::tuples::tuple<std ::basic_ostream<char,std::char_traits<char> > &,boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,bo ost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost: :tuples::null_type,boost::tuples::null_type>...". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 1 to "const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda: :bitwise_action<boost::lambda::leftshift_action>,boost::tuples::tuple<std::basi c_ostream<char,std::char_traits<char> > &,boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,bo ost::tuples::null_type,boost::tuples::null_type,boost::tuples::nu..." uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 2 to "int &" uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 3 to "const boost::tuples::null_type &" uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 4 to "const boost::tuples::null_type &" uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 5 to "const boost::tuples::null_type &" uses "the identity conversion". "./boost/lambda/detail/select_functions.hpp", line 22.13: 1540-1202 (I) No candidate is better than "boost::lambda::detail::select<const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda: :bitwise_action<boost::lambda::leftshift_action>,boost::tuples::tuple<std::basi c_ostream<char,std::char_traits<char> > &,boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,bo ost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost: :tuples:...". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 1 to "const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda: :bitwise_action<boost::lambda::leftshift_action>,boost::tuples::tuple<std::basi c_ostream<char,std::char_traits<char> > &,boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,bo ost::tuples::null_type,boost::tuples::null_type,boost::tuples::nu..." uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 2 to "int &" uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 3 to "const boost::tuples::null_type &" uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 4 to "const boost::tuples::null_type &" uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-1231 (I) The conversion from argument number 5 to "const boost::tuples::null_type &" uses "the identity conversion". "./boost/lambda/detail/operator_lambda_func_base.hpp", line 212.1: 1540-0700 (I) The previous message was produced while processing "boost::lambda::lambda_functor_base<class boost::lambda::bitwise_action<boost::lambda::leftshift_action>,class boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functo r_base<boost::lambda::bitwise_action<boost::lambda::leftshift_action>,boost::tu ples::tuple<std::basic_ostream<char,std::char_traits<char> > &,boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,boost::tuples::null_type,boost::tuples::null_t...". "./boost/lambda/detail/lambda_functors.hpp", line 145.3: 1540-0700 (I) The previous message was produced while processing "boost::lambda::lambda_functor<class boost::lambda::lambda_functor_base<boost::lambda::bitwise_action<boost::lambda: :leftshift_action>,boost::tuples::tuple<boost::lambda::lambda_functor<boost::la mbda::lambda_functor_base<boost::lambda::bitwise_action<boost::lambda::leftshif t_action>,boost::tuples::tuple<std::basic_ostream<char,std::char_traits<char> > &,boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,boost::tuples::null_ty...". "/usr/vacpp/include/algorithm", line 77.13: 1540-0700 (I) The previous message was produced while processing "std::for_each<std::_Ptrit<int,long,int *,int &,int *,int &>,boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lamb da::bitwise_action<boost::lambda::leftshift_action>,boost::tuples::tuple<boost: :lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::bitwi se_action<boost::lambda::leftshift_action>,boost::tuples::tuple<std::basic_ostr eam<char,std::char_traits<char> > &,boost::lambda::lambda_functor<...". "test.cpp", line 13.3: 1540-0700 (I) The previous message was produced while processing "main()".

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[asio] error code 11001
by Christian Henning 26 Sep '06

26 Sep '06

Hi there, I'm having problems to figure out what error code 11001 means. I have an boost::asio::error exception that is thrown inside tcp::resolver::resolve( query ) . So how can I translate this error code into something descriptive. Thanks ahead, Christian

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[asio] demultiplexing non-socket file descriptors
by Bill Somerville 26 Sep '06

26 Sep '06

Hi Having a look at asio as a possible solution for a cleanup of an existing app. It would be nice to extend asio to include non-socket file descriptors. I realise that this would not be portable to Windows, but does asio provide extension points to add this functionality, also adding PF_LOCAL sockets would be handy as well although these could be switched to a PF_INET implementation with an acceptable performance penalty. Has anyone experimented with extensions like these? TIA -- Bill Somerville This message has been scanned by MailController - www.MailController.altohiway.com

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[Boost Test] 1.35 - setting up VC 7 IDE to link with Boost.Test
by Robert Ramey 26 Sep '06

26 Sep '06

Using VC 7.1 I have a VC Solution with all my test programs. These use the serialization library and boost test - test_exec_monitor. I've recently wanted to make some changes in 1.35 and now none of my projects link anymore. They build with bjam but I can't get them linked with VC 7 IDE. I don't have autolink suppressed. There is no message indicating that it can't find file test.....lib. What I get is undefined symbols. This i od to me as I don't use any symbosl unit_test .... I've also tried including the library unit_test_framework. That doesn't seem to help either. Any suggestions would be appreciated. Robert Ramey test_simple_class.obj : error LNK2019: unresolved external symbol "void __cdecl boost::test_tools::tt_detail::check_impl(class boost::test_tools::predicate_result const &,class boost::basic_wrap_stringstream<char> &,class boost::unit_test::basic_cstring<char const >,unsigned int,enum boost::test_tools::tt_detail::tool_level,enum boost::test_tools::tt_detail::check_type,unsigned int,...)" (?check_impl@tt_detail@test_tools@boost@@YAXABVpredicate_result@23@AAV?$basic_wrap_stringstream@D@3@V?$basic_cstring@$$CBD@unit_test@3@IW4tool_level@123@W4check_type@123@IZZ) referenced in function "int __cdecl test_main(int,char * * const)" (?test_main@@YAHHQAPAD@Z) test_simple_class.obj : error LNK2019: unresolved external symbol "public: void __thiscall boost::unit_test::unit_test_log_t::set_checkpoint(class boost::unit_test::basic_cstring<char const >,unsigned int,class boost::unit_test::basic_cstring<char const >)" (?set_checkpoint@unit_test_log_t@unit_test@boost@@QAEXV?$basic_cstring@$$CBD@23@I0@Z) referenced in function "int __cdecl test_main(int,char * * const)" (?test_main@@YAHHQAPAD@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::exception_caught(class boost::execution_exception const &)" (?exception_caught@unit_test_log_t@unit_test@boost@@UAEXABVexecution_exception@3@@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::assertion_result(bool)" (?assertion_result@unit_test_log_t@unit_test@boost@@UAEX_N@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_unit_aborted(class boost::unit_test::test_unit const &)" (?test_unit_aborted@unit_test_log_t@unit_test@boost@@UAEXABVtest_unit@23@@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_unit_skipped(class boost::unit_test::test_unit const &)" (?test_unit_skipped@unit_test_log_t@unit_test@boost@@UAEXABVtest_unit@23@@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_unit_finish(class boost::unit_test::test_unit const &,unsigned long)" (?test_unit_finish@unit_test_log_t@unit_test@boost@@UAEXABVtest_unit@23@K@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_unit_start(class boost::unit_test::test_unit const &)" (?test_unit_start@unit_test_log_t@unit_test@boost@@UAEXABVtest_unit@23@@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_aborted(void)" (?test_aborted@unit_test_log_t@unit_test@boost@@UAEXXZ) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_finish(void)" (?test_finish@unit_test_log_t@unit_test@boost@@UAEXXZ) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_start(unsigned long)" (?test_start@unit_test_log_t@unit_test@boost@@UAEXK@Z) MSVCRTD.lib(crtexe.obj) : error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup

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autolink include guard ?
by Robert Ramey 26 Sep '06

26 Sep '06

I notice that when my tests build I get Linking to lib file: libboost_serialization-vc71-mt-gd-1_35.lib Linking to lib file: libboost_serialization-vc71-mt-gd-1_35.lib I was curious as to why I go two such messages. Looking at auto_link.hpp I see that there is no include guard no a #pragma once. Is there a reason for this? Robert Ramey

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