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Re: [Boost-users] XML Serialization Traits Question
by William Bardon 26 Jul '06

26 Jul '06

Robert, Thanks for the example; it helped clear up some uncertainty about the template arguments in the derived class. Regarding save_override, I see where specialized versions for the different trait types are defined in basic_xml_oarchive.ipp. I also see that save_override is called from the operator<< redefinition in interface_oarchive.hpp. What I'm missing is the link between serializing a user-defined class object and the traits of that object. template<class Archive> BOOST_ARCHIVE_OR_WARCHIVE_DECL(void) basic_xml_oarchive<Archive>::save_override(const version_type & t, int) { int i = t.t; // extra .t is for borland write_attribute(VERSION(), i); } This function already displays a version attribute in the XML. How do I make sure this is called for every element? I'm sorry, but I can't figure out how to modify chain of control to force output of class traits. Starting in oserializer.hpp, boost::archive::save<Archive,T> calls static save_non_pointer_type<Archive, T>::invoke calls serialize_adl calls boost::serialization::serialize<Archive, T> calls access::serialize calls myClass::serialize<Archive> (Archive& ar, unsigned int version) There is also a function oserializer<Archive,T>::save_object_data that calls serialize_adl, but I can't find anything that calls it. The struct save_non_pointer_type<Archive, T> in oserializer.hpp may be the key, but I'm not sure how it works. In oserializer.hpp, struct save_non_pointer_type<Archive,T>::save_standard::invoke calls Archive::save_object, but I do not see an implementation of the function anywhere: $ find /usr/include/boost -type f -exec grep -H save_object {} \;| grep -v save_object_ | more /usr/include/boost/archive/polymorphic_oarchive.hpp: virtual void save_object( /usr/include/boost/archive/detail/oserializer.hpp: ar.save_object(& t, oserializer<Archive, T>::instantiate()); /usr/include/boost/archive/detail/basic_oarchive.hpp: void save_object( /usr/include/boost/archive/detail/polymorphic_oarchive_impl.hpp: virtual void save_object( /usr/include/boost/archive/detail/polymorphic_oarchive_impl.hpp: ArchiveImplementation::save_object(x, bos); I'd appreciate any suggestions. Am I even looking in the right place? Thanks in advance, Bill -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Robert Ramey Sent: Wednesday, July 26, 2006 12:14 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] XML Serialization Traits Question "William Bardon" <wbardon(a)cabcds.org> wrote in message news:C73E689C9FCF884B9A550ECFADA0721C087D3E@exchange.cab-cds.org... I have read both the Boost Serialization online documentation and the archives of the Boost-Users mailing list looking for guidance, but I haven't found anything relevant. I see how to use BOOST_CLASS_TRACKING and BOOST_CLASS_IMPLEMENTATION to remove version tracking attributes from the XML tags. Usage of these macros does a lot more than remove attributes from the tags. I want to go in the opposite direction. I notice that the class_id and version attributes only appear the first time an object of a particular class is serialized. I want to force the version attribute to appear in every object's attribute list. Do I need to derive a custom archive to do this? yes I have looked at the source code for serialization, but I have trouble plowing through all of the macros, template expansions, and overloaded functions to locate the specific part that controls whether class traits are stored as attributes in a particular XML tag. I sympathize - its hard to follow. And I wrote it. Here are some hints: a) look at demo_fast_archive.cpp to see a model of how one can derive from an existing archive. b) You'll want to derive from xml_oarchive_impl<...> to create my_xml_oarchive c) add a "save_override" function to my_xml_oarchive which replaces the "save_override" function in basic_xml_oarchive.ipp. Implement this using functions defined basic_xml_oarchive.ipp Good luck - Robert Ramey Thanks in advance, Bill _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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[serialization] basic_xml_iarchive tag checking bugs
by Todd Greer 26 Jul '06

26 Jul '06

Hi, While developing skip_xml_iarchive, I noticed to bugs in basic_xml_iarchive::load_end(). 1. The sense of the check of the flags against no_xml_tag_checking is reversed. By default, checking of xml tag names is not done, contrary to the documentation. If no_xml_tag_checking is passed in as a flag, tag checking is enabled. 2. If tag checking is enabled, and a tag name is encountered that is longer than the name passed in, the name string is accessed past the end of the array. In the expression "name[this->This()->gimpl->rv.object_name.size()]", the index is the size of the encountered name, and could be arbitrarily large. The relevant portion of basic_xml_iarchive::load_end() is included here: if(0 != (this->get_flags() & no_xml_tag_checking)){ if(0 != name[this->This()->gimpl->rv.object_name.size()] || ! std::equal( this->This()->gimpl->rv.object_name.begin(), this->This()->gimpl->rv.object_name.end(), name ) My recommended fix for (1) would be to change no_xml_tag_checking to check_xml_tags, and to change the documentation to reflect this. While the more obvious solution would be to simply fix the comparison, this would introduce a silent behavioral change. My recommended fix will fail to compile for those that have specified no_xml_tag_checking, thus alerting them to the change. My recommended fix for (2) is to replace the excerpted code with: if(0 != (this->get_flags() & check_xml_tags) && rv.object_name != name) The Boost FAQ recommends posting bug reports to the mailing list. Let me know if you would like for me to submit this to the bug repository. -- Todd Greer <tgreer <at> affinegy dot com> Senior Software Developer, Affinegy LLC

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Re: [Boost-users] [serialization] Skipping unexpected elements inXMLarchive
by Todd Greer 26 Jul '06

26 Jul '06

Robert Ramey wrote: > Sounds to me that others might find this useful. How about making a > little write up, and maybe a small test/demo, zipping it up and uploading > to the serialization section of the boost vault? I've uploaded skip_xml_iarchive.zip to the vault in serialization. I've fixed several issues from the version I posted here, and have added a bit of testing and explanation. I hope that people find it useful. Please let me know if you have any questions, or find any problems. If you do find it useful, please let me know that as well. -- Todd Greer <tgreer <at> affinegy dot com> Senior Software Developer, Affinegy LLC

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Re: [Boost-users] how to see the actual value of a'boost::optional<__int64>' in VS2005 debugger
by David Klein 26 Jul '06

26 Jul '06

boost-users-bounces(a)lists.boost.org wrote: > Hi Catherine, > > I am sorry that I don't have any idea about a solution to > your problem. Instead, I myself have a problem to ask for > help to solve. If you happen to know anything about it and > would kindly to help me, I would appreciate it very much. > > I am trying to port Bayes++ into a Visual C++ 2005 project. > The version of Boost library is the latest ( v1.33.1). > However, I came cross a C2064 error that tells "term does not > evaluate to a function taking 0 arguments" when I was > compiling the BayesFilter project, which integrates Boost > header libraries. The error referred to the sentence > > BOOST_UBLAS_INLINE > const_iterator (const iterator &it): > container_const_reference<self_type> (it ()), it_ (it.it _) {} > > at line 293 in file "boost_1_33_1\boost\numeric\ublas\vector.hpp". > > I guess that the problem is related to an incompatibility > between Visual C++ 2005 and the Boost C++ package, and might > be cracked by setting appropriate VC 2005 compiling options > or Boost C++ #dehine's. But I don't have any right ideas to > do so. If you could help, it will be very helpful for me. > > Sincerely, > > Jason Zhang > hi jason, see http://thread.gmane.org/gmane.comp.lib.boost.ublas/2472/focus=2472. btw: you better post UBLAS related questions to the ublas mailing list (ublas <at> lists.boost.org) -- HTH dave

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XML Serialization Traits Question
by William Bardon 26 Jul '06

26 Jul '06

I have read both the Boost Serialization online documentation and the archives of the Boost-Users mailing list looking for guidance, but I haven't found anything relevant. I see how to use BOOST_CLASS_TRACKING and BOOST_CLASS_IMPLEMENTATION to remove version tracking attributes from the XML tags. I want to go in the opposite direction. I notice that the class_id and version attributes only appear the first time an object of a particular class is serialized. I want to force the version attribute to appear in every object's attribute list. Do I need to derive a custom archive to do this? I have looked at the source code for serialization, but I have trouble plowing through all of the macros, template expansions, and overloaded functions to locate the specific part that controls whether class traits are stored as attributes in a particular XML tag. Thanks in advance, Bill

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how to see the actual value of a 'boost::optional<__int64>' in VS2005 debugger
by Catherine 26 Jul '06

26 Jul '06

Hi boost experts, Recently, I noticed that I no longer see the actual value of a 'boost::optional<__int64>'variable in VS2005 debugger. My program is in C++. I recalled that I could find the actual value from the data field of the variable... Anyone encounted this problem? Other than cast the value to be _int64, is there any other way I can work around it? Thanks in advance, Catherine

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Re: [Boost-users] how to see the actual value of a 'boost::optional<__int64>' in VS2005 debugger
by David Klein 26 Jul '06

26 Jul '06

boost-users-bounces(a)lists.boost.org wrote: > Hi boost experts, > > Recently, I noticed that I no longer see the actual value of > a 'boost::optional<__int64>'variable in VS2005 debugger. My program > is in C++. > > I recalled that I could find the actual value from the data field of > the variable... > > Anyone encounted this problem? Other than cast the value to > be _int64, is there any other way I can work around it? > > Thanks in advance, > Catherine > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users hi catherine, +my_int64 +boost::optional_detail::optional_base ... +- +- +m_storage +dummy_ +data +aligner_ +t0 +... +t23 in case of an int64 it is in t4. but this only seems to work for ints. you could also add the following line to %YOUR_MSVS8_DIR%/common7/packages/debugger/autoexp.dat: <snip> boost::optional<__int64>= initialized=<m_initialized> value=<m_storage.dummy_.aligner_.t4> </snip> this changes the display of {...} to f.ex. {initialized=true value=42} -- HTH dave

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uBlas matrix * matrix operation
by Dave Steffen 26 Jul '06

26 Jul '06

Hi Folks, This is my first excursion into uBlas. I'm getting an "ambiguous overload for 'operator*' in 'a * b' " sort of error out of this: #include <boost/numeric/ublas/vector.hpp> #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/matrix_expression.hpp> namespace UB { using namespace boost::numeric::ublas; template <int N> struct Type { typedef matrix<double, row_major, bounded_array<double, N*N> > matrix; }; } // elsewhere... typename UB::Type<N>::matrix a(N,N), b(N,N); for (int i = 0; i < N; ++i) for (int j = 0; j < N; ++j) { a(i,j) = 1.0 / (i + j+1); b(i,j) = 1.0 / (i + j+1); } a * b; The error (from GCC 3.4.6) is this ugly thing: /usr/local/home/dgsteffen/local/GCC34/Boost/1_32/boost/numeric/ublas/matrix_expression.hpp:3632: note: candidates are: typename boost::numeric::ublas::matrix_binary_scalar2_traits<E1, const T2, boost::numeric::ublas::scalar_multiplies<typename E1::value_type, T2>, boost::numeric::ublas::scalar_reference<const T2> >::result_type boost::numeric::ublas::operator*(const boost::numeric::ublas::matrix_expression<E>&, const T2&) [with E1 = boost::numeric::ublas::matrix<double, boost::numeric::ublas::row_major, boost::numeric::ublas::bounded_array<double, 441u, std::allocator<double> > >, T2 = boost::numeric::ublas::matrix<double, boost::numeric::ublas::row_major, boost::numeric::ublas::bounded_array<double, 441u, std::allocator<double> > >] /usr/local/home/dgsteffen/local/GCC34/Boost/1_32/boost/numeric/ublas/matrix_expression.hpp:3162: note: typename boost::numeric::ublas::matrix_binary_scalar1_traits<const T1, E2, boost::numeric::ublas::scalar_multiplies<T1, typename E2::value_type>, boost::numeric::ublas::scalar_reference<const T1> >::result_type boost::numeric::ublas::operator*(const T1&, const boost::numeric::ublas::matrix_expression<E2>&) [with T1 = boost::numeric::ublas::matrix<double, boost::numeric::ublas::row_major, boost::numeric::ublas::bounded_array<double, 441u, std::allocator<double> > >, E2 = boost::numeric::ublas::matrix<double, boost::numeric::ublas::row_major, boost::numeric::ublas::bounded_array<double, 441u, std::allocator<double> > >] Any thoughts on what I'm doing wrong? Thanks! ---------------------------------------------------------------------- Dave Steffen, Ph.D. Software Engineer IV Disobey this command! Numerica Corporation ph (970) 419-8343 x27 fax (970) 223-6797 - Douglas Hofstadter dgsteffen(a)numerica.us ___________________ Numerica Disclaimer: This message and any attachments are intended only for the individual or entity to which the message is addressed. It is proprietary and may contain privileged information. If you are neither the intended recipient nor the agent responsible for delivering the message to the intended recipient, you are hereby notified that any review, retransmission, dissemination, or taking of any action in reliance upon, the information in this communication is strictly prohibited, and may be unlawful. If you feel you have received this communication in error, please notify us immediately by returning this Email to the sender and deleting it from your computer.

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How to cast form string to number safely?
by 袁晓辉 26 Jul '06

26 Jul '06

Dear boost-users: I am really sorry for asking shch a silly question, but I really need your help! boost::lexical_cast is a great function to do casting. If I want is to cast from string to a "long long" type value, I can use the follow: long long llVar = lexical_cast<long long>("123456789"); It is alright in this circs, but what if: lexical_cast<long long>("9999999999999999999999999999999999999999999999999999999999999999999999999999"); This is an obvious overflow, but I have no way to handle this error, it returns a wrong number without throwing an exception! Any suggestion? Thank you very much!!! Kevin

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Re: [Boost-users] shared_ptr and inheritance of the raw pointer
by Nat Goodspeed 26 Jul '06

26 Jul '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org [mailto:boost-users- > bounces(a)lists.boost.org] On Behalf Of Yossi.Itzkovich(a)ecitele.com > Sent: Wednesday, July 26, 2006 3:03 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] shared_ptr and inheritance of the raw pointer > > I have this code: > > #include <boost/shared_ptr.hpp> > > class A{ // base class > public: virtual ~A(); // otherwise A isn't polymorphic, can't downcast > }; > > class B : public A{ > public: > int b1; > }; > > typedef boost::shared_ptr<A> tSmartA; > typedef boost::shared_ptr<B> tSmartB; > > void foo (const tSmartB& smartOne); // need ; for syntax ^^^^^ permits passing an expression > > int main () { > tSmartA a(new B); foo(boost::dynamic_pointer_cast<B>(a)); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > return 0; > } > > > How can I then send a to foo() ? [Nat] With the three changed lines shown above, this compiles for me under MSVC 7.1.

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