February 2006 - Boost-users

Re: [Boost-users] [Serialization]: bug while serializingastd::string
by RIVASSEAU Jean Noel 17 Feb '06

17 Feb '06

Hello I have tried to open an archive in text mode with no_codecvt attribute, like this: std::ifstream ifs("archive.mob"); boost::archive::text_iarchive ia(ifs, boost::archive::no_codecvt); but it still triggers the bug. I do not think the bug is due to something that is not handled in the stream, since I do not have any special characters or stuff like that (except end lines). Plus, the fact that it crashes at the magical number 512 characters get me to think it is more related to a buffer problem, however, you are the specialist. How can I investigate the code conversion facets used by text archive? I am not familiar at all with locales, or facets, but if you give me some hints about how they are used in the BSL, I may get started. Regards Jean-Noël Ps: everything works fine in XML archive mode, so for my project I have switched to that, but I'd still like to get this bug fixed for the benefits of all... _____ De : boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] De la part de Robert Ramey Envoyé : jeudi 9 février 2006 17:11 À : boost-users(a)lists.boost.org Objet : Re: [Boost-users] [Serialization]: bug while serializingastd::string Sorry I got mixed up with another post. The main difference between strstream and other streams is that strstream doesn't do any code conversion. This is also consistent with the idea that something in the string isn't being handled in the code conversion facet of the the stream in the expected manner. a couple of ideas would be to investicate the code conversion facets used by the text archive. Also look at the no_codecvt attribute on archive open. Robert Ramey "RIVASSEAU Jean Noel" <JN.RIVASSEAU(a)oberthurcs.com> wrote in message news:87F60F7FA02FF749AFB02BD9FCAA6B04CB28D4@naserv31.nanterre.oberthurcs.com... I am assuming you meant : std::ofstream ifs("container.mob"); boost::archive::text_oarchive ia(ofs); oa << MyObject; ofs << std::endl; and not std::ifstream ifs. So if I understand well, this "patch" only adds a newline to the archive at the saving stage. I tried it but it did not help in any way; in fact I cannot see how it could help, since the problem is at the point of the loading of the std::string, not at the end of the load of the whole object. What I mean here is that MyObject is, in my case, a class containing a std::vector of pointers to class containing std::strings. One of these strings is too long, which causes the crash. Maybe what you meant is appending the std::endl after the serialization of the std::string, but this is not possible since at this point I have only access to the archive, not the underlying ofstream : template<class Archive> void serialize(Archive & ar, const MyClass& m, const unsigned int version) { ar & m.a_standard_string; } I do not have access there to the underlying ofstream of the implementation. Note that here, MyObject would contain a std::vector < MyClass * >. And I am serializing directly MyObject which causes the serialization of MyClass later. So, what do you mean? Have you located the bug ? _____ De : boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] De la part de Robert Ramey Envoyé : jeudi 9 février 2006 04:46 À : boost-users(a)lists.boost.org Objet : Re: [Boost-users] [Serialization]: bug while serializing astd:string Untl 1.34 comes out try the following on the output stream std::ifstream ofs("container.mob"); boost::archive::text_oarchive ia(ofs); oa << MyObject; ofs << std::endl; "RIVASSEAU Jean Noel" <JN.RIVASSEAU(a)oberthurcs.com> wrote in message news:87F60F7FA02FF749AFB02BD9FCAA6B04C87411@naserv31.nanterre.oberthurcs.com... I have been able to test with a string stream; the bug does not occur. That is, this code produces the bug: std::ifstream ifs("container.mob"); boost::archive::text_iarchive ia(ifs); ia & MyObject; while the following does not: std::ifstream ifs("container.mob"); std::ostringstream tmp; tmp << ifs.rdbuf(); std::istringstream is(tmp.str()); boost::archive::text_iarchive ia(is); ia & MyObject; a) try using a different stream buffer - strstream So do you have any clue, Robert ?? Clearly the problem has to do with buffering somewhere.... Jean-Noël _____ _______________________________________________ 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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[lambda] typeid & abstract base class
by Roman Krylov 17 Feb '06

17 Feb '06

Hi all. I want to make function comparing two typeid's 'const T&'s , but in context I have only two T* pointers. T is abstract class having pure virtual functions. typeid operator takes reference, not pointer. If I use * operator on placeholder (ll_typeid(*_1)==ll_typeid(*_2)) - compiler complains that it could not instantiate T somewhere in some complex template. I also tried to use ll_static_cast in expression, but it didn't help. I don't attach those error messages, but anyway why should T be instantiated to construct L-expression with *(T*)? By the way I made simple functor and it works the way I want, but it's 6 lines long instead of one in_place expr. : > template<typename T> > struct compareRefsByTypeID > { > bool operator()(const T* t1, const T* t2) > { return typeid((const T&)(*t1))==typeid((const T&)(*t2)); } > }; regards, Roman.

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[ptr_container]Bug in ptr_map::erase?
by Bill Buklis 17 Feb '06

17 Feb '06

The following code does not successfully compile: boost::ptr_map<int,int> testmap; testmap.erase(5); The compiler (MSVC 7.1) complains that the identifier "find" is unknown inside the erase function (see below). The class does have a find function as "testmap.find(5)" compiles as expected. I expect it's a mismatch with the embedded classes. Taken directly from associate_ptr_container.hpp: size_type erase( const key_type& x ) // nothrow { BOOST_ASSERT( !this->empty() ); iterator i = find( x ); // ERROR ON THIS LINE if( i == this->end() ) return 0; this->remove( i ); return this->c_private().erase( i.base() ); } The following workaround does work at least, but the above should also, shouldn't it? testmap.erase( testmap.find(5) ); -- Bill Buklis --

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multi_index_container
by Aashit Soni 17 Feb '06

17 Feb '06

Hi all, I am using multi_index_container on MSVC6, WinXP. I ported my existing Hash and order list to multi_index_container. which is working quite expected? a pure vanila hash_index with ordered_index I am facing some problem in fine tuning the hash_index which is slower compared to my previous implementation. I am looking for different ways how can i fine tune the hash_index in multi_index_container? specifically i am yet to discover, How can i set the bucket size for the hash container? How can configure the container for maximum store it can reserve for me in one shot? any other optimization parameter. If any one has some idea. It will be of great help to me. regards, aashit -- A a s h i t

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Re: [Boost-users] linker errors on (regex) on Debian/unstable(gcc-3.4.6)
by Oliver.Kowalke＠infineon.com 17 Feb '06

17 Feb '06

For all how are faced to similar problems: I could solve my problem by downgrading from binutils_2.16.1cvs20060117-1 to binutils_2.15-6 (seams to be a linker-bug). So long, Oliver

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linker errors on (regex) on Debian/unstable (gcc-3.4.6)
by Oliver.Kowalke＠infineon.com 17 Feb '06

17 Feb '06

Hello, I've compiled boost-1.33.1 on Debian/unstable with gcc-3.4.6 and get strange linker errors: `.L408' referenced in section `.rodata' of .libs/sys_error.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail21basic_regex_formatterINS0_19string _out_iteratorISsEENS_13match_resultsIN9__gnu_cxx17__normal_iteratorIPKcS sEESaINS_9sub_matchIS9_EEEEENS_20regex_traits_wrapperINS_12regex_traitsI cNS_16cpp_regex_traitsIcEEEEEEE10format_allEv' of .libs/sys_error.o sys_error.cpp contains: boost::regex e_m("%m"); boost::regex e_e("%e"); std::string f( format); f = boost::regex_replace( f, e_m, msg, boost::match_default | boost::format_sed); return boost::regex_replace( f, e_e, ::strerror( errno), boost::match_default | boost::format_sed); Could you please tell me howto fix this. Regards, Oliver

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Asymmetrical predicates in STL algorithms
by Max Motovilov 17 Feb '06

17 Feb '06

I only stumbled to this problem recently, after happily using the patently unportable solution for years (with numerous versions of STL to boot). Let's say we have a sorted vector of complex objects with a fairly simple key, and want to do lower_bound() on just a key, not a specially constructed instance of the whole object. It turns out that: bool less( const Object&, const Key& ); lower_bound( v.begin(), v.end(), Key(something), ptr_fun(less) ); is expressly prohibited by the SGI STL specifications and not quite allowed, even though not quite prohibited either, by the ISO standard (unless my standardese grew rusty again). It also turns out that there are STLs where it won't work (e.g. the new Plauger's STL shipped with VStudio 2005 release, but not beta 2...). Now, this: struct less { bool operator()( const Object&, const Key& ) const; bool operator()( const Key&, const Object& ) const; }; lower_bound( v.begin(), v.end(), Key(something), less() ); should work everywhere, or so I think. Would be nice to be able to create such an adaptor for a pair of functions (or a pair of bind or lambda expressions for that matter). I blogged a simple solution (for functions only) here http://swsw.motovilov.net/weblogs/swsw/archives/2006/02/asymmetrical_pr.html but am wondering if perhaps I missed a generic solution in one of the Boost libraries, or there's one coming in the new release? Any comments/suggestions? Regards, ...Max...

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compiling just one library
by Adrian Grigore 16 Feb '06

16 Feb '06

Hi, How can I compile just a few of the boost libraries? For example I tried bjam ..... --with-filesystem install, but that did not seem to have any effect, it just resulted in a regular compilation of all libraries. Thanks, Adrian Grigore

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Re: [Boost-users] compiling just one library
by Sohail Somani 16 Feb '06

16 Feb '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Adrian Grigore > Sent: Thursday, February 16, 2006 12:47 PM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] compiling just one library > > Hi, > > How can I compile just a few of the boost libraries? For example I > tried bjam ..... --with-filesystem install, but that did not seem to > have any effect, it just resulted in a regular compilation of > all libraries. cd path/to/library && bjam install usually does it for me.

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[program_options] Multiple segfaults
by David Greene 16 Feb '06

16 Feb '06

I'm starting to use boost::program_options and am not having much luck: >>-home-> ./options_test Got debug value default Got option default Segmentation fault (core dumped) >>-home-> ./options_test --help free(): invalid pointer 0x8fb06f8! free(): invalid pointer 0x8fafcd0! Got debug value default Got option default Segmentation fault (core dumped) >>-home-> ./options_test --help --debug io free(): invalid pointer 0x8a83ec0! free(): invalid pointer 0x8a83ed0! free(): invalid pointer 0x8a83ec8! free(): invalid pointer 0x8a84a38! Segmentation fault (core dumped) At first I thought it might be a problem with the -mt version as my larger application is threaded. But I compiled the testcase attached below as a single-threaded application and it still fails in the same ways. I'm not sure if my use of vector<string> is correct. The documentation is confusing on this point. In http://boost.sourceforge.net/doc/html/program_options/overview.html one example with the "email" option uses multitoken with "string" and another uses "combining" with "vector<string>." Is it not possible to have a combining and multitoken option value? What's the correct value type to use if I want the multiple tokens for the "debug" option to appear as separate items in a vector (or other sequence)? Or do I have to stuff them in a single string and manually parse them out later? -Dave ------------------------ #include <boost/bind.hpp> #include <boost/program_options.hpp> //#include <boost/filesystem/operations.hpp> //#include <boost/filesystem/fstream.hpp> #include <vector> #include <string> #include <iostream> #include <algorithm> #include <iterator> std::ostream &operator<<(std::ostream &out, const std::vector<std::string> &value); std::ostream &operator<<(std::ostream &out, const std::vector<std::string> &value) { std::copy(value.begin(), value.end(), std::ostream_iterator<std::string>(out, " ")); return(out); } namespace test { namespace opt = boost::program_options; //namespace fs = boost::filesystem; static void validate_debug_options(const opt::options_description &debug, const std::vector<std::string> &value) { std::cout << "Got debug value " << value << std::endl; for(std::vector<std::string>::const_iterator i = value.begin(); i != value.end(); ++i) { std::cout << "Got option " << *i << std::endl; } } void process_options(int argc, char **argv) { opt::options_description help("Help options"); opt::options_description debug("Debug options"); opt::options_description cmdline_options; opt::options_description cfgfile_options; help.add_options() ("help", "This help message"); typedef std::vector<std::string> option_vector; option_vector default_debug_flags; default_debug_flags.push_back("default"); debug.add_options() ("debug,d", opt::value<std::vector<std::string> >()-> // For some reason can't find operator<< declared above default_value(default_debug_flags, "default")-> composing()-> multitoken()-> notifier(boost::bind(validate_debug_options, boost::ref(debug), _1)), "Debug flags:\n\n" " foo: \tDo something\n" " bar: \tDo something else\n" " baz: \tDon't do anything\n"); cmdline_options.add(help).add(debug); cfgfile_options.add(debug); opt::variables_map vm; opt::store(opt::parse_command_line(argc, argv, cmdline_options), vm); // fs::ifstream config_file("./opt.cfg"); // if (config_file) { // opt::store(opt::parse_config_file(config_file, cfgfile_options), vm); // } opt::notify(vm); } } int main(int argc, char **argv) { test::process_options(argc, argv); return(0); }

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