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[iterator] iterator_facade operator-> pointee always const
by Tobias Schwinger 22 Dec '04

22 Dec '04

Hi, While using boost::iterator_facade wirh a class type as argument for both the 'Reference' and the 'Value' template type parameter I noticed that I can't access non-const members via operator->. *i is not const and neither 'Value' nor 'Reference' are. A naiv look at the source shows me that operator_arrow_proxy::operator->() always returns 'T const *'. Is this a bug or an intentional restriction ? I'm using the current CVS version (just updated, head revision) and tried to compile with GCC and MSVC. Thanks for any help in advance, Tobias

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Re: [Boost-users] Re: Boost::Serialization Compile error and mytemporarysolution,
by zhengyi 22 Dec '04

22 Dec '04

hello , Robert Ramey In the last lettler , I forgot to tell you the error info of compiler. The msvc71 said that "wchar_t const * " can't be converted to type "std::wstring::const_iterator" , at the file "xml_escape.hpp" line 47. in stlport 4.6.2 , "std::wstring::const_iterator" is "const wchar_t * "(so I was mazed by the error info! ),but in ms-stl(vc71) , "std::wstring::const_iterator" is a nested class in basic_string<>.I don't konw what does stl_port4.53 implemented wstring. Another thing is : when i copy the file "xml_woarchive.cpp" to a simple msvc porject and compile it alone , there is no any error occured , regardless whether stlport is used. I think this is because some macro are difference between jam and ide enviroment , but I'm not sure. Robert Ramey wrote: > >> Do you think the modified code is right ? > >basically yes, it also eliminates a wcslen which is a good thing. I don't unstandard this word. do you talk about Run-Time Library function wcslen() ? in my opinion , with stl string , this function has no use . goodmen(a)x263.net 2004-12-23

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Boost::Serialization Compile error and my temporary solution,
by zhengyi 22 Dec '04

22 Dec '04

Dear Robert Ramey, I'm SO sorry to bother you again! When I compile Boost::Serialization(version 1.32.0) using msvc71+stlport4.6.2, I fond compile error in the file "xml_escape.hpp" line 47. I followed the way compile shown , and find the cause is in file "xml_woarchive_impl.ipp" line 108 . I think it is more reasonable to alter the function like this : /////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////// #ifndef BOOST_NO_STD_WSTRING template<class Archive> void xml_woarchive_impl<Archive>::save(const std::wstring & ws){ typedef iterators::xml_escape<std::wstring::const_iterator> xmbtows; // This is changed by zhengyi !! otherwise ,using stlport can not // compile successfully std::copy( xmbtows(BOOST_MAKE_PFTO_WRAPPER(ws.begin()/*ws.data()*/)), xmbtows(BOOST_MAKE_PFTO_WRAPPER(ws.end()/*ws.data() + ws.size()*/)), boost::archive::iterators::ostream_iterator<wchar_t>(os) ); } #endif //BOOST_NO_STD_WSTRING /////////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////// When I using above code instead yours, the compiler seems happy. and when i switch to ms stl ,that's ok. The original code of yours can pass when using ms-stl , but will fail with stlport. Can you explain that ? Do you think the modified code is right ? How Can I build successfully without alter your code(I like stlport and do not want to define macro BOOST_NO_STD_WSTRING to avoid compile error ) ? Thanks for your patience to read this letter! Merry Christmas!! (two days early ^_^) goodmen(a)x263.net 2004-12-22

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Still having trouble with Mingw and install.
by Ken Perry 22 Dec '04

22 Dec '04

I just did bjam -sTOOLS=MINGW --install >From what I read that is supposed to put the libraries in c:\boost\lib and include in c:\boost\include.. It didn't. Now I think I did that the way the last reply said to so it should ahve worked any ideas? Kenx

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Q: boost::format : can formatting variable arguments lists be done ?
by Dan Dimerman 22 Dec '04

22 Dec '04

Hello, Currently I have a piece of code that logs messages much in the same way as printf() : void MyLogger::dump( const std::string& format, va_list& list ) { const unsigned short buf_size = 1024; char buffer[ buf_size ]; ::memset( buffer, 0, buf_size ); ::_vsnprintf( buffer, buf_size - 1, format.c_str(), list); /.../ } After many headaches (and crashes) due to mistaken format specification fields, I thought to upgrade my class's API to use boost::format, but alas, I couldn't find the way to feed the format object from a va_list. Is there a way? thanks in advance... Dan.

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[newbie] building serialization library
by Muruganathan Annamalai 22 Dec '04

22 Dec '04

hi, Is it possible to build the boost serialization library using VC6 compiler. --annamalai -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org]On Behalf Of Frank Brown Sent: Thursday, December 16, 2004 6:37 AM To: boost-users(a)lists.boost.org Subject: [Boost-users] newbie build question sorry if this has been asked before, it's very elementary but i can't find references in the archives or faq so here goes: i just installed boost libraries and built them via bjam. they seemed to build successfully. i'm using the vc7.1 compiler. when i try to compile (cl) a .cpp file containing the following include #include <boost/regex.hpp> i get the following: testBoost.cpp(8) : fatal error C1083: Cannot open include file: 'boost/regex.hpp': No such file or directory if i replace the include with the actual file spec like this: #include "C:\Boost\include\boost-1_32\boost\regex.hpp" i get the following compiler error: testboost.cpp C:\Boost\include\boost-1_32\boost\regex.hpp(28) : fatal error C1083: Cannot open include file: 'boost/regex/config.hpp': No such file or directory apparently the compiler (cl) isn't translating <boost>. since one boost header refers to others i need to fix this basic problem. i tried substituting the bjam.exe in place of cl to compile, then i get a different error: Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from D:\c\whereis up to the root so i'm sorry to bother y'all with such a simple problem, all i need to know is how to compile (the 'hello world' scenario). thanks for your attention. -frank brown (stupid jerk) http://www.inwa.net/~frog _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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boost::serialize on Codewarrior 8.3 (Mac)
by Ryan Wilcox 22 Dec '04

22 Dec '04

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello all, I would like to use boost::serialize for one of my projects, using Codewarrior 8.3 (going to CW 9 may or may not be in the picture), on Mac OS X (10.3.x) Anyway, I've been working on getting the unit tests for boost::serialize up and running inside the Codewarrior IDE. I created a new project file (C++, Mac OS Carbon, Console), included a serialize unit test, set the paths correctly, included the files I thought I would need for boost::test stuff, all that jazz. The test that I'm trying out now, in the serialization test suite, is test_binary.cpp. Trying to compile it gave me some immediate compiler errors (which I fixed by #including some additional source files: "binary_archive.hpp", "stdio.h" (tmpnam is in stdio.h in CW, and not cstdio). At the end I have just one error which I don't understand (both because the error message is hard to parse, and I'm fairly new to the boost libraries in general). Here, for completeness, is the error message: Error : illegal use of abstract class ('boost::archive::detail::basic_iserializer::load_object_data(boost::archive::detail::basic_iarchive &, void *, const unsigned int) const') ~ (point of instantiation: 'test_main(int, char **)') ~ (instantiating: 'boost::archive::detail::interface_iarchive<boost::archive::binary_iarchive>::operator>><boost::serialization::nvp<A>>(const boost::serialization::nvp<A> &)') ~ (instantiating: 'boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive>::load_override<boost::serialization::nvp<A>>(boost::serialization::nvp<A> &, int)') ~ (instantiating: 'boost::archive::basic_binary_iarchive<boost::archive::binary_iarchive>::load_override<boost::serialization::nvp<A>>(boost::serialization::nvp<A> &, int)') ~ (instantiating: 'boost::archive::load<boost::archive::binary_iarchive, boost::serialization::nvp<A>>(boost::archive::binary_iarchive &, boost::serialization::nvp<A> &)') ~ (instantiating: 'boost::archive::detail::load_non_pointer_type<boost::archive::binary_iarchive, boost::serialization::nvp<A>>::invoke(boost::archive::binary_iarchive &, boost::serialization::nvp<A> &)') ~ (instantiating: 'boost::archive::detail::load_non_pointer_type<boost::archive::binary_iarchive, boost::serialization::nvp<A>>::load_only::invoke(boost::archive::binary_iarchive &, boost::serialization::nvp<A> &)') ~ (instantiating: 'boost::serialization::serialize_adl<boost::archive::binary_iarchive, boost::serialization::nvp<A>>(boost::archive::binary_iarchive &, boost::serialization::nvp<A> &, const unsigned int)') ~ (instantiating: 'boost::serialization::serialize<boost::archive::binary_iarchive, boost::serialization::nvp<A>>(boost::archive::binary_iarchive &, boost::serialization::nvp<A> &, const unsigned int)') ~ (instantiating: 'boost::serialization::access::serialize<boost::archive::binary_iarchive, boost::serialization::nvp<A>>(boost::archive::binary_iarchive &, boost::serialization::nvp<A> &, const unsigned int)') ~ (instantiating: 'boost::serialization::nvp<A>::serialize<boost::archive::binary_iarchive>(boost::archive::binary_iarchive &, const unsigned int) const') ~ (instantiating: 'boost::archive::detail::interface_iarchive<boost::archive::binary_iarchive>::operator&<A>(A &)') ~ (instantiating: 'boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive>::load_override<A>(A &, int)') ~ (instantiating: 'boost::archive::basic_binary_iarchive<boost::archive::binary_iarchive>::load_override<A>(A &, int)') ~ (instantiating: 'boost::archive::load<boost::archive::binary_iarchive, A>(boost::archive::binary_iarchive &, A &)') ~ (instantiating: 'boost::archive::detail::load_non_pointer_type<boost::archive::binary_iarchive, A>::invoke(boost::archive::binary_iarchive &, A &)') ~ (instantiating: 'boost::archive::detail::load_non_pointer_type<boost::archive::binary_iarchive, A>::load::invoke(boost::archive::binary_iarchive &, A &)') ~ (instantiating: 'boost::archive::detail::iserializer<boost::archive::binary_iarchive, A>::instantiate()') iserializer.hpp line 142 static iserializer instance; _____ I don't, really, understand why there's an error here, as iserializer is ~ a non-abstract type (as far as I can see), but it looks like there's plenty of template stuff going on, and there may be a clue in there. Does anyone have any pointers, or ideas on how I can fix this error? Thanks, _Ryan Wilcox ================================================================ Wilcox Development Solutions: http://www.wilcoxd.com Toolsmiths for the Internet Age PGP: 0x2F4E9C31 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (Darwin) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFBx1BUbYO0qC9OnDERAtAcAJ4nR0Zff4hFRNQJzyVybmIO1DF7IwCff2LK 1KAnmA4JtS6AOvLgrJxVkF4= =/7gM -----END PGP SIGNATURE-----

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program_options custom type problem
by Jacques Kerner 22 Dec '04

22 Dec '04

Hi, I am trying to use a custom type with the program_options library, but I get the "invalid option value" error when running my application, although inline parameters are correctly read. Here is what I do : I define a class ApplicationLocator consisting of two integer members, "site" and "application" and the corresponding >> and << operator towards and from stringstream. The following method in lexical_cast.hpp returns false : bool operator>>(InputStreamable &output) { return !is_pointer<InputStreamable>::value && stream >> output && (stream >> std::ws).eof(); } which results in an exception being thrown eventually, by this code (also in lexical_cast.hpp) : template<typename Target, typename Source> Target lexical_cast(Source arg) { detail::lexical_stream<Target, Source> interpreter; Target result; if(!(interpreter << arg && interpreter >> result)) throw_exception(bad_lexical_cast(typeid(Target), typeid(Source))); return result; } The problem is that my >> operator returns true alright. Maybe I am wrong, but apparently what returns false is (stream >> std::ws).eof(); which I do not quite understand, let alone know how to avoid. Could someone kindly give me guidance on this ? Here is my custom type related code : #include <strstream> #include <boost/algorithm/string/split.hpp> #include <boost/lambda/lambda.hpp> class ApplicationLocator { public: ApplicationLocator() : site(0), application(0) {} ApplicationLocator(const int & aSite, const int & anApplication) : site(aSite), application(anApplication) {} int site; int application; }; bool operator>>(const std::stringstream & input, ApplicationLocator &output) { std::vector<std::string> splitString; boost::algorithm::split( splitString, std::string(input.str()), boost::lambda::_1=='.' ); if (splitString.size() > 1) { output.site = atoi(splitString[0].c_str()); output.application = atoi(splitString[1].c_str()); return true; } else { return true; } return true; } std::stringstream & operator<<(std::stringstream & output, const ApplicationLocator & input) { output << input.site << "." << input.application << '\0'; return output; } and the program_options related code : boost::program_options::positional_options_description positional; boost::program_options::variables_map configurationVariablesMap; try { boost::program_options::options_description desc("Allowed options"); desc.add_options() ("help,h", "produce help message") ("self-id,s", boost::program_options::value<ApplicationLocator>()->default_value(ApplicationLocator(1,1)), "This application's DIS identifier : site.application (separated by a dot)") ("instructor-id,i", boost::program_options::value<ApplicationLocator>()->default_value(ApplicationLocator(2,1)), "This instructor's DIS identifier : site.application (separated by a dot)") ; boost::program_options::store(boost::program_options::command_line_parser(argc, argv).options(desc).run(), configurationVariablesMap); boost::program_options::notify(configurationVariablesMap); if (configurationVariablesMap.count("help")) { std::cout << "Usage: options_description [options]\n"; std::cout << desc; return 0; } } catch(exception& e) { std::cout << e.what() << std::endl; return 1; } Thank you all in advance. Jacques Kerner

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filtered graph
by Matthias Linkenheil 22 Dec '04

22 Dec '04

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multi_index : performance issue
by Stanislas RENAN 22 Dec '04

22 Dec '04

Hi, I've got a performance problem during a test I've done with multi_index on MSVC 6.0 SP 6. I'm using BOOST 1.32.0 . The search performance is comparable with several maps, but insertion is dramatically slow : 5mn 30s for 10 000 employees. Here is my test code : === /* Boost.MultiIndex basic example. * * Copyright 2003-2004 Joaquín M López Muñoz. * Distributed under the Boost Software License, Version 1.0. * (See accompanying file LICENSE_1_0.txt or copy at * http://www.boost.org/LICENSE_1_0.txt) * * See http://www.boost.org/libs/multi_index for library home page. */ #include "stdafx.h" #if !defined(NDEBUG) #define BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING #define BOOST_MULTI_INDEX_ENABLE_SAFE_MODE #endif #include <boost/multi_index_container.hpp> #include <boost/multi_index/member.hpp> #include <boost/multi_index/ordered_index.hpp> #include <algorithm> #include <iostream> #include <iterator> #include <string> #include <cstdlib> #include <map> #include <vector> #include <ctime> #include <sstream> #include <iomanip> using boost::multi_index_container; using namespace boost::multi_index; /* an employee record holds its ID, name and age */ struct employee { int m_id; std::string m_name; int m_age; employee(int id_,const std::string& name_,int age_):m_id(id_),m_name(name_),m_age(age_){} void set(int id_,const std::string& name_,int age_) { m_id=id_; m_name=name_; m_age=age_; } const employee& operator =(const employee& e) { set(e.m_id, e.m_name, e.m_age); return *this; } employee(const employee& e) { set(e.m_id, e.m_name, e.m_age); } int id() const { return m_id; } // impossible d'appeler la fonction et l'index "id" const std::string& name() const { return m_name; } int age() const { return m_age; } friend std::ostream& operator<<(std::ostream& os,const employee& e) { os<<e.m_id<<" "<<e.m_name<<" "<<e.m_age<<std::endl; return os; } }; /* tags for accessing the corresponding indices of employee_set */ struct id{}; struct name{}; struct age{}; /* see Advanced topics: Use of member_offset for info on * BOOST_MULTI_INDEX_MEMBER */ /* Define a multi_index_container of employees with following indices: * - a unique index sorted by employee::int, * - a non-unique index sorted by employee::name, * - a non-unique index sorted by employee::age. */ typedef multi_index_container< employee, indexed_by< ordered_unique< tag<id>, BOOST_MULTI_INDEX_MEMBER(employee,int,m_id)>, ordered_non_unique< tag<name>,BOOST_MULTI_INDEX_MEMBER(employee,std::string,m_name)>, ordered_non_unique< tag<age>, BOOST_MULTI_INDEX_MEMBER(employee,int,m_age)> > > employee_set; template<typename Tag,typename MultiIndexContainer> void print_out_by( const MultiIndexContainer& s, Tag* =0 /* fixes a MSVC++ 6.0 bug with implicit template function parms */ ) { /* obtain a reference to the index tagged by Tag */ const typename boost::multi_index::index<MultiIndexContainer,Tag>::type& i= get<Tag>(s); typedef typename MultiIndexContainer::value_type value_type; /* dump the elements of the index to cout */ std::copy(i.begin(),i.end(),std::ostream_iterator<value_type>(std::cout)); } // Un conteneur qui permet de contenir des employee // triés sur 3 index. class EmployeeMapper { std::map<int, employee *> m_byId; std::map<std::string, employee *> m_byName; std::map<int, employee *> m_byAge; typedef std::map<int, employee *>::iterator EMIdIt; typedef std::map<std::string, employee *>::iterator EMNameIt; typedef std::map<int, employee *>::iterator EMAgeIt; public: EmployeeMapper() {} ~EmployeeMapper() { // Deux lignes pour éviter que ces objets ne contiennent // des pointeurs invalides pendant la destruction va un // autre conteneur. m_byName.clear(); m_byAge.clear(); std::map<int, employee *>::iterator it; while ((it=m_byId.begin()) != m_byId.end()) { delete it->second; m_byId.erase(it); } } void add(const employee& e) { employee * e2 = NULL; try { e2 = new employee(e); } catch(...) { delete e2; throw; } m_byId[e2->id()] = e2; m_byName[e2->name()] = e2; m_byAge[e2->age()] = e2; } employee* byId(int id) { EMIdIt it = m_byId.find(id); if (it == m_byId.end()) return NULL; else return it->second; } employee* byName(const std::string& name) { EMNameIt it = m_byName.find(name); if (it == m_byName.end()) return NULL; else return it->second; } employee* byAge(int age) { EMAgeIt it = m_byAge.find(age); if (it == m_byAge.end()) return NULL; else return it->second; } private: // fonctions inhibées EmployeeMapper(const EmployeeMapper&); const EmployeeMapper& operator=(const EmployeeMapper&); }; // Retourne un entier tq : 0 <= entier < maximum int alea(int maximum) { return int(std::min(maximum, RAND_MAX) * rand() / (RAND_MAX + 1.0)); } int main() { // Init aléatoire srand( (unsigned)time( NULL ) ); employee_set es; EmployeeMapper em; const int tailleEnsemble = 10000; const int tailleEchantillon = 10; const int moduloEchantillon = tailleEnsemble / tailleEchantillon; const int nbRecherches = 10000; std::vector<std::string> noms; noms.push_back("Alphonse"); noms.push_back("Éléonore"); noms.push_back("Gaston"); noms.push_back("Séverine"); noms.push_back("Zorglub"); std::vector<employee> jeuDeDepart; std::vector<employee> jeuARechercher; int i=0; for (i=0; i < tailleEnsemble; ++i) { std::ostringstream os; // Construction d'un nom unique avec un caractère aléatoire // Cela reflète le type de données gérées en réalité. // L'ajout de i implique l'unicité. os << noms[alea(5)] << std::setw(5) << std::setfill('0') << alea(30000) << std::setw(5) << std::setfill('0') << i; employee e(i, // index numérique unique os.str(), // nom, chaîne unique alea(100)); // valeur potentiellement dupliquée jeuDeDepart.push_back(e); // On conserve un échantillon à rechercher plus tard if (0 == i % moduloEchantillon) { //employee_set::iterator it=get<id>(es).find(i); //if (it != es.end()) jeuARechercher.push_back(jeuDeDepart[i]); } } clock_t tes1, tes2; tes1 = clock(); for (i=0; i < tailleEnsemble; ++i) { es.insert(jeuDeDepart[i]); } tes2 = clock(); clock_t tem1, tem2; tem1 = clock(); for (i=0; i < tailleEnsemble; ++i) { em.add(jeuDeDepart[i]); } tem2 = clock(); clock_t t1_1, t2_1; t1_1 = clock(); // Accède à un certain nombre d'éléments précis selon // plusieurs index for (i=0; i < nbRecherches; ++i) { for (std::vector<employee>::iterator it = jeuARechercher.begin(); it != jeuARechercher.end(); ++it) { // Les fonctions membres template qui permette de trouver les // index par tag ne fonctionnent pas avec MSVC 6 employee_set::iterator eit = get<id>(es).find(it->id()); nth_index_iterator<employee_set,1>::type eit2 = get<1>(es).find(it->name()); nth_index_iterator<employee_set,2>::type eit3 = get<2>(es).find(it->age()); } } t2_1 = clock(); clock_t t1_2, t2_2; t1_2 = clock(); // Deuxième méthode : avec des maps et des news. for (i=0; i < nbRecherches; ++i) { for (std::vector<employee>::iterator it = jeuARechercher.begin(); it != jeuARechercher.end(); ++it) { em.byId(it->id()); em.byName(it->name()); em.byAge(it->age()); } } t2_2 = clock(); double d1, d2; d1 = t1_2 - t1_1; d2 = t2_2 - t2_1; std::cout << "Insertion" << std::endl; std::cout << "multi = " << (tes2-tes1) << std::endl << "STL = " << (tem2-tem1) << std::endl; std::cout << "Recherche" << std::endl; std::cout << "multi = " << d1 << std::endl << "STL = " << d2 << std::endl; return 0; } === Here are the results displayed : === Insertion multi = 329125 STL = 156 Recherche multi = 735 STL = 625 === Am I doing something wrong ? Note that I do not instanciate anything explicitely during insertion loop. Regards -- Stanislas RENAN

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