April 2008 - Boost-users - lists.boost.org

Mingw cross compilation
by James Choa 21 Apr '08

21 Apr '08

Hello everyone, Is there anyway for me to create a cross compilation version of the boost libraries? I have already compiled the linux version of the boost libraries and now I would like to compile a windows version of it. I'm using Fedora 8 with i386-mingw32 as my cross compiler (gcc 4.2.1). Any help would be greatly appreciated :) --James Choa

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Re: [Boost-users] [multi_index] how to check if an iterator ist still valid
by joaquin＠tid.es 21 Apr '08

21 Apr '08

Kowalke Oliver (QD IT PA AS) escribió: > Hi, > how can I ensure that an iterator is still valid (item was not > removed from the index)? > Well, there is no legal way to determine whether an iterator is valid or not unless you already have this information from other sources (the state your program is in or other contextual info). The reason is that if you've got an invalid iterator you cannot do anything with it except assign it a new valid value: iterator it=cont.find(...); cont.erase(it); // "it" is now invalid *it; // ILLEGAL ++it; --it; // ILLEGAL it2=it; // ILLEGAL foo(it); // ILLEGAL, provided foo accepts "it" by value it=cont.find(...); // OK [That said, you can grossly abuse the functionality provided by Boost.MultiIndex's safe mode (http://www.boost.org/doc/libs/1_35_0/libs/multi_index/doc/tutorial/debug.ht… ) to check whether an iterator is valid, but this is totally non-recommendable as safe mode is a debugging aid and not program-level functionality, you really oughtn’t do it.] Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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Facing problem while running sample code for filesystem
by Ashish Agrawal 21 Apr '08

21 Apr '08

Hi Users, I am very new user of Boost libraries. I am facing a problem while I am running a sample code of filesystem. My system is MAC OS X 10.4.11. I am executing following command for the attached .cpp file: c++ -I/usr/local/include/boost-1_35 test.cpp -o test \ /usr/local/lib/libboost_filesystem-mt-1_35.dylib I am getting following errors: /usr/bin/ld: warning can't open dynamic library: libboost_system-mt-1_35.dylib referenced from: /usr/local/lib/libboost_filesystem-mt-1_35.dylib (checking for undefined symbols may be affected) (No such file or directory, errno = 2) /usr/bin/ld: Undefined symbols: boost::system::get_posix_category() boost::system::get_system_category() boost::system::get_posix_category() referenced from libboost expected to be defined in libboost_system-mt-1_35.dylib boost::system::get_system_category() referenced from libboost expected to be defined in libboost_system-mt-1_35.dylib collect2: ld returned 1 exit status Thanks a lot in advance. -- Ashish Kumar Agrawal +41-76-358-5982

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boost::serialization - duplicate symbol from portable_binary_*archive
by j.c. 21 Apr '08

21 Apr '08

If you include the file "portable_binary_iarchive.hpp" or "portable_binary_oarchive.hpp" in a common header the result is: ld: duplicate symbol boost ::archive ::detail ::archive_pointer_iserializer < portable_binary_iarchive >::find(boost::serialization::extended_type_info const&)in /Users/jo/ Documents/packet_serialization_test/build/ orchid_packet_serialization.build/Debug/ packet_serialization_test.build/Objects-normal/i386/packet_base.o and / Users/jo/Documents/packet_serialization_test/build/ orchid_packet_serialization.build/Debug/ packet_serialization_test.build/Objects-normal/i386/main.o

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[multi_index] how to check if an iterator ist still valid
by Kowalke Oliver (QD IT PA AS) 21 Apr '08

21 Apr '08

Hi, how can I ensure that an iterator is still valid (item was not removed from the index)? regards,Oliver

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Egg Review ends today
by dan marsden 20 Apr '08

20 Apr '08

The review of the Egg library by Shunsuke Sogame ends today. If anybody is still considering doing a review, please do still submit it, even if it is a few days late. It will take a short while for me to summarise the discussion during the review period. The review result will be posted shortly. Thanks Dan Marsden Review Manager __________________________________________________________ Sent from Yahoo! Mail. A Smarter Email http://uk.docs.yahoo.com/nowyoucan.html

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release 1_34 for borland
by Totte Karlsson 20 Apr '08

20 Apr '08

Hi I want to use boost threads classes with borland and I found that the latest release don't support borland compiler. How or where can I download a windows installer for boost release 1_34 ? thanks -totte

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Re: [Boost-users] [multi_index] custom template class for handle multi_index map
by damny＠web.de 20 Apr '08

20 Apr '08

hi joaquin, a) here's a ready to use code snippet (see below). i isolating the problem by writing the snippet to the reuse of objects or using local temporary objects; i thought multi_index maps store copies of data objects, that where inserted. am i wrong? b) why it isn't possible to write (with "?" is a class attribute or template parameter; see snippet): template<typename MAP, typename ELM, typename SC1, typename IT1, typename SC2, typename IT2> const ELM *tCanMap<MAP,ELM,SC1,IT1,SC2,IT2>::getmapelm(STRING stNme) const { IT1 itr = this->_mpMap.get<?>().find(stNme); if ( itr != this->_mpMap.get<?>().end() ) { return &(*itr); } } thank you daniel //--- BEG ---------------------------------------------------------------------- #if defined(_Windows) || defined(_MSC_VER) || defined (__GNUC__) #define STRICT #include <windows.h> #endif #include <string> #define BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING #define BOOST_MULTI_INDEX_ENABLE_SAFE_MODE #include <boost/multi_index_container.hpp> #include <boost/multi_index/member.hpp> #include <boost/multi_index/mem_fun.hpp> #include <boost/multi_index/ordered_index.hpp> #include <boost/multi_index/hashed_index.hpp> //------------------------------------------------------------------------------ #define UINT32 unsigned long #define STRING std::string //------------------------------------------------------------------------------ // choose one //#define VERSION01 //#define VERSION02 //#define VERSION03 //#define VERSION04 //------------------------------------------------------------------------------ template<typename MAP, typename ELM, typename SC1, typename IT1, typename SC2, typename IT2> class tCanMap { protected: mutable MAP _mpMap; // map mutable SC1 *_scNme; // sorting criteria name ... have to init from derived class mutable SC2 *_scDat; // sorting criteria name ... have to init from derived class public: tCanMap (); MAP &getmap () const; UINT32 setmapelm (ELM val); #if defined (VERSION01) || defined (VERSION02) const ELM *getmapelm (STRING stNme) const; const ELM *getmapelm (UINT32 uiDat) const; #endif }; template<typename MAP, typename ELM, typename SC1, typename IT1, typename SC2, typename IT2> tCanMap<MAP,ELM,SC1,IT1,SC2,IT2>::tCanMap() { this->_scNme = NULL; this->_scDat = NULL; } template<typename MAP, typename ELM, typename SC1, typename IT1, typename SC2, typename IT2> MAP &tCanMap<MAP,ELM,SC1,IT1,SC2,IT2>::getmap() const { return this->_mpMap; } template<typename MAP, typename ELM, typename SC1, typename IT1, typename SC2, typename IT2> UINT32 tCanMap<MAP,ELM,SC1,IT1,SC2,IT2>::setmapelm(ELM val) { if (this!=NULL) { this->_mpMap.insert(val); return 0; } return 1; } #if defined (VERSION01) || defined (VERSION02) template<typename MAP, typename ELM, typename SC1, typename IT1, typename SC2, typename IT2> const ELM *tCanMap<MAP,ELM,SC1,IT1,SC2,IT2>::getmapelm(STRING stNme) const { try { if ( this!=NULL && this->_scNme!=NULL ) { IT1 itr = this->_scNme->find(stNme); if ( itr != this->_scNme->end() ) { return &(*itr); } } } catch(...) {} return NULL; } template<typename MAP, typename ELM, typename SC1, typename IT1, typename SC2, typename IT2> const ELM *tCanMap<MAP,ELM,SC1,IT1,SC2,IT2>::getmapelm(UINT32 uiDat) const { try { if ( this!=NULL && this->_scDat!=NULL ) { IT2 itr = this->_scDat->find(uiDat); if ( itr != this->_scDat->end() ) { return &(*itr); } } } catch(...) {} return NULL; } #endif //------------------------------------------------------------------------------ class cClass00 { private: STRING _nme; UINT32 _dat; public: cClass00() {} cClass00(STRING nme, UINT32 dat) { this->_nme=nme; this->_dat=dat; } STRING getnme () const { return this->_nme; } UINT32 getdat () const { return this->_dat; } }; typedef boost::multi_index_container < cClass00, boost::multi_index::indexed_by < boost::multi_index::hashed_unique < BOOST_MULTI_INDEX_CONST_MEM_FUN(cClass00,STRING,getnme) >, boost::multi_index::ordered_unique < BOOST_MULTI_INDEX_CONST_MEM_FUN(cClass00,UINT32,getdat) > > > mClass00; typedef mClass00::nth_index<0>::type mClass00ByNme; typedef mClass00ByNme::iterator mClass00ByNmeItr; typedef mClass00::nth_index<1>::type mClass00ByDat; typedef mClass00ByDat::iterator mClass00ByDatItr; //------------------------------------------------------------------------------ class cClass01 : public tCanMap<mClass00,cClass00,mClass00ByNme,mClass00ByNmeItr,mClass00ByDat,mClass00ByDatItr> { private: STRING _nme; UINT32 _dat; public: cClass01() {} cClass01(STRING nme, UINT32 dat) { this->_nme=nme; this->_dat=dat; this->_scNme = &(this->_mpMap.get<0>()); this->_scDat = &(this->_mpMap.get<1>()); } STRING getnme() const { return this->_nme; } UINT32 getdat() const { return this->_dat; } #if defined (VERSION03) || defined (VERSION04) const cClass00 *getmapelm (STRING stNme) const { try { if ( this!=NULL ) { mClass00ByNmeItr itr = this->_mpMap.get<0>().find(stNme); if ( itr != this->_mpMap.get<0>().end() ) { return &(*itr); } } } catch(...) {} return NULL; } const cClass00 *getmapelm (UINT32 uiDat) const { try { if ( this!=NULL ) { mClass00ByDatItr itr = this->_mpMap.get<1>().find(uiDat); if ( itr != this->_mpMap.get<1>().end() ) { return &(*itr); } } } catch(...) {} return NULL; } #endif }; typedef boost::multi_index_container < cClass01, boost::multi_index::indexed_by < boost::multi_index::hashed_unique < BOOST_MULTI_INDEX_CONST_MEM_FUN(cClass01,STRING,getnme) >, boost::multi_index::ordered_unique < BOOST_MULTI_INDEX_CONST_MEM_FUN(cClass01,UINT32,getdat) > > > mClass01; typedef mClass01::nth_index<0>::type mClass01ByNme; typedef mClass01ByNme::iterator mClass01ByNmeItr; typedef mClass01::nth_index<1>::type mClass01ByDat; typedef mClass01ByDat::iterator mClass01ByDatItr; //------------------------------------------------------------------------------ class cClass02 : public tCanMap<mClass01,cClass01,mClass01ByNme,mClass01ByNmeItr,mClass01ByDat,mClass01ByDatItr> { public: cClass02() { this->_scNme = &(this->_mpMap.get<0>()); this->_scDat = &(this->_mpMap.get<1>()); } #if defined (VERSION03) || defined (VERSION04) const cClass01 *getmapelm (STRING stNme) const { try { if ( this!=NULL ) { mClass01ByNmeItr itr = this->_mpMap.get<0>().find(stNme); if ( itr != this->_mpMap.get<0>().end() ) { return &(*itr); } } } catch(...) {} return NULL; } const cClass01 *getmapelm (UINT32 uiDat) const { try { if ( this!=NULL ) { mClass01ByDatItr itr = this->_mpMap.get<1>().find(uiDat); if ( itr != this->_mpMap.get<1>().end() ) { return &(*itr); } } } catch(...) {} return NULL; } #endif }; //------------------------------------------------------------------------------ int main(void) { #if defined (VERSION01) || defined (VERSION03) // works fine in any case cClass00 objClass00_01 = cClass00( "elm00_01", 1 ); cClass00 objClass00_02 = cClass00( "elm00_02", 2 ); cClass00 objClass00_03 = cClass00( "elm00_03", 3 ); cClass00 objClass00_04 = cClass00( "elm00_04", 4 ); cClass01 objClass01_01 = cClass01( "elm01_01", 11 ); cClass01 objClass01_02 = cClass01( "elm01_02", 12 ); objClass01_01.setmapelm( objClass00_01 ); objClass01_01.setmapelm( objClass00_02 ); objClass01_02.setmapelm( objClass00_03 ); objClass01_02.setmapelm( objClass00_04 ); cClass02 *ptrClass02_01 = new cClass02(); ptrClass02_01->setmapelm( objClass01_01 ); ptrClass02_01->setmapelm( objClass01_02 ); printf("START\n"); printf("\n"); printf( "1. try: %02d\n", ptrClass02_01->getmapelm("elm01_01")->getdat() ); printf( "2. try: %02d\n", ptrClass02_01->getmapelm("elm01_02")->getdat() ); printf("\n"); printf( "3. try: %02d\n", ptrClass02_01->getmapelm("elm01_01")->getmapelm("elm00_01")->getdat() ); printf( "4. try: %02d\n", ptrClass02_01->getmapelm("elm01_02")->getmapelm("elm00_04")->getdat() ); printf("\n"); printf( "5. try: %s\n", ptrClass02_01->getmapelm("elm01_01")->getmapelm(2)->getnme().c_str() ); printf( "6. try: %s\n", ptrClass02_01->getmapelm("elm01_02")->getmapelm(3)->getnme().c_str() ); printf("\n"); printf("DONE\n"); #elif defined (VERSION02) || defined (VERSION04) // run into segvault if object become overwritten OR // object for filling multi_index is only a local variable of a filling function cClass02 *ptrClass02 = new cClass02(); cClass01 objClass01; cClass00 objClass00; objClass01 = cClass01("elm01_01", 11); objClass00 = cClass00("elm00_01", 1); objClass01.setmapelm(objClass00); objClass00 = cClass00("elm00_02", 2); objClass01.setmapelm(objClass00); objClass01 = cClass01("elm01_02", 12); objClass00 = cClass00("elm00_03", 4); objClass01.setmapelm(objClass00); objClass00 = cClass00("elm00_04", 3); objClass01.setmapelm(objClass00); ptrClass02->setmapelm(objClass01); printf("START\n"); printf( "dat = %d\n", ptrClass02->getmapelm("elm01_01")->getdat() ); // seg_vault // printf( "dat = %d\n", ptrClass02->getmapelm("elm01_02")->getdat() ); // works fine printf("DONE\n"); #endif } //--- END ---------------------------------------------------------------------- ______________________________________________________ Bis 50 MB Dateianhänge? Kein Problem! http://freemail.web.de/club/landingpage.htm/?mc=025556

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[thread] more problems with condition
by Anteru 20 Apr '08

20 Apr '08

Hi, I've posted this to the users list as well, but it might have got lost as I replied on the original thread. Well, I still have problems with the conditions, even with the latest SVN. The problem seems to be that inside a block like: Lock lock (mutex); while (something.empty ()) cond.wait (mutex); I'm still getting into a state where something.empty () == false and yet I'm waiting on the condition. The only other access happens via: Lock lock (mutex); something.push (...); cond.notify_one (); So I don't get it how something can go wrong, unless the transition from mutex.unlock () to cond.wait () is not fully atomic and the following happens: Thread 1: while (something.empty ()) cond.wait (mutex); // starts, releaes lock but is not waiting yet Now comes Thread 2: Lock lock (); something.push cond.notify_one (); // Nobody waiting lock.release (); Thread 1 again: cond.wait (mutex); // starts waiting I had a similar problem with my own condition implementation on Windows, with exactly the same syndromes (I've been following the "Strategies for Implementing POSIX Condition Variables on Win32" http://www.cs.wustl.edu/~schmidt/win32-cv-1.html - only got it working properly with SignalObjectAndWait). Currently, it always leaves exactly *one* thread waiting, while previously, it left several threads waiting, so it has improved but there is still a problem. Any ideas? Anything I can do to track this down further? Cheers, Anteru

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[statechart] Using fast_pool_allocator along with state_machine
by Babi Seal 19 Apr '08

19 Apr '08

Hi, I would like to avoid fragmentation and perhaps reduce the time spent entering and leaving state in my state machine by leveraging the fast_pool_allocator. My very limited understanding of allocators comes from Scott Meyer's Effective STL and his references to articles on the Web. From reading the implementation of state_machine, I am not clear what the template-arguments for the UserAllocator should be if I wish to use the fast_pool_allocator as the UserAllocator parameter for state-machine. If I specified boost::fast_pool_allocator<int> does the library take care of somehow doing a rebind and allocating the right amount of memory for the states ? >From reading the changeset documentation (Point 2, Breaking Change of 14 August 2005) I see that " this considerably simplifies memory management customization. A user now only needs to pass his own allocator to state_machine<> and no longer has to separately overload operator new/delete for his state classes" Any guidance would be really appreciated ? Thanks #ifndef __STATE_H_INCL__ #define __STATE_H_INCL__ #include <boost/statechart/state_machine.hpp> #include <boost/statechart/state.hpp> #include <boost/statechart/transition.hpp> #include <boost/pool/pool_alloc.hpp> namespace sc = boost::statechart; // We need to forward-declare the initial state because it can // only be defined at a point where the state machine is // defined. struct Enabled; struct Machine : sc::state_machine< Machine, Enabled, boost::fast_pool_allocator< int > > /* ??? is this right ? */ { Machine(); ~Machine() { terminate(); } int ContextAssociatedwithStateMachine; }; #endif ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

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