January 2008 - Boost-users - lists.preview.boost.org

[Boost.Iostreams] Question about gzip codec and dual_use filter
by Marc Viala Perso 22 Jan '08

22 Jan '08

Hello, I'm just wondering why zlib and bzip2 codec are "dual_use" filter but not gzip? Can anybody enlighten me on this restriction? In fact, I have the following use case: I need to manage an "iostream" instance for interfacing with an external library but I would like to be able to support the GZIP codec during writing/reading operations, that is, I must deal with the following "external" serializer engine: SerializerEngine ar(std::iostream& ios, OpeningMode mode) The SerializerEngine interface provides some read/write raw operations. For doing that, I've just tried to implement the following class: class gzfstream: public boost::iostreams::filtering_stream<boost::iostreams::dual_use> { public: template <class Path> gzfstream(const Path& file_path, std::ios_base::openmode mode): _file(file_path, mode) { if( _file.fail() ) return ; namespace fs = boost::filesystem ; namespace io = boost::iostreams ; const typename Path::string_type& ext = fs::extension(file_path) ; if( gz_extension_exists(ext) ) { const bool in_op = (mode & std::ios::in) != 0 ; const bool out_op = (mode & std::ios::out) != 0 ; if( in_op && out_op ) throw std::logic_error("can't support input/output operation with codec") ; if( out_op ) push(io::gzip_compressor()) ; else push(io::gzip_decompressor()) ; } push(_file) ; } ~gzfstream() { reset() ; } private: boost::filesystem::fstream _file ; bool gz_extension_exists(const std::string& ext) { return ext.size() == 3 && ext == ".gz" ; } bool gz_extension_exists(const std::wstring& ext) { return ext.size() == 3 && ext == L".gz" ; } } ; But this class doesn't compile only for GZIP codec because, as explained in the documentation, GZIP doesn't support dual_use concept - contrary to the ZLib and BZip2 codecs. Is there any issue to deal with my use case? Any help will be appreciate? Best regards, Marc VIALA

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[boost-users] [boost-thread linker error on msvc]
by chun ping wang 22 Jan '08

22 Jan '08

Hi i get the following linker error when compling a program that links to boost-thread. Here is the error... "C:/Program Files/Microsoft Visual Studio 8/VC/bin/lib.exe" -LTCG -out:"./lib/libAlgorithm.lib" ./lib/BitOperation.obj ./lib/ContainerOperation.obj ./lib/DiffieHellman.obj ./lib/dsa.obj ./lib/Elucid.obj ./lib/IsPrime.obj ./lib/mathfunc.obj ./lib/median.obj ./lib/NpComplete.obj ./lib/polynomial.obj ./lib/rsa.obj ./lib/sortingAlgo.obj ./lib/Fourier.obj ./lib/AES.obj Microsoft (R) Library Manager Version 8.00.50727.762 Copyright (C) Microsoft Corporation. All rights reserved. rsa.obj : warning LNK4006: "class boost::random::shuffle_output<class boost::random::linear_congruential<unsigned long,1366,150889,714025,0>,97,139726> Random::generator" (?generator@Random@@3V?$shuffle_output@V ?$linear_congruential@K$0FFG@$0CENGJ@$0KOFCJ@$0A@@random@boost @@$0GB@$0CCBMO@@random@boost@@A) already defined in sortingAlgo.obj; second definition ignored rsa.obj : warning LNK4006: "void __cdecl Random::initialize(void)" (?initialize@Random@@YAXXZ) already defined in sortingAlgo.obj; second definition ignored NpComplete.obj : warning LNK4006: "class boost::random::shuffle_output<class boost::random::linear_congruential<unsigned long,1366,150889,714025,0>,97,139726> Random::generator" (?generator@Random@@3V?$shuffle_output@V ?$linear_congruential@K$0FFG@$0CENGJ@$0KOFCJ@$0A@@random@boost @@$0GB@$0CCBMO@@random@boost@@A) already defined in sortingAlgo.obj; second definition ignored NpComplete.obj : warning LNK4006: "void __cdecl Random::initialize(void)" (?initialize@Random@@YAXXZ) already defined in sortingAlgo.obj; second definition ignored IsPrime.obj : warning LNK4006: "class boost::random::shuffle_output<class boost::random::linear_congruential<unsigned long,1366,150889,714025,0>,97,139726> Random::generator" (?generator@Random@@3V?$shuffle_output@V ?$linear_congruential@K$0FFG@$0CENGJ@$0KOFCJ@$0A@@random@boost @@$0GB@$0CCBMO@@random@boost@@A) already defined in sortingAlgo.obj; second definition ignored IsPrime.obj : warning LNK4006: "void __cdecl Random::initialize(void)" (?initialize@Random@@YAXXZ) already defined in sortingAlgo.obj; second definition ignored dsa.obj : warning LNK4006: "class boost::random::shuffle_output<class boost::random::linear_congruential<unsigned long,1366,150889,714025,0>,97,139726> Random::generator" (?generator@Random@@3V?$shuffle_output@V ?$linear_congruential@K$0FFG@$0CENGJ@$0KOFCJ@$0A@@random@boost @@$0GB@$0CCBMO@@random@boost@@A) already defined in sortingAlgo.obj; second definition ignored dsa.obj : warning LNK4006: "void __cdecl Random::initialize(void)" (?initialize@Random@@YAXXZ) already defined in sortingAlgo.obj; second definition ignored DiffieHellman.obj : warning LNK4006: "class boost::random::shuffle_output<class boost::random::linear_congruential<unsigned long,1366,150889,714025,0>,97,139726> Random::generator" (?generator@Random@@3V?$shuffle_output@V ?$linear_congruential@K$0FFG@$0CENGJ@$0KOFCJ@$0A@@random@boost @@$0GB@$0CCBMO@@random@boost@@A) already defined in sortingAlgo.obj; second definition ignored DiffieHellman.obj : warning LNK4006: "void __cdecl Random::initialize(void)" (?initialize@Random@@YAXXZ) already defined in sortingAlgo.obj; second definition ignored rm -f ./lib/BitOperation.obj ./lib/ContainerOperation.obj ./lib/DiffieHellman.obj ./lib/dsa.obj ./lib/Elucid.obj ./lib/IsPrime.obj ./lib/mathfunc.obj ./lib/median.obj ./lib/NpComplete.obj ./lib/polynomial.obj ./lib/rsa.obj ./lib/sortingAlgo.obj ./lib/Fourier.obj ./lib/AES.obj "C:/Program Files/Microsoft Visual Studio 8/VC/bin/link.exe" -LTCG -out: PolyTestProject.exe ./project/PolyTest.obj -LIBPATH:"C:/Program Files/Microsoft Visual Studio 8/VC/lib" -LIBPATH:"C:/boost_msvc/lib" -LIBPATH:"./lib" libAlgorithm.lib libboost_thread-mt.lib -MACHINE:x86 -nologo -NODEFAULTLIB:msvcrt msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: void __thiscall std::_Mutex::_Lock(void)" (?_Lock@_Mutex@std@@QAEXXZ) already defined in libcpmt.lib(xmutex.obj) msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: void __thiscall std::_Mutex::_Unlock(void)" (?_Unlock@_Mutex@std@@QAEXXZ) already defined in libcpmt.lib(xmutex.obj) msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: class std::basic_ostream<char,struct std::char_traits<char> > & __thiscall std::basic_ostream<char,struct std::char_traits<char> >::flush(void)" (?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@XZ) already defined in PolyTest.obj msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: void __thiscall std::basic_ostream<char,struct std::char_traits<char> >::_Osfx(void)" (?_Osfx@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEXXZ) already defined in PolyTest.obj msvcprt.lib(MSVCP80.dll) : error LNK2005: "bool __cdecl std::uncaught_exception(void)" (?uncaught_exception@std@@YA_NXZ) already defined in libcpmt.lib(uncaught.obj) msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: void __thiscall std::basic_ios<char,struct std::char_traits<char> >::setstate(int,bool)" (?setstate@?$basic_ios@DU?$char_traits@D@std@@@std@@QAEXH_N@Z) already defined in PolyTest.obj msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: int __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::sputn(char const *,int)" (?sputn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEHPBDH@Z) already defined in PolyTest.obj msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: int __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::sputc(char)" (?sputc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEHD@Z) already defined in PolyTest.obj msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in PolyTest.obj PolyTest.obj : error LNK2001: unresolved external symbol "class ?? ::InputIterator __cdecl algocpw::horner( ?? ) throw( ?? )" (?horner@algocpw@@YA?AVInputIterator) PolyTest.obj : error LNK2001: unresolved external symbol "class ?? ::InputIterator __cdecl algocpw::evaluate( ?? ) throw( ?? )" (?evaluate@algocpw@@YA?AVInputIterator) PolyTestProject.exe : fatal error LNK1120: 2 unresolved externals I am suing msvc 2005.

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How to format gregorian::date-output dynamicly
by thom_schu＠gmx.de 22 Jan '08

22 Jan '08

Hi, to be compatible with a given interface I need to encapsulate a boost::gregorian::date. I have a problem with the formatted output of the date-object. I tried a given example: date d(2005,Jun,25); date_facet* facet(new date_facet("%A %B %d, %Y")); std::stringstream ss; ss.imbue(std::locale(std::cout.getloc(), facet)); ss << d; std::cout << ss.str() << std::endl; facet->format("%Y"); ss.str(""); ss << d; std::cout << ss.str() << std::endl; this works fine. But the same inside an object causes an segmentation-fault: class MyDate { date m_date; std::stringstream ss; date_facet* facet; Date() : m_date(day_clock::local_day()), facet(new date_facet("%A %B %d, %Y")) { ss.imbue(std::locale(std::cout.getloc(), facet)); } std::string Date::format(std::string pattern) { facet->format(pattern.c_str()); ss.str(""); ss << m_date; return ss.str(); } } Can anybody tell me what Im doing wrong and how to do it better ? Thanks a lot gizmo -- Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten Browser-Versionen downloaden: http://www.gmx.net/de/go/browser -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer

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(no subject)
by thom_schu＠gmx.de 22 Jan '08

22 Jan '08

Hi, to be compatible with a given interface I need to encapsulate a boost::gregorian::date. I have a problem with the formatted output of the date-object. I tried a given example: date d(2005,Jun,25); date_facet* facet(new date_facet("%A %B %d, %Y")); std::stringstream ss; ss.imbue(std::locale(std::cout.getloc(), facet)); ss << d; std::cout << ss.str() << std::endl; facet->format("%Y"); ss.str(""); ss << d; std::cout << ss.str() << std::endl; this works fine. But the same inside an object causes an segmentation-fault: class MyDate { date m_date; std::stringstream ss; date_facet* facet; Date() : m_date(day_clock::local_day()), facet(new date_facet("%A %B %d, %Y")) { ss.imbue(std::locale(std::cout.getloc(), facet)); } std::string Date::format(std::string pattern) { facet->format(pattern.c_str()); ss.str(""); ss << m_date; return ss.str(); } } Can anybody tell me what Im doing wrong and how to do it better ? Thanks a lot gizmo -- Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten Browser-Versionen downloaden: http://www.gmx.net/de/go/browser

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[BGL] subgraph serialization
by Etienne Fournier 22 Jan '08

22 Jan '08

Hi, I currently use the adjacency_list class, but I plan to switch to a subgraph. The transition seem to be simple, but I still have a problem. I'd like to know if there's any support for the subgraph serialization? I look over the mailing list archive, but doesn't found any answers. Thanks, Etienne _________________________________________________________________

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[review] Review of Flyweight library begins today January 7
by Ion Gaztañaga 21 Jan '08

21 Jan '08

The formal review of Flyweight library, proposed by Joaquín M. López Muñoz, begins today (sorry for the late announcement): *Description:* Flyweights are small-sized handle classes granting constant access to shared common data, thus allowing for the management of large amounts of entities within reasonable memory limits. Boost.Flyweight makes it easy to use this common programming idiom by providing the class template flyweight<T>, which acts as a drop-in replacement for const T. *Online docs:* http://tinyurl.com/2sstyr http://svn.boost.org/svn/boost/sandbox/flyweight/libs/flyweight/index.html *Download:* http://tinyurl.com/hrdm6 http://www.boost-consulting.com/vault/index.php?&direction=0&order=&directo… *Notes:* 1) We've seen some suggestions in the mailing list for Flyweight. Joaquín has nicely explained a couple of issues that we'd like to address/discuss in the review: http://tinyurl.com/33ghtf http://svn.boost.org/svn/boost/sandbox/flyweight/libs/flyweight/doc/review_… 2) Flyweight needs Boost 1.35 elements because the library depends on libraries like Interprocess for some features/tests. Since SVN snapshot tarballs seem to be missing these days, those who want to try flyweight can download a working SVN-HEAD snapshot here: http://igaztanaga.drivehq.com/boost_trunk.tar.bz2 3) Serialization tests won't work. This feature is expected to work when some new features (discussed in the mailing list between Joaquín and Robert Ramey) are added in Boost.Serialization. Those are expected for Boost 1.36. What to include in Review Comments ================================== Your comments may be brief or lengthy, but basically the Review Manager needs your evaluation of the library. If you identify problems along the way, please note if they are minor, serious, or showstoppers. Here are some questions you might want to answer in your review: * What is your evaluation of the design? * What is your evaluation of the implementation? * What is your evaluation of the documentation? * What is your evaluation of the potential usefulness of the library? * Did you try to use the library? With what compiler? Did you have any problems? * How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? * Are you knowledgeable about the problem domain? And finally, every review should answer this question: * Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Ion Gaztañaga - Review Manager -

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Polymorphic serialization compile error.
by mik 21 Jan '08

21 Jan '08

I'm trying to compile (with VS 2005) a simple example of serialization (boost 1.34) of a polymorphic class, but I get the following compile error: basic_xml_oarchive.hpp(83) : error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' 1> with 1> [ 1> x=false 1> ] Can you help me? I've read the documentation and I didn't understand the difference with the example that I found in there. Here is the source: ----------------------------------------------------------------- //main.cpp #include <iostream> #include <fstream> #include "boost/archive/xml_oarchive.hpp" #include "boost/archive/xml_iarchive.hpp" #include <boost/serialization/base_object.hpp> #include <boost/serialization/is_abstract.hpp> #include <boost/serialization/utility.hpp> class base { public: base(): _a(0) { } base(double a): _a(a) { } virtual double f() = 0; protected: double _a; //Serialitation procedure. friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & boost::serialization::make_nvp("a", _a); } }; BOOST_IS_ABSTRACT(base) class derived: public base { public: derived(): base(0), _b(0) { } derived(double b): base(1), _b(b) { } double f() { return _a + _b; } protected: double _b; //Serialitation procedure. friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & boost::serialization::base_object<base>(*this); ar & boost::serialization::make_nvp("b", _b); } }; int main() { derived dc(5); { std::ofstream ofile("test.xml"); boost::archive::xml_oarchive oa(ofile); oa << boost::serialization::make_nvp("test", dc); } return 0; } -----------------------------------------------------------------

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BOOST_ASSERT with message output?
by Kowalke Oliver (QD IT PA AS) 21 Jan '08

21 Jan '08

Hi, does boost provide a macro like BOOST_ASSERT which allows to print out a message if the assertion is raised? best regards, Oliver

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Memory Leak Detection output format
by Jamie Cook 21 Jan '08

21 Jan '08

Hi all, I'm using the boost.test unit tests with memory leak detection turned on and I'm slightly puzzled about the format of the output. I've been working on getting boost to play nicely with STLport and one of the 'problems' I'm having is with memory leaks being reported by boost.test which are actually coming from stlport (there is a discussion on their FAQ about how these aren't really memory leaks at all but that is beside the point). I've managed to get rid of most of these leaks but I've still got one hanging around and I don't know where it comes from. My output from my testing looks like this Embedding manifest... Performing Post-Build Event... *** No errors detected Running 1 test case... Detected memory leaks! Dumping objects -> {171} normal block at 0x00378B88, 1280 bytes long. Data: < 7 lationStatis> A8 8D 37 00 6C 61 74 69 6F 6E 53 74 61 74 69 73 Object dump complete. My question is this... how can I enable more informative memory leak output? In this article () it says that by #define _CRTDBG_MAP_ALLOC, the filename and line number will also be displayed. I'm looking into execution_monitor.ipp and I can see where <crtdbg.h> is included but even if I put the #define directly before this include the output comes out exactly the same as above. (and yes I recompiled the library) I'm using MSVC8.0, boost 1.34.1 and stlport 5.1.4 and the test library is compiled as C:\Program Files\boost\boost_1_34_1\libs\test\build>bjam --toolset=msvc link=static stdlib=stlport threading=multi I would really appreciate if anyone could give me some insight on why this is being reported in such a way that I can't actually use it. Cheers, -- Jamie Cook Research Engineer ………………………………………..………………… Veitch Lister Consulting Pty Ltd. Ground Floor, 80 Jephson St, PO Box 1054, Toowong, QLD 4066 AUSTRALIA Ph: +61 7 3870 4888 Fax: +61 7 3870 4446 Email: jamie.cook(a)veitchlister.com.au Web: www.veitchlister.com.au ………………………………………..…………………

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Using singleton library
by James Jackson 21 Jan '08

21 Jan '08

Hi, I'd like to give the Singleton library currently out for review a try. I have the standard Boost 1.34.1 release. Blindly copying in the files in the singleton release distribution into the relevant directories in by Boost installation results in compile errors such as: "boost/function_types/is_member_function_pointer.hpp: No such file or directory" And indeed, function_types is not present in my installation. Is there a recipe for getting going with this library on top of the standard distrubtion, or should I just check everything out from HEAD in CVS? Cheers, James.

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