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[Serialization] Compile error in load_wrapper
by Ryan Fowler 02 Mar '09

02 Mar '09

Hi, I am having trouble serializing a class. Actually, I am having trouble compiling the class as below. The actual archiving is behind an interface (hence the Save and Load methods) which may work (once I get this sorted, I'm going to look at the export traits), but the error points to me not declaring the is_wrapper properly. My class: BOOST_CLASS_IS_WRAPPER(Frame); class Frame { ... // Serialize interface uint32 Save( uint8* pStream ) { ostrstream os( (char*)pStream, STREAM_SIZE ); boost::archive::text_oarchive oa(os); oa << this; return os.pcount(); } void Load( uint8* pStream ) { istrstream is( (char*)pStream, STREAM_SIZE ); boost::archive::text_iarchive ia(is); ia >> this; } friend class boost::serialization::access; template< class Archive > void serialize( Archive& ar, const unsigned int version ) { string strObjectType = "IFrame"; ar << strObjectType.length() << strObjectType; ar << m_lMaxFrameLength << m_lDataLength << m_uiTimeStamp; ar << boost::serialization::make_binary_object( (void*)(this + 1), m_lMaxFrameLength ); } My error: W:\NewFramework\Boost\boost/archive/detail/iserializer.hpp(541) : error C2664: 'boost::archive::load_wrapper' : cannot convert parameter 3 from 'boost::serialization::is_wrapper<T>' to 'boost::mpl::true_' 1> with 1> [ 1> T= Frame * 1> ] 1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called 1> W:\NewFramework\Boost\boost/archive/detail/common_iarchive.hpp(59) : see reference to function template instantiation 'void boost::archive::load<Archive,const T>(Archive &,const T &)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] 1> W:\NewFramework\Boost\boost/archive/basic_text_iarchive.hpp(62) : see reference to function template instantiation 'void boost::archive::detail::common_iarchive<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] 1> W:\NewFramework\Boost\boost/archive/text_iarchive.hpp(65) : see reference to function template instantiation 'void boost::archive::basic_text_iarchive<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] 1> W:\NewFramework\Boost\boost/archive/detail/interface_iarchive.hpp(61) : see reference to function template instantiation 'void boost::archive::text_iarchive_impl<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] 1> w:\newframework\framework\sourcecode\includes\RDCFrameFactoryImpl\RDCFra me.h(262) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_iarchive<Archive>::operator >>< Frame*const >(T &)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T= Frame *const 1> ] Thanks, Ryan Ryan Fowler Software Engineer Thomson Reuters Phone: +442075427063 ryan.fowler(a)thomsonreuters.com thomsonreuters.com This email was sent to you by Thomson Reuters, the global news and information company. Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of Thomson Reuters.

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How to use boost::regex source code without using any *.lib file
by Jun Wan 02 Mar '09

02 Mar '09

---------- Forwarded message ---------- From: Jun Wan <junjun.wanjun(a)gmail.com> Date: 2009/2/17 Subject: How to use boost::regex source code without using any *.lib file To: boost-users(a)lists.boost.org Hello, Recently I used boost::regex in my project(VS2005 IDE). It works well with linking the lib file. But I want to use the source code of boost::regex.I include the regex.hpp in the project and used BOOST_REGEX_NO_LIB macro; But I got such error infomation when linking the code. error LNK2001: unresolved external symbol "private: class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > & __thiscall boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::do_assign(char const *,char const *,unsigned int)" (?do_assign@?$basic_regex@DU?$regex_traits@DV ?$w32_regex_traits@D@boost@@@boost@@@boost@@AAEAAV12@PBD0I@Z) error LNK2001: unresolved external symbol "private: void __thiscall boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::construct_init(class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > const &,enum boost::regex_constants::_match_flags)" (?construct_init@?$perl_matcher@PBDV ?$allocator@U?$sub_match@PBD@boost@@@std@@U?$regex_traits@DV ?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost @@AAEXABV?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@ @@boost@@@3@W4_match_flags@regex_constants@3@@Z) error LNK2001: unresolved external symbol "public: bool __thiscall boost::re_detail::perl_matcher<char const *,class std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::find(void)" (?find@?$perl_matcher@PBDV ?$allocator@U?$sub_match@PBD@boost@@@std@@U?$regex_traits@DV ?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost@@QAE_NXZ) I want to know why I can't use the source code of boost::regex. Is there any thing I need to do? Any help will be appreciated! Thank you! Jun

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Fastest way of serializing a huge vector of ints into a human readable string
by Roland Bock 02 Mar '09

02 Mar '09

Hi, I have a program which produces a vector of integers (several million entries). I need to write that into a human-readable string of space separated numbers. I wonder, what would be the fastest way? My first attempt was stringstream resultStream; copy(integers.begin(), integers.end(), ostream_iterator<int>(resultStream, " ")); string result = resultStream.str(); But that requires copying the string. Thus I was wondering if I could use boost to write to the target string directly? boost::iostreams allow me to do the following: string result; boost::iostreams::filtering_ostream out(boost::iostreams::back_inserter(result)); copy(integers.begin(), integers.end(), ostream_iterator<uint64>(out, " ")); This is faster by almost a factor of 2. Any ideas how to increase speed even more? Thanks in advance, Roland

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[pool] Request at least 65535 bytes from UserAllocator.
by Alexander 01 Mar '09

01 Mar '09

Hi I'm going to use Boost.Pool with UserAllocator mapped directly to Windows API calls ::VirtualAlloc and ::VirtualFree. So it makes no sense to allocate less than SYSTEM_INFO::dwAllocationGranularity, which currently equals to 65536. To my surprise, I have not found anything like this in documentation. But I've seen in source code this: // pre: npartition_size != 0 && nnext_size != 0 explicit pool(const size_type nrequested_size, const size_type nnext_size = 32) So is "nnext_size" what I was looking for ? And what does mean "an extension", is there an official proposal of Pool for future standard ?

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Building boost 1.38 on mac os X
by Alain Leblanc 01 Mar '09

01 Mar '09

Hi, I'm having problems (again) building boost on mac OS X 64-bit. Once again specifying architecture=x86 address-model=64 to bjam gives me a message that my cpu does not support the x86-64 instruction set. I was getting the same message with boost 1.34, and it was fine for boost 1.36. I tried getting around the problem by adding cxxflags=-m64 to the bjam execution, but then I get the message at the bottom. Invoking bjam with no option will build everything fine, but it looks like it is a 32-bit build. Did anyone have a same issue and manage to solve it? thanks, a "g++" -o "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/libboost_math_c99l-gcc40-mt-1_38.dylib" -Wl,-h -Wl,libboost_math_c99l-gcc40-mt-1_38.dylib -shared -Wl,--start-group "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/acoshl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/asinhl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/atanhl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/cbrtl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/copysignl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/erfcl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/erfl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/expm1l.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/fmaxl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/fminl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/fpclassifyl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/hypotl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/lgammal.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/llroundl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/log1pl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/lroundl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/nextafterl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/nexttowardl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/roundl.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/tgammal.o" "bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/truncl.o" -Wl,-Bstatic -Wl,-Bdynamic -Wl,--end-group -Wl,--strip-all ...failed gcc.link.dll bin.v2/libs/math/build/gcc-4.0.1/release/threading-multi/libboost_math_c99l-gcc40-mt-1_38.dylib... gcc.link.dll bin.v2/libs/program_options/build/gcc-4.0.1/release/threading-multi/libboost_program_options-gcc40-mt-1_38.dylib ld: unknown option: -h collect2: ld returned 1 exit status

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[boost-users]building with _SECURE_SCL=0
by Igor R 01 Mar '09

01 Mar '09

Hello, When I build 1.38.0 with bjam in release configuration, is it built with * _SECURE_SCL*=*0*? If not, how exactly can I enforce it? ** Thanks.

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[Graph] Using a bit-based ajacency matrix.
by Thorsten Ottosen 01 Mar '09

01 Mar '09

Dear All, Does anybody have experience with the above. That is, to represent the graph as a bit-based ajacency matrix, and then use that together with Boost.Graph? I'm thinking that Boost.Graph will not exploit this representation optimally. Am I correct? Thanks in advance -Thorsten

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newbie thread synchronization question
by Cory Riddell 01 Mar '09

01 Mar '09

I'm a total newbie with the Thread library, so please forgive me if this is a dumb question. Say I make a class called Shared that looks something like this: class Shared { private: boost::mutex monitor; int qty; public: Shared() : qty(0) { } void lock() { monitor.lock(); } void unlock() { monitor.unlock(); } int getQty() { return qty; } void setQty(int q) { qty = q; } }; If I use it in from multiple threads with code that looks like: // s is an instance of Shared s.lock(); int q = s.getQty(); ++q; s.setQty(q); s.unlock(); will it work reliably on a multi-core machine? When the mutex unlock() happens, does that flush the CPU cache and write the value of s.qty to main memory? Does the mutex lock() operation clear the CPU cache and force a reload of s from the main memory? I'm trying to understand how synchronization works among multiple cpus. I've only worked on multithreaded code in Java and there the memory model is well defined. AFAIK, that isn't the case in C++. Cory

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asio tcp socket receive timeout value
by Lennyk 01 Mar '09

01 Mar '09

Hi, I'm using boost 1.35 on Linux. I would like to change the timeout value of the tcp socket receive call. I know that the default value is 30 seconds. Thanks, Lenny.

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unresolved external issue and who do I pass a boost patch to?
by Sean Farrow 01 Mar '09

01 Mar '09

Hi: can Anybody help I'm using the boost::filesystem library, and am including <boost/filesystem/path.hpp> and am getting: 1>O2ServerImpl.obj : error LNK2019: unresolved external symbol "class boost::system::error_category const & __stdcall boost::system::get_system_category(void)" (?get_system_category@system@boost@@YGABVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'system_category''(void)" (??__Esystem_category@system@boost@@YAXXZ) 1>O2ServerImpl.obj : error LNK2019: unresolved external symbol "class boost::system::error_category const & __stdcall boost::system::get_generic_category(void)" (?get_generic_category@system@boost@@YGABVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'generic_category''(void)" (??__Egeneric_category@system@boost@@YAXXZ) I am linking with: libboost_filesystem-vc80-mt-gd-1_39.lib libboost_system-vc80-mt-sgd-1_39.lib Anyone with any ideas? Also I've modified a boost header file, who do I pass this too for update to the svn trunk? Cheers Sean.

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