August 2007 - Boost-users - lists.boost.org

Re: [Boost-users] Serialization of hashmap
by Hansi Hansi 09 Aug '07

09 Aug '07

Hello, I don't know If I'm wrong. To install boost I have used the installer from boost-consulting. At the moment I'm using version 1.34.0. I have set the configuration makros in the follwing way #define BOOST_HAS_HASH #define BOOST_STD_EXTENSION_NAMESPACE stdext #define STD BOOST_STD_EXTENSION_NAMESPACE The problem is that during compiling I get 2 errors: Error 133 error C2039: 'resize' : is not a member of 'stdext::hash_map<_Kty,_Ty,_Tr>' C:\boost_1_34_0\boost\serialization\hash_collections_load_imp.hpp 46 Error 134 error C2039: 'bucket_count' : is not a member of 'stdext::hash_map<_Kty,_Ty,_Tr>' C:\boost_1_34_0\boost\serialization\hash_collections_save_imp.hpp 43 The test program doesn't work to compile too. There are problems with the following lines: namespace BOOST_STD_EXTENSION_NAMESPACE { template<> struct hash<random_key>{ <<<<<<<<<------------- line 156 std::size_t operator()(const random_key& r) const { return (std::size_t)r; } }; } // namespace BOOST_STD_EXTENSION_NAMESPACE Error 9 error C2143: syntax error : missing ';' before '<' c:\boost_1_34_0\libs\serialization\test\test_map.cpp 156 Is there some other makro that I have to define? Best Regards and many thanks for your help Hansjörg > -----Ursprüngliche Nachricht----- > Von: boost-users(a)lists.boost.org > Gesendet: 09.08.07 08:54:35 > An: boost-users(a)lists.boost.org > Betreff: Re: [Boost-users] Serialization of hashmap > > There is a test program - test_map which should demonstrate the > functionality. > > It depends upon standard boost macros for stdext: so if the test > doesnt invoke the hash map, you might check to see if the config system > is correct. > > Let me know what you find out. > > Robert Ramey > > Hansi Hansi wrote: > > Hello, > > > > Sorry I have forgotten to write the subject in the last post. > > > > is there a possibility to serialize a hash_map with the vc8.0 > > compiler? this compiler has defined a hash_map under the stdext > > namespace. It seems that the implementation in boost doesn't work at > > the moment for this class. > > > > Or is there another hash_map implementation available which can be > > serialized? > > > > Best regards > > Hansjörg > > > > > > _____________________________________________________________________ > > Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! > > http://smartsurfer.web.de/?mc=100071&distributionid=000000000066 > > > > > > <hr> > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > __________________________________________________________________________ Erweitern Sie FreeMail zu einem noch leistungsstärkeren E-Mail-Postfach! Mehr Infos unter http://produkte.web.de/club/?mc=021131

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Memory pool management (v1-34-1)
by cisjar 09 Aug '07

09 Aug '07

I am using memory pool objects and I had a little trouble when ran first time my multi-threaded application under Linux. I looked at sources (detail/mutex.hpp) and in my opinion an automatic recognition the multi-thread mode is done improperly. In my project I used only headers from pool library and I had to explitly defined the BOOST_HAS_THREADS macro. There is not any information about it in documentation. From other boost libraries I know that is not intended to define this macro by users. cisjar

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Serialization of hashmap
by Hansi Hansi 09 Aug '07

09 Aug '07

Hello, Sorry I have forgotten to write the subject in the last post. is there a possibility to serialize a hash_map with the vc8.0 compiler? this compiler has defined a hash_map under the stdext namespace. It seems that the implementation in boost doesn't work at the moment for this class. Or is there another hash_map implementation available which can be serialized? Best regards Hansjörg _____________________________________________________________________ Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! http://smartsurfer.web.de/?mc=100071&distributionid=000000000066

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Fwd: Re: timeout events in Boost.Statechart
by Chris Paulse 08 Aug '07

08 Aug '07

>> I ended up implementing timeout support with a WM_TIMER handler in the >> parent of the state machine class. ... > > Does the WM_TIMER handler really add the event to the queue of the > state_machine subclass object? If so, then you might have introduced > a race condition. WM_TIMER handlers are called in a dedicated thread, > right? >From my understanding of the documentation of SetTimer and my use of it, everything should be working from the same thread (WM_TIMER messages are posted to the main thread's message queue, where they are processed while the thread is idle). So, I don't think there's a race condition. >> Also, like the Camera example, I implemented a >> post_event in the >> constructor/entry of some states, which also requires derivation >> from state, > > Correct. > >> and awkward instancing of the event. > > I don't understand. You mean the special constructor you have to add > to the state, right? Well, that, but more importantly, the cast inside of the post_event. Making calls to post_event from a constructor/enter seem like a fairly typical use case. >> Would using methods (Entry/Exit) >> instead of >> the constructor/destructor ease some of these problems? > > This is a somewhat controversical topic. During formal review there > were a few people who favored entry() and exit() functions over the > current ctor/dtor design. Thanks for the explanation (removed for brevity), and the sample code!

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[program_options] patch - optional argument support (gnu getopt_long style)
by Bryan Green 08 Aug '07

08 Aug '07

Attached is a patch to program_options that implements optional argument support, in the style of GNU getopt_long. It adds one new method to 'value_type': 'implicit_value()'. The idea is that, if the option is given without an argument, it is assigned an "implicit" value. Otherwise, if the long-option is given an explicit argument via the equals sign (--arg=value), or the short-option is given an adjacent argument (-avalue), the explicit value will override the implicit one. For example: desc.add_options() ("proxy,p", value<int>(&proxy_port)->implicit_value(DefaultProxyPort), "run proxy service") ; ... if (vm.count("proxy")) enable_the_proxy(proxy_port); ./prog --proxy --opt2 --opt3 -> enables proxy on default port. ./prog --proxy=9000 --opt2 --opt3 -> enables proxy on port 9000. ./prog --opt2 --opt3 -> does not enable the proxy. -Bryan

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Subject : [Serialization] linker problem, serialization method cannot be found.
by Oliver Kania 08 Aug '07

08 Aug '07

Hello and thanks for the help I received so far. here is my current problem: The class I try to serialize is: class LIBPALO_NG_CLASS_EXPORT CubeCache : public CUBE_INFO { public: friend class boost::serialization::access; CubeCache(); ~CubeCache(); void setSequenceNumber( unsigned int sequenceNumber ) { m_SequenceNumber = sequenceNumber; } unsigned int getSequenceNumber() const { return m_SequenceNumber; } private: unsigned int m_SequenceNumber; template<class Archive> void serialize( Archive &ar, const unsigned int version ); }; the cpp file looks as follows: #include "CubeCache.h" #include <boost/serialization/base_object.hpp> namespace jedox { namespace palo /* palo */ { template<class Archive> void CubeCache::serialize( Archive &ar, const unsigned int version ) { // save/load base class information ar & boost::serialization::base_object<CUBE_INFO>( *this ); ar & m_SequenceNumber; } CubeCache::CubeCache(){;} CubeCache::~CubeCache(){;} } } /* jedox */ The CUBE_INFO structure serializes just fine. There are no linkage problems with the following code: int main( int argc, char* argv[] ) { CUBE_iNFO* const c = new CUBE_INFO(); std::ofstream ofs("filename"); // save data to archive { boost::archive::text_oarchive oa( ofs ); // write class instance to archive oa << ( c ); // archive and stream closed when destructors are called } return 0; } However, when I use CubeCache instead of CUBE_INFO in the above code, i get a linkage error: ====================================================================== libpalo_ng.obj : error LNK2019: unresolved external symbol "private: void __thiscall jedox::palo::CubeCache::serialize<class boost::archive::text_oarchive>(class boost::archive::text_oarchive &,unsigned int)" ... ====================================================================== There are no linkage problems with the library when i do not use boost::serialization. I guess this happens when the linker tries to link with the serialization library. LIBPALO_NG_CLASS_EXPORT is defined as: # define LIBPALO_NG_CLASS_EXPORT __declspec(dllexport) Regards, Oliver

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[serialization] Writing an old version of a class
by Pfligersdorffer, Christian 08 Aug '07

08 Aug '07

Hello Robert, hello all, I know it is stated in the boost::serialization library documentation that per definition always the latest version of a class goes to the archive. I wonder if there is a way to change this behaviour and choose the version number for my class at runtime. Obviously this feature would be useful in a system of two dependent modules where either the producer or the consumer could by updated to a newer version without the other one being neccessarily updated too. Maybe this has already been discussed but I could not find anything about it on the web. However my strong suspicion is that there is no such option within the library and I will have to provide a solution within the affected classes. Another thing: I specialize boost::archive::detail::heap_allocator<T> for my types to use my own memory management :-) Any objection to that? Finally I want to thank Robert Ramey for his fabulous library and his always timely and helpful answers. I think from the user perspective he stands as a positive example for others. Regards, -- Christian Pfligersdorffer EOS Software Engineering

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<kein Betreff>
by Hansi Hansi 08 Aug '07

08 Aug '07

Hello, is there a possibility to serialize a hash_map with the vc8.0 compiler? this compiler has defined a hash_map under the stdext namespace. Or is there another hash_map implementation available which can be serialized? Best regards Hansjörg __________________________________________________________________________ Erweitern Sie FreeMail zu einem noch leistungsstärkeren E-Mail-Postfach! Mehr Infos unter http://produkte.web.de/club/?mc=021131

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Serialization & enums
by Gross, Steve 07 Aug '07

07 Aug '07

Hi folks. I'm learning the basics of the serialization library right now. I'd like to know if there's a known tactic for archiving enums with textual tokens, rather than the int value itself. For instance, consider the following code: I set up an enum called status_t, and a class Foo that has a status_t as a data member. In Foo's serialize function, I record the status_t (myStatus). enum status_t { ON, OFF }; class Foo { status_t myStatus; friend class boost::serialization::access; template<class Archive> serialize(...) { ar & BOOST_SERIALIZATION_NVP(myStatus); } }; The xml output file looks sort of like this: <Foo> <myStatus>0</myStatus> </Foo> The file that is generated when serialize() is invoked certainly works, but the value for myStatus appears as an int. What if I want to convert the int to a string in the archive? That is, I want the xml file to look like this: <Foo> <myStatus>ON</myStatus> </Foo> Are there any good strategies for doing this? Thanks, --Steve (sgross(a)sjm.com)

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term by term product of vectors (or proxies thereof)
by e r 07 Aug '07

07 Aug '07

hi, what's the best way to achieve x*=y? where x and y are vectors (or proxies) of identical size? although i wrote a function (below) i hope there's already some ublas related facility to do so. template<typename D> class Op_product_term_by_term{ public: Op_product_term_by_term(D& dest):iter(dest.begin()),end(dest.end()){}; void operator()(double elem); private: typename D::iterator iter; typename D::iterator end; }; template<typename D> void Op_product_term_by_term<D>::operator()(double elem){ if(iter<end){ *(iter++)*=elem; }else{ throw; }; }; template<typename D, typename B> void product_term_by_term(D& dest,const B& by){ if(dest.size()==by.size()){ for_each(by.begin(),by.end(),Op_product_term_by_term<D>(dest)); }else{ throw; }; }; ps: should i post this kind of ad in boost/ublas or boost/users?

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