June 2007 - Boost-users - lists.preview.boost.org

[multi-index /mpl] fatal co mpile error when using a tag in VS7.1 wit h SP1
by hongleij＠126.com 28 Jun '07

28 Jun '07

//boost #include <boost/multi_index_container.hpp> #include <boost/multi_index/hashed_index.hpp> #include <boost/multi_index/member.hpp> #include "boost/multi_index/key_extractors.hpp" using namespace ::boost; using namespace ::boost::multi_index; #include <string> struct Peer { std::string userid; int age()const {return age_;} private: int age_; }; struct CPeer:public Peer { int index; }; struct Peer_age_extractor { typedef int result_type; const int operator()(const CPeer& peer)const { return peer.age(); } }; struct userid{}; struct age{}; typedef multi_index_container< CPeer, indexed_by< hashed_unique<tag<userid>,member<Peer,std::string,&Peer::userid> >, hashed_non_unique<tag<age>,const_mem_fun<Peer,int,&Peer::age> >// // hashed_non_unique<const_mem_fun<Peer,int,&Peer::age> > //without a tag will be ok. //hashed_non_unique<tag<age>,Peer_age_extractor > //this line with cause the same question. > > CPeersType; I get this in vs7.1 with sp1: ------ Build started: Project: multi_index1, Configuration: Debug Win32 ------ Compiling... hash_test.cpp f:\boost_1_34_0\boost\mpl\aux_\preprocessed\plain\apply_wrap.hpp(48) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'f:\vs70builds\6030\vc\Compiler\CxxFE\sl\P1\C\main.c', line 1164) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information Build log was saved at "file://g:\cpp\boost\multi_index1\Debug\BuildLog.htm" multi_index1 - 1 error(s), 0 warning(s) yet this can compile well in gcc 3.4. i really don't know why. many thanks for JOAQUIN LOPEZ MU?Z 's past help.;-) 百万玩家同玩的乐园，人气爆发的梦幻西游

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Passing variable no. of arguments in macro
by Prasanta K Chakravarty 28 Jun '07

28 Jun '07

Hi, I have a requirement of passing variable no. of arguments in macro. So, I have build Boost wave library and got .dll and .lib file. But I am not able to use it. Please help me out how to use that one. Thanks & Regards, Prasanta

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Re: [Boost-users] [serialisation]Portable Binary Archives
by Pfligersdorffer, Christian 27 Jun '07

27 Jun '07

boost-users-bounces(a)lists.boost.org wrote: >> If you're talking about portable binary archives for >> Boost.Serialization, there's been talk, but I'm not sure what >> the status is - anyone have an implementation? I'd be willing >> to help / work with someone on it. >> > > That's what I am looking for. We need to get the file sizes down. We > could use text (XML is great for debugging but too big for final > release), but again that has its overheads. We generally don't use > floating point so that may help us. The link I posted does have a > portable implementation which I think uses IEEE754. I just wondered if > there was an official boost:serilisation version; obviously not!! Hello James, there _is_ a portable binary archive provided with the examples but as Robert Ramey points out in the code documentation, it is not complete as it lacks the floating point conversion. But if Johan is willing to fill this gap I am perfectly confident that we could have a comprehensive implementation in a few weeks. That is, if the issue that Dan Leibovich found in the example can be resolved. I follow the portable archive discussion with great interest since I would very much like to use it too. PS @ Cliff: Very interesting post! Do you know about when and if the endian library will enter the official boost release? I would find that useful too. Regards, -- Christian Pfligersdorffer Software Engineering EOS GmbH

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[Serialization] portable binary archive
by Dan Leibovich 27 Jun '07

27 Jun '07

Hi, Few month ago I have started a thread about an issue with the potable binary archive demo: http://lists.boost.org/boost-users/2007/03/26274.php Robert, Were you able to find the exact bug? Thanks in advance Dan

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[serialization] problem with derived classes
by Avery Fay 27 Jun '07

27 Jun '07

Hello, I'm having an issue with serializing derived classes from a base class pointer. I think I've narrowed it down to the simplest possible code. I get an "unregistered class" exception at runtime even though I've registered the derived class with BOOST_CLASS_EXPORT. Here's the code: ---------------------------------------------- main.cpp: #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <sstream> #include "A.hpp" #include "X.hpp" int main() { std::stringstream ss; const A * const test = new X; { boost::archive::text_oarchive oa(ss); oa << test; } A *test2; { boost::archive::text_iarchive ia(ss); ia >> test2; } return 0; } ----------------------------------------------- A.hpp: #pragma once #include <boost/serialization/access.hpp> class A { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int) { ar & test; } int test; public: A() : test(0) {} virtual ~A() {} }; ----------------------------------------------- X.hpp: #pragma once #include <boost/serialization/base_object.hpp> #include "A.hpp" class X : public A { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int) { ar & boost::serialization::base_object<A>(*this); } }; ------------------------------------------------ X.cpp: #include "X.hpp" #include <boost/serialization/export.hpp> BOOST_CLASS_EXPORT(X) ----------------------------------------------- As you can see, I don't have BOOST_CLASS_EXPORT in the X.hpp header. This is the way I originally had it but then I got multiple definition link errors when more than one class derived from A. The suggestion in the serialization docs was to move the macro to a .cpp file. Full output when I run this: terminate called after throwing an instance of 'boost::archive::archive_exception' what(): unregistered class Aborted (core dumped) Any help would be appreciated greatly, Avery

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Re: [Boost-users] problem... maybe boost could help
by Ovanes Markarian 27 Jun '07

27 Jun '07

My idea is based on fact that you (program developer or another developer) know what is going to be send. What you are trying to do is erasing the type to some base and that would not work. So you send event must handle derived type and put it correctly to variant. A possible solution would be: template<class EventType_> void sendEvent(EventType_ const& ev) { m_eventContainer = ev; //<- now compiler knows exactly the type of ev m_derivedHelper->dispatchEvent(&m_eventContainer); } Best Regards, Ovanes On Fri, June 22, 2007 21:41, Lukasz wrote: > > Thanks for the fast reply. Your solution looked very good for my problem, so i tried to apply it. >However, there seems to be a problem. At the point when i call dispatchEvent (as in the below >example) is when i have the actual event to be sent. But i still only have a pointer to the base >class and by assigning it to the container, it always gets interpreted as a base event, even when >in reality it's some derived type. > > I tried a couple of approaches. In the first one, my variant contains only the derived type (base class is Event, derived is EventTest) , i.e. > > typedef boost::variant<EventTest> event_container; > > .... > event_container m_eventContainer; > ... > > void sendEvent(Event * event) > { > // Call Helper to dispatch the event to correct type > m_eventContainer = *event; > m_derivedHelper->dispatchEvent(&m_eventContainer); > } > > This won't work. The compiler complains that none of the overloads for >boost::detail::variant::make_initializer_node::apply can convert parameter 2. If i add the base >event type to the variant list, i.e. > > typedef boost::variant<Event, EventTest> event_container; > > it will work, but it will always trigger the processEvent with the base > class type. I haven't found any information as to how boost::variant treats a case of a pointer to >a base class (in this case, i'm not even actually passing the pointer but an object since for >pointers it just doesn't seem to work). Should it be able to automatically convert the type ? If >not, then i guess i'm back to square one, since i still can't cast the event... unless i maybe >misunderstood something ? The code i tried is pretty much what you gave me, with some minor >modifications. > > Thanks in advance for any further assistance. > > Lukasz K. > > [...]

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[filesystem] where is replace_extension
by frederic.bron＠alcan.com 27 Jun '07

27 Jun '07

In the documentation of filesystem (1.34.0), at this position: http://www.boost.org/libs/filesystem/doc/tr2_proposal.html#Header-filesyste… we can read : template <class Path> Path replace_extension(const Path & p, const typename Path::string_type & new_extension); However, in boost_1_34_0.tar.bz2, I cannot find replace_extension in any file. Where is it? Regards, F. Bron Avis : Ce message et toute pièce jointe sont la propriété d'Alcan et sont destinés seulement aux personnes ou à l'entité à qui le message est adressé. Si vous avez reçu ce message par erreur, veuillez le détruire et en aviser l'expéditeur par courriel. Si vous n'êtes pas le destinataire du message, vous n'êtes pas autorisé à utiliser, à copier ou à divulguer le contenu du message ou ses pièces jointes en tout ou en partie. Notice: This message and any attachments are the property of Alcan and are intended solely for the named recipients or entity to whom this message is addressed. If you have received this message in error please inform the sender via e-mail and destroy the message. If you are not the intended recipient you are not allowed to use, copy or disclose the contents or attachments in whole or in part.

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[interprocess] Interprocess and Daniel James'es unordered containers
by Aaron W. LaFramboise 27 Jun '07

27 Jun '07

I'm trying to use Daniel James'es unordered containers, from the vault, with Interprocess: typedef ip::allocator<T, ip::managed_windows_shared_memory::segment_manager> T_allocator; typedef typedef boost::unordered_set<T, T_hash, std::equal_to<T>, T_allocator> T_set; I get this error: boost\unordered\detail\hash_table_impl.hpp(419) : error C2039: 'destroy' : is not a member of 'boost::interprocess::allocator<T,SegmentManager>' The method 'destroy' is missing in CVS, even though its still present in the documentation at <http://cloud.prohosting.com/newfunk/boost/libs/interprocess/doc/html/boost/…>. Is there some other general-purpose allocator that would work here? Why is this method missing?

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Boost.Function and template function
by gast128 27 Jun '07

27 Jun '07

Dear all, I get a crash when I try to wrap a template function with Boost.Function. I use VStudio 2003 sp1. But maybe the used syntax is wrong: #include <boost/function.hpp> struct SomeClass { }; template <typename T> bool func_template(T* p) { return (p != NULL); } void example1() { bool (*pf) (SomeClass*) = &func_template<SomeClass>; boost::function<bool (SomeClass*)> fc1 = &func_template<SomeClass>; boost::function1<bool, SomeClass*> fc2 = &func_template<SomeClass>; boost::function<bool (SomeClass*)> fc3 = pf; fc1(NULL); //crashes fc2(NULL); //crashes also fc3(NULL); //ok } Wkr, me

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Wave lib - MS compatibility issue?
by NeBlackCat 26 Jun '07

26 Jun '07

Firstly hi everybody - this is my first post, and I'm just finding my feet with Boost:Wave. I've built and am playing with the wave driver (wave.exe) on an existing open source project, but I get an "error: ill formed preprocessor directive: import" error with the at a line: #import <msado15.dll> \ rename("EOF","adoEOF") \ no_namespace I thought this might have been an MS compatibility thing, as importing COM type libraries is obviously Windows-specific (and afaik #import does something different in GCC), but I've tried recompiling with BOOST_WAVE_SUPPORT_MS_EXTENSIONS (and have tried lots of other things) and it doesn't make any difference. Google hasn't shown anything up either. Does anyone know if I can turn this error off somehow?

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