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

pool allocator performance with multiple threads
by Michael Dickey 23 Mar '08

23 Mar '08

Does anyone know if the fast_pool_allocator is supposed to work in a multithreaded environment? I know that it is "thread-safe," but I'm getting some really discouraging test results from it. Namely, using fast_pool_allocator is consistently performing about 10 times SLOWER for me than new/delete whenever multiple threads are involved. I've tested and come up with the same results on three different platforms: Mac, Linux and Windows (MSVC). I get the impression that I just need to roll my own allocator if I'm using more than one thread, but I'm hoping that this is not the case. If it helps, I can put together and post some source code that demonstrates these results. Thanks, -Mike

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[Filesystem] Unicode support
by David Bertrand 23 Mar '08

23 Mar '08

When compiling unicode filesystem functions, I get linking errors : Test error LNK2019: unresolved external symbol "class boost::filesystem::file_status __cdecl boost::filesystem::detail::status_api(class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > const &,unsigned int &)" (...) I can reproduce it easily by compiling following line of code: fs::exists(L"test.gif"); The non-unicode variants links fine, it's really only the unicode stuff. Since "\libs\filesystem\test\wide_test.cpp" must be working, I assume I'm missing a compiler macro or something ? Anyone seen this already ? My setup : Windows XP SP2 MSVC 7.1 SP1 Boost 1.34.1 downloaded from boost-consulting.com This email and any attachments is confidential, may be legally privileged and is intended for the use of the addressee only. If you are not the intended recipient, please note that any use, disclosure, printing or copying of this email is strictly prohibited and may be unlawful. If received in error, please delete this email and any attachments and confirm this to the sender.

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phoenix compile problems
by Olaf Peter 22 Mar '08

22 Mar '08

Hello, here my compile problem using phoenix (for use with spirit): ---8<--- template<typename ActionsT> struct tag_keyword_action { template <typename ScanT, typename Iter1T, typename Iter2T> struct result { typedef void type; }; explicit tag_keyword_action( const ActionsT& action ) : action( action ) { } template <typename ScanT, typename Iter1T, typename Iter2T> void operator()( const ScanT& scan, const Iter1T& bgn, const Iter2T& end ) const { action.on_tag( // the real action / assign class std::string( bgn, end ), scan.first.get_position().line ); } const ActionsT& action; }; template<typename ActionsT> struct ver_parser { typedef ::phoenix::function< tag_keyword_action<ActionsT> > keyword_tag_type; explicit ver_parser( const ActionsT& action ) : tag_keyword( action ) { } template <typename ScannerT> std::ptrdiff_t operator()(const ScannerT& scan, result_t& result) const { ... rule_t rule = lexeme_d[ ... ][tag_keyword( var( scan ), arg1, arg2 )] ... } const keyword_tag_type tag_keyword; }; template <typename ActionsT = parse_actions, typename ErrorHandlerT = parse_error_handler> struct grammar : sp::grammar< grammar<ActionsT, ErrorHandlerT> > { explicit grammar(const ActionsT& actions = ActionsT(), const ErrorHandlerT& handler = ErrorHandlerT()) : actions( actions ), error_handler( handler ) { } template <typename ScannerT> struct definition { ... explicit definition( const grammar& self ) : ver_p( self.actions ) { ... } ... const sp::functor_parser< ver_parser<ActionsT> > ver_p; }; ... }; --->8--- The (beautified) error message is: error: no matching function for call to 'boost::spirit::functor_parser<ver_parser<parse_actions> >::functor_parser(const parse_actions&)' candidates are: boost::spirit::functor_parser<FunctorT>::functor_parser(const FunctorT&) [with FunctorT = ver_parser<parse_actions>] boost::spirit::functor_parser<FunctorT>::functor_parser() [with FunctorT = ver_parser<parse_actions>] boost::spirit::functor_parser<ver_parser<parse_actions> >::functor_parser(const boost::spirit::functor_parser<ver_parser<parse_actions> >&) What is the correct syntax, is this way a good choice? I want to tag the keyword in the given data files with their lines to display them in a browser later. Thanks, Olaf

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[lambda] Confusion!
by Robert Dailey 22 Mar '08

22 Mar '08

Hi, I have defined a global overloaded operator<<. I want to use this overloaded operator in std::for_each(), but it must be properly deduced since there are many global overloads for this operator. For example: class Stream { // This is an abstract class (cannot instantiate) }; Stream& operator<< ( Stream& stream, char data ) { stream.write( data ); return stream; } Stream& operator<< ( Stream& stream, std::vector<char>& buffer ) { using namespace boost::lambda; std::for_each( buffer.begin(), buffer.end(), var( stream ) << _1 ); // This lambda should simply be binding to the overloaded operator<< above, right? return stream; } When I compile this, MSVC9 tells me: 1>c:\program files\microsoft visual studio 9.0\vc\include\algorithm(29) : error C2064: term does not evaluate to a function taking 1 arguments 1> class does not define an 'operator()' or a user defined conversion operator to a pointer-to-function or reference-to-function that takes appropriate number of arguments What am I doing wrong? Do I need to be using boost bind instead? If so, how can I use boost.bind to map a global operator? Will it correctly deduce which overload to use?

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"Assignment operator could not be generated" warnings under MSVC 2005
by Kevin Scarr 22 Mar '08

22 Mar '08

Sorry about the cross-post to asio.user, it is a more general question. I am receiving a number of warnings along the lines of the above when I compile code using boost libraries. I see the warnings with Boost.Variant, Boost.asio and others. My code compiles, and appears to work fine, however, I am always nervous about these kinds of warnings because I suspect there is something waiting to bite me. I guess I am concerned as to what in my code is causing the compiler to want to generate assignment operators. Are these warnings symptomatic of a basic mistake I am making? I know that you can't see the code, so this is only a general question. If people think this might be a real problem, I am happy to try to make a small code snippet to illustrate the problem. Thanks for being there! Kevin Some examples: Warning 3 warning C4512: 'boost::asio::detail::win_iocp_io_service::auto_work' : assignment operator could not be generated; c:\boost_1_34_1\include\boost-1_34_1\boost/asio/detail/win_iocp_io_service.hpp(574) : see declaration of 'boost::asio::detail::win_iocp_io_service::auto_work' c:\boost_1_34_1\include\boost-1_34_1\boost\asio\detail\win_iocp_io_service.hpp 588 Warning 9 warning C4512: 'boost::detail::variant::invoke_visitor<Visitor> with [Visitor=boost::detail::variant::apply_visitor_binary_unwrap<const G2::doConnectConsumerToProducer,G2::G2ProducerTypes>]' : assignment operator could not be generated; c:\boost_1_34_1\include\boost-1_34_1\boost/variant/variant.hpp(1771) : see reference to class template instantiation 'boost::detail::variant::invoke_visitor<Visitor> with [Visitor=boost::detail::variant::apply_visitor_binary_unwrap<const G2::doConnectConsumerToProducer,G2::G2ProducerTypes>]' being compiled; c:\boost_1_34_1\include\boost-1_34_1\boost/variant/detail/apply_visitor_unary.hpp(56) : see reference to function template instantiation 'void boost::variant<T0_,T1,T2>::apply_visitor<Visitor>(Visitor &) with [T0_=G2::G2Consumer<G2::buffer> *,T1=G2::G2Consumer<G2::packet> *,T2=G2::G2Consumer<G2::message> *,Visitor=boost::detail::variant::apply_visitor_binary_unwrap<const G2::doConnectConsumerToProducer,G2::G2ProducerTypes>]' being compiled; c:\boost_1_34_1\include\boost-1_34_1\boost/variant/detail/apply_visitor_binary.hpp(165) : see reference to function template instantiation 'void boost::apply_visitor<boost::detail::variant::apply_visitor_binary_unwrap<Visitor,Visitable2>,Visitable1>(boost::detail::variant::apply_visitor_binary_unwrap<Visitor,Visitable2> &,Visitable &) with [Visitor=const G2::doConnectConsumerToProducer,Visitable2=G2::G2ProducerTypes,Visitable1=G2::G2ConsumerTypes,Visitable=G2::G2ConsumerTypes]' being compiled; .\interfaces.cpp(133) : see reference to function template instantiation 'void boost::apply_visitor<G2::doConnectConsumerToProducer,G2::G2ConsumerTypes,G2::G2ProducerTypes>(const Visitor &,Visitable1 &,Visitable2 &) with [Visitor=G2::doConnectConsumerToProducer,Visitable1=G2::G2ConsumerTypes,Visitable2=G2::G2ProducerTypes]' being compiled c:\boost_1_34_1\include\boost-1_34_1\boost\variant\variant.hpp 894

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boost::serialization problem with gcc 4.3.0
by bernd.speiser＠t-online.de 21 Mar '08

21 Mar '08

Hi all, I am using boost::serialization (from version 1.34.1) within a larger project and have just switched to the recent gcc 4.3.0 release. Now, everything, including serialization code, works just fine on most of our machines (ix86 under openSuSE 10.2). However, on a x86_64 system (also openSuSE 10.2), the same code produces errors: /usr/local/include/boost-1_34_1/boost/serialization/vector.hpp:126: error: redefinition of 'struct boost::serialization::implementation_level<std::vector<long int, std::allocator<long int> > >' /usr/local/include/boost-1_34_1/boost/serialization/vector.hpp:126: error: previous definition of 'struct boost::serialization::implementation_level<std::vector<long int, std::allocator<long int> > >' /usr/local/include/boost-1_34_1/boost/serialization/vector.hpp:126: error: redefinition of 'struct boost::serialization::implementation_level<std::vector<long unsigned int, std::allocator<long unsigned int> > >' /usr/local/include/boost-1_34_1/boost/serialization/vector.hpp:126: error: previous definition of 'struct boost::serialization::implementation_level<std::vector<long unsigned int, std::allocator<long unsigned int> > >' The error messages are NOT produced with boost version 1.33.1. The error occur even if I include the vector.hpp file into a piece of code which does not actually use serialization functionality. Any ideas what to do? Thanks for any help. Best regards Bernd ======================================================================= Bernd Speiser Institut für Organische Chemie Auf der Morgenstelle 18 temporary address: Auf der Morgenstelle 15 D-72076 Tübingen Germany phone: +49-7071-2976205 (office) +49-7071-2976242 (laboratory) +49-7071-2972098 (secretary) fax: +49-7071-295518 e-mail: bernd.speiser(a)uni-tuebingen.de Internet: http://www.uni-tuebingen.de/speiser =======================================================================

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boost::serialization oserializer weirdness
by Jerry 21 Mar '08

21 Mar '08

Using Boost 1.34.1 with VC++ 7.1 SP1 I have existing code which serializes/de-serializes correctly to boost::archive::xml_oarchive Within the same .cpp file I'm trying to serialize instances of the same hierarchy to boost::archive::binary_oarchive using this code: // ultimate sink for serialized data std::ostringstream os; // binary format is OK as it is going onto the clipboard boost::archive::binary_oarchive oa(os); // temp storage std::vector<CDiagramEntity*> vec; // only serialize selected items for (std::vector<CDiagramEntity*>::iterator it = m_entities.begin(); it != m_entities.end(); ++it) { if ((*it)->IsSelected()) vec.push_back((*it)); } // just serialize the selected item vector (*) oa & BOOST_SERIALIZATION_NVP(vec); * - This is failing in oserializer.hpp line 417, the relevant code being: // sice true_type is valid, and this only gets made if the // pointer oserializer object has been created, this should never // fail bpos_ptr = archive_pointer_oserializer<Archive>::find(* true_type); assert(NULL != bpos_ptr); // <------------------ this assert triggered. I note the confident comment above find(). Can anyone help here? Many thanks Jerry

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algorithm::string
by Elisabeth Benoit 21 Mar '08

21 Mar '08

Can someone please tell me how to use boost::algorithm::is_alnum(). I first thought I could do std::string test boost::algorithm::is_alnum(test) but obviously the function doesn't take a string as a parameter. I've been searching for an example in the doc and on the web, but niet. an example would be greatly appreciated. Elisabeth

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Re: [Boost-users] Boost-users Digest, Vol 1577, Issue 3
by David Ward 21 Mar '08

21 Mar '08

BM: Great - see you Saturday. Get a kick out of life - play soccer! David -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of boost-users-request(a)lists.boost.org Sent: Thursday, March 20, 2008 8:03 PM To: boost-users(a)lists.boost.org Subject: Boost-users Digest, Vol 1577, Issue 3 Send Boost-users mailing list submissions to boost-users(a)lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. Re: Boost-users Digest, Vol 1577, Issue 2 (Abir Basak) 2. Re: unordered_set insert returns const_iterator ? (Abir Basak) 3. Re: Boost-users Digest, Vol 1577, Issue 2 (Daniel James) 4. [addressof] Can't obtain the address of an instance of an anonymous struct (Jean-Francois Bastien) 5. Re: [InterProcess] Compatibility with Boost multi_array (Ion Gazta?aga) 6. [boost-users][test] Problems calling ::system() (... child has exited ...) (Darren Garvey) ---------------------------------------------------------------------- Message: 1 Date: Thu, 20 Mar 2008 23:27:32 +0530 From: "Abir Basak" <abirbasak(a)gmail.com> Subject: Re: [Boost-users] Boost-users Digest, Vol 1577, Issue 2 To: boost-users(a)lists.boost.org Message-ID: <b50981650803201057h2bc805b5o5e57bf92243d749d(a)mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" > > I don't have access to that compiler. I tried running similar code in > Visual C++ 6.5 and Visual C++ express 8, and they both worked. I can > try adding something to the unit tests but that will take me a while > to work through. At the end of this email is the code I tested with, > can you try it on your compiler? If it works, I'm doing something > different to you, do you have any idea what? > > thanks, > > Daniel > > #include <boost/unordered_map.hpp> > #include <boost/tuple/tuple.hpp> > #include <iostream> > > int main() { > typedef boost::unordered_multimap<char, int> Mymap; > Mymap c1; > > c1.insert(Mymap::value_type('a', 1)); > c1.insert(Mymap::value_type('a', 2)); > c1.insert(Mymap::value_type('b', 3)); > c1.insert(Mymap::value_type('c', 4)); > > Mymap::iterator it,end; > boost::tie(it,end) = c1.equal_range('a'); > for( ; it!=end; ++it) { > std::cout<<(*it).second<<" "; > } > } Yes, MSVC 9 (i.e 2008) runs it properly, but MSVC 7.1 (2003 . NET) fails to compile it. It looks like, for some reason node_ = data::next_group(node_); from increment_group() tries to construct data, which is a typedef to BOOST_UNORDERED_TABLE_DATA even while using static function for that. just changing the statement to node_ = next_group(node_); (hash_table_impl.hpp cvs line no 301) works. so it seems, msvc 7. either doesn't support calling static function by class name typedef, or the data typedef is confused with some other (like BOOST_UNORDERED_TABLE) note node_ = BOOST_UNORDERED_TABLE_DATA::next_group(node_); also works fine. i tried to produce some simple test case for this, like class outer{ public: typedef outer outer_t; inline static void func(){} class inner{ void func1(){ outer_t::func();// func() this works;or outer::func() works } }; }; this doesn't work in msvc 7.1 but works in 9.0 . i am not sure if it is valid in standard though. The error is, E:\lib\boost\trunk\boost\unordered\detail\hash_table_impl.hpp(301): error C2039: 'hash_table_data_equivalent_keys<std::allocator<std::pair<char const ,int> > >' : is not a member of 'boost::unordered_detail::hash_table_data_equivalent_keys<Alloc>::iterat or_base' with [ Alloc=boost::unordered_detail::hash_types_equivalent_keys<std::pair<cons t char,int>,char,boost::hash<char>,std::equal_to<char>,std::allocator<std: :pair<const char,int>>>::value_allocator ] thanks abir

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Re: [Boost-users] Boost-users Digest, Vol 1578, Issue 1
by Alexander Pensky 21 Mar '08

21 Mar '08

> ---------- Forwarded message ---------- > From: "Darren Garvey" <darren.garvey(a)gmail.com> > To: boost-users(a)lists.boost.org > Date: Fri, 21 Mar 2008 00:13:07 +0000 > Subject: Re: [Boost-users] boost::asio Visual Studio 8 - fatal error C1189: #error : WinSock.h has already been included > Hi Julian, > > > On 18/03/2008, Julian Cain <jolix(a)mac.com> wrote: > > I have upgraded to VS 8.0 Standard and when compiling ASIO errors on the following: > > > > 1>Unknown compiler version - please run the configure tests and report the results > > 1>C:\tor\trunk\lib\boost\boost/asio/detail/socket_types.hpp(27) : fatal error C1189: #error : WinSock.h has already been included > > > > Is this a known problem? > > > What do you mean by 'compiling asio'? It is a header-only library. :) > > The problem you're seeing is because the (old) winsock.h header has been included. Most people that see this do because they've included windows.h *before* the asio headers. > > You can get around this by defining WIN32_LEAN_AND_MEAN (something like that) before including windows.h, or just by including windows.h after everything else. > > Regards, > Darren > I've noticed the same behavior. I understand there's a workaround, but in my opinion it's still a bug. asio.hpp has a requirement that it must be #included "early enough" or else it won't compile. That's not a well-behaved header, and it's not "boost-y". Other boost components can be #included much later than <windows.h> and they will go through the whole boost/config process and re-including windows.h or winsock.h with no problems. - Alex

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