July 2011 - Boost-users - lists.preview.boost.org

weird Google page when I try to search boost.org
by Robert Ramey 05 Jul '11

05 Jul '11

http://www.google.com/custom?cof=LW%3A277%3BL%3Ahttp%3A%2F%2Fwww.boost.org%… I'm getting a weird response from google when i use the search box on the page www.boost.org. It says: We're sorry... ... but your computer or network may be sending automated queries. To protect our users, we can't process your request right now. See Google Help for more information. I've been getting for about two weeks. Originally I thought it was just a temporary thing. It hasn't gone away and now I'm wonder it if it's just me. I only get it when I use the boost.org search box. Anyone else get this? Robert Ramey

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Re: [Boost-users] weird Google page when I try to search boost.org
by Edward Rankin 05 Jul '11

05 Jul '11

On Tue, Jul 5, 2011 at 4:23 PM, <boost-users-request(a)lists.boost.org> wrote: > > From: Will Watts <willw(a)applied.co.uk> > To: boost-users(a)lists.boost.org > Date: Tue, 05 Jul 2011 09:23:36 +0100 > Subject: Re: [Boost-users] weird Google page when I try to search > boost.org > Me three. > > Will Watts > > > Not me. However, I am using https-everywhere extension with my firefox which gives me a https url. When I try it in IE, I get the same problem.

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Re: [Boost-users] [review][assign] Assign v2 review result
by er 04 Jul '11

04 Jul '11

> I would like to thank Erwann again for all his hard work, and everyone > who participated in the discussion during the review. > Likewise, I thank everyone who participated and will take their comments seriously, as summarized above. I also thank John very much for his outstanding job as a review manager. > John Bytheway > Review Manager > > _______________________________________________ > Unsubscribe& other changes: http://lists.boost.org/mailman/listinfo.cgi/boost >

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Boost::Serialization and MFC Doc/View architecture
by Colin Caprani 04 Jul '11

04 Jul '11

Hi All, I'm porting an existing MFC C++ application to use Boost::Serialization for XML files. My CDocument object contains all the data for the app. I've implemented the serialize function as: template<class Archive> void CMyDoc::serialize(Archive& ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(m_Param1) & BOOST_SERIALIZATION_NVP(m_Param2); } To capture the save and load events, in the CMyDoc.cpp file I have: BOOL CMyDoc::OnOpenDocument(LPCTSTR lpszPathName) { clear(); // clear current params //if (!CDocument::OnOpenDocument(lpszPathName)) // Old MFC serialize code // return FALSE; CEvolveTrafficDoc* pDoc = this; // pointers the same here std::ifstream ifs(lpszPathName); boost::archive::xml_iarchive ia(ifs); ia >> boost::serialization::make_nvp("MyDoc",pDoc); // pointer changes here return TRUE; } BOOL CMyDoc::OnSaveDocument(LPCTSTR lpszPathName) { //if (!CDocument::OnSaveDocument(lpszPathName)) // Old MFC serialize code // return FALSE; std::ofstream ofs(lpszPathName); boost::archive::xml_oarchive oa(ofs); oa << boost::serialization::make_nvp("MyDoc",this); return TRUE; } Saving a document works fine. The problem is that loading a document doesn't work. The boost library seems to copy the CMyDoc object because the pointer comes back a different address. This means that the loaded file isn't loaded into the current document. Can a CDoc overwrite itself with boost? It can with MFC CArchive. If I overload the CMyView to capture the file open and save events, the MRU list management offered by the Doc/View architecture won't happen. I'm sure this has been done a million times, but I can't find any information online. Weird! Any help much appreciated. Thanks, Colin

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using crypto++ with boost::wserialization
by Sean Farrow 04 Jul '11

04 Jul '11

Hi: I'm in the process of needing to encrypt a stream that I'm serializing to. Given that I'm using boost::wserialization to serialize classes, what is the best way of going about this, writing two separate streams to do the job, or writing stream filters? Fyi I'm planning on using Crypto++ has anybody already got streams/stream buffers that use this library? If I can use both approaches, what are the differences? I need to make the code as easy to read as possible. Any help appreciated. Cheers Sean.

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Boost.Python to-Python converter for class T already registered
by Tyler Weston 04 Jul '11

04 Jul '11

Hi All, I'm integrating a Boost.Python module into a Django project. I'm getting spammed with warnings for duplicate conversion methods. Django uses a multi-process model that loads separate copies of the python module into memory. The module does fine with multiprocess initialization. The warnings occur when, somehow, Django calls __init__ a second time on my module, within the same process. The warnings look like: C:\work\svn\sw\branches\python\imager\__init__.py:1: RuntimeWarning: to-Python converter for class std::vector<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::allocator<class basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > > already registered; second conversion method ignored. I have a few questions about this, as I am new to python. I thought that modules were supposed to be process-global. How do i enforce this and prevent __init__ from being called twice? Are the warnings benign? Should I be concerned about the state of my library static globals (ie is the compiled code going through a second initialization process)?

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Re: [Boost-users] [chrono] Can not build with intel-win
by Edward Rankin 04 Jul '11

04 Jul '11

Message: 1 > Date: Sat, 2 Jul 2011 15:39:41 -0700 (PDT) > From: Vicente Botet <vicente.botet(a)wanadoo.fr> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] [chrono] Can not build with intel-win > Message-ID: <1309646381376-3641235.post(a)n4.nabble.com> > Content-Type: text/plain; charset=UTF-8 > > > Edward Rankin wrote: > > > >> > Message du 13/06/11 09:12 > >> > De : "Bo Jensen" > >> > A : boost-users <at> lists.boost.org > >> > Copie ? : > >> > Objet : [Boost-users] [chrono] Can not build with intel-win > >> > > >> > Newest intel C++ release and vs2010, can not build with chrono from > >> trunk. > >> > > >> > I get : > >> > > >> > pnet.cpp > >> > ..\..\..\external\boost\boost/chrono/duration.hpp(94): error: expected > >> > an expression > >> > && (boost::is_convertible ^ > >> > > >> > ..\..\..\external\boost\boost/chrono/duration.hpp(124): error: > >> > expected an expression > >> > && (boost::is_convertible ^ > >> > > >> > compilation aborted for ..\network\pnet.cpp (code 2) > >> > > >> > call "C:\Program Files > >> > (x86)\Intel\ComposerXE-2011\bin\intel64//iclvars.bat" > nul > >> > icl @"bin\intel-win\release\threading-multi\pnet.obj.rsp" > >> > > >> > Any suggestions welcome. > >> > >> Hi, > >> > >> I have no idea of what could be the cause of the error. > >> > >> Please could you try adding the namespace boost to common_type and send > >> me the preprocesed output. > >> > >> Thanks, > >> Vicente > >> > >> > > Hi, > > > > I tried adding the namespace boost to common_type on L93,L95,L123 and > L125 > > but the exact same error appears. Any other ideas? > > > > > > Hi, > > It seems that this compiler version doesn't likes the default bool template > initialization with &&. > > Could you try if naming the parameter change something? > If not could you try to move the default initialization of bool at the > template instantiation (line 110)? > > Hoping this time is better, > Vicente > > -- > View this message in context: > http://boost.2283326.n4.nabble.com/Re-chrono-Can-not-build-with-intel-win-t… > Sent from the Boost - Users mailing list archive at Nabble.com. > > Assuming I did it correctly, neither suggestion worked (exact same error message). It does look like Intel doesn't support the && when used in a template initialization. Are you able to propose any other workaround? I will see if I can come up with a simple case where Visual Studio works but Intel doesn't work so that I can post it on Intel Premier support, but a fix for this will take months to appear in a release. Regards, Edward

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[graph] Having multiple BFS visitors
by Maxime van Noppen 04 Jul '11

04 Jul '11

Hi, I'm trying to have multiple visitors in the BFS algorithm, thus mixing two examples provided by the doc: http://www.boost.org/doc/libs/1_46_1/libs/graph/example/bfs-example.cpp and http://www.boost.org/doc/libs/1_46_1/libs/graph/doc/bfs_visitor.html What I have: ---------------------------------------------------------------------- #include <boost/graph/adjacency_list.hpp> #include <boost/graph/breadth_first_search.hpp> #include <iostream> enum { r, s, t, u, v, w, x, y, N }; const char *name = "rstuvwxy"; using namespace boost; class discover_visitor : public default_bfs_visitor { public: template < typename Vertex, typename Graph > void discover_vertex(Vertex u, const Graph & g) const { std::cout << "discover: " << name[u] << std::endl; } }; int main() { typedef adjacency_list < vecS, vecS, undirectedS > graph_t; graph_t g; boost::add_vertex(g); boost::add_vertex(g); boost::add_vertex(g); boost::add_vertex(g); boost::add_vertex(g); boost::add_edge(r, s, g); boost::add_edge(s, u, g); boost::add_edge(t, v, g); std::vector<double> dist(N); discover_visitor vis; breadth_first_search(g, vertex(s, g), boost::visitor( make_bfs_visitor( std::make_pair(record_distances(&dist[0], on_tree_edge()), vis) ) ) ); return EXIT_SUCCESS; } ---------------------------------------------------------------------- This produces a lot of g++ errors such as: > /usr/include/boost/graph/breadth_first_search.hpp:311:5: instantiated from ‘void boost::breadth_first_search(const VertexListGraph&, typename boost::graph_traits<Graph>::vertex_descriptor, const boost::bgl_named_params<P, T, R>&) [with VertexListGraph = boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS>, P = boost::bfs_visitor<std::pair<boost::distance_recorder<double*, boost::on_tree_edge>, discover_visitor> >, T = boost::graph_visitor_t, R = boost::no_property, typename boost::graph_traits<Graph>::vertex_descriptor = long unsigned int]’ > bfs.cc:49:24: instantiated from here > /usr/include/boost/graph/visitors.hpp:138:44: error: no type named ‘event_filter’ in ‘class discover_visitor’ > /usr/include/boost/graph/visitors.hpp:139:51: error: no type named ‘event_filter’ in ‘class discover_visitor’ The problem seems to come from the 2nd pair argument 'vis'. It compiles if I repeat the first argument of the pair two times, ie: std::make_pair(record_distances(&dist[0], on_tree_edge()), record_distances(&dist[0], on_tree_edge())) I tried to define an 'event_filter' in my visitor class: typedef on_discover_vertex event_filter; But then I get other g++ errors: > /usr/include/boost/graph/visitors.hpp:109:8: error: no match for call to ‘(discover_visitor) (long unsigned int&, const boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS>&)’ Is it possible to have self-defined visitors in an EventVisitorList? And if so, how? I'm using boost 1.46.1 with g++ 4.6. Thanks! -- Maxime

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[interprocess] Is that possible that a desktop application open a message queue that a windows service create?
by 陈涛 04 Jul '11

04 Jul '11

I get the exception message "access denied"(interprocess_exception) when openning a message queue that a windows service created in a desktop application, the error code is "security error". Is that possible that a desktop application open a message queue that a service create? If not, I would drop the use of the message queue in my application.

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building and installing boost_log/1.0 on windows
by Shah, Gaurav N 04 Jul '11

04 Jul '11

Hi, I have downloaded boost_log/1.0 from svn. But I do not see any library files. I have never compiled boost libraries earlied. Can some one please guide me to build boost_log? Thank You, Gaurav This communication is for informational purposes only. It is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction. All market prices, data and other information are not warranted as to completeness or accuracy and are subject to change without notice. Any comments or statements made herein do not necessarily reflect those of JPMorgan Chase & Co., its subsidiaries and affiliates. This transmission may contain information that is privileged, confidential, legally privileged, and/or exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information contained herein (including any reliance thereon) is STRICTLY PROHIBITED. Although this transmission and any attachments are believed to be free of any virus or other defect that might affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by JPMorgan Chase & Co., its subsidiaries and affiliates, as applicable, for any loss or damage arising in any way from its use. If you received this transmission in error, please immediately contact the sender and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. Please refer to http://www.jpmorgan.com/pages/disclosures for disclosures relating to European legal entities.

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How & when to use weak_ptr
by doug livesey 03 Jul '11

03 Jul '11

Hi -- I'm loving how easy shared_ptr makes object handling, but am not sure about how to use weak_ptr. Should I use it in places where previously I would have, say, returned a const reference? For example: struct MyClass { const OtherObject & other_object() const; }; Would become: struct MyClass { weak_ptr<const OtherObject> other_object() const; }; Or is this wasteful, having weak_ptrs construct from shared_ptrs every time I want to access an member object? Or have I missed the point completely? ;) One convention I thought I might adopt would be like this: struct MyClass { void set_other_object( shared_ptr<OtherObject> ); // setter weak_ptr<OtherObject> get_other_object(); // non-const getter const OtherObject & other_object() const; // const getter }; Of course, that could be all kinds of dumb for all kinds of reasons I don't know about. :) Cheers, Doug.

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[numeric::convert] RoundNearest?
by Diederick C. Niehorster 03 Jul '11

03 Jul '11

Dear All, I have just discovered Boost.NumericConvert, useful and a nice effort! However, I am missing a RoundNearest function for float to int conversions, with only RoundEven being provided. RoundEven of course does exactly what it is described to do, rounding .5 to 0 and 1.5 to 2, but i'd like the highschool (usual?) behavior of rounding up when a number exactly in the middle is provided. I can implement it myself by slightly modifying RoundEven of course, but I am wondering if I am missing something obvious or whether there is a good reason why this function is not included? Thank you very much for any thoughts! Best, Dee

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Re: [Boost-users] [chrono] Can not build with intel-win
by Edward Rankin 02 Jul '11

02 Jul '11

> > Message du 13/06/11 09:12 > > De : "Bo Jensen" > > A : boost-users <at> lists.boost.org > > Copie à : > > Objet : [Boost-users] [chrono] Can not build with intel-win > > > > Newest intel C++ release and vs2010, can not build with chrono from trunk. > > > > I get : > > > > pnet.cpp > > ..\..\..\external\boost\boost/chrono/duration.hpp(94): error: expected > > an expression > > && (boost::is_convertible ^ > > > > ..\..\..\external\boost\boost/chrono/duration.hpp(124): error: > > expected an expression > > && (boost::is_convertible ^ > > > > compilation aborted for ..\network\pnet.cpp (code 2) > > > > call "C:\Program Files > > (x86)\Intel\ComposerXE-2011\bin\intel64//iclvars.bat" > nul > > icl @"bin\intel-win\release\threading-multi\pnet.obj.rsp" > > > > Any suggestions welcome. > > Hi, > > I have no idea of what could be the cause of the error. > > Please could you try adding the namespace boost to common_type and send me the preprocesed output. > > Thanks, > Vicente > > Hi, I tried adding the namespace boost to common_type on L93,L95,L123 and L125 but the exact same error appears. Any other ideas? Thanks, Edward

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Using boost function with virtual methods
by przemyslaw.sliwa＠uk.bnpparibas.com 02 Jul '11

02 Jul '11

Hi, I have a simple inheritance: class A {}; class RegressionTestScenario; typedef A CurveGen; typedef boost::shared_ptr<CurveGen> CurveGenPtr; typedef boost::function<void (RegressionTestScenario*, const std::string &)> actionFuntion; typedef boost::shared_ptr<actionFuntion> actionFuntionPtr; class RegressionTestScenario { public: virtual ~RegressionTestScenario() {} virtual void doScenario() = 0; virtual boost::shared_ptr<std::string> fileName() const = 0; virtual boost::shared_ptr<std::string> print() const = 0; virtual void unwrapPackage(const std::string &contents) = 0; protected: typedef std::vector<std::pair<actionFuntionPtr, std::string> > actionCollection; actionCollection m_actionCollection; }; class CurveGenRegressionTestScenario : public RegressionTestScenario { public: virtual void doScenario(); virtual boost::shared_ptr<std::string> fileName() const; virtual boost::shared_ptr<std::string> print() const; virtual void unwrapPackage(const std::string &contents); private: CurveGenPtr m_curveGenPtr; void addAction(const std::string &action); void changeBaseDate(const std::string &argument); void changeStvParameter(const std::string &argument); void changeLtvParameter(const std::string &argument); void changeHalfLife(const std::string &argument); void changeParameterSet(const std::string &argument); void changeCurrencyCouple(const std::string &argument); }; and I am trying to use the following: actionFuntion funPtr; if(params[0]=="BaseDate") funPtr = &CurveGenRegressionTestScenario::changeBaseDate; but it fails. I have no idea why. Could someone give me a hint? This is the output from the compiler: Cheers 1>------ Build started: Project: compare, Configuration: Release Win32 ------ 1>Compiling... 1>RegressionTestMain.cpp 1>D:\Dev\SOHO_NEW\Thirdparty\boost/bind/mem_fn_template.hpp(156) : error C2440: 'newline' : cannot convert from 'RegressionTestScenario *' to 'CurveGenRegressionTestScenario *' 1> Cast from base to derived requires dynamic_cast or static_cast 1> D:\Dev\SOHO_NEW\Thirdparty\boost/bind/mem_fn_template.hpp(171) : see reference to function template instantiation 'R boost::_mfi::mf1<R,T,A1>::call<U,const std::string>(U &,const void *,B1 &) const' being compiled 1> with 1> [ 1> R=void, 1> T=CurveGenRegressionTestScenario, 1> A1=const std::string &, 1> U=RegressionTestScenario *, 1> B1=const std::string 1> ] 1> D:\Dev\SOHO_NEW\Thirdparty\boost/function/function_template.hpp(225) : see reference to function template instantiation 'R boost::_mfi::mf1<R,T,A1>::operator ()<T0>(U &,A1) const' being compiled 1> with 1> [ 1> R=void, 1> T=CurveGenRegressionTestScenario, 1> A1=const std::string &, 1> T0=RegressionTestScenario *, 1> U=RegressionTestScenario * 1> ] 1> D:\Dev\SOHO_NEW\Thirdparty\boost/function/function_template.hpp(222) : while compiling class template member function 'void boost::detail::function::function_void_mem_invoker2<MemberPtr,R,T0,T1>::invoke(boost::detail::function::function_buffer &,T0,T1)' 1> with 1> [ 1> MemberPtr=void (__thiscall CurveGenRegressionTestScenario::* )(const std::string &), 1> R=void, 1> T0=RegressionTestScenario *, 1> T1=const std::basic_string<char,std::char_traits<char>,std::allocator<char>> & 1> ] 1> D:\Dev\SOHO_NEW\Thirdparty\boost/function/function_template.hpp(913) : see reference to class template instantiation 'boost::detail::function::function_void_mem_invoker2<MemberPtr,R,T0,T1>' being compiled 1> with 1> [ 1> MemberPtr=void (__thiscall CurveGenRegressionTestScenario::* )(const std::string &), 1> R=void, 1> T0=RegressionTestScenario *, 1> T1=const std::basic_string<char,std::char_traits<char>,std::allocator<char>> & 1> ] 1> D:\Dev\SOHO_NEW\Thirdparty\boost/function/function_template.hpp(722) : see reference to function template instantiation 'void boost::function2<R,T0,T1>::assign_to<Functor>(Functor)' being compiled 1> with 1> [ 1> R=void, 1> T0=RegressionTestScenario *, 1> T1=const std::basic_string<char,std::char_traits<char>,std::allocator<char>> &, 1> Functor=void (__thiscall CurveGenRegressionTestScenario::* )(const std::string &) 1> ] 1> D:\Dev\SOHO_NEW\Thirdparty\boost/function/function_template.hpp(1065) : see reference to function template instantiation 'boost::function2<R,T0,T1>::function2<void(__thiscall CurveGenRegressionTestScenario::* )(const std::string &)>(Functor,int)' being compiled 1> with 1> [ 1> R=void, 1> T0=RegressionTestScenario *, 1> T1=const std::basic_string<char,std::char_traits<char>,std::allocator<char>> &, 1> Functor=void (__thiscall CurveGenRegressionTestScenario::* )(const std::string &) 1> ] 1> D:\Dev\SOHO_NEW\Thirdparty\boost/function/function_template.hpp(1105) : see reference to function template instantiation 'boost::function<Signature>::function<void(__thiscall CurveGenRegressionTestScenario::* )(const std::string &)>(Functor,int)' being compiled 1> with 1> [ 1> Signature=void (RegressionTestScenario *,const std::string &), 1> Functor=void (__thiscall CurveGenRegressionTestScenario::* )(const std::string &) 1> ] 1> .\RegressionTestMain.cpp(182) : see reference to function template instantiation 'boost::function<Signature> &boost::function<Signature>::operator =<void(__thiscall CurveGenRegressionTestScenario::* )(const std::string &)>(Functor)' being compiled 1> with 1> [ 1> Signature=void (RegressionTestScenario *,const std::string &), 1> Functor=void (__thiscall CurveGenRegressionTestScenario::* )(const std::string &) 1> ] 1>D:\Dev\SOHO_NEW\Thirdparty\boost/bind/mem_fn_template.hpp(156) : error C2647: '->*' : cannot dereference a 'void (__thiscall CurveGenRegressionTestScenario::* const )(A1)' on a 'RegressionTestScenario *' 1> with 1> [ 1> A1=const std::string & 1> ] 1>Build log was saved at "file://d:\Dev\OwnProgs\compare\compare\Release\BuildLog.htm" 1>compare - 2 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== ___________________________________________________________ This e-mail may contain confidential and/or privileged information. 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boost::serializable | Persisting a shared_ptr to XML archive
by doug livesey 02 Jul '11

02 Jul '11

Hi -- I'm trying to serialize an object in a boost::shared_ptr, here: https://github.com/biot023/cell_biots/blob/master/include/game.h#L30 My problem is that the object isn't getting persisted, only the shared_ptr (I think). The result of this save is this: https://gist.github.com/1061413 Can anyone advise me on what I'm doing wrong? I've included <boost/serialization/shared_ptr.hpp>, but I guess there's something else I need to be doing. Any & all help very gratefully received, Doug.

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Re: [Boost-users] [review][assign] Formal review of Assign v2 ongoing
by er 02 Jul '11

02 Jul '11

This was posted to lib.boost.devel, but I meant to post it in boost.user as well: > About your other comments: > - operator| has a similar meaning in Boost.Range under adaptors. > - Feel free to suggest another prefix than 'do'. > - Dot is borrowed from Boost.Assign (1.0). Did you mean dot or %? The dot is a small price to pay for alternating between various ways to insert elements in a container, within one statement: put( cont )( x, y, z ).for_each( range1 )( a, b ).for_each( range2 ); The answer to "[Is it] just a quest to type less when using standard containers?" is yes, as illustrated just above, but it is quite a broad definition of standard containers. Version 2.0 provides macros to broaden it further (which was used to support Boost.MultiArray, for example). As for why such a library should exist, it depends on the degree to which you value the syntax above, which is very similar to Boost.Assign (1.0), in this case. You say "I ordinarily only initialize containers to literals when writing unit tests.". In this case, I think you are right that you can't beat C++0x initializer lists. But, you still may need to fill a container, as above. And also, consider the cases below: #include <vector> #include <queue> #include <string> #include <tuple> #include <boost/assign/v2/include/csv_deque_ext.hpp> int main() { typedef std::string s_; { typedef std::tuple<s_, int> t_; typedef std::vector<t_> v_; v_ v1 = { t_( "a", 1 ), t_( "b", 2 ), t_( "c", 3 ), t_( "d", 4 ), t_( "e", 5 ) }; using namespace boost::assign::v2; v_ v2 = converter( csv_deque<t_, 2>( "a", 1, "b", 2, "c", 3, "d", 4, "e", 5) ); } { typedef std::queue<int> q_; // Not aware that an initializer list works here using namespace boost::assign::v2; q_ q = converter( csv_deque<int, 1>( 1, 2, 3, 4, 5 ) ); } return 0; } > - Prefix _ is reserved for const objects (not sure the proper word for it) And I think this convention appears elsewhere in Boost, such as Boost.Parameter. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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Overloading boost::hash_value GCC
by André Santee 01 Jul '11

01 Jul '11

I'm having a hard time trying to compile my code here. What I'm doing is to overload the boost::hash_value function to use boost::unordered_map with a custom Vector2 class. My code: // Vector2 hash function namespace boost { inline std::size_t hash_value(Vector2 const& p) { std::size_t seed = 0; boost::hash_combine(seed, p.x); boost::hash_combine(seed, p.y); return seed; } } // namepace boost boost::unordered_map<Vector2, EntityList, boost::hash<Vector2> > buckets;[/code] It compiles and run fine on msvc 9.0 but gcc says the function does not exist (it looks like to me that it does exist!). error message: Compile++ thumb : Application <= BucketManager.cpp In file included from /boost/functional/hash/hash.hpp:510, from /boost/functional/hash.hpp:6, from /boost/unordered/unordered_map.hpp:17, from BucketManager.h:35, from BucketManager.cpp:24: /boost/functional/hash/extensions.hpp: In member function 'size_t boost::hash<T>::operator()(const T&) const [with T = math::Vector2]': /boost/unordered/detail/unique.hpp:183: instantiated from 'typename boost::unordered_detail::hash_unique_table<T>::value_type& boost::unordered_detail::hash_unique_table<T>::operator[](const typename T::key_type&) [with T = boost::unordered_detail::map<math::Vector2, boost::hash<math::Vector2>, std::equal_to<math::Vector2>, std::allocator<std::pair<const math::Vector2, std::list<RenderEntity*> > > >]' /boost/unordered/unordered_map.hpp:406: instantiated from 'T& boost::unordered_map<K, T, H, P, A>::operator[](const K&) [with K = math::Vector2, T = std::list<RenderEntity*>, H = boost::hash<math::Vector2>, P = std::equal_to<math::Vector2>, A = std::allocator<std::pair<const math::Vector2, std::list<RenderEntity*> > >]' BucketManager.cpp:128: instantiated from here /boost/functional/hash/extensions.hpp:176: error: no matching function for call to 'hash_value(const math::Vector2&)' /boost/functional/hash/hash.hpp:136: note: candidates are: size_t boost::hash_value(bool) /boost/functional/hash/hash.hpp:141: note: size_t boost::hash_value(char) /boost/functional/hash/hash.hpp:146: note: size_t boost::hash_value(unsigned char) /boost/functional/hash/hash.hpp:151: note: size_t boost::hash_value(signed char) /boost/functional/hash/hash.hpp:156: note: size_t boost::hash_value(short int) /boost/functional/hash/hash.hpp:161: note: size_t boost::hash_value(short unsigned int) /boost/functional/hash/hash.hpp:166: note: size_t boost::hash_value(int) /boost/functional/hash/hash.hpp:171: note: size_t boost::hash_value(unsigned int) /boost/functional/hash/hash.hpp:176: note: size_t boost::hash_value(long int) /boost/functional/hash/hash.hpp:181: note: size_t boost::hash_value(long unsigned int) /boost/functional/hash/hash.hpp:187: note: size_t boost::hash_value(wchar_t) /boost/functional/hash/hash.hpp:194: note: size_t boost::hash_value(boost::long_long_type) /boost/functional/hash/hash.hpp:199: note: size_t boost::hash_value(boost::ulong_long_type) /boost/functional/hash/hash.hpp:313: note: size_t boost::hash_value(float) /boost/functional/hash/hash.hpp:318: note: size_t boost::hash_value(double) /boost/functional/hash/hash.hpp:323: note: size_t boost::hash_value(long double) make: *** -- André Santee | Desenvolvedor de games andre.santee(a)jera.com.br | +55 67 8127-9528 [image: Facebook]<http://www.facebook.com/pages/Jera-Software-Agil/127079757331746> [image: Facebook] <http://twitter.com/decosantee> [image: Flickr]<http://www.flickr.com/jerasoftware> [image: LinkEdin] <http://www.linkedin.com/companies/jera?trk=fc_badge> <http://www.jera.com.br/>

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problems on iterating over a fusion sequence
by Olaf Peter 01 Jul '11

01 Jul '11

Hi, in the example below, the loop runs forever. What is the reason for this? I'm using trunk 72818 Thanks, Olaf

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Fwd: boost bind
by candy.chiu.ad＠gmail.com 01 Jul '11

01 Jul '11

> Hi, > A boost::bind statement in my code generated the following compilation > error: > 1>Compiling... > 1>CmsPayOffReplication.cpp > 1>.\CmsPayOffReplication.cpp(79) : error C2665: 'boost::bind' : none of > the 2 overloads could convert all the argument types > 1> C:\DiskE\OpenSource\boost_1_45_0\boost/bind/bind.hpp(1420): could > be 'boost::_bi::bind_t > boost::bindarg,QuantLib::Date,QuantLib::Period,QuantLib::Period,QuantLib::Rate>(boost::type,F,A1,A2,A3,A4,A5)' > 1> with > 1> [ > 1> R=double, > 1> F=QuantLibInterface::YieldCurveUtility *, > 1> > L=boost::_bi::list5arg,boost::_bi::valueQuantLib::Date>,boost::_bi::value,boost::_bi::value,boost::_bi::valueRate>>, > 1> T=QuantLibInterface::YieldCurveUtility, > 1> I=1, > 1> A1=boost::arg, > 1> A2=QuantLib::Date, > 1> A3=QuantLib::Period, > 1> A4=QuantLib::Period, > 1> A5=QuantLib::Rate > 1> ] > 1> C:\DiskE\OpenSource\boost_1_45_0\boost/bind/bind.hpp(1512): > or 'boost::_bi::bind_t > boost::bindarg,QuantLib::Date,QuantLib::Period,QuantLib::Period,QuantLib::Rate>(F,A1,A2,A3,A4,A5,A6)' > 1> with > 1> [ > 1> R=boost::_bi::unspecified, > 1> F=double, > 1> L=boost::_bi::list6bi::valueYieldCurveUtility > *>,boost::arg,boost::_bi::value,boost::_bi::value,boost::_bi::valuePeriod>,boost::_bi::valueQuantLib::Rate>>, > 1> T=QuantLibInterface::YieldCurveUtility, > 1> I=1, > 1> A1=QuantLibInterface::YieldCurveUtility *, > 1> A2=boost::arg, > 1> A3=QuantLib::Date, > 1> A4=QuantLib::Period, > 1> A5=QuantLib::Period, > 1> A6=QuantLib::Rate > 1> ] > 1> while trying to match the argument list '(overloaded-function, > QuantLibInterface::YieldCurveUtility *, boost::arg, const QuantLib::Date, > const QuantLib::Period, const QuantLib::Period, QuantLib::Rate)' > 1> with > 1> [ > 1> I=1 > 1> ] > I replicated the set up of the objects in simpler project, and the bind > statement compiled successfully. Can anyone shred some light on the cause > of the error? > Here is how I call boost::bind > QuantLib::Date date; > QuantLib::Period p1,p2; > QuantLib::Rate rate; > // initialization of date, p1, p2, rate > boost::functionYieldTermStructure>) > > priceWithCurve = boost::bind( > &YieldCurveUtility::priceSwap, > &YieldCurveUtility::instance(), _1, > date, period1, period2, rate ); > Thank you.

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[Boost-log v1][Boost 1_46_1][MinGW 4.4.0][Windows 7] Finaly builded (partially) !!!
by Aman Feri 01 Jul '11

01 Jul '11

Hello I finally partially builded Boost_log v1 with Boost 1_46_1 using MinGW (gcc 4.4.0) on windows 7. It's a great victory for me, because it took a long time. I contribute here, if anyone need it or is able to make it work better. -------------- Error 1 -------------- Title : Compiling Boost_log v1 with Boost 1_46_1 including Filesystem v3 Symptom : error: 'external_string_type' is not a member of 'boost::filesystem3::wpath' Fix : using Filesystem_version 2 (thanks http://stackoverflow.com/questions/6076405/what-is-boost-log-how-to-get-it-… ) (don't forget to #define BOOST_FILESYSTEM_VERSION 2 in your projects using Boost_log) -------------- Error 2 -------------- Title : Using windows path Symptom : "windres.exe" + "C:\Program is not recognize as a valid command" (free translation) Fix : reinstalling MinGW, in a directory without space allowed bjam to find windres.exe -------------- Error 3 -------------- Title : (maybe a boost log v1 bug ?) Symptom : libs\log\src\event_log_backend.cpp:55: error: external linkage required for symbol 'boost::log_mt_nt5::sinks::event_log::success' because of 'dllexport' attribute Fix (seams to work, but confirmation still needed) : replace libs\log\src\event_log_backend.cpp line 55/56/57/58 from : BOOST_LOG_EXPORT const event_type_t ... to extern BOOST_LOG_EXPORT const event_type_t ... -------------- Error 4 -------------- Title : comeback of error 1 Symptom : Error 1 reproduce only on "release" build (but debug was build) Fix : no fix. Already spended 4 hours on this. I just use debug dll. Note : it implies i use debug dll for filesystem, system, thread and regex too (maybe implying i use both debug and release version in my final project) -------------- Error 5 -------------- Title : linking my project (the one that use boost log) with signle threaded instead of multi threaded Symptom : undefined reference to `boost::log_mt_nt5::basic_attribute_set<char>::~basic_attribute_set()' Fix : link your project using log v1 with libboost_log-mgw44-mt-d-1_46_1.dll not libboost_log-mgw44-d-1_46_1.dll (note the -d for "debug because i couldn't build the release cf error 4) Have a nice build !

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Problem with dijkstra_shortest_paths
by Stephen Woodbridge 01 Jul '11

01 Jul '11

Hi all, I am C programmer floundering in a C++ world! I have the function that I call from C that builds a graph, runs dijkstra_shortest_paths(), then extracts the results and passes them back to a C array of structs. Code is in pastebin: http://pastebin.com/xi7vLpTx This seems to work and everything looks ok, EXCEPT the edge ids are not correct. I suspect this is because I'm not doing something correctly and I have been messing with this for a couple weeks without success, so I think its time to ask for help. So in the function: graph_add_edge(G &graph, int id, int source, int target, float8 cost) id is the edge id source is the node id at the start of the edge target is the node_id at the end of the edge cost is the cost to traverse the edge from source to target I would really appreciate it if someone could look at this and point out what I might be doing wrong. Thanks in advance, -Steve

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Meta State Machine PseudoExit transitions
by Johan Gielens 01 Jul '11

01 Jul '11

Hello, I'm trying to implement a PseudoExitState in my boost meta state machine. This is the situation: http://i55.tinypic.com/2a83yar.png. Currently, when going from Transport to either Situation A or B, it throws an "no_transition" in the SubState for the "convertible event" needed by the PseudoExit state. (This is event6 in the example described below) According to the documentation (http://www.boost.org/doc/libs/1_46_1/libs/msm/doc/HTML/ch03s02.html#d0e930) and the corresponding example, there should be some kind of transition triggered by "event6" from SubState2 to Substate1 (see http://www.boost.org/doc/libs/1_46_1/libs/msm/doc/HTML/examples/DirectEntry…, in the transition table for SubFsm2). I don't see an arrow in the state diagram between SubState2 and SubState1, nor can I figure out why I would want such a transition. In my SubState's transition table, I have defined the transition from Transport to PseudoExit1 and 2: g_row< Transport , Sensor , Exit1 , &SubFront::SDownstreamCheck >, g_row< Transport , Sensor , Exit2 , &SubFront::SDownstreamNoCheck > and in the TopState from PseudoExit1 and 2 to SituationA and B: _row< Sub::exit_pt< SubFront::Exit1 > , TransportDone , SituationA >, _row< Sub::exit_pt< SubFront::Exit2 > , TransportDone , SituationB >, So do i have to handle an "TransportDone" event in the SubState? And what are my Start and End states? I would appreciate your help :) Best Regards, Johan

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Re: [Boost-users] Boost-users Digest, Vol 2769, Issue 5
by Tom Tan 01 Jul '11

01 Jul '11

------------------------------ > > Date: Thu, 30 Jun 2011 15:00:13 -0400 (EDT) > From: Jeremiah Willcock <jewillco(a)osl.iu.edu> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] [Graph]questions regarding > boost::graph::adjacency_list constructor prototype > > On Thu, 30 Jun 2011, Tan, Tom (Shanghai) wrote: > > > > > While studying boost.graph, I stumbled upon this constructor definition: > > > > ????template <class EdgeIterator> > > > > ??? adjacency_list(EdgeIterator first, EdgeIterator last, > > > > ????????????????????????? vertices_size_type n, > > > > ????????????????????????? edges_size_type = 0, > > > > ????????????????????????? const GraphProperty& p = GraphProperty()) > > > > ????? : Base(n, first, last), m_property(new graph_property_type(p)) > > > > { } > > > > I have 2 questions here: > > > > -????????? What does ?edges_size_type = 0,? means here?? Assigning a value to a TYPE, instead of a parameter? Can > > anyone please point me to an explanation of this grammar usage? > > It's like if the code was "edges_size_type x = 0", but since the parameter > is not used, removing the name avoids compiler warnings. Nice to know this trick. Never knew that the 'x' can be omitted in this case. > > > > > -????????? Why the necessary of edges_size_type = 0 parameter,? since there?s a range pair of ?EdgeIterator first, > > EdgeIterator last?? > > It is not necessary, since the value of that parameter is never used. It > is probably there match the interface of some other constructor, either in > adjacency_list or some other graph class. I guessed so but it's better to confirmed. Thanks for the help. -Tom

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[Range] Select forward or reverse traversal at compile time?
by Alastair Rankine 01 Jul '11

01 Jul '11

Given a bidirectional range R, is it possible to select at compile time whether we want to iterate forwards or backwards? Below is a test app. At the commented line, I would like to transparently construct a forward or reverse range, ie either [begin(range), end(range)] or [rbegin(range), rend(range)] respectively, depending on the definition of the Reversed template parameter. Just to be clear, the desired output is: forward: abc reversed: abc I can make this work by using a functor class with partial specialisation to construct the iterator_range, using begin/end or rbegin/rend respectively. But it's a bit ugly and it would seem like something that boost range would provide anyway? (Note that boost::reverse() is NOT what I am after.) #include <boost/assign/list_of.hpp> #include <boost/range/algorithm/copy.hpp> #include <boost/range.hpp> #include <vector> #include <iostream> template <typename Reversed, typename Range> std::string Print(const Range& range) { typedef boost::iterator_range< typename boost::mpl::eval_if< Reversed, boost::range_reverse_iterator<const Range>, boost::range_iterator<const Range> >::type> IterRange; // want to convert it to a forward range here IterRange forwardRange(range); std::string result; boost::copy(forwardRange, std::back_inserter(result)); return result; } int main(int argc, char* argv[]) { using boost::assign::list_of; std::vector<char> a = list_of('a')('b')('c'); std::vector<char> b = list_of('c')('b')('a'); std::cout << "forward: " << Print<boost::mpl::false_>(a) << std::endl << "reversed: " << Print<boost::mpl::true_>(b) << std::endl; return 0; }

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