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C++11, boost::filesystem::path, no std::hash specialization
by Benjamin Kircher 05 Dec '12

05 Dec '12

Hi there, I cannot use boost::filesystem::path with an e.g. unordered_set because std::hash seems not to be specialized for this type. Is this intended? Should I file a bug? Or am I completely misguided? I use 1.52 libraries with -DBOOST_FILESYSTEM_NO_DEPRECATED. I searched the bug database but did not find anything relevant (other than this https://svn.boost.org/trac/boost/ticket/5650 ticket). Thanks in advance, -Benjamin

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Boost.Serialization type-dependent serialization
by Roman Suvorov 05 Dec '12

05 Dec '12

Hi! I have a list of objects of the following structure: > class Obj > { > // a number simple fields > int field1() const; > > // ... > > // reference to an object containing large amount of data > const blob_type & mega_blob() const; > }; The list is to be serialized in the following way: 1) simple fields of each object are to be serialized into a single xml file; 2) mega_blobs' are to be serialized into separate binary files. The idea of doing it is to write custom archive that has operator<< specialized for blob_type which does the magic. Following the Boost.Serialization reference (http://www.boost.org/doc/libs/1_52_0/libs/serialization/doc/archive_referen…) I wrote the code in order to proof the concept: http://pastebin.com/ekbXXvxF My test project is built using CMake and G++-4.6.3 (Debian Wheezy) (that seems to be ok - other code that uses Boost.Serialization compiles well): http://pastebin.com/WVRUKLD2 As a result I get the following linker errors: http://pastebin.com/rM05nkqw The questions: 1) am I using xml_oarchive_impl wrong way or that problem is not boost-related? 2) maybe there are more elegant ways of solving my task? Cheers, Suvorov Roman.

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Re: [Boost-users] Boost-users Digest, Vol 3288, Issue 1
by Shcherbina Vladimir 05 Dec '12

05 Dec '12

Hi, Could you try it with MS compiler and any release prior to the 1.52.0? -----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: 04 December 2012 17:29 To: boost-users(a)lists.boost.org Subject: Boost-users Digest, Vol 3288, Issue 1 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 1.49.0 compilation issue (Marshall Clow) 2. Re: boost msm - Multiple differed events (Kamel Zaarouri, Mr) 3. [serialization] versioning for class nested within template class (Gabriel Redner) 4. Re: Asio and software interrupts (Steve Lorimer) 5. Spirit guidance needed (Arkadiy and Marina Vertleyb) 6. [boost][polygon]Errors with minkowski sum (renaud lepere) 7. Re: Spirit guidance needed (Igor R) 8. Experience with dealing with warnings from the Clang toolset? (Paul A. Bristow) ---------------------------------------------------------------------- Message: 1 Date: Mon, 3 Dec 2012 09:29:59 -0800 From: Marshall Clow <mclow.lists(a)gmail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Boost 1.49.0 compilation issue Message-ID: <BA420D66-6A77-4CF9-AB4C-E1005A770684(a)gmail.com> Content-Type: text/plain; charset=us-ascii On Dec 2, 2012, at 1:47 AM, Shcherbina Vladimir <Vladimir.Shcherbina(a)elbitsystems.com> wrote: > I tried to compile this boost dependent class with VS2008 and VS2010 > (error lines are in bold) Another data point: I was able to successfully compile your code with clang. and the 1.52.0 release. -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki ------------------------------ Message: 2 Date: Mon, 3 Dec 2012 21:08:57 +0000 From: "Kamel Zaarouri, Mr" <kamel.zaarouri(a)mail.mcgill.ca> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: Re: [Boost-users] boost msm - Multiple differed events Message-ID: <E7E49CA8DA97024ABF8B81BBF85E325412D63A(a)EXMBX2010-3.campus.MCGILL.CA> Content-Type: text/plain; charset="us-ascii" Hi Guys, Let's say that we have 2 states, S1 and S2. with this transition table: S1 -> S2 on event Es2 S2 -> S1 on event Es1 also let's say that S1 can also accept Ev1 and Ev2 but S2 cannot accept them so it differs them. Now when let's say that S2 receives 2 events Ev1 and Ev2 and differs them. Now, when S2 goes back to S1 would S1 handle both events in order? or how does it work? Thanks, ------------------------------ Message: 3 Date: Mon, 3 Dec 2012 17:51:40 -0500 From: Gabriel Redner <gredner(a)gmail.com> To: boost-users <boost-users(a)lists.boost.org> Subject: [Boost-users] [serialization] versioning for class nested within template class Message-ID: <CAO0m-H+t-bfAOe7JoV27MEMeHPXs6pVzDV9yqJC1Csp2Av6ESA(a)mail.gmail.com> Content-Type: text/plain; charset=windows-1252 Hi folks, I am having trouble incrementing the serialization version of a regular class nested within a template class. I'm not sure if the problem is with boost or with my own understanding of the issue. My code looks like: ============================== template <typename A, typename B> struct Foo { struct Bar { int data1; int data2; private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, unsigned int version) { ar & data1; if (version >= 2) { ar & data2; } else { data2 = 0; } } }; }; ============================== My attempt at setting the version looks like: ============================== namespace boost { namespace serialization { template <typename A, typename B> struct version<typename Foo<A, B>::Bar> { BOOST_STATIC_CONSTANT(unsigned int, value = 2); }; } // namespace serialization } // namespace boost ============================== However, g++ gives an error: ============================== main.cpp:31:8: error: template parameters not used in partial specialization: main.cpp:31:8: error: ?A? main.cpp:31:8: error: ?B? ============================== Strangely, clang 3.0 compiles the code but issues some warnings: ============================== main.cpp:31:8: warning: class template partial specialization contains template parameters that can not be deduced; this partial specialization will never be used struct version<typename Foo<A, B>::Bar> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:30:20: note: non-deducible template parameter 'A' template <typename A, typename B> ^ main.cpp:30:32: note: non-deducible template parameter 'B' template <typename A, typename B> ^ 1 warning generated. ============================== I'd appreciate any pointers! Thanks, -Gabe ------------------------------ Message: 4 Date: Tue, 4 Dec 2012 10:17:33 +1100 From: Steve Lorimer <steve.lorimer(a)gmail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Asio and software interrupts Message-ID: <CAE-NPOiR0Z3rGhmfBftGxpRLrJHTBW=6eMjGac27SaW+OvgJVw(a)mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" On 4 December 2012 01:51, Joseph Sulewski <joemacher(a)gmail.com> wrote: > *When I call socket->bind I provide it with an endpoint. When I > create the endpoint I'm currently using the multicast address, what > should I use for the address? * > If you bind to INADDR_ANY then the OS will use its ip routing tables to work out which the best local nic to use is. You can force it to use a specific local nic by providing its address. Most applications will use INADDR_ANY *If I'm binding to multiple multicast addresses it doesn't make sense to > bind to one of them.* > Because UDP is connectionless there is no way for the kernel / network stack to know which pid to deliver datagrams to for a particular port unless you bind your socket's file descriptor to that port. (note, if you want to allow other file descriptors to be able to bind to that port you need to set SO_REUSEADDR to 1) > *Finally, it appears I can join multiple multicast groups but they > need to be the same port. Is this correct?* > The reason for this is as my previous point above. What you would do is create as many sockets as there are different ports, and have each socket join the multicast addresses which are on that port > >

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[Filesystem] Movable fstreams
by Szymon Gatner 04 Dec '12

04 Dec '12

Hi, Could move (via boost.move) support be added to file streams provided by filesystem library? Would be very useful when returning for example ifstream from function. Cheers, Simon -- Szymon Gatner The Lordz Games Studio www.thelordzgamesstudio.com

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Boost.Math - Statistical Distribution Explorer - updated to Boost 1.52
by Paul A. Bristow 04 Dec '12

04 Dec '12

Just to note that I have recently updated the Microsoft Windows C# 'app' that allows one to explore various properties of statistical distributions and calculate their Cumulative Distribution Function CDF, Probability Distribution Function PDF, or quantiles/percentiles. This revision includes some new distributions and all the bug fixes and improvements in Boost.Math for 1.52. I have also now aligned the application version numbering with Boost release numbering. For full information and download http://sourceforge.net/projects/distexplorer/ It works on all the 'this-millennium' versions of Windows. If anyone knows how to produce a *nix version, please contact me. Paul --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow(a)hetp.u-net.com

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Spirit guidance needed
by Arkadiy and Marina Vertleyb 04 Dec '12

04 Dec '12

Hi all, Can somebody direct me to a part/facility inside the Spirit library to do the following: I need to pre-parce a boolean expression (once) and save it somewhere. Then I need to evaluate this expression (many times, performance important) based on different values of tokens. Will Spirit.Classic do? Or do I need to use any of the newer libraries inside Spirit? Thanks for any help. Arkadiy

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[boost][polygon]Errors with minkowski sum
by renaud lepere 04 Dec '12

04 Dec '12

I need to implement robust minkowski sum operations on polygons. I have seen that this could be implemented easily using boost::polygon, the tutorial is here http://www.boost.org/doc/libs/1_52_0/libs/polygon/doc/gtl_minkowski_tutoria… The example works fine, however i need more precision than "int" (32 bits on my plateform win32-msvc10-32bits). I tried to replace to replace int -> double typedef boost::polygon::point_data< int > point; with typedef boost::polygon::point_data< double > point; But this leads to strange errors deep into the code (operator< is "bad") if (!_Pred(_Left, _Right)) return (false); else if (_Pred(_Right, _Left)) _DEBUG_ERROR2("invalid operator<", _File, _Line); called after scan_data_.insert(*insert_itr); // line 1197 in scan_arbitrary.hpp What can i do to avoid it, if i use "long long" type it works but it sends a lot of warning at compile time. Any idea of what i should do ? Is "double" type supported ?

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Asio and software interrupts
by Joseph Sulewski 03 Dec '12

03 Dec '12

Hello, I’m use the Boost::Asio libraries to read data from multicast sockets. This is a high rate application that needs to listen to data coming on a large number of multicast addresses (up to 500 different addresses). I would like to funnel all the multicast traffic to a single class where the data can get handled very quickly. I have the code working now using the socket->async_receive_from() method but the system is getting bogged down handling a large number of software interrupts. 51% of the CPU time is spent handling software interrupts. I create each multicast socket (up to 500 of them) like so: socket = new udp::socket(io_service); socket->open(listenEndPoint.protocol()); socket->set_option(boost::asio::ip::udp::socket::resuse_address(true)); socket->bind(listenEndPoint); socket->set_option(boost::asio::ip::multicast::join_group(multicastAddress.to_v4())); Slightly after that I register for data like so: socket->async_receive_from(buffer,senderEndPoint,boost::bind(&EthernetCapture::receiveData,this,boost::asio::placeholders::bytes_transferred)); Is there a more efficient way to receive multicast data without incurring so many software interrupts? By the way this is for an application to run on 32 bit Linux for an embedded application. Thanks

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[serialization] versioning for class nested within template class
by Gabriel Redner 03 Dec '12

03 Dec '12

Hi folks, I am having trouble incrementing the serialization version of a regular class nested within a template class. I'm not sure if the problem is with boost or with my own understanding of the issue. My code looks like: ============================== template <typename A, typename B> struct Foo { struct Bar { int data1; int data2; private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, unsigned int version) { ar & data1; if (version >= 2) { ar & data2; } else { data2 = 0; } } }; }; ============================== My attempt at setting the version looks like: ============================== namespace boost { namespace serialization { template <typename A, typename B> struct version<typename Foo<A, B>::Bar> { BOOST_STATIC_CONSTANT(unsigned int, value = 2); }; } // namespace serialization } // namespace boost ============================== However, g++ gives an error: ============================== main.cpp:31:8: error: template parameters not used in partial specialization: main.cpp:31:8: error: ‘A’ main.cpp:31:8: error: ‘B’ ============================== Strangely, clang 3.0 compiles the code but issues some warnings: ============================== main.cpp:31:8: warning: class template partial specialization contains template parameters that can not be deduced; this partial specialization will never be used struct version<typename Foo<A, B>::Bar> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:30:20: note: non-deducible template parameter 'A' template <typename A, typename B> ^ main.cpp:30:32: note: non-deducible template parameter 'B' template <typename A, typename B> ^ 1 warning generated. ============================== I'd appreciate any pointers! Thanks, -Gabe

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Re: [Boost-users] boost msm - Multiple differed events
by Kamel Zaarouri, Mr 03 Dec '12

03 Dec '12

Hi Guys, Let's say that we have 2 states, S1 and S2. with this transition table: S1 -> S2 on event Es2 S2 -> S1 on event Es1 also let's say that S1 can also accept Ev1 and Ev2 but S2 cannot accept them so it differs them. Now when let's say that S2 receives 2 events Ev1 and Ev2 and differs them. Now, when S2 goes back to S1 would S1 handle both events in order? or how does it work? Thanks,

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Boost 1.49.0 compilation issue
by Shcherbina Vladimir 03 Dec '12

03 Dec '12

2down votefavorite<http://stackoverflow.com/questions/13628685/boost-1-49-0-compilation-issue> I tried to compile this boost dependent class with VS2008 and VS2010 (error lines are in bold) #include <boost/interprocess/ipc/message_queue.hpp> #include <boost/interprocess/sync/scoped_lock.hpp> #include <boost/interprocess/sync/named_mutex.hpp> #include <boost/interprocess/sync/named_condition.hpp> struct SafeShardQueue { typedef boost::interprocess::scoped_lock<boost::interprocess::named_mutex> scoped_mutex; SafeShardQueue()//: { } ~SafeShardQueue() { remove(); } void wait_msg() { scoped_mutex locker(*mu); data_avail_condition->wait(locker); } void wait_space() { scoped_mutex locker(*mu); queue_empty_condition->wait(locker); } boost::shared_ptr<boost::interprocess::message_queue> msgs; boost::shared_ptr<boost::interprocess::named_condition> data_avail_condition; boost::shared_ptr<boost::interprocess::named_mutex> mu; boost::shared_ptr<boost::interprocess::named_condition> queue_empty_condition; static SafeShardQueue* open() { SafeShardQueue* tmp = new SafeShardQueue(); boost::interprocess::open_only_t open_create_type; tmp->msgs.reset(new boost::interprocess::message_queue (open_create_type, "message_queue")); tmp->mu.reset(new boost::interprocess::named_mutex(open_create_type, "shared_queue_mutex")); tmp->data_avail_condition .reset(new boost::interprocess::named_condition(open_create_type, "data_avail_condition")); tmp->queue_empty_condition .reset(new boost::interprocess::named_condition(open_create_type, "queue_empty_condition")); return tmp; } static SafeShardQueue* create() { remove(); SafeShardQueue* tmp = new SafeShardQueue(); boost::interprocess::create_only_t open_create_type; std::stringstream ss; try { tmp->msgs.reset(new boost::interprocess::message_queue(open_create_type, "message_queue", 256, 1024)); tmp->mu.reset(new boost::interprocess::named_mutex(open_create_type, "shared_queue_mutex")); tmp->data_avail_condition .reset(new boost::interprocess::named_condition(open_create_type, "data_avail_condition")); tmp->queue_empty_condition .reset(new boost::interprocess::named_condition(open_create_type, "queue_empty_condition")); } catch (const boost::interprocess::interprocess_exception& e) { ss << e.what(); } return tmp; } static void remove() { boost::interprocess::message_queue::remove("message_queue"); boost::interprocess::named_mutex::remove("shared_queue_mutex"); boost::interprocess::named_condition::remove("data_avail_condition"); boost::interprocess::named_condition::remove("queue_empty_condition"); } }; I got the following error message: 1>\boost\boost\interprocess\ipc\message_queue.hpp(254) : error C2039: 'priority_functor' : is not a member of 'boost::interprocess::ipcdetail::ipcdetail' 1>\boost\boost\interprocess\ipc\message_queue.hpp(425) : see reference to class template instantiation 'boost::interprocess::ipcdetail::mq_hdr_t<VoidPointer>' being compiled 1> with 1> [ 1> VoidPointer=boost::interprocess::offset_ptr<void> 1> ] 1>\boost\boost\interprocess\ipc\message_queue.hpp(425) : while compiling class template member function 'unsigned int boost::interprocess::message_queue_t<VoidPointer>::get_mem_size(unsigned int,unsigned int)' 1> with 1> [ 1> VoidPointer=boost::interprocess::offset_ptr<void> 1> ] 1>\boost\boost\interprocess\ipc\message_queue.hpp(465) : while compiling class template member function 'boost::interprocess::message_queue_t<VoidPointer>::message_queue_t(boost::interprocess::open_only_t,const char *)' 1> with 1> [ 1> VoidPointer=boost::interprocess::offset_ptr<void> 1> ] 1>\**sharedqueue.h(42)** : see reference to class template instantiation 'boost::interprocess::message_queue_t<VoidPointer>' being compiled 1> with 1> [ 1> VoidPointer=boost::interprocess::offset_ptr<void> 1> ] 1>\boost\boost\interprocess\ipc\message_queue.hpp(254) : error C2955: 'boost::interprocess::ipcdetail::priority_functor' : use of class template requires template argument list 1>\boost\boost\interprocess\ipc\message_queue.hpp(209) : see declaration of 'boost::interprocess::ipcdetail::priority_functor' 1>\boost\boost\interprocess\ipc\message_queue.hpp(254) : error C2143: syntax error : missing ',' before '<' It seems that you cannot use both interprocess::message_queue and interprocess:named_condition in the same class. Any ideas? I would greatly appreciate your help in this issue. Best Regards, Vladimir The information in this e-mail transmission contains proprietary and business sensitive information. Unauthorized interception of this e-mail may constitute a violation of law. If you are not the intended recipient, you are hereby notified that any review, dissemination, distribution or duplication of this communication is strictly prohibited. You are also asked to contact the sender by reply email and immediately destroy all copies of the original message.

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[Who's using boost?] Algocoders : books on c++11, Boost and Beyond
by Algocoders . 03 Dec '12

03 Dec '12

Algocoders <http://www.algocoders.com> Algocoders has been using boost since last 6+ years with a mission to help people build a better software eco-system by standing on the shoulder of giants. If it wasn't not for boost, then it could have been really difficult for us to build our framework based on sound mathematical foundation of computer science using modern C++. It is the pioneering efforts at boost towards "Using and Extending C++11, Boost and Beyond" which has motivated us to devote ourself in developing bullet-size capsules in the form of tiny booklets with industrial-set framework to lift the thin veil with initial focus on practical usage of C++11 vis-a-vis mathematical foundation behind it. Web Page : http://www.algocoders.com Enthused by boost, we are working tirelessly towards *publishing a series of books(or booklets) which will bridge the gap between esoteric and street-side ones. Initial focus will be on C++11, Boost, Loki, STL, Algorithms, Data Structures, Multi-threading, Design Patterns, gcc, clang, valgrind.* *First book in this series is :*(will be available by end of November 2012) *Foundation of Algorithms in C++11, Volume 1* Using and Extending C++11, Boost and BeyondList of books(in progress): - *C++11 Algorithms : *Using and Extending C++11, Boost and Beyond - *Smart Pointers** : Tips and Techniques in C++ :* Using and Extending C++11, Boost and Beyond - *C++11 FAQs :* Using and Extending C++11, Boost and Beyond - *Concepts & Traits C++ **:* Using and Extending C++11, Boost and Beyond and so on. We use almost all the libraries under boost including trunk and branches, especially Spirit, Phoenix, Proto, MPL, Fusion to mention a few. Thanks, Algocoders www.algocoders.com

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boost managed shared memory: RUN FAILED
by Olivier Austina 03 Dec '12

03 Dec '12

Hello, I try to run an example from this online book( http://en.highscore.de/cpp/boost/interprocesscommunication.html) and I got "RUN FAILED (exit value 1, total time: 938ms) ". I am using Netbeans. This is the example: #include <boost/interprocess/managed_shared_memory.hpp> #include <iostream> int main() { boost::interprocess::shared_memory_object::remove("Highscore"); boost::interprocess::managed_shared_memory managed_shm(boost::interprocess::open_or_create, "Highscore", 1024); int *i = managed_shm.construct<int>("Integer")(99); std::cout << *i << std::endl; std::pair<int*, std::size_t> p = managed_shm.find<int>("Integer"); if (p.first) std::cout << *p.first << std::endl; } Thanks very much. -- Regards Austina

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Serialization newbie, memory being overwritten?
by Lasse Laursen 03 Dec '12

03 Dec '12

Hello to you, I wonder if you might be able to solve this conundrum I've been pondering. The boost (1.51) serialization library is giving me some trouble. I've been battling back and forth with the library, and I'm beginning to think I'm missing some key element. At first, I had issues to just getting things written out to a file without crashes. As far as I could tell, this particular problem was compounded by the fact, that I tried to simplify my code by just writing a single primitive referenced by a pointer to an object containing said primitive. As I've since come to learn, serializing pointed-to primitives is apparently not trivial. I have since, gotten the serialization class to properly write out a few simple member primitives from my class, but when I read them back using the exact same function, it seems as though a lot - if not all - of the pre-existing data in the object, which I am not serializing, gets overwritten. As far as I have been able to tell from the tutorials, I am doing everything exactly by the book. I was also concerned that maybe boost doesn't allow partial serialization, but this shouldn't be an issue either as far as I can tell. I must be making some sort of colossal mistake that I just cannot see. My in and out code is fairly straight forward: std::string streamPath = PTMFilePath.string(); std::ifstream ifs(streamPath); boost::archive::xml_iarchive ia(ifs); ia >> BOOST_SERIALIZATION_NVP(aStream); ----- std::string streamPath = PTMFilePath.string(); std::ofstream ofs(streamPath); boost::archive::xml_oarchive oa(ofs); oa << BOOST_SERIALIZATION_NVP(aStream); ------ My serialization function: template<class Archive> void serialize(Archive &ar, const unsigned int file_version) { ar & BOOST_SERIALIZATION_NVP(nrOfSamples); } ------ aStream is a pointer to a custom class, where I have allowed boost access. I am really confused as to what is causing this. Both pointed to data and regular primitives in the aStream class are wiped/altered as soon as the program enteres the serialize function, and even before the actual data seems to be read. I must be overlooking something really basic here. I hope someone can whack me with the solution stick... Thanks, Lasse

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Incorrect assertion in Boost.Exception?
by Thorsten Dahlheimer 02 Dec '12

02 Dec '12

Hello, we want to use Boost.Exception (1.47.0) with MS Visual Studio 2010 in a project that consists of several DLLs and a main executable. We have situations where we store an error_info into an exception from inside a DLL and access it again from another DLL/the EXE, e.g.: dll.cpp: void func() { BOOST_THROW_EXCEPTION(my_exception() << my_info(42)); } exe.cpp: try { func(); } catch (boost::exception& e) { std::cout << *boost::get_error_info<my_info>(e) << std::endl; } Now at runtime, when the error info is accessed, the following assertion in boost::exception_detail::error_info_container_impl::get() fails: BOOST_ASSERT( BOOST_EXCEPTION_DYNAMIC_TYPEID(*p).type_==ti.type_ ); As far as we can see, this happens because MSVC++ uses seperate type_info objects in each dll/exe, and the above assertion compares pointers to type_infos instead of the objects themselves. We believe this is a bug on the Boost side, since type_info objects for the same type are generally not guaranteed to be unique. Are we correct with that? Thanks, Thorsten

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Re: [Boost-users] boost shared memory: vector of objets
by Olivier Austina 02 Dec '12

02 Dec '12

Hello, I am using gcc 4.5.3 and boost 1.48 ( Netbeans with Cygwin 4.x on Windows XP SP3). Thank you. Regards Austina -- Regards Austina

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boost shared memory vector objetc
by Olivier Austina 02 Dec '12

02 Dec '12

Hello, Please can somebody help me on this code (from boost site). I try to run it but I still get the following error: */cygdrive/C/Program Files/NetBeans 7.1.2/ide/bin/nativeexecution/dorun.sh: line 33: 12900 Segmentation fault (core dumped) sh "${SHFILE}" Press [Enter] to close the terminal ...* This is the code for creating vector in shared memory: #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/containers/vector.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <string> #include <cstdlib> //std::system using namespace boost::interprocess; //Define an STL compatible allocator of ints that allocates from the managed_shared_memory. //This allocator will allow placing containers in the segment typedef allocator<int, managed_shared_memory::segment_manager> ShmemAllocator; //Alias a vector that uses the previous STL-like allocator so that allocates //its values from the segment typedef vector<int, ShmemAllocator> MyVector; //Main function. For parent process argc == 1, for child process argc == 2 int main(int argc, char *argv[]) { if(argc == 1){ //Parent process //Remove shared memory on construction and destruction struct shm_remove { shm_remove() { shared_memory_object::remove("MySharedMemory"); } ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); } } remover; //Create a new segment with given name and size managed_shared_memory segment(create_only, "MySharedMemory", 65536); //Initialize shared memory STL-compatible allocator const ShmemAllocator alloc_inst (segment.get_segment_manager()); //Construct a vector named "MyVector" in shared memory with argument alloc_inst *MyVector *myvector = segment.construct<MyVector>("MyVector")(alloc_inst);* * ;* } else{ // some code } return 0; }; I got an error for this instruction: *MyVector *myvector = segment.construct<MyVector>("MyVector")(alloc_inst); *This addition information about the environnment: NetBeans 7.1.2 with Cygwin_4.x, gcc-core 3.4.4-999, gcc-g++ 3.4.4-999,gcc-mingw-core 20050522-3,gcc-mingw-g++ 20050522-3 ,gcc4-core 4.5.3-3 , gcc4-g++ 4.5.3-3 , gdb 7.5.50-1. I am using Windows XP SP3. Many thanks. -- Regards Austina

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Re: [Boost-users] Boost 1.49.0 compilation issue
by Shcherbina Vladimir 02 Dec '12

02 Dec '12

I tried to compile this code with Boost 1.46.1 and everything was OK! So, we have a problem with atleast 1.49 and up Vladimir The information in this e-mail transmission contains proprietary and business sensitive information. Unauthorized interception of this e-mail may constitute a violation of law. If you are not the intended recipient, you are hereby notified that any review, dissemination, distribution or duplication of this communication is strictly prohibited. You are also asked to contact the sender by reply email and immediately destroy all copies of the original message.

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Re: [Boost-users] [Range & c++0x Lambdas] Can this be done?
by John M. Dlugosz 01 Dec '12

01 Dec '12

I had the same issue and posted it a few months ago. I wrote to the MS VS forum that their std::result_of should work correctly with both old and new formats; in particular use the declared result_type if it exists (which in general lets the user override the deduced type, great for compatibility issues). Actually doing that robustly is a bit of a maze of metaprogramming. I ended up making a local my_namespace::result_of that I just handles what I needed, and only when I asked for it. That doesn't help the existing range templates, but such a change could be put back into boost::result_of. Meanwhile, for different reasons, I made a macro that abstracts the different syntax between C++11 lambdas and Apple Block Closures. The latter generates a suitable lambda class complete with result_of member. That makes me think that you could have a macro that wraps a compiler-generated lambda expression in another class that inherits the operator() etc. and adds in the result_of typedef to simply use decltype. —John Date: Wed, 21 Nov 2012 10:15:18 -0700 From: Nathan Crookston <nathan.crookston(a)gmail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] [Range & c++0x Lambdas] Can this be done? Message-ID: <CAMb0s=1qtLcOiXTd5h7b2qkOSiYqjEVeN-m=rafJRHKDU6y6Cg(a)mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" Rob, On Wed, Nov 21, 2012 at 6:39 AM, Robert Jones <robertgbjones(a)gmail.com>wrote: >> Can the last line, labelled NOT Ok, be made to work? I think the lambda >> does >> not publish its result as a bind does, so I suspect it's hopeless. Any >> thoughts? >> // NOT Ok >> boost::range::push_back( out, in | transformed( []( S & s ) { return >> s.i; } ) ); >> } >> >> It seems trivial to have a nested result_type in all cases with a lambda. > However, in C++11 there's no need for it due to decltype. > > Sadly, some compilers fall into a gap where result_of (boost or std) > doesn't use decltype and lambdas don't publish tr1-style result_type -- > leaving code like the above in the lurch. > > Michel Morin wrote some code for adapting such a case which may be of > interest to you: http://lists.boost.org/boost-users/2012/01/72879.php > > HTH, > Nate >

5 21

Boost.Wave getting raw input tokens for code transformation
by Frank Birbacher 30 Nov '12

30 Nov '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi! I'm trying to utilize Wave for simple code transformations. My starting point is to do an identity mapping through Wave: read in a source file, tokenize it, and output it again. The output shall be the same as the input on a byte by byte basis. I modified the cpp_lexer example to just output the token.value() texts. From that I discovered whitespace in "# define" will be dropped. Ok, fixed this by modifying Wave source code. Now my main problem are line continuations using backslash like in multiline macro definitions. Those get processed at a very low level, I guess. The backslash will never be reported as a token, but the adjacent characters will be fused into one token. Is there a way to define a "raw" token mode that would report the backslash and keep the adjacent characters as distinct tokens? I don't understand the tokenizer level at all. Frank -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: keyserver x-hkp://pool.sks-keyservers.net iEYEARECAAYFAlC1w/8ACgkQhAOUmAZhnmrUsQCeIVBxkYTUg1qIU2DTsSZuh5u1 2v8AniMF44HV4agBashrP81N6XN3bTW1 =A8Sp -----END PGP SIGNATURE-----

2 2

serialization of recursive objects
by kean 29 Nov '12

29 Nov '12

Hello everybody, I defined the following objects to be serialized: class MyElementObject { friend class boost::serialization::access; public: template<class Archive> void serialize(Archive & ar, const unsigned int version) { } }; template<class T> class MyRecursiveObject { friend class boost::serialization::access; public: T element; std::vector<MyRecursiveObject<T> > children; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & element; ar & children; } }; I then run the following code: int main() { //MyRecursiveObject initialization MyRecursiveObject<MyElementObject> rec_object; rec_object.children.push_back(MyRecursiveObject<MyElementObject>()); rec_object.children[0].children.push_back(MyRecursiveObject<MyElementObject>()); //create vector of pointers to MyRecursiveObject's elements vector<MyElementObject *> elt_ptrs; elt_ptrs.push_back(&rec_object.element); elt_ptrs.push_back(&rec_object.children[0].element); elt_ptrs.push_back(&rec_object.children[0].children[0].element); //serialize MyRecursiveObject and the vector of pointers { ofstream ofs("filename"); boost::archive::text_oarchive oa(ofs); oa << rec_object; oa << elt_ptrs; } //create new MyRecursiveObject and vector of pointers for deserialization MyRecursiveObject<MyElementObject> rec_object_deserialized; rec_object_deserialized.children.push_back(MyRecursiveObject<MyElementObject>()); rec_object_deserialized.children[0].children.push_back(MyRecursiveObject<MyElementObject>()); vector<MyElementObject *> elt_ptrs_deserialized; //deserialize { ifstream ifs("filename"); boost::archive::text_iarchive ia(ifs); ia >> rec_object_deserialized; ia >> elt_ptrs_deserialized; } //compare deserialized pointers cout<<"elt_ptrs first level="<<elt_ptrs_deserialized[0] <<" expected="<<&rec_object_deserialized.element<<endl; cout<<"elt_ptrs second level="<<elt_ptrs_deserialized[1] <<" expected="<<&rec_object_deserialized.children[0].element<<endl; cout<<"elt_ptrs third level="<<elt_ptrs_deserialized[2] <<" expected="<<&rec_object_deserialized.children[0].children[0].element<<endl; return 0; } And I always get an output similar to the following one: elt_ptrs first level=<b>0x7fff57c787c0* expected=*0x7fff57c787c0* elt_ptrs second level=*0x18e7020* expected=*0x18e7020* elt_ptrs third level=*0xffff8000ab5564f0* expected=*0x18e7450* As can be seen from the output I manage to deserialize pointers that point to elements down to the second recursion level of MyRecursiveObject. As soon as I try to do it with pointers to the third level or even deeper the deserialization fails. Am I using boost::serialization wrongly? Note that the MyRecursiveObject is always successfully deserialized, no matter how many levels it has. I encounter the problem only deserializing pointers to its elements. Thank you in advance Kean -- View this message in context: http://boost.2283326.n4.nabble.com/serialization-of-recursive-objects-tp463… Sent from the Boost - Users mailing list archive at Nabble.com.

2 1

Is it ok to pass &my_boost_array_variable[2] into a C function expecting a Type*
by Anton Daneyko 29 Nov '12

29 Nov '12

Hi, I have a two variables: boost::array my_boost_array_variable_1<float, 3>; boost::array my_boost_array_variable_2<float, 3>; now I want to call a C function with the following signature: int MPI_Allreduce ( void *sendbuf, void *recvbuf, ...); I want to pass the address of a particular element of my my_boost_array_variable_1 and my_boost_array_variable_2 as a first and second parameter of MPI_Allreduce: MPI_Allreduce(&my_boost_array_variable_1[2], &my_boost_array_variable_2[2], ... or should I rather do: MPI_Allreduce(my_boost_array_variable_1.c_array() + 2, my_boost_array_variable_2.c_array() + 2, ... Thanks, Anton

2 1

strange linkage problem with boost_date_time 1.52 (x86_64-linux-gnu/gcc version 4.7.2)
by mypop＠freenet.de 29 Nov '12

29 Nov '12

Hi erveryone, i have a little problem linking against my newly installed: boost_date_time library. I even don't know if this is the right place for this question because everything works fine so far in the past. 1. I never had problems compiling and linking this sources before (on 3 other systems). 2. The project also contains some other directories with some kind of commandline tools. These tools also link against the regex and date_time libraries without any problems. Here is the part where the libs are defined in my Makefile.am libmodwscmi_la_CXXFLAGS = $(INCLUDES) $(PROJECT_INCLUDES) $(APR_CFLAGS) libmodwscmi_la_LDFLAGS = $(LDADD) $(BOOST_LDFLAGS) $(LIB_BOOST_REGEX) $(LIB_BOOST_DATETIME) `$(APR1CONFIG) --link-ld --libs` libmodwscmi_la_LIBADD = $(top_builddir)/utils/mysqlpp/libmysqlpp.la $(top_builddir)/utils/jwsmtp/libjwsmtp.la After compiling is complete the linker gets called by this command: g++ -fPIC -DPIC -shared -nostdlib /usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.7/crtbeginS.o .libs/libmodwscmi_la-mod_wscmi.o .libs/libmodwscmi_la-mod_gsoap.o .libs/libmodwscmi_la-mod_utils.o .libs/libmodwscmi_la-mod_mysql.o .libs/libmodwscmi_la-md5.o .libs/libmodwscmi_la-regEx.o .libs/libmodwscmi_la-utils.o .libs/libmodwscmi_la-exception.o .libs/libmodwscmi_la-dateTime.o .libs/libmodwscmi_la-validator.o .libs/libmodwscmi_la-mysqlPool.o .libs/libmodwscmi_la-mysqlCons.o .libs/libmodwscmi_la-mysqlQueries.o .libs/libmodwscmi_la-sqlite3.o -Wl,-rpath -Wl,/var/www/projects/mod_wscmi-1.0/utils/mysqlpp/.libs -Wl,-rpath -Wl,/var/www/projects/mod_wscmi-1.0/utils/jwsmtp/.libs -L/usr/local/lib -lboost_date_time -lboost_regex -L/usr/lib /usr/lib/libapr-1.so -L/usr/local/mysql/lib ../utils/mysqlpp/.libs/libmysqlpp.so ../utils/jwsmtp/.libs/libjwsmtp.so -L/usr/lib/gcc/x86_64-linux-gnu/4.7 -L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../.. -lstdc++ -lm -lc -lgcc_s /usr/lib/gcc/x86_64-linux-gnu/4.7/crtendS.o /usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crtn.o -pthread -O3 -Wl,-R/usr/local/lib -pthread -Wl,-soname -Wl,libmodwscmi.so.0 -o .libs/libmodwscmi.so.0.0.0 As you can see above, both libraries are present: -lboost_date_time -lboost_regex. They also can be found on the harddrive (in /use/local/lib): ... -rw-r--r-- 1 root 136876 Nov 20 09:19 libboost_date_time.a lrwxrwxrwx 1 root 28 Nov 20 09:18 libboost_date_time.so -> libboost_date_time.so.1.52.0 -rwxr-xr-x 1 root 94337 Nov 20 09:18 libboost_date_time.so.1.52.0 ... -rw-r--r-- 1 root 2619610 Nov 20 09:19 libboost_regex.a lrwxrwxrwx 1 root 24 Nov 20 09:18 libboost_regex.so -> libboost_regex.so.1.52.0 -rwxr-xr-x 1 root 1251576 Nov 20 09:18 libboost_regex.so.1.52.0 ... The complete build runs fine! There are no errors or warnings but the fianlly library is unusable because: boost_date_time is not present. Ldd shows up something like this: ldd .libs/libmodwscmi.so.0.0.0 linux-vdso.so.1 => (0x00007fff17da4000) libboost_regex.so.1.52.0 => /usr/local/lib/libboost_regex.so.1.52.0 (0x00007ff289006000) libapr-1.so.0 => /usr/lib/libapr-1.so.0 (0x00007ff288db5000) libmysqlpp.so.0 => /var/www/projects/mod_wscmi-1.0/utils/mysqlpp/.libs/libmysqlpp.so.0 (0x00007ff288b35000) libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ff288832000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff288472000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ff28825c000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff28803f000) libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007ff287e39000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ff287c35000) libmysqlclient.so.18 => /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 (0x00007ff2876f1000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff2873f4000) /lib64/ld-linux-x86-64.so.2 (0x00007ff2895e9000) libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ff2871dd000) Only libboost_regex.so.1.52.0 was linked in and i have absolutly no idea why: libboost_date_time does not show up. So maybe someone of the list can give me an adivse of what's is going on here. Thanks and greetings Michael --- E-Mail ist da wo du bist! Jetzt mit freenetMail ganz bequem auch unterwegs E-Mails verschicken. Am besten gleich informieren unter http://mail.freenet.de/mobile-email/index.html

3 3

Fwd: [boost] [thread] Crash when calling pthread_cond_wait from thread.cpp in iOS simulator
by Brent Lewis 29 Nov '12

29 Nov '12

I've determined that pthread_cond_wait works fine on an iPhone (hardware) and works fine when called from my own module on simulator (I use boost::condition_variable, and since it's header only and calling pthread_cond_wait, it's my module) But when I create a new thread, which goes through thread.cpp in the thread library, call_once in once.hpp has to (sometimes, based on synchronization randomness) call pthread_cond_wait which results in the message: Detected an attempt to call a symbol in system libraries that is not present on the iPhone: (null) called from function _ZN5boost9call_onceIPFvvEEEvRNS_9once_flagET_ in image Blackjack If I make it continue, I get a problem report from OSX which tells me that the stack trace is: 0 libsystem_kernel.dylib 0x903a5a6a __pthread_kill + 10 1 libsystem_c.dylib 0x96afbacf pthread_kill + 101 2 libsystem_sim_c.dylib 0x03a0457b abort + 140 3 libSystem.dylib 0x032ad4ad _interposition_vtable_unimplemented + 200 4 libSystem.dylib 0x032c0938 pthread_cond_wait$UNIX2003 + 60 5 Blackjack 0x00277c8c void boost::call_once<void (*)()>(boost::once_flag&, void (*)()) + 156 (once.hpp:112) 6 Blackjack 0x0027506b thread_proxy + 139 (thread.cpp:135) 7 libsystem_c.dylib 0x96afa557 _pthread_start + 344 8 libsystem_c.dylib 0x96ae4cee thread_start + 34 Is it maybe some discrepancy in the settings I'm using to build boost that's causing to link something wrong... something else? I've attached the complete crash log. In case it is build related, this is how I've built boost using a shell script: LIBS=" --with-thread --with-serialization --with-date_time" CPLUS_INCLUDE_PATH=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/include/ PATH=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:$PATH ./b2 toolset=darwin runtime-link=static link=static variant=release include=$CPLUS_INCLUDE_PATH cxxflags=--visibility=default cxxflags=-Wno-long-long --build-dir=$HOME/boost/lib/build --includedir=$HOME/boost/include --libdir=$HOME/boost/lib/build/arm-release architecture=arm target-os=iphone $LIBS -q install

1 0

[counting_range] why?
by Robert Jones 28 Nov '12

28 Nov '12

Ok, maybe I'm having a senior moment here, but why is the second line wrong? Thx, Rob. #include <boost/range/counting_range.hpp> int main( ) { // Ok auto r = boost::counting_range( 0, 3 ); // Not Ok. auto s = boost::counting_range<int>( 0, 3 ); }

3 6

[graph] File Dependency Example with updates
by Brian Budge 28 Nov '12

28 Nov '12

Hi all - I am toying around with the file dependency example that is part of the boost graph documentation as a way of adapting the concepts to my own use cases. What I want to do is update the graph over time (add more files with more dependencies), and incrementally decide what needs to be built, and in what order. It makes sense that doing a breadth-first search from a changed node will give me everything that might be affected; however, if I change many nodes, is there something better? I could imagine that I might mark nodes as they are encountered so that other BFS from other changed nodes won't traverse those as well. With boost graph, how can I control the BFS to stop recursion if a vertex has already been visited? I guess then once I have seen all the stale vertices, I can make a smaller graph that only has the stale vertices and their connections, and I can topologically sort the sub-graph to find the parallel build order? Sorry, I'm a bit out of practice with my graph algorithms in general, and I'm very new to the boost graph library, so I hope I haven't said anything dumb :) Any design suggestions welcome. Thanks, Brian

2 6

Re: [Boost-users] [Who's using boost?] Algocoders : books on c++11, Boost and Beyond
by Erika James 27 Nov '12

27 Nov '12

On 28 November 2012 02:53, Algocoders . <algocoders(a)gmail.com> wrote: > > It is the pioneering efforts at boost towards "Using and Extending C++11, > Boost and Beyond" which has motivated us to devote ourself in developing > bullet-size capsules in the form of tiny booklets with industrial-set > framework to lift the thin veil with initial focus on practical usage of > C++11 vis-a-vis mathematical foundation behind it. > Wow, that's quite a mouthful! I read the excerpt of your first book on the website, and particularly enjoyed the final paragraph: *One thing was very much clear that, the naive looking interface* *was mere a rosy picture, hiding many unpleasant surprises in its bosom,* *which we thought of unfathoming it to its fullest. * I've never heard a C++ interface described as a bosom! I think you should rename the book to "Fifty shades of Boost"! ~Erika

1 0

[Review] Review results for Coroutines
by Hartmut Kaiser 24 Nov '12

24 Nov '12

All, The review for the Coroutines library written by Oliver Kowalke started September 3rd 2012, and ended on September 12th 2012. I counted 7 votes, none of which were NO. All authors votes YES, some made additional requests. Overall, the verdict of the community was clear: Oliver Kowalke's Coroutines library is ACCEPTED The discussion was lively and it touched on several points. Design ------ The Coroutines library offers enormous potential for programming regimes such as communications software and embedded systems design. Oliver selected a sensible granularity for his design. This granularity allows for fine-tuning the implementations of cooperative scheduling mechanisms while avoiding the prohibitively heavy weight of preemptive scheduling that is found in POSIX and often in implementations of the C++11 thread support library. In particular, the separation of Coroutines from Context allows for porting to other systems with minimal effort and maximum reliability and code re-use. Some suggestion related to the API have been made during the review, most of which (if not all) have already been addressed. Oliver has a full list of things and works on integrating the suggestions. Here is a short list: - allow to specify the allocator to use for memory allocations inside the library - remove 'self' pointer and replace with TLS - add symmetric coroutines API - better support for generator functionality Naming ------ Some of the people participating in the discussions suggested not to use the abbreviated 'namespace coro', but to use the full 'namespace coroutines' instead. This again is not a precondition for acceptance. Documentation ------------- The consensus of almost everybody referring to the documentation was that it is terse but readable and sufficient. People suggested to integrate the docs of the old Coroutines library (written as an GSoC project by Giovanni P. Deretta) into the documentation of the reviewed library. I would like to thank all who participated in the discussions. Regards Hartmut --------------- http://www.cct.lsu.edu/~hkaiser http://stellar.cct.lsu.edu http://boost-spirit.com

1 0

Re: [Boost-users] [Range & c++0x Lambdas] Can this be done?
by John M. Dlugosz 24 Nov '12

24 Nov '12

------------------------------ Message: 3 Date: Thu, 22 Nov 2012 11:31:05 -0800 From: "Jeffrey Lee Hellrung, Jr." <jeffrey.hellrung(a)gmail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] [Range & c++0x Lambdas] Can this be done? Message-ID: <CANvXPuQmePirYFadBKRyVoQur1N8DH2c-QhwqHgZMV2MNfG_gQ(a)mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" > Maybe this is what you did, so I might not be suggesting something new, > but... Perhaps boost::result_of could have an extra conditional logic > branch added to it: I don't recall the details, but I've learned that result_of has compatibility issues with old/new ways in general. So, if the "old way" is published at all, use it (for backward compatibility, in case it is different from what decltype would detect). This allows lamdas and other code that assumes decltype is being used, while preseving the behavior of code that explicitly publishes the type. > - If F::result_type exists, return F::result_type; > - Else: << same as before >> Meanwhile, for different reasons, I made a macro that abstracts the >> different syntax between C++11 lambdas and Apple Block Closures. The latter >> generates a suitable lambda class complete with result_of member. That >> makes me think that you could have a macro that wraps a compiler-generated >> lambda expression in another class that inherits the operator() etc. and >> adds in the result_of typedef to simply use decltype. >> > Wouldn't that require defining a class at expression scope? Is that > possible? > > - Jeff > Here's my docs on the matter: Given a macro M, at its simplest M can expand to either [=] or ^ depending on the platform, and then be followed by the optional lambda-declarator and compound-statement. However, Apple's Blocks do not have proper value semantics. You must call a function on it before leaving the scope where it was defined, if it is to be used outside of that scope. And then it needs to be explicitly destroyed when it is no longer needed. In order to use it transparently in C++, it needs to be wrapped in an object with a destructor, (and that wrapper can take care of the initial function call too). But we don't want to have to inject anything _after_ the compount-statement, or the macro syntax would be difficult, requiring either fully-bracketing macros or double parens around the whole thing. Meanwhile, the wrapper object needs to be templatized to provide the correct typed operator() forwarding function. My (JMD's) solution is to use an operator, which can take a second argument as trailing text without being wrapped in parens. That is, M would expand to dummy| ^ so that after the trailing text (not seen by the macro) you get: dummy| ^(ARGLIST){BLOCK} that is, the completed Apple Block Literal Expression becomes the second argument of the operator|, and my special object is the first argument. The operator| can be a template, and break open the Block type in the same manner as can be done for normal function pointer declarations. For wrapping a C++ lambda, reason is different (add the decltype) but you still return an instance of a class with the right stuff in it. The return value is a templated type, wrapper0<Ret>, wrapper1<Ret,A1>, or wrapper2<Ret,A1,A2> (etc) (an emulation of "..." for some fixed number of arguments) So, the _type_ is not unique, but reused for each time the same operator() is needed. The instance holds the underlying (wrapped) instance as a member. For Apple Blocks, that is just their variation on a function pointer, so the type goes with the signature. To wrap C++11 lamdas, the underlying instance has a unique type. So use _that_ as the template argument, and generate another unique type that you can inherit from. Using an operator| to add the wrapper, you can explicitly pull it in when needed along with any other filters that are being applied.

1 0

"cross-running" boost tests
by Gottlob Frege 23 Nov '12

23 Nov '12

I've managed to cross-compile boost for BlackBerry10 devices. (Side-note: there is very little docs on cross compiling) Now, how would I go about "cross-running" the boost tests? In particular, can I hook into the unit-test and/or run rules of Boost.Build? Given a command line, I can load and run it on device and then retrieve the results, I just need to know where to hook in. Tony

4 6

Re: [Boost-users] "cross-running" boost tests
by Lemay.Steve 23 Nov '12

23 Nov '12

Can you share how you succeeded a cross compiling the tests, I didn't have luck. - Sent via iPhone -----Original Message----- From: Gottlob Frege [gottlobfrege(a)gmail.com<mailto:gottlobfrege@gmail.com>] Sent: Thursday, November 22, 2012 12:28 PM Pacific Standard Time To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] "cross-running" boost tests That is along the right track. But I don't want to have to do that for every boost test file. This isn't for my own tests, I want to run the boost tests. I sort of need a global launcher that I can hook into. On Thu, Nov 22, 2012 at 1:40 PM, Paulo Márcio Figueiredo Alves <pauloalves1986(a)gmail.com<mailto:pauloalves1986@gmail.com>> wrote: You could use testing.launcher, like this: b2 testing.launcher=my_custom_launcher It'll call my_custom_launcher to run your tests. On Thu, Nov 22, 2012 at 4:28 PM, Gottlob Frege <gottlobfrege(a)gmail.com<mailto:gottlobfrege@gmail.com>> wrote: On Thu, Nov 22, 2012 at 1:11 PM, Vicente J. Botet Escriba <vicente.botet(a)wanadoo.fr<mailto:vicente.botet@wanadoo.fr>> wrote: Le 22/11/12 16:51, Gottlob Frege a écrit : I've managed to cross-compile boost for BlackBerry10 devices. (Side-note: there is very little docs on cross compiling) Now, how would I go about "cross-running" the boost tests? In particular, can I hook into the unit-test and/or run rules of Boost.Build? I guess you should see how Boost.Build could support this. Best, Vicente Right. That's kind of what I'm asking. Does Boost.Build support this already? Is there a way to hook into 'run'? I don't find Boost.Build (or docs) easy to use/understand, so my poking around at it didn't find anything, but I could have easily missed it. Tony _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org<mailto:Boost-users@lists.boost.org> http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org<mailto:Boost-users@lists.boost.org> http://lists.boost.org/mailman/listinfo.cgi/boost-users

2 1

Re: [Boost-users] list serialization with boost
by Brian Wood 22 Nov '12

22 Nov '12

Krzysztof Czainski: >2012/11/22 Olivier Austina <olivier.austina(a)gmail.com> > >> Hello, >> I am a newbie of boost and I want to use it. I would like to serialize a >> list. The list is defined with the following data type: >> >> typedef struct person { >> char *name; >> char *first_name; >> struct person *next; >> } person; >> >> person *list_person; >> > > I'd suggest reorganizing your struct into struct person { std::string > first_name; } and useing std::list<person> list. Then serializing and > other operations would probably be trivial. Shalom Another option would be an intrusive list -- http://www.boost.org/doc/libs/1_52_0/doc/html/intrusive.html . The serialization library in Boost doesn't provide support for intrusive containers, but the C++ Middleware Writer -- http://webEbenezer.net has support for intrusive list and rbtree. If you use std::list, the C++ Middleware Writer has some advantages -- http://webEbenezer.net/comparison.html over the serialization library in Boost. (There are serialization and deserialization tests with std::list there.) -- Brian Ebenezer Enterprises -- so far G-d has helped us. http://webEbenezer.net (651) 251-9384

1 0

[mpl] How to use not_ with has_trivial_destructor metafunction
by Christian Henning 22 Nov '12

22 Nov '12

Hi there, I have troubles compiling the following code with Visual C++ 2010 and boost 1.52. #include <boost/mpl/not.hpp> #include <boost/type_traits/has_trivial_destructor.hpp> #include <boost/utility/enable_if.hpp> template <typename T> void foo( typename boost::enable_if< boost::mpl::not_< boost::has_trivial_destructor< T > > >::type* /*ptr*/ = 0 ) { int i = 9; } int main(int argc, char* argv[]) { foo< int >(); return 0; } The error I'm getting is: error C2770: invalid explicit template argument(s) for 'void foo(boost::enable_if<boost::mpl::not_<boost::has_trivial_destructor<T>>>::type *)' Can someone see what the problem might be? Thanks, Christian

2 2

[Range & c++0x Lambdas] Can this be done?
by Robert Jones 22 Nov '12

22 Nov '12

Can the last line, labelled NOT Ok, be made to work? I think the lambda does not publish its result as a bind does, so I suspect it's hopeless. Any thoughts? Thx, Rob. #include <boost/range/adaptor/transformed.hpp> #include <boost/range/algorithm_ext/push_back.hpp> #include <boost/bind.hpp> #include <vector> #include <algorithm> struct S { int i; }; void f( std::vector<int> & out, std::vector<S> & in ) { using boost::adaptors::transformed; // Ok std::transform( in.begin( ), in.end( ), std::back_inserter( out ), bind( & S::i, _1 ) ); // Ok boost::range::push_back( out, in | transformed( bind( & S::i, _1 ) ) ); // Ok std::transform( in.begin( ), in.end( ), std::back_inserter( out ), []( S & s ) { return s.i; } ); // NOT Ok boost::range::push_back( out, in | transformed( []( S & s ) { return s.i; } ) ); }

5 7

list serialization with boost
by Olivier Austina 22 Nov '12

22 Nov '12

Hello, I am a newbie of boost and I want to use it. I would like to serialize a list. The list is defined with the following data type: typedef struct person { char *name; char *first_name; struct person *next; } person; person *list_person; I have the list built from this structure and I want to serialize it on the hard disk. -- Regards Austina

2 1

[Intrusive] unordered_set and thread safety
by Alexandre Hamez 22 Nov '12

22 Nov '12

Hello, I'm currently using intrusive:: unordered_set in a single threaded application. But now, I need to switch to a multi threaded application. As such, the unordered_set must be protected. I don't want to block the whole table with a single mutex. Thus, it would be fine to have a lock per bucket. Furthermore, intrusive:: unordered_set provides a bucket_traits mechanism to enable some customization. So, my question: is it possible to use bucket_traits to have a lock per bucket? Thank you! -- Alexandre Hamez

3 3

Errors compiling with Boost
by Amos Anderson 21 Nov '12

21 Nov '12

Hello -- I'm having trouble compiling our code on redhat gcc 4.4.6 (full specs below). There are a lot of errors in the output, but paring down the list a bit, some examples are pasted below. This exact same code successfully compiles on several OSX compilers, as well as redhat gcc 4.1.2. I posted this to Boost.Build, and someone informed me I had posted to the wrong list. This person mentioned that: > OSX has gcc-4.2 or clang 3.1 for 10.8. > > The gcc project has done some cleanups of standard library code, eliminating > some implicit dependencies. So you might need to explicitly include the now > missing headers. > > Yours, > > Jürgen Does anybody have any suggestions for which headers I might be missing? I do not have direct access to the machine with these compile errors, so it's hard for me to just fiddle with my code. thanks for any advice! Amos. 1) gcc.compile.c++ pymodule/bin/gcc-4.4.6/release-core/threading-multi/SingleCalculator_BP.o In file included from pymodule/SingleCalculator_BP.cc:13: ../tools/boost/boost/range/algorithm/equal.hpp: In function ‘void core::wrap_vector(const std::string&) [with T = boost::shared_ptr<core::energy::SingleCalculator>, bool noProxy = true]’: pymodule/SingleCalculator_BP.cc:33: instantiated from here ../tools/boost/boost/range/algorithm/equal.hpp:160: error: ‘boost::range’ is not a function, ../tools/boost/boost/python/iterator.hpp:92: error: conflict with ‘template<class Accessor1, class Accessor2> boost::python::api::object boost::python::range(Accessor1, Accessor2)’ pymodule/wrap_vector.hh:68: error: in call to ‘range’ "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -g -pthread -fPIC -Dcore_MPI -Dkiss_fft_scalar=float -Wno-unknown-pragmas -Wstrict-aliasing=2 -fno-strict-aliasing -DBOOST_PYTHON_MAX_ARITY=30 -DBOOST_SYSTEM_DYN_LINK=1 -I"../tools/boost" -I"../tools/python/include/python2.7" -I"/import/rh_software/openmpi-1.4.3/include" -c -o "pymodule/bin/gcc-4.4.6/release-core/threading-multi/SingleCalculator_BP.o" "pymodule/SingleCalculator_BP.cc" 2) <snip> instantiated from here ../tools/boost/boost/mpi/detail/mpi_datatype_oarchive.hpp:51: error: invalid use of incomplete type ‘struct boost::is_enum<float>’ ../tools/boost/boost/type_traits/is_enum.hpp:181: error: declaration of ‘struct boost::is_enum<float>’ <snip> 3) <snip> ../tools/boost/boost/mpi/detail/mpi_datatype_oarchive.hpp: In member function ‘void boost::mpi::detail::mpi_datatype_oarchive::save_override(const T&, int) [with T = long unsigned int]’: ../tools/boost/boost/mpi/detail/mpi_datatype_oarchive.hpp:51: error: template instantiation depth exceeds maximum of 128 (use -ftemplate-depth-NN to increase the maximum) instantiating ‘struct boost::is_enum<long unsigned int>’ <snip> 4) <snip> instantiated from here ../tools/boost/boost/archive/detail/check.hpp:78: error: ‘value’ is not a member of ‘boost::archive::detail::check_object_versioning() [with T = boost::serialization::nvp<float>]::typex <snip> g++ -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC)

1 0

SVN access problem
by Simon West 20 Nov '12

20 Nov '12

Hi, I am being asked for a username and password when attempting to check out Boost anonymously using the following command: $ svn co http://svn.boost.org/svn/boost/trunk boost-trunk This command was copy-pasted directly from the instructions for anonymous read-only access described at https://svn.boost.org/trac/boost/wiki/BoostSubversion. This is holding up my progress in creating a patch - can anyone help? Thanks, Simon.

1 0

[enable_if] Compile Time Member Overloading
by Christian Henning 20 Nov '12

20 Nov '12

Hi there, can someone tell me why the following doesn't compile with VS2010 SP1? #include <boost/mpl/and.hpp> #include <boost/type_traits/is_same.hpp> #include <boost/utility/enable_if.hpp> using namespace boost; struct foo { void bla() { read_data_24<int, int>(); } template< typename T1 , typename T2 > void read_data_24( typename enable_if< mpl::and_< mpl::true_ , mpl::bool_< is_same< T1, T2 >::type::value > > >::type* /* ptr */ = 0 ) { int i = 9; } }; int main(int argc, char* argv[]) { return 0; } I get the error: 1>gil_test_vc10.cpp(25): error C2039: 'type' : is not a member of 'boost::enable_if<Cond>' 1> with 1> [ 1> Cond=boost::mpl::and_<boost::mpl::true_,boost::mpl::bool_<false>> 1> ] I tried a couple of hours to have make is happen but I don't get it. Thanks, Christian

3 6

[ASIO] "perf" shows overhead of function calls is very high
by Junchang Wang 19 Nov '12

19 Nov '12

Hi list, I'm new to Boost.asio and am solving scaling problems of a Openflow (TCP based) server. We are using one single io_service for packets receiving and transmitting. A thread pool calling io_service::run() processes HTTP requests. A multi-core server is used. I found we can't get benefits from increasing the size of thread pool when it's size is larger than 6. In other words the system doesn't scale any more on more than 6 cores. I checked the program carefully and can make sure there's no lock contention. I profile the program with Linux perf, and it turns out up to 36% of CPU time is wasted in function calls. 36.39% : 0000000000103300 <boost::detail::function::void_function_obj_invoker3<vigil::openflow::v1::construct_and_load<vigil::openflow::v1::ofp_packet_out, vigil:: : BOOST_FUNCTION_TEMPLATE_PARMS : > : struct BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER : { : static BOOST_FUNCTION_VOID_RETURN_TYPE : invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA 0.02 : 103300: push %rbp 99.66 : 103301: mov %rsp,%rbp 0.00 : 103304: push %r12 0.04 : 103306: mov %rcx,%r12 I printed out the call stack (attached at the tail of this email). It seems for a single packet processing there are more than 30 function calls within Boost. Can that explain why the CPU time on function calls is so high? Are there some ways to avoid this kind of cost? Thanks a lot. --Junchang ================ #0 vigil::openflow::Openflow_datapath::send (this=<optimized out>, msg=0x7ffff567f920) at ../../../../src/coreapps/openflow/openflow-datapath.cc:199 #1 0x00007ffff4c50724 in vigil::openflow::Openflow_datapath::handle_handshake (this=0x7ffff007dd80, e=...) at ../../../../src/coreapps/openflow/openflow-datapath.cc:305 #2 0x00007ffff4c5086a in vigil::openflow::Openflow_datapath::handle_message (this=0x7ffff007dd80, msg=0x7ffff567f920) at ../../../../src/coreapps/openflow/openflow-datapath.cc:228 #3 0x00007ffff4c50a39 in vigil::openflow::Openflow_datapath::recv_cb (this=0x7ffff007dd80, bytes_transferred=<optimized out>) at ../../../../src/coreapps/openflow/openflow-datapath.cc:164 #4 0x00007ffff7bad130 in operator() (a0=<optimized out>, this=0x7ffff007d4b8) at /usr/include/boost/function/function_template.hpp:1013 #5 vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >::handle_recv ( this=0x7ffff007d480, ec=..., bytes_transferred=<optimized out>) at ../../../src/lib/connection.cc:185 #6 0x00007ffff7bb5fba in call<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > >, boost::system::error_code const, unsigned long const> (b2=@0x7ffff568fa10: 8, b1=..., u=..., this=0x7ffff568f9e0) at /usr/include/boost/bind/mem_fn_template.hpp:271 #7 operator()<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > > (u=..., this=0x7ffff568f9e0, a2=@0x7ffff568fa10: 8, a1=...) at /usr/include/boost/bind/mem_fn_template.hpp:286 #8 operator()<boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, const boost::system::error_code&, const long unsigned int&>, boost::_bi::list2<const boost::system::error_code&, const long unsigned int&> > (a=<synthetic pointer>, f=..., this=0x7ffff568f9f0) at /usr/include/boost/bind/bind.hpp:392 #9 operator()<boost::system::error_code, long unsigned int> (a2=@0x7ffff568fa10: 8, a1=..., this=0x7ffff568f9e0) at /usr/include/boost/bind/bind_template.hpp:102 #10 operator() (this=0x7ffff568f9e0) at /usr/include/boost/asio/detail/bind_handler.hpp:97 #11 asio_handler_invoke<boost::asio::detail::binder2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> >, boost::system::error_code, unsigned long> > ( function=<error reading variable: access outside bounds of object referenced via synthetic pointer>) at /usr/include/boost/asio/handler_invoke_hook.hpp:64 #12 boost_asio_handler_invoke_helpers::invoke<boost::asio::detail::binder2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> >, boost::system::error_code, unsigned long>, boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> > > (function=..., context=...) at /usr/include/boost/asio/detail/handler_invoke_helpers.hpp:39 #13 0x00007ffff7bb637b in asio_handler_invoke<boost::asio::detail::binder2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> >, boost::system::error_code, unsigned long>, boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> >, boost::system::error_code, unsigned long> (this_handler=0x7ffff568fbf0, function=...) at /usr/include/boost/asio/detail/bind_handler.hpp:132 #14 invoke<boost::asio::detail::binder2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> >, boost::system::error_code, unsigned long>, boost::asio::detail::binder2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> >, boost::system::error_code, unsigned long> > (context=..., function=...) at /usr/include/boost/asio/detail/handler_invoke_helpers.hpp:39 #15 boost::asio::detail::strand_service::dispatch<boost::asio::detail::binder2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> >, boost::system::error_code, unsigned long> > (this=0x7ffff0001560, impl=@0x7ffff568fbb0: 0x7ffff0047d80, handler=...) at /usr/include/boost/asio/detail/impl/strand_service.hpp:97 #16 0x00007ffff7bb66fa in dispatch<boost::asio::detail::binder2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> >, boost::system::error_code, unsigned long> > ( handler=<error reading variable: access outside bounds of object referenced via synthetic pointer>, this=0x7ffff568fba8) at /usr/include/boost/asio/strand.hpp:159 #17 operator()<boost::system::error_code, long unsigned int> (arg2=<synthetic pointer>, arg1=..., this=0x7ffff568fba8) at /usr/include/boost/asio/detail/wrapped_handler.hpp:65 #18 operator()<boost::system::error_code, long unsigned int> (arg2=<optimized out>, arg1=..., this=0x7ffff568fba0) at ../../../src/lib/connection.cc:64 #19 operator() (this=0x7ffff568fba0) at /usr/include/boost/asio/detail/bind_handler.hpp:97 #20 asio_handler_invoke<boost::asio::detail::binder2<vigil::custom_alloc_handler<boost::asio::detail::wrapped_handler<boost::asio::io_service::strand, boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> > > >, boost::system::error_code, unsigned long> > (function=<error reading variable: access outside bounds of object referenced via synthetic pointer>) at /usr/include/boost/asio/handler_invoke_hook.hpp:64 #21 invoke<boost::asio::detail::binder2<vigil::custom_alloc_handler<boost::asio::detail::wrapped_handler<boost::asio::io_service::strand, boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> > > >, boost::system::error_code, unsigned long>, vigil::custom_alloc_handler<boost::asio::detail::wrapped_handler<boost::asio::io_service::strand, boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp> > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> > > > > (function=..., context=...) at /usr/include/boost/asio/detail/handler_invoke_helpers.hpp:39 #22 boost::asio::detail::reactive_socket_recv_op<boost::asio::mutable_buffers_1, vigil::custom_alloc_handler<boost::asio::detail::wrapped_handler<boost::asio::io_service::strand, boost::_bi::bind_t<void, boost::_mfi::mf2<void, vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >, boost::system::error_code const&, unsigned long const&>, boost::_bi::list3<boost::_bi::value<boost::shared_ptr<vigil::Stream_connection<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > > >, boost::arg<1> (*)(), boost::arg<2> (*)()> > > > >::do_complete (owner=0x6d6b30, base=<optimized out>) at /usr/include/boost/asio/detail/reactive_socket_recv_op.hpp:106 #23 0x0000000000487343 in complete (owner=..., this=0x7ffff007d510) at /usr/include/boost/asio/detail/task_io_service_operation.hpp:35 #24 boost::asio::detail::task_io_service::do_one (this=0x6d6b30, lock=..., this_idle_thread=0x7ffff568fdd0) at /usr/include/boost/asio/detail/impl/task_io_service.ipp:278 #25 0x00000000004874b0 in boost::asio::detail::task_io_service::run (this=0x6d6b30, ec=...) at /usr/include/boost/asio/detail/impl/task_io_service.ipp:130 #26 0x00000000004875c9 in boost::asio::io_service::run (this=0x6d68f8) at /usr/include/boost/asio/impl/io_service.ipp:57 #27 0x00007ffff7971ce9 in thread_proxy () from /usr/lib/libboost_thread.so.1.46.1 #28 0x00007ffff5f2ee9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #29 0x00007ffff6237cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6 #30 0x0000000000000000 in ?? ()

2 2

code review please? [boost::asio]
by Littlefield, Tyler 18 Nov '12

18 Nov '12

hello all: I was curious if some boost::asio guru would mind checking this out. I just posted my code in, I'd like to know if there's anything that could be done better. Thanks, //client.h #pragma once #include <queue> #include <boost/asio.hpp> #include <boost/bind.hpp> #include "ClientBuffer.h" class Client { protected: boost::asio::ip::tcp::socket _socket; boost::asio::io_service &_service; std::queue<ClientBuffer*> _buffers; bool _writing; void StartWrite(); void HandleWrite(const boost::system::error_code& error); public: Client(boost::asio::io_service &service); ~Client(); virtual boost::asio::ip::tcp::socket& GetSocket(); virtual void Start() = 0; void Write(const char* data); void Write(void* data, unsigned int size); void Write(const std::string &data); }; //client.cpp #include <boost/asio.hpp> #include <boost/bind.hpp> #include "client.h" #include "ClientBuffer.h" Client::Client(boost::asio::io_service &service): _service(service), _socket(service), _writing(false) { } Client::~Client() { } void Client::StartWrite() { //we don't write if we're already writing. We just content ourselves with having pushed the message to the queue. if (_writing) { return; } //we're writing now. _writing = true; ClientBuffer* buffer = NULL; buffer = _buffers.front(); boost::asio::async_write(_socket, boost::asio::buffer(buffer->GetBuffer(), buffer->GetSize()), boost::bind(&Client::HandleWrite, this, boost::asio::placeholders::error)); } void Client::HandleWrite(const boost::system::error_code& error) { if (_buffers.empty()) { _writing = false; return; } ClientBuffer* buffer = _buffers.front(); _buffers.pop(); if (buffer) delete buffer; if (_buffers.empty()) _writing = false; else StartWrite(); } boost::asio::ip::tcp::socket& Client::GetSocket() { return _socket; } void Client::Write(const char* data) { ClientBuffer* buffer = new ClientBuffer(data); _buffers.push(buffer); StartWrite(); } void Client::Write(void* data, unsigned int size) { ClientBuffer* buffer = new ClientBuffer(data, size); _buffers.push(buffer); StartWrite(); } void Client::Write(const std::string &data) { ClientBuffer* buffer = new ClientBuffer(data); _buffers.push(buffer); StartWrite(); } //TelnetClient.h /* *this client is responsible for handling the telnet protocol. */ #pragma once #include <boost/asio.hpp> #include <boost/bind.hpp> #include "client.h" #include "ClientBuffer.h" class TelnetClient:public Client { int _state; boost::asio::streambuf _buffer; public: virtual void Start(); void Read(); void HandleRead(const boost::system::error_code& error); void HandleCommand(const std::string &line); }; //TelnetClient.cpp #include <string> #include <istream> #include <boost/asio.hpp> #include <boost/bind.hpp> #include "client.h" #include "TelnetClient.h" void TelnetClient::Start() { Write("Welcome to SapphireMud.\n"); Write("Use load <player> <password> to load a character.\n"); Write("Use create <player> <password> to create a new player.\n"); _state = 1; Read(); } void TelnetClient::Read() { boost::asio::async_read_until(_socket, _buffer, '\n', boost::bind(&TelnetClient::HandleRead, this, boost::asio::placeholders::error)); } void TelnetClient::HandleRead(const boost::system::error_code& error) { char buffer[2048]; if (error) { //do something here return; } std::istream input(&_buffer); input.getline(buffer, 2048); HandleCommand(buffer); Read(); } void TelnetClient::HandleCommand(const std::string &line) { Write("I don't understand that!\n"); } -- Take care, Ty http://tds-solutions.net The aspen project: a barebones light-weight mud engine: http://code.google.com/p/aspenmud He that will not reason is a bigot; he that cannot reason is a fool; he that dares not reason is a slave.

2 2

Re: [Boost-users] What is the best idiom for using call_once ?
by John M. Dlugosz 18 Nov '12

18 Nov '12

Date: Sat, 17 Nov 2012 13:51:48 +0100 From: "Vicente J. Botet Escriba" <vicente.botet(a)wanadoo.fr> > Hi, your code suffers from the problem you try to avoid "But we all know this is not > thread safe, at least for the first call" at least in c++98 as you are using static > variables. Actually, my post described the circumstances under which it does in fact work: when VarType has a built-in type that is initialized before program execution, or on C++11 with a constexpr constructor. > here they are some pointers that while not responding exactly to your > question them could help you. > > http://www.justsoftwaresolutions.co.uk/threading/multithreading-in-c++0x-pa… Interesting, the post gets it wrong. A unique_ptr has a constructor (in C++03) so still has the problem. Or, maybe the article is just not clear on how it is to be used: if you must initialize an instance of lazy_init (to the null pointer internally) _before_ multiple threads ask it to be "initialized", that just pushes the problem back to the earlier step. I can see the usefulness though, if you just want to put off the expensive "real" initialization until needed, but can arrange the pre-initialization to be done for-sure earlier. > > http://stackoverflow.com/questions/12302057/c11-safe-double-checked-locking… This points out that under C++11 rules, static locals are thread safe for the first-time initialization. That explains why there is no fancy construct for doing so; it's just there! Nice. Or it will be, some day. I looked at the code generated by Microsoft VS2010 and it does not give this feature, alas. It does tell me though that a compatibility construct like I'm looking for ought to expand into a plain static local for compilers that do work that way; just let the compiler do it. All the more reason to abstract the issue for current uses! —John

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What is the best idiom for using call_once ?
by John M. Dlugosz 17 Nov '12

17 Nov '12

Consider the issue of a static variable inside a function: the idea is to initialize on first use (if any). But we all know this is not thread safe, at least for the first call. Since the C++11 standard library includes a feature just like boost::call_once, that would seem to be the proper way to address this moving forward. And, I don't see anything in the standard that would be more powerful and direct for this purpose, which leaves me to wonder if there is still more that should have been done. But, my question is, what is the "best" or slickest way to use it (for this purpose)? If Lambda functions are available (which is not the case on every platform my code needs to support) _and_ the type of variable in question has some kind of "dead" state available, it's not too bad to write something like this: VarType obtain_singleton() { static boost::once_flag f=BOOST_ONCE_INIT; static VarType retval; boost::call_once (f, [] { retval=the_real_initialization(); }); return retval; } //...later // static VarType val= the_real_initialization; // !!not thread safe on first call!! static VarType val= obtain_singleton(); // do this instead (and write it in another function for conciseness) However, it's more awkward if I can't declare VarType retval to be pre-initialized to some "dead" value, or if it has any constructor at all and would itself re-introduce the thread safety issue! In short, it only works correctly (without the availability of the constexpr feature and types having constructors of such a nature) for primitive types. I've worked around it using a pointer and having the real_init function itself contain a static variable. That makes me think that there should be a simpler way to do it. Or, once the "best way" has been determined, why can't it be done once and succinctly reused? Anyone have one to share?

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Re: [Boost-users] Boost 1.52 .zip bootstrap file -- missing?
by Adam J. Cooper 17 Nov '12

17 Nov '12

I downloaded "boost_1_52_0.zip" from here on 11/16 http://www.boost.org/users/history/version_1_52_0.html I used the native unzip built into Windows 8. There were two folders in the root directory, docs and source files. There was no bootstrap file or any other tools files. - Adam ------------------------------ Message: 2 Date: Sat, 17 Nov 2012 10:13:55 +0000 From: Daniel James <dnljms(a)gmail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Boost 1.52 .zip bootstrap file -- missing? Message-ID: <CAHOE3yct3am=xamtRZrVGjK+_BjyXESgu9ofMm_F2vyb8435DA(a)mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 On 16 November 2012 23:39, Adam J. Cooper <adam(a)adamcooper.com> wrote: > I download the .zip version of Boost 1.52 > > However, I do not see the bootstrap file when I unzip the contents. That's odd. I just downloaded and there's a 'bootstrap.sh' and 'bootstrap.bat' in the 'boost_1_52_0' directory. Where did you download it from, and what did you use to unzip it? _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users End of Boost-users Digest, Vol 3272, Issue 2 ********************************************

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Boost 1.52 .zip bootstrap file -- missing?
by Adam J. Cooper 17 Nov '12

17 Nov '12

I download the .zip version of Boost 1.52 However, I do not see the bootstrap file when I unzip the contents. Please advise. Thank you, Adam

2 1

(no subject)
by mega deth 16 Nov '12

16 Nov '12

http://mcrtaky.org/wp-content/themes/twentyeleven/hotnews.php?youth293.gif

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Updated serialization performance tests
by Brian Wood 16 Nov '12

16 Nov '12

Shalom I've updated this page -- http://webEbenezer.net/comparison.html with results from Boost 1.52. A few notes about the testing: I decided to use -O2 on the Linux/g++ tests. In previous tests I used -O3. I hadn't updated the Windows test results since the Boost 1.48 time-frame. Around Boost 1.51 I had to start building the serialization library in Boost with runtime-link=static in order to get the Windows tests to build. I haven't understood why that became necessary, but the results for the serialization library in Boost seem to have been adversely affected by this. On Windows, I now report that tests built with the serialization library in Boost are over 1.8 times slower than parallel Ebenezer tests. Previously I reported the tests built with the serialization library in Boost were between 1.7 and 1.8 times slower than the Ebenezer tests. -- Brian Ebenezer Enterprises -- making programming fun again. http://webEbenezer.net

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how to build a release version of my application from source control using boost libs?
by Anil 16 Nov '12

16 Nov '12

Trying to build a release version from source code put into Clearcase source control. Boost is installed on my computer hard disk. what libraries should I copy to the repository? I tried copying libboost_regex-vc90-mt-gd-1_51.lib but it still gave an error. 1>------ Build started: Project: MyApplication, Configuration: Release Win32 ------ 1>Compiling... 1>MyApplication.cpp 1>.\MyApplication.cpp(40) : warning C4627: '#include <boost/property_tree/ptree.hpp>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(41) : warning C4627: '#include <boost/property_tree/xml_parser.hpp>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(42) : warning C4627: '#include <boost/foreach.hpp>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(43) : warning C4627: '#include <boost/lexical_cast.hpp>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(44) : warning C4627: '#include <string>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(45) : warning C4627: '#include <set>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(46) : warning C4627: '#include <exception>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(47) : warning C4627: '#include <iostream>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(48) : warning C4627: '#include <fstream>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(49) : warning C4627: '#include "MyApplication.h"': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(50) : warning C4627: '#include <boost/filesystem.hpp>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(51) : warning C4627: '#include <boost/regex.hpp>': skipped when looking for precompiled header use 1> Add directive to 'stdafx.h' or rebuild precompiled header 1>.\MyApplication.cpp(875) : fatal error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "stdafx.h"' to your source? 1>Build log was saved at "file://a:\MyApplication\Release\BuildLog.htm" 1>MyApplication - 1 error(s), 12 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== how to build a release version of my application from source control using boost libs?

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Newbie-Question: recursive_directory_iterator and Unicode
by Andy 16 Nov '12

16 Nov '12

Hi all, i'm using the following code-part to show a file-listing of the current directory: boost::locale::generator gen; std::locale l = gen(""); std::locale::global(l); boost::filesystem::recursive_directory_iterator it(L"."); boost::filesystem::recursive_directory_iterator itEnd; while (it != itEnd) { if (boost::filesystem::status_known(it->status()) && boost::filesystem::is_regular(it->status())) { cout << it->path() << endl; } ++it; } This work's great but not if some files contain unicode-characters. If so, then a lot of ????'s will be printed. Could anyone show me how to print those unicode-characters to stdout? Using wcout won't print anything. I'm new to boost and unicode and i'm not sure if this is a problem of boost! I'm using MinGW (gcc (tdm-1) 4.6.1), Boost 1-52, ICU 50.1 - Output goes to the windows command-prompt (Already tried "chcp 65001") Thanks, Andreas

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Build boost 1.52 on Mac OS X 10.8.2 with Clang c++11
by Kikohs x 15 Nov '12

15 Nov '12

Hello, I cannot compile boost with clang 3.1 on Mac os x 10.8.2. This is what I did: ./boostrap.sh --with-toolset=clang ./b2 toolset=clang cxxflags="-std=c++11 -stdlib=libc++" linkflags="-stdlib=libc++" I also tried without chrono, test, wave and signals. I tried a user-config.jam with using clang-darwin This is the error I have for almost every file: /boost/config/select_stdlib_config.hpp:18:12: fatal error: 'cstddef' file not found It is kind of similar to [ http://stackoverflow.com/questions/8486077/how-to-compile-link-boost-with-c… ] I do have the latest Xcode 4.5.2 with the command line tools installed. Here is part of the console output: Kikohs:trunk kikohs$ ./b2 toolset=clang cxxflags="-std=c++11 -stdlib=libc++" linkflags="-stdlib=libc++" Performing configuration checks - 32-bit : no - 64-bit : yes - x86 : yes - has_icu builds : no warning: Graph library does not contain MPI-based parallel components. note: to enable them, add "using mpi ;" to your user-config.jam - gcc visibility : yes - long double support : no warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. Building the Boost C++ Libraries. - iconv (libc) : no - iconv (separate) : yes - icu : no - icu (lib64) : no Component configuration: - atomic : building - chrono : building - context : building - date_time : building - exception : building - filesystem : building - graph : building - graph_parallel : building - iostreams : building - locale : building - math : building - mpi : building - program_options : building - python : building - random : building - regex : building - serialization : building - signals : building - system : building - test : building - thread : building - timer : building - wave : building ...patience... ...patience... ...patience... ...patience... ...found 8672 targets... ...updating 1127 targets... common.mkdir bin.v2/libs/atomic common.mkdir bin.v2/libs/atomic/build common.mkdir bin.v2/libs/atomic/build/clang-darwin-4.2.1 common.mkdir bin.v2/libs/atomic/build/clang-darwin-4.2.1/debug clang-darwin.compile.c++ bin.v2/libs/atomic/build/clang-darwin-4.2.1/debug/lockpool.o In file included from libs/atomic/src/lockpool.cpp:1: ./boost/atomic.hpp:10:10: fatal error: 'cstddef' file not found #include <cstddef> ^ 1 error generated. "clang++" -x c++ -O0 -g -std=c++11 -stdlib=libc++ -O0 -fno-inline -Wall -g -DBOOST_ALL_NO_LIB=1 -DBOOST_ATOMIC_DYN_LINK=1 -DBOOST_ATOMIC_SOURCE -I"." -c -o "bin.v2/libs/atomic/build/clang-darwin-4.2.1/debug/lockpool.o" "libs/atomic/src/lockpool.cpp" Any help would be greatly appreciated, Thank you, Kikohs

2 2

A Special Note for Boost 1.52.0 and Higher - how this affects me?
by Adam Romanek 15 Nov '12

15 Nov '12

Hi, I've just read the Special Note for Boost 1.52.0 and Higher. I must say that I don't fully understand what's going on and how this affects me. I'm using some of Boost's libraries with gcc on Ubuntu. Most often it's gcc 4.4.3, sometimes 4.6.3 but without C++0x mode. Does the change in boost::result_of affect me in any way? Can it make my code fail to compile or make it behave in a different way than before? I just don't understand whether a switch from Boost 1.51.0 to 1.52.0 may do any harm to my code. WBR, Adam Romanek

3 2

[fusion] remove_if and as_vector with Placeholder Expression as predicate
by Felipe Magno de Almeida 15 Nov '12

15 Nov '12

Hello, I'm trying to remove_if a few elements from a fusion sequence. But it is instantiating my predicate with the placeholder from MPL later on. Including with as_vector. The following code generates the error code I'm pasting by the end of the message. I'm using GCC 4.7.2 and Linux x86_64. If I wrap meta_func<mpl::_1> in a mpl::lambda<>::type then the errors following the first error messages is what I get. I'm not sure if I'm doing something wrong here. If anyone could please shed some light, I would really appreciate it. #include <boost/fusion/include/as_vector.hpp> #include <boost/fusion/include/remove_if.hpp> namespace mpl = boost::mpl; namespace fusion = boost::fusion; struct element { typedef mpl::false_ type; }; template <typename T> struct meta_func { typedef typename T::type type; }; int main() { fusion::vector<element, element> e; fusion::as_vector(fusion::remove_if<meta_func<mpl::_1> >(e)); } -- main.cpp: In instantiation of ‘struct meta_func<mpl_::arg<1> >’: ../boost/boost_1_51_0/boost/mpl/aux_/nested_type_wknd.hpp:26:31: required from ‘struct boost::mpl::aux::nested_type_wknd<meta_func<mpl_::arg<1> > >’ ../boost/boost_1_51_0/boost/mpl/not.hpp:39:8: required from ‘struct boost::mpl::not_<meta_func<mpl_::arg<1> > >’ ../boost/boost_1_51_0/boost/fusion/container/vector/detail/preprocessed/as_vector10.hpp:48:36: required from ‘static typename boost::fusion::detail::as_vector<2>::apply<I0>::type boost::fusion::detail::as_vector<2>::call(const Iterator&) [with Iterator = boost::fusion::filter_iterator<boost::fusion::forward_traversal_tag, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0>, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 2>, boost::mpl::not_<meta_func<mpl_::arg<1> > > >; typename boost::fusion::detail::as_vector<2>::apply<I0>::type = boost::fusion::vector2<element, element>]’ ../boost/boost_1_51_0/boost/fusion/container/vector/convert.hpp:43:44: required from ‘typename boost::fusion::result_of::as_vector<const Sequence>::type boost::fusion::as_vector(const Sequence&) [with Sequence = boost::fusion::filter_view<const boost::fusion::vector<element, element>, boost::mpl::not_<meta_func<mpl_::arg<1> > > >; typename boost::fusion::result_of::as_vector<const Sequence>::type = boost::fusion::vector2<element, element>]’ main.cpp:22:62: required from here main.cpp:16:28: error: no type named ‘type’ in ‘struct mpl_::arg<1>’ In file included from ../boost/boost_1_51_0/boost/mpl/is_sequence.hpp:17:0, from ../boost/boost_1_51_0/boost/fusion/support/detail/is_mpl_sequence.hpp:12, from ../boost/boost_1_51_0/boost/fusion/support/tag_of.hpp:13, from ../boost/boost_1_51_0/boost/fusion/iterator/next.hpp:10, from ../boost/boost_1_51_0/boost/fusion/container/vector/vector10.hpp:13, from ../boost/boost_1_51_0/boost/fusion/container/vector/vector_fwd.hpp:14, from ../boost/boost_1_51_0/boost/fusion/container/vector/vector.hpp:10, from ../boost/boost_1_51_0/boost/fusion/container/vector/detail/as_vector.hpp:18, from ../boost/boost_1_51_0/boost/fusion/container/vector/convert.hpp:10, from ../boost/boost_1_51_0/boost/fusion/include/as_vector.hpp:10, from main.cpp:2: ../boost/boost_1_51_0/boost/mpl/not.hpp: In instantiation of ‘struct boost::mpl::not_<meta_func<mpl_::arg<1> > >’: ../boost/boost_1_51_0/boost/fusion/container/vector/detail/preprocessed/as_vector10.hpp:48:36: required from ‘static typename boost::fusion::detail::as_vector<2>::apply<I0>::type boost::fusion::detail::as_vector<2>::call(const Iterator&) [with Iterator = boost::fusion::filter_iterator<boost::fusion::forward_traversal_tag, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0>, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 2>, boost::mpl::not_<meta_func<mpl_::arg<1> > > >; typename boost::fusion::detail::as_vector<2>::apply<I0>::type = boost::fusion::vector2<element, element>]’ ../boost/boost_1_51_0/boost/fusion/container/vector/convert.hpp:43:44: required from ‘typename boost::fusion::result_of::as_vector<const Sequence>::type boost::fusion::as_vector(const Sequence&) [with Sequence = boost::fusion::filter_view<const boost::fusion::vector<element, element>, boost::mpl::not_<meta_func<mpl_::arg<1> > > >; typename boost::fusion::result_of::as_vector<const Sequence>::type = boost::fusion::vector2<element, element>]’ main.cpp:22:62: required from here ../boost/boost_1_51_0/boost/mpl/not.hpp:39:8: error: ‘value’ is not a member of ‘boost::mpl::aux::nested_type_wknd<meta_func<mpl_::arg<1> > >’ -- -*- mode: compilation; default-directory: "~/dev/test/" -*- Compilation started at Mon Nov 12 15:09:15 bjam -q -j8 ...patience... ...found 584 targets... ...updating 2 targets... gcc.compile.c++ bin/gcc-4.7.2/debug/main.o In file included from ../boost/boost_1_51_0/boost/mpl/is_sequence.hpp:17:0, from ../boost/boost_1_51_0/boost/fusion/support/detail/is_mpl_sequence.hpp:12, from ../boost/boost_1_51_0/boost/fusion/support/tag_of.hpp:13, from ../boost/boost_1_51_0/boost/fusion/iterator/next.hpp:10, from ../boost/boost_1_51_0/boost/fusion/container/vector/vector10.hpp:13, from ../boost/boost_1_51_0/boost/fusion/container/vector/vector_fwd.hpp:14, from ../boost/boost_1_51_0/boost/fusion/container/vector/vector.hpp:10, from ../boost/boost_1_51_0/boost/fusion/container/vector/detail/as_vector.hpp:18, from ../boost/boost_1_51_0/boost/fusion/container/vector/convert.hpp:10, from ../boost/boost_1_51_0/boost/fusion/include/as_vector.hpp:10, from main.cpp:2: ../boost/boost_1_51_0/boost/mpl/not.hpp: In instantiation of ‘struct boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> >’: ../boost/boost_1_51_0/boost/mpl/aux_/preprocessed/gcc/apply_wrap.hpp:36:8: required from ‘struct boost::mpl::apply_wrap1<boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> >, element>’ ../boost/boost_1_51_0/boost/mpl/aux_/preprocessed/gcc/bind.hpp:144:21: required from ‘struct boost::mpl::bind1<boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> >, boost::mpl::bind1<boost::mpl::quote1<boost::fusion::result_of::value_of>, mpl_::arg<1> > >::apply<boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0> >’ ../boost/boost_1_51_0/boost/mpl/aux_/preprocessed/gcc/apply_wrap.hpp:36:8: required from ‘struct boost::mpl::apply_wrap1<boost::mpl::bind1<boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> >, boost::mpl::bind1<boost::mpl::quote1<boost::fusion::result_of::value_of>, mpl_::arg<1> > >, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0> >’ ../boost/boost_1_51_0/boost/mpl/aux_/preprocessed/gcc/apply.hpp:42:8: required from ‘struct boost::mpl::apply1<boost::mpl::bind1<boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> >, boost::mpl::bind1<boost::mpl::quote1<boost::fusion::result_of::value_of>, mpl_::arg<1> > >, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0> >’ ../boost/boost_1_51_0/boost/fusion/algorithm/query/detail/find_if.hpp:33:35: required from ‘struct boost::fusion::detail::apply_filter<boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0>, boost::mpl::bind1<boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> >, boost::mpl::bind1<boost::mpl::quote1<boost::fusion::result_of::value_of>, mpl_::arg<1> > > >’ ../boost/boost_1_51_0/boost/mpl/if.hpp:67:11: [ skipping 10 instantiation contexts ] ../boost/boost_1_51_0/boost/fusion/support/tag_of.hpp:69:16: required from ‘struct boost::fusion::traits::tag_of<boost::fusion::filter_iterator<boost::fusion::forward_traversal_tag, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0>, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 2>, boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> > >, void>’ ../boost/boost_1_51_0/boost/fusion/support/tag_of.hpp:77:16: required from ‘struct boost::fusion::detail::tag_of<boost::fusion::filter_iterator<boost::fusion::forward_traversal_tag, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0>, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 2>, boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> > > >’ ../boost/boost_1_51_0/boost/fusion/iterator/distance.hpp:60:16: required from ‘struct boost::fusion::result_of::distance<boost::fusion::filter_iterator<boost::fusion::forward_traversal_tag, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 0>, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 2>, boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> > >, boost::fusion::filter_iterator<boost::fusion::forward_traversal_tag, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 2>, boost::fusion::vector_iterator<const boost::fusion::vector<element, element>, 2>, boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> > > >’ ../boost/boost_1_51_0/boost/fusion/view/filter_view/detail/size_impl.hpp:27:20: required from ‘struct boost::fusion::extension::size_impl<boost::fusion::filter_view_tag>::apply<const boost::fusion::filter_view<const boost::fusion::vector<element, element>, boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> > > >’ ../boost/boost_1_51_0/boost/fusion/sequence/intrinsic/size.hpp:68:16: required from ‘struct boost::fusion::result_of::size<const boost::fusion::filter_view<const boost::fusion::vector<element, element>, boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> > > >’ ../boost/boost_1_51_0/boost/fusion/container/vector/convert.hpp:23:82: required from ‘struct boost::fusion::result_of::as_vector<const boost::fusion::filter_view<const boost::fusion::vector<element, element>, boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> > > >’ ../boost/boost_1_51_0/boost/fusion/container/vector/convert.hpp:40:5: required by substitution of ‘template<class Sequence> typename boost::fusion::result_of::as_vector<const Sequence>::type boost::fusion::as_vector(const Sequence&) [with Sequence = boost::fusion::filter_view<const boost::fusion::vector<element, element>, boost::mpl::not_<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> > >]’ main.cpp:22:81: required from here ../boost/boost_1_51_0/boost/mpl/not.hpp:39:8: error: ‘value’ is not a member of ‘boost::mpl::aux::nested_type_wknd<boost::mpl::protect<boost::mpl::bind1<boost::mpl::quote1<meta_func, mpl_::void_>, mpl_::arg<1> >, 0> >’ Thanks in advance, -- Felipe Magno de Almeida

4 4

Am I building 64-bit Boost correctly?
by Ramon F Herrera 15 Nov '12

15 Nov '12

I have finally decided to get my feet wet, when it comes to the 64-bit world. Honestly, all my fears turned out to be valid, and then some. I have a MSVS-2010 Solution that includes several varied projects: GUI, libraries (both kids) and Shell Extensions. Since a couple of my projects depend on Boost (the greatest set of libraries ever known to man! Boost rocks! Boost rules!!... but I digress): I decided to start there. Since I am getting some boost-related error messages, I figure that step number zero is to make sure that my Boost installation is healthy. This is how I build it: .\bootstrap.bat .\bjam.exe --with-date_time --with-filesystem --with-regex --with-system --stagedir=. --build-type=complete toolset=msvc-10.0 address-model=64 Notice that the above commands have served me well for years (minus the last parameter, which I am now using for the first time). Is that all I need? TIA, -Ramon

4 5

read_graphml: read more than 1 graph from the same graphml file
by Bartha Attila 15 Nov '12

15 Nov '12

Hello ! Is there a way a to read more than one graph from a .graphml file using read_graphml ? Here's what I tried: -open an input stream to the graphml file; -call a function to read the graph from the file (the function uses read_graphml) and print the graph to stdout; -call the same function again, hoping that the second graph from the file will be read; -close the file input stream. If I call the function once, it works fine and returns the first graph defined in the graphml file. If I call the function the twice, I get the following runtime exception: 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::property_tree::ptree_bad_path> >' what(): No such node (graphml) The graphml file looks like this : <graphml ....header stuff... > <key id= ...key definitions...> <graph id="TestSite1" edgedefault="undirected"> <node id="node0"> <data key="map">map1</data> <data key="x">5.0</data> <data key="y">1.0</data> </node> <node id="node1"> <data key="map">map1</data> <data key="x">5.0</data> <data key="y">4.0</data> </node> <edge source="node0" target="node1"/> </graph> <graph id="TestSite2" edgedefault="undirected"> <node id="node0"> <data key="map">map3</data> <data key="x">6.0</data> <data key="y">2.0</data> </node> <node id="node1"> <data key="map">map4</data> <data key="x">7.0</data> <data key="y">9.0</data> </node> <edge source="node0" target="node1"/> </graph></graphml> I can correctly get the data of TestSite1 graph if I call the function once. How can I get the TestSite2 graph from the same file, or, for that matter, how can I get one specific graph (ex TestSiteN) ? Thanx for any help, -attoparsec-

2 2

Further Boost.MPI development
by Matthias Troyer 15 Nov '12

15 Nov '12

Dear Boost.MPI users, With the MPI-3 standard having been finalized we want to intensify Boost.MPI development as soon as my crazy teaching schedule this fall gives me time from the middle of next month. With the deprecation of the - little used - official MPI C++ API in MPI-3 Boost.MPI has a chance of becoming a de facto standard C++ API for MPI. We first want to focus on features from MPI-2 and MPI-3 that are widely used or useful. For this purpose I would like to collect suggestions. Can you please reply and mention the functions of MPI that you would most like to see supported by Boost.MPI. Best regards Matthias

6 5

[coroutine] errors compiling with clang 3.2
by Marco Craveiro 14 Nov '12

14 Nov '12

Hi boost-users, As reported by Eugene Yakubovich[1], I am seeing problems compiling boost coroutine with clang 3.1 on debian testing. I got my sources from git://gitorious.org/boost-dev/boost-dev.git at commit c083660c54b88ca1ce9a940f4a71bc6c3ab89003. The error I get is: /boost/coroutine/detail/coroutine_object.hpp:54:46: error: expected expression Context * ctx( hldr->data.get().get< 0 >() ); ^ The same code compiles and runs fine with gcc 4.7. In both cases I'm using C++11. I just want to double-check that this is some kind of problem with clang - since 3.2 is on the wings I was wondering if this would be resolved by the upgrade. If anyone has managed to get it working with 3.1 I'd appreciate some pointers. Many thanks for your time, Marco -- So young, and already so unknown -- Pauli blog: http://mcraveiro.blogspot.com [1] http://boost.2283326.n4.nabble.com/Review-Coroutine-reviewstarts-today-Sept…

2 6

boost asio: boost::asio::deadline_timer blocking ?
by Avi Bahra 14 Nov '12

14 Nov '12

Answers: 1. I doubt this is really an issue is with deadline_timer accuracy. 2. Are you double-scheduling the same timer? Or are you just doing some extra work, every time a single expiry event crosses a minute boundary? I wouldn't double-schedule the same timer, if that's what you're doing. >> No. I record the next minute boundary, when the timer fires, I check the current >> time against the minute boundary. So no double scheduling. 3. The timer may be susceptible to time changes on your system. It needn't be, but don't assume that means it's not. It might be worth looking at the implementation, to make sure. >> The problem occurs independent of the time change. 4. Slow disk could be an issue, but only if your io_service thread(s) are blocking on disk activity (either direct disk access or page faults). The file descriptors you're talking about have nothing to do with disk files, in this case. >> The current server is single threaded, so my this was my first suspect. >> I log every client request to a log file. I had suspected that a slow >> file system, would block when logging the client request, and affect the timer. >> I added extra instrumentation to time the logging. However this was not the cause 5. Depends on your accuracy needs and the load on the rest of the system. On a system under moderate loads, I'd expect no problems using ASIO to perform processing on a one-second granularity. Just be sure to compute the next expiry based the current time, rather than sleeping for 1 second. If you want to make this resilient to time change, you can use a monotonic timebase. Matt ================================================================ The client is designed to cancel long running connection to the server.. ( > 20seconds) This timeout is based on boost asio example: http://www.boost.org/doc/libs/1_47_0/doc/html/boost_asio/example/timeouts/a… What I have noticed is that the 1 second timer in the server does not fire, *when* client request have been cancelled. It appears that some of chain of async handlers that are being called in the server, during this process, cause the timer to hang ? For example if the client cancels after 20 seconds, then something in the server must been blocking, for that period ? When the client cancels, the server::handle_write(..), closes both end of the socket. So I see the following message logged: shutdown: Transport endpoint is not connected Here is the async' functions in the server: void server::start_accept() { connection_ptr new_conn( new connection( io_service_ ) ); acceptor_.async_accept( new_conn->socket(), boost::bind( &server::handle_accept, this, boost::asio::placeholders::error, new_conn ) ); } void server::handle_accept( const boost::system::error_code& e, connection_ptr conn ) { if (!acceptor_.is_open()) { if (serverEnv_.debug()) cout << " server::handle_accept: acceptor is closed, returning\n"; return; } if ( !e ) { conn->async_read( inbound_request_, boost::bind( &server::handle_read, this, boost::asio::placeholders::error,conn ) ); } else { if (e != boost::asio::error::operation_aborted) { // An error occurred. Log it LogToCout toCoutAsWell; LOG(Log::ERR, " server::handle_accept error occurred " << e.message()); } } start_accept(); } void server::handle_read( const boost::system::error_code& e,connection_ptr conn ) { if ( !e ) { try { // Service the in bound request, handling the request will populate the outbound_response_ // Note:: Handle request will first authenticate outbound_response_.set_cmd( inbound_request_.handleRequest( this ) ); } catch (exception& e) { outbound_response_.set_cmd( PreAllocatedReply::error_cmd( e.what() )); } // *Reply* back to the client: conn->async_write( outbound_response_, boost::bind(&server::handle_write, this, boost::asio::placeholders::error, conn ) ); } else { LOG(Log::ERR, "server::handle_read error occurred : " << e.message()); } } void server::handle_write( const boost::system::error_code& e, connection_ptr conn ) { boost::system::error_code ec; conn->socket().shutdown(boost::asio::ip::tcp::socket::shutdown_both,ec); if (ec) { ecf::LogToCout logToCout; LOG(Log::ERR,"server::handle_write: socket shutdown both failed: " << ec.message()); return; } } I had noticed that I was not checking error code in the server::handle_write(..) but I'm not sure if this would account, for why the timer does not fire temporarily. Ta, Avi

1 0

[msm] Why does it take so many bytes to represent a state machine?
by ☂Josh Chia (谢任中) 13 Nov '12

13 Nov '12

Hi, I'm using msm to store the state of many small objects. Each one is around 24 bytes on its own. However, I just found out from experimentation that a MSM state machine takes many bytes to store. For the following program, the print out is: entering: State1 104 48 This indicates that the very simple one-state, no-transition, machine is 104 bytes, and takes 48 bytes even to serialized. The front::state_machine_def, however, is only 1 byte, though I suspect thet real state is stored only in the 104-byte back::state_machine. Even the SimpleTutorial.cpp example, when I adapt it to print the size, shows 128 bytes. Theoretically, all this information take no more than a few bits to store, and one byte is generous. What's the internal representation of a state machine and how can I optimize the size of the representation? This matters for my use case because I have many small objects for which I want to maintain state, that are only ~20 bytes each. I thought perhaps I could mitigate this size problem by storing the serialized bytes but even the serialized bytes are many. I'm using boost 1.51 and gcc 4.7.2 on 64-bit Linux. Josh #include <iostream> #include <strstream> #include <boost/archive/text_oarchive.hpp> #include <boost/msm/back/state_machine.hpp> #include <boost/msm/front/functor_row.hpp> #include <boost/msm/front/state_machine_def.hpp> using namespace std; namespace mpl = boost::mpl; namespace msm = boost::msm; using namespace msm::front; struct Event { }; struct state_ : public msm::front::state_machine_def<state_> { struct State1 : public msm::front::state<> { // optional entry/exit methods template <class Event,class FSM> void on_entry(Event const&, FSM& f) { std::cout << "entering: State1" << std::endl; } template <class Event,class FSM> void on_exit(Event const&,FSM& ) { std::cout << "leaving: State1" << std::endl; } }; typedef State1 initial_state; struct transition_table : mpl::vector< > {}; }; typedef msm::back::state_machine<state_> State; int main() { State state; state.start(); cout << sizeof(state) << endl; ostrstream os; { boost::archive::text_oarchive oa(os); oa << state; } cout << os.pcount() << endl; return 0; }

2 4

[msm] How to cause no_transition for cases of guard returning false?
by ☂Josh Chia (谢任中) 13 Nov '12

13 Nov '12

Hi, I want no_transition() to be called whenever no row matches, even if there is a row that does not match only because the guard returns false. How can I achieve this? I want to be strict about the input events. I can probably workaround this by putting guardless rows at the top whose action is to call no_transition(), but I'm hoping to find a cleaner solution. If I get this behavior in msm, then the following code should output "no transition..." as its last line. Right now, with boost 1.51, it doesn't. It just prints "entering State1". Josh #include <iostream> #include <boost/msm/back/state_machine.hpp> #include <boost/msm/front/functor_row.hpp> #include <boost/msm/front/state_machine_def.hpp> using namespace std; namespace mpl = boost::mpl; namespace msm = boost::msm; using namespace msm::front; struct Event { Event(bool data) : data(data) { } bool data; }; struct state_ : public msm::front::state_machine_def<state_> { struct MyGuard { template <class EVT, class FSM, class SourceState, class TargetState> bool operator()(EVT const& e, FSM&, SourceState&, TargetState&) { return e.data; } }; struct State1 : public msm::front::state<> { // optional entry/exit methods template <class Event,class FSM> void on_entry(Event const&, FSM& f) { std::cout << "entering: State1" << std::endl; } template <class Event,class FSM> void on_exit(Event const&,FSM& ) { std::cout << "leaving: State1" << std::endl; } }; struct State2 : public msm::front::state<> { // optional entry/exit methods template <class Event,class FSM> void on_entry(Event const&, FSM& f) { std::cout << "entering: State2" << std::endl; } template <class Event,class FSM> void on_exit(Event const&,FSM& ) { std::cout << "leaving: State2" << std::endl; } }; typedef State1 initial_state; struct transition_table : mpl::vector< Row< State1, Event , State2, none, MyGuard > > {}; template <class FSM, class Event> void no_transition(Event const& e, FSM&, int state) { std::cout << "no transition from state " << state << " on event " << typeid(e).name() << std::endl; } }; typedef msm::back::state_machine<state_> State; int main() { State state; state.start(); state.process_event(Event(false)); return 0; }

2 2

[Locale] MinGW + ICU + cross compiling = wchar errors?
by Jookia 13 Nov '12

13 Nov '12

Hello! I'm trying to compile Boost.Locale 1.51.0 with ICU 1.50 support in x86_64 MinGW-w64 4.7.2. So to start off, I have a structure of all my libs, includes and whatnot at /home/jookia/Programming/mingw64. I've built ICU using this command and installed it: CXXFLAGS=-fpermissive ../configure --prefix=/home/jookia/Programming/mingw64/ --host x86_64-w64-mingw32 --with-cross-build=/home/jookia/Programming/local/icu/source/build --enable-static --enable-shared --with-data-packaging=archive --with-library-bits=64 Building Boost uses this user-config: using gcc : 4.7 : x86_64-w64-mingw32-g++ : <rc>x86_64-w64-mingw32-windres <archiver>x86_64-w64-mingw32-ar <compileflags>-I/home/jookia/Programming/mingw64/include/ <linkflags>-L/home/jookia/Programming/mingw64/lib/ ; and this command: bjam threadapi=win32 target-os=windows variant=release threading=multi link=shared runtime-link=shared --prefix=/home/jookia/Programming/mingw64 --user-config=user-config.jam --without-python --without-mpi --layout=tagged -sNO_BZIP=1 -sNO_ZLIB=1 install In order to try and build Boost.Locale I've patched its Jamfile to remove the shared libstdc++ stuff as MinGW doesn't seem to support it, and also rename all of the searched-lib <name>s to their MSVC equivalents so I can find those. The command it used to build is this (stuff omitted to save space): "x86_64-w64-mingw32-g++" "-Wl,--out-implib,bin.v2/libs/locale/build/.../libboost_locale-mt.dll.a" -o "bin.v2/libs/locale/build/.../libboost_locale-mt.dll" -Wl,-h -Wl,libboost_locale-mt.dll -shared -Wl,--start-group ... -Wl,-Bstatic -Wl,-Bdynamic -licuuc -licuin -licudt -liconv -Wl,--end-group -L/home/jookia/Programming/mingw64/lib/ -mthreads Compiling works fine up until linking, where it gives a few errors like this (paths and mangled names omitted to save sapce): bin.v2/.../formatter.o:formatter.cpp:(... undefined reference to `icu_50::UnicodeString::UnicodeString(wchar_t const*, int)' Is there any solution to this or is this something to do with MinGW's lack of support for wchars? Thanks, Jookia.

1 1

boost::variant compile error
by Georg.Kellerer＠lfu.bayern.de 13 Nov '12

13 Nov '12

Hi, i'd like to build a heterogenous container based on the boost::variant datastructure. My code looks like this: // forward-Deklarationen: class fExport FB_Ordered; class fExport FB_Dictionary; // Typedefs typedef boost::variant<int, std::string> keydicttype; typedef boost::variant< int, std::string, date, ptime, boost::recursive_wrapper<FB_Dictionary>, boost::recursive_wrapper<FB_Ordered>> valuedicttype; typedef boost::container::map<keydicttype, valuedicttype> basedict; C:\dev\boost_1_52_0\boost/checked_delete.hpp(32) : error C2027: use of undefined Type "FB_Ordered" what i want to do is to create a container fb_dictionary which can hold datatypes that are listed in the valuedicttype and which can accept keyvalues of int and string (see above). fb_ordered is another container defined in a diferent header file so i need the forward declarations. Could anybody please give me a hint in the right direction? I am using vs2008. Thanks for help, Georg

3 3

Threading and Asio
by Gonzalo Garramuno 12 Nov '12

12 Nov '12

I started playing with asio server/client model and I run into a problem. I have a thread for the server, another for the client and another for the send/receive message. This results in: write: Socket operation on non-socket as the send thread is not made aware of the socket initialized in the client thread. I'm wondering what is the solution to have the send in a separate thread.

2 1

[statechart] history not saved
by Ilya Orlov 11 Nov '12

11 Nov '12

I have following code: // from A11 and A12 and back struct Ev1 : sc::event < Ev1 >{}; struct Ev2 : sc::event < Ev2 >{}; // from A to B and back struct Ev3 : sc::event < Ev3 >{}; struct Ev4 : sc::event < Ev4 >{}; // from A1 to A2 and back struct Ev5 : sc::event < Ev5 >{}; struct Ev6 : sc::event < Ev6 >{}; struct StateA; struct StateA1; struct StateA11; struct StateA12; struct StateA2; struct StateA21; struct StateA22; struct StateB; struct Machine : sc::state_machine < Machine, StateA > {}; struct StateA : sc::simple_state < StateA, Machine, mpl::list < sc::deep_history < StateA1 > >, sc::has_deep_history > { typedef sc::transition < Ev3, StateB > reactions; }; struct StateA1 : sc::simple_state < StateA1, StateA, mpl::list < sc::deep_history < StateA11 > >, sc::has_deep_history > { typedef sc::transition < Ev5, StateA2 > reactions; }; struct StateA11 : sc::simple_state < StateA11, StateA1 > { typedef sc::transition < Ev1, StateA12 > reactions; }; struct StateA12 : sc::simple_state < StateA12, StateA1 > { typedef sc::transition < Ev2, StateA11 > reactions; }; struct StateA2 : sc::simple_state < StateA2, StateA, mpl::list < sc::deep_history < StateA21 > >, sc::has_deep_history > { typedef sc::transition < Ev6, StateA1 > reactions; }; struct StateA21 : sc::simple_state < StateA21, StateA2 > {}; struct StateA22 : sc::simple_state < StateA22, StateA2 > {}; struct StateB : sc::simple_state < StateB, Machine > { typedef sc::custom_reaction < Ev4 > reactions; sc::result react(const Ev4&) { std::cout << "react" << std::endl; return transit < sc::deep_history < StateA11 > >(); } }; I am sending events like this: Machine m; m.initiate(); std::cout << "Ev5" << std::endl; m.process_event(Ev5()); std::cout << "Ev3" << std::endl; m.process_event(Ev3()); std::cout << "Ev4" << std::endl; m.process_event(Ev4()); After Ev5 machine goes to A2 -> A21 state. After Ev3 machine leaves state A with history and goes to state B. After Ev4 machine leaves state B and should go back to A2 -> A21 but actually goes to A -> A1 -> A11 - default states. How I can fix it? Thanks, Ilya

2 6

Review Wizard Report for November 2012
by Ronald Garcia 11 Nov '12

11 Nov '12

============================================== Review Wizard Status Report for November 2012 ============================================== News ==== 1. ODEInt Reviewed 2. Boost 1.52.0 Released. No New Libraries. Open Issues =========== The following libraries have review managers, but have not yet been scheduled for review: * Range Extensions - added May 2012; review manager: Neil Groves. The following libraries have been reviewed and await reports from their review managers: * Predef - reviewed February 2012; review manager: Joel Falcou. * Coroutine - reviewed September 2012; review manager: Hartmut Kaiser. The following libraries have been accepted to Boost, but have not yet been submitted to SVN: * Constrained Value - accepted September 2010; author: Robert Kawulak. * GIL.IO - accepted January 2011; author: Christian Henning. * Contract - accepted September 2012; author: Lorenzo Caminiti. The following libraries have been accepted and submitted to SVN, but have not yet appeared in a release: * Atomic - accepted July 2011; author Helge Bahmann. * Type Traits Introspection - accepted August 2011; author: Edward Diener. * Lockfree - accepted August 2011; author: Tim Blechmann. The following libraries have been accepted provisionally to Boost, but have not been submitted for mini-review and full acceptance: * Endian - accepted provisionally November 2011; author: Beman Dawes. * Log - accepted provisionally March 2010; author: Andrey Semashev. General Announcements ===================== As always, we need experienced review managers. Please take a look at the list of libraries in need of managers and check out their descriptions. In general review managers are active boost participants, including library contributors, infrastructure contributors, and other mailing list participants with a substantial track record of constructive participation. If you can serve as review manager for any of them, email Ron Garcia or John Phillips, "rxg at cs dot cmu dot edu" and "phillips at pacific dot mps dot ohio-state dot edu" respectively. We are also suffering from a lack of reviewers. While we all understand time pressures and the need to complete paying work, the strength of Boost is based on the detailed and informed reviews submitted by you. If you are interested in reviewing a library but won't have time during the review period, you can always prepare your review ahead of time. No rule says you can only work on a review during the review period. A link to this report will be posted to www.boost.org. If you would like us to make any modifications or additions to this report, please email Ron or John. The review schedule is an unordered list of the libraries awaiting review. As such, any library on the schedule can be reviewed once the developer is ready, a review manager has been secured, and the manager, developer, and wizards agree on a date to schedule the review. Review Schedule =============== * Join (M) * Pimpl (M) * Sorting (M) * Quaternions, Vectors, Matrices (M) * Variadic Macro Data (M) * Block Pointer (M) * Singularity (M) * Extended Complex Numbers (M) * Metaparse (M) * Polygon: Voronoi Extensions * Coroutine * Range Extensions * Nowide (M) * Array (M) * TypeIndex (M) * STL Extensions (M) ``(M)`` marks libraries that need review managers. -------------------- Join ---- :Author: Yigong Liu :Review Manager: Needed :Download: http://channel.sourceforge.net/ :Description: Join is an asynchronous, message based C++ concurrency library based on join calculus. It is applicable both to multi-threaded applications and to the orchestration of asynchronous, event-based applications. It follows Comega's design and implementation and builds with Boost facilities. It provides a high level concurrency API with asynchronous methods, synchronous methods, and chords which are "join-patterns" defining the synchronization, asynchrony, and concurrency. Pimpl ----- :Author: Vladimir Batov :Review Manager: Needed :Download: https://github.com/boost-vault/Miscellaneous/blob/master/Pimpl.zip :Description: The Pimpl idiom is a simple yet robust technique to minimize coupling via the separation of interface and implementation and then implementation hiding. This library provides a convenient yet flexible and generic deployment technique for the Pimpl idiom. It's seemingly complete and broadly applicable, yet minimal, simple and pleasant to use. Sorting ------- :Author: Steven Ross :Review Manager: Needed :Download: https://github.com/boost-vault/Sorting :Description: A grouping of 3 templated hybrid radix/comparison-based sorting algorithms that provide superior worst-case and average-case performance to std::sort: integer_sort, which sorts fixed-size data types that support a rightshift (default of >>) and a comparison (default of <) operator. float_sort, which sorts standard floating-point numbers by safely casting them to integers. string_sort, which sorts variable-length data types, and is optimized for 8-bit character strings. All 3 algorithms have O(n(k/s + s)) runtime where k is the number of bits in the data type and s is a constant, and limited memory overhead (in the kB for realistic inputs). In testing, integer_sort varies from 35% faster to 2X as fast as std::sort, depending on processor, compiler optimizations, and data distribution. float_sort is roughly 70% faster than std::sort. string_sort is roughly 2X as fast as std::sort. Quaternions, Vectors, Matrices ------------------------------ :Author: Emil Dotchevski :Review Manager: Needed :Download: http://www.revergestudios.com/boost-qvm/ :Description: QVM defines a set of generic functions and operator overloads for working with quaternions, vectors and matrices of static size. The library also defines vector and matrix data types, however it allows users to introduce their own types by specializing the q_traits, v_traits and m_traits templates. Variadic Macro Data ------------------- :Author: Edward Diener :Review Manager: Needed :Download: `Boost Sandbox <http://svn.boost.org/svn/boost/sandbox/variadic_macro_data/>`__ :Description: This library adds support and functionality for variadic macros to Boost as well as integrating variadic macros with the Boost PP library without changing the latter library in any way. Block Pointer ------------- :Author: Phil Bouchard :Review Manager: Needed :Download: https://svn.boost.org/svn/boost/sandbox/block_ptr/ :Description: Deterministic memory manager of constant complexity capable of handling cyclic collections. Singularity ----------- :Author: Ben Robinson :Review Manager: Needed :Download: https://github.com/cppmaven/Singularity :Description: The Singularity Design Pattern allows you to restrict any class to a single instance. Unlike the infamous Singleton, Singularity gives you direct control over the lifetime of the object, does not require you to grant global access to the object, nor does it limit you to the default constructor for that object. Extended Complex Numbers ------------------------ :Author: Matthieu Schaller :Review Manager: Needed :Download: http://code.google.com/p/cpp-imaginary-numbers/ :Description: The library is an extension of the std::complex class addressing two issues: 1. The standard does not guaranty the behaviour of the complex class if instantiated with types other than float/double/long double. 2. Some calculation where pure imaginary numbers (i.e. multiples of sqrt(-1)) appear are unnecessarily slowed down due to the lack of support for these numbers. The code I submit contains two interleaved classes boost::complex and boost::imaginary which can be instantiated with any type T provided T overloads the usual arithmetic operators and some basic (real) mathematical functions depending on which complex function will be used. It is thus an extended version of Thorsten Ottosen's n1869 proposal (http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1869.html) Metaparse --------- :Author: Abel Sinkovics :Review Manager: Needed :Download: http://abel.web.elte.hu/metaparse/metaparse.zip :Description: Metaparse is a library for constructing parsers parsing at compile-time based on template metaprogramming. The parsers built with the library take boost::mpl::strings as input and can produce - types - objects (types with public static members) - callable C++ functions (types with public static method) - template metafunction classes as output (based on the input being parsed). On compilers supporting constexpr the library provides the following syntactic sugar for writing the input of the parsers: BOOST_STRING("this is a string") The library can be used for implementing DSLs in C++, including DSLs making C++ template metaprogramming easier (see examples). Polygon: Voronoi Extensions --------------------------- :Author: Andril Sydorchuk :Review Manager: Lucanus Simonson :Download: http://svn.boost.org/svn/boost/sandbox/gtl/ :Description: This library extends Boost.Polygon with the following features: - Robust and efficient implementation of the sweepline algorithm that allows to construct Voronoi diagram, Delaunay triangulation and medial axis of a set of points and line segments. - Coordinates of the output geometries are computed within the 64 machine epsilon relative error (6 mantissa bits). - Voronoi diagram data structure that allows efficient traversal and data association with the output Voronoi graph. - No 3rd party dependencies (e.g. GMP, MPFR), all the required multiple precision types are implemented as part of the library. - The input and output coordinate type domains are configurable via coordinate type traits, thus allowing to compute coordinates of the Voronoi vertices within any required precision. - The full construction of the Voronoi diagram of 100 000 points takes only 0.27 seconds (see benchmarks). Coroutine --------- :Author: Oliver Kowalke :Review Manager: Hartmut Kaiser :Download: http://gitorious.org/boost-dev/boost-dev/archive-tarball/coroutine :Description: This library is an implementation of coroutines and generators using Boost.Context. Range Extensions ---------------- :Author: Akira Takahashi :Review Manager: Neil Groves :Download: https://github.com/faithandbrave/OvenToBoost :Description: This project adds some features of the Oven Range Library to Boost.Range. Features: - Additional Range Adaptors (taken, taken_while, dropped, dropped_while, elements, elements_key, memoized, outdirected) - Extensions for using Lambda (regular function, regular operator) - Infinite Range (iteration function) - and additional range utilities. Nowide ------ :Author: Artyom Beilis :Review Manager: Needed :Download: http://cppcms.com/files/nowide/ :Description: This library makes cross platform Unicode aware programming easier. It provides an implementation of standard C and C++ library functions, such that their inputs are UTF-8 aware on Windows without requiring to use Wide API. Array ----- :Author: Brian Smith :Review Manager: Needed :Download: https://github.com/BrianJSmith/Array :Description: The array class is a C++11 compatible implementation of static multidimensional arrays. TypeIndex --------- :Author: Antony Polukhin :Review Manager: Needed :Download: https://github.com/apolukhin/type_index :Description: TypeIndex is an extended C++11 type_index library, that * works with disabled RTTI * can store const-volatile-reference info about types (if user requested it) * has all the functionality of std::type_index * has portable across compilers and platforms functionality for getting demangled type names * works across modules/shared libraries * does not require C++11 to work STL Extensions -------------- :Author: Vadim Stadnik :Review Manager: Needed :Download: https://github.com/vstadnik/stl_ext_adv_review :Description: The proposed library [stl_ext_adv] offers augmented array based B+ trees and STL containers that support the interfaces of the C++03 sequences and associative containers. The library offers a number of extensions and performance improvements that are not available in C++03 and C++11 standard containers. Libraries under development =========================== See http://svn.boost.org/trac/boost/wiki/LibrariesUnderConstruction for a current listing of libraries under development.

1 0

smart_ptr/enable_shared_from_raw
by Andreas Beisler 09 Nov '12

09 Nov '12

Hi, it's known that calling shared_from_this() in a constructor doesn't work. It seems that whenever this issue arises, people resort to creating a factory that first constructs the object and then calls an init function in which the user is free to call shared_from_this(). It seems though that there is a perfectly working enable_shared_from_raw class in the trunk since a couple of years now that allows the developer to call shared_from_raw(this) in a constructor. Are there plans of merging this into a release sometime? If not, is it safe to throw out the smart_ptr stuff of a release (I'm using 1.48.0 still) and replace it with the version from the trunk? Thanks, Andreas

1 0

Boost::Asio help for viewer
by Gonzalo Garramuno 09 Nov '12

09 Nov '12

I am designing a viewer that communicates via the network some actions, like playback, scrubbing, etc. I decided to code it with boost::asio, but I am too unfamiliar with it and the examples did not help much. What I need is the following: - server starts a group - one client connects to server - server and client do several handshake transmissions to sync (same movie file, etc). - client or server perform a playback or a seek to certain frame and the other (client or server) follows. Can someone suggest what should I use and what steps to take in draft form? Currently I have two threads one for the server and one for the client but lack knowledge of the asio api on how to perform a handshake (a send/receive pair, basically).

3 4

boost asio: boost::asio::deadline_timer blocking ?
by Avi Bahra 09 Nov '12

09 Nov '12

Using boost asio 1.47, suse linux 11.3, gcc 4.5 I am using boost::asio::deadline_timer, where the timer fires every second. When the timer expires, I check responses from the clients. I use the same timer to check when I have reach the minute boundary, so that server can do some other work. Now 99.9% of the time this works perfectly. However occasionally the timer does not fire every second, in fact it can delay/block for several minutes! This is what I use: timer_.expires_from_now( boost::posix_time::seconds( 1 ) ); timer_.async_wait( server_->io_service_.wrap( boost::bind( &NodeTreeTraverser::traverse,this,boost::asio::placeholders::error ) ) ); When I run strace on the process I see: epoll_wait(4, {{EPOLLIN, {u32=15957244, u64=15957244}}}, 128, 4294967295) = 1 timerfd_settime(5, 0, {it_interval={0, 0}, it_value={16, 944525000}}, {it_interval={16048400, 15957984}, it_value={140733847085872, 6025966}}) = 0 timerfd_settime(5, 0, {it_interval={0, 0}, it_value={0, 999992000}}, {it_interval={15958092, 6011901}, it_value={17195917584, 140733847086024}}) = 0 I have several questions: o Are there known problems with boost::asio::deadline_timer accuracy I realise I need soft real time, with one minute resolution. o Should I have two separate timers, one 1 second & for 1 minute o Is using timer_.expires_at(...) more reliable, I assume this affects how it configures timerfd_settime o Now I suspect this issue may be related to slow disk system Could a slow disk system affect timerfd_settime system call, since it is based on file descriptors. o Are there any well known asio based design patterns/idioms for ensuring reliable timer resolutions Any help appreciated. Ta, Avi

2 1

[thread] thread.join() throws in 1.52.0
by Szymon Gatner 09 Nov '12

09 Nov '12

Hi, after updating from 1.51.0 to 1.52.0 call to a thread::join() throws "invalid_argument" / not joinable. I see that there is a change with regards to thread d-tor in this version but I don't really understand if and why this is related. Should joinable() be called now before every join()? -- Szymon Gatner The Lordz Games Studio www.thelordzgamesstudio.com

3 7

Unit Test Framework Static library compilation
by Edouard Tallent 08 Nov '12

08 Nov '12

Hi all. This is Boost 1.52.0 and Visual Studio 2012 Express (VC11). I am stuck with the static compilation of the Unit Test Framework, as documented here: http://www.boost.org/doc/libs/1_52_0/libs/test/doc/html/utf/compilation/sta… I get the message 'bjam' is not recognized as an internal or external command, operable program or batch file while using the command bjam [-sTOOLS=] {-sBUILD=boost_unit_test_framework} as read in the documentation. Boost is not installed on my computer (header-only). And, maybe the library Boost.build HAS to be installed first? (if it so, how do I do that?) That would be great if someone give a clear explanation of that. Thank you very much, indeed. Édouard -- http://quantcorner.wordpress.com

3 3

[Boost units] Derived units for specific_heat_capacity
by A Andrew 08 Nov '12

08 Nov '12

2 2

ptr_map<U, T> with polymorphic U
by Victor Snyder 08 Nov '12

08 Nov '12

ptr_map<U, T> lets me map simple types to pointers-to-T, preserving polymorphic behavior of the mapped-to objects, and clearly stating that the ptr_map solely owns the pointed-to objects. I'd like to map pointers-to-U to pointers-to-T and have the map solely own the key objects as well as the mapped-to objects. ptr_map doesn't do this. I could map shared_ptrs-to-U to pointers-to-T, but then I lose the clear ownership semantics. Does anyone know of an easy workaround to get the behavior and semantics that I want, or is this more properly a feature request? Thanks!

2 2

pattern support for traversing inheritance chain
by Brian Budge 07 Nov '12

07 Nov '12

Hi all - I have a case where I have a largeish inheritance hierarchy. I will be calling an initialization function on all objects before using them in some fashion. Basically what I need to happen is when I call init() on a Foo the following would occur: void Foo::init() { super::init(); // now with the knowledge that anything I inherited is set up, I can set myself up... } It is not necessary for every call to implement init, in which case the behavior should be that the call is propagated up the inheritance chain (which it is by default in C++). In order to make this work, I need to write different code for "super" in every class implementation, which is a bit error prone. Even if I don't copy/paste, my brain might be on autopilot and type something further up the inheritance chain than it should be. Alternatively, I could require that each class provides a typedef for super, but I'm still relying on myself to remember to call super's init function. Is there anything in boost that would support this kind of hierarchy traversal (semi-)automatically? If there is not, are there suggestions for ways to implement this in a less error-prone fashion? Thanks, Brian

3 5

[1.52] PDF Documentation build available
by John Maddock 07 Nov '12

07 Nov '12

The PDF build of Boost docs is now available for 1.52 from: https://sourceforge.net/projects/boost/files/boost-docs/1.52.0/ John.

1 0

Virtual memory exhausted compile error with too many Boost state machine transitions
by Adlai Shawareb 06 Nov '12

06 Nov '12

All, We are getting the virtual memory exhausted error when compiling a Boost state machine file. If we cut back the number of state transitions in this state machine, we do not get the error, and the compile completes without errors. We are using Boost 1.49. Here is what we have done: 1) Allocated 4GB of memory to our Virtual Machine(it runs Ubuntu), and created a 4.5GB swap file. When I compile I look at the System Monitor dialog, and can see that the RAM memory is not even used up when we get the compile error. The virtual memory is never used. 2) I saw online that the 3.80 version of make had a bug that would cause this type of error. I've confirmed that we are using 3.81. I also tried 3.82, but get the same error. 3) I've confirmed that "ulimit -v" returns "unlimited" 4) Looking online, I saw a recommendation to add the following two lines to /etc/security/limits.conf. I've tried this but I still get the error. * hard rss unlimited * hard cpu unlimited 1) 2) 3) 4) 5) We have set up precompiled headers, and I've added SystemHSM.hpp, and associated Boost include files to our list of precompiled headers. However, I still get the error. 6) FYI - In the past we ran up against Boost's limit of 20 state transitions per state machine. To get around that, I've added the following to SystemHSM.cpp: #define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS // Discard the pre-generated headers and use preprocessor metaprogramming techniques to generate the necessary versions of the library components on the fly. #define BOOST_MPL_LIMIT_VECTOR_SIZE 50 // Increase the default (transition table) vector size beyond the standard limit of 20. #include <boost/mpl/vector.hpp> 1) 2) 3) 4) 5) 6) 7) FYI - We recently ran into an issue with the set size in the SystemHSM #define BOOST_FUSION_DONT_USE_PREPROCESSED_FILES #define FUSION_MAX_VECTOR_SIZE 30 #define FUSION_MAX_SET_SIZE 30 #include <boost/mpl/set.hpp> In addition I have looked for this type of error with gcc, but have not found anything concrete online. Any help would be appreciated!

1 0

Known way to handle this?
by Lemay.Steve 06 Nov '12

06 Nov '12

Is there already a known [proper] way to correct his issue (shown below)? I had reported it during the beta - this occurs many times for various source. "QCC" -Wc,-ftemplate-depth-128 -DFD_SETSIZE=2048 -march=k8-sse3 -mtune=k8-sse3 -mmmx -msse3 -mfpmath=sse -mno-3dnow -mstackrealign -Y_cpp -Wc,-fPIC,-fnothrow-opt,-std=c++11,-std=gnu++11 -O3 -Wc,-finline-functions -Wc,-Wno-inline -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "D:\boostBuild_QCC_1_52_0\boost\bin.v2\libs\serialization\build\qcc\release\link-static\target-os-qnxnto\threadapi-pthread\threading-multi\xml_iarchive.o" "libs\serialization\src\xml_iarchive.cpp" ...failed qcc.compile.c++ D:\boostBuild_QCC_1_52_0\boost\bin.v2\libs\serialization\build\qcc\release\link-static\target-os-qnxnto\threadapi-pthread\threading-multi\xml_iarchive.o... qcc.compile.c++ D:\boostBuild_QCC_1_52_0\boost\bin.v2\libs\serialization\build\qcc\release\link-static\target-os-qnxnto\threadapi-pthread\threading-multi\xml_archive_exception.o In file included from libs\serialization\src\xml_archive_exception.cpp:21:0: ./boost/archive/xml_archive_exception.hpp:35:44: error: looser throw specifier for 'virtual boost::archive::xml_archive_exception::~xml_archive_exception()' In file included from ./boost/archive/xml_archive_exception.hpp:25:0, from libs\serialization\src\xml_archive_exception.cpp:21: ./boost/archive/archive_exception.hpp:86:5: error: overriding 'virtual boost::archive::archive_exception::~archive_exception() throw ()' cc: d:/qnxsdk/qnxsdk6.5-001/host/win32/x86/usr/lib/gcc/i486-pc-nto-qnx6.5.0/4.7.2/cc1plus caught signal 1 Steven LeMay Game Platform Engineering International Game Technology 9295 Prototype Way Reno, NV 89521 Office: +1 775.448.8089 Mobile: +1 775.813.6676 steven.lemay(a)igt.com<mailto:steven.lemay@igt.com> This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. Any humorous implications are purely the result of misinterpretations provided by the reader.

2 2

Question about boost::locale translations
by Bastien Montagne 06 Nov '12

06 Nov '12

Hi everybody! :) I’m currently trying to replace libintl (from gnu gettext) by boost::locale lib, in a (mostly) C program (blender, actually). To do so, I wrote a simplistic wrapper: #include <boost/locale.hpp> #include "boost_locale_wrapper.h" static boost::locale::generator gen; /* Called only once */ void boost_locale_init(const char *messages_path, const char *default_domain) { gen.add_messages_path(messages_path); gen.add_messages_domain(default_domain); gen.set_default_messages_domain(default_domain); } /* Called each time you change locale */ void boost_locale_set(const char *locale) { if (locale && locale[0]) { std::locale::global(gen(locale)); } else { std::locale::global(gen("")); } } const char* boost_locale_gettext(const char *msgid) { return boost::locale::gettext(msgid).c_str(); } (this wrapper lib is linked statically with the main app) But I'm facing a big problem: I would expect strings returned by boost::locale::gettext & co to be "const", i.e. that the char pointer gotten by boost::locale::gettext(msgid).c_str() would be const (and unique to a given locale/msgid/context/etc.), as it is with gnu gettext. But this is obviously not the case, as demonstrated by those prints (translated_msgid (address)): Serbe latin (Srpski latinica) (0x7fcaed0dac58) sr_RS@latin (0x7fcaee1e5628) Suédois (Svenska) (0x7fcaed0dac58) sv_SE (0x7fcaee1e5628) Am I missing something obvious here, or are returned string just not "const"? If so, how can a code like: MessageBoxW(0,pgettext <http://www.boost.org/doc/libs/1_49_0/libs/locale/doc/html/group__message.ht…>(L"File Dialog",L"Open?").c_str(),gettext <http://www.boost.org/doc/libs/1_49_0/libs/locale/doc/html/group__message.ht…>(L"Question").c_str(),MB_YESNO); (taken from boost doc) could work? I'm quite new to all this C++2C stuff (and to boost too), so please forgive me if this is a noob question... Best regards, Bastien

3 5

Re: [Boost-users] Is this possible with boost? Linear Interpolation?
by rakesh patil 06 Nov '12

06 Nov '12

Hey Joel, Thanks for your quick reply. I check those links. If I am not mis-understood, that library can be used to compute intermediate values for a given range. In my case it is a polyline. The track of polyline must be maintained properly. The topology must not change here. Even if it changes, the change must not be a major one. So this one won't be of much use as of now. And before posting the question I checked Boost.Geometry. But I didn't find what I want. Any other possibilities other than writing my own code to do this? Thanks Regards

1 0

Worth reporting warnings for 1.52?
by Lemay.Steve 06 Nov '12

06 Nov '12

I know the documentation says to expect warnings during compilation. So, are these boost 1.52 warnings worth reporting? Or are they typically tolerated? (gnu 4.7.2 C++11 enabled) Line 27367: ./boost/regex/v4/cpp_regex_traits.hpp:1069:34: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] Line 27372: libs\regex\build\..\src\regex.cpp:195:64: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] Line 27403: ./boost/regex/pending/object_cache.hpp:64:37: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] Line 27429: ./boost/regex/v4/regex_traits_defaults.hpp:329:73: warning: narrowing conversion of ''\37777777605'' from 'char' to 'const wchar_t' inside { } [-Wnarrowing] Line 27430: ./boost/regex/v4/regex_traits_defaults.hpp:331:64: warning: narrowing conversion of ''\37777777605'' from 'char' to 'const wchar_t' inside { } [-Wnarrowing] Line 27751: libs\thread\src\pthread\once.cpp:18:60: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] Line 27752: libs\thread\src\pthread\once.cpp:24:47: warning: narrowing conversion of '2147483648u' from 'unsigned int' to 'int' inside { } [-Wnarrowing] In file included from ./boost/regex/v4/regex_traits.hpp:39:0, from ./boost/regex/regex_traits.hpp:27, from ./boost/regex/v4/regex.hpp:39, from ./boost/regex.hpp:31, from libs\regex\build\..\src\winstances.cpp:30: ./boost/regex/v4/cpp_regex_traits.hpp: In instantiation of 'boost::re_detail::parser_buf<charT, traits>::pos_type boost::re_detail::parser_buf<charT, traits>::seekoff(boost::re_detail::parser_buf<charT, traits>::off_type, std::_Iosb<int>::seekdir, std::_Iosb<int>::openmode) [with charT = wchar_t; traits = std::char_traits<wchar_t>; boost::re_detail::parser_buf<charT, traits>::pos_type = std::fpos<_Mbstatet>; boost::re_detail::parser_buf<charT, traits>::off_type = long int; std::_Iosb<int>::seekdir = std::_Iosb<int>::_Seekdir; std::_Iosb<int>::openmode = std::_Iosb<int>::_Openmode]': ./boost/regex/v4/regex_split.hpp:168:1: required from here ./boost/regex/v4/cpp_regex_traits.hpp:117:4: warning: case value '0' not in enumerated type 'std::_Iosb<int>::seekdir {aka std::_Iosb<int>::_Seekdir}' [-Wswitch] ./boost/regex/v4/cpp_regex_traits.hpp:129:4: warning: case value '1' not in enumerated type 'std::_Iosb<int>::seekdir {aka std::_Iosb<int>::_Seekdir}' [-Wswitch] ./boost/regex/v4/cpp_regex_traits.hpp:123:4: warning: case value '2' not in enumerated type 'std::_Iosb<int>::seekdir {aka std::_Iosb<int>::_Seekdir}' [-Wswitch] Steven LeMay Game Platform Engineering International Game Technology 9295 Prototype Way Reno, NV 89521 Office: +1 775.448.8089 Mobile: +1 775.813.6676 steven.lemay(a)igt.com<mailto:steven.lemay@igt.com> This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. Any humorous implications are purely the result of misinterpretations provided by the reader.

2 1

Is this possible with boost? Linear Interpolation?
by rakesh patil 06 Nov '12

06 Nov '12

Hello, I have a set of xy points(forms a polyline). What I want to do is, with the help of existing set of points, I need to redistribute the number of points such that the first and last point remain is same position. The intermediate points will change. For example, initally I have set of 10 points. I want to redistribute this polyline containing 10 points into 40 points. But the first and last point must remain as it is. Internal points may be adjusted. I guess interpolation should be used for this. What I want to know is that whether this is possible to do using boost c++ library? Thanks Regards

2 1

[Boost.Test] Test Ordering?
by John M. Dlugosz 06 Nov '12

06 Nov '12

If I make unit*test*s in different source files, I need to declare a BOOST_AUTO_*TEST*_SUITEin each one, right? At link time, these appear in some undetermined order. How can I cause them to be run in the desired order instead?

3 3

On Windows, how does Boost decide which MSVS version to use, if I have more than one installed?
by Ramon F Herrera 05 Nov '12

05 Nov '12

When I tried to build some app, I ended up with this error message: 1>LINK : fatal error LNK1104: cannot open file 'libboost_filesystem-vc80-mt-1_51.lib' I am sure it is due to the fact that I have a couple of Boost installations and 2 Versions of MSVS as well (2005 and 2010). NB: This is the way I build Boost on Windows: .\bootstrap.bat .\bjam.exe --with-date_time --with-filesystem --with-regex --with-system --stagedir=. --build-type=complete toolset=msvc The question is about that last parameter above. Does the install procedure: (a) Go to "Program Files" and takes a look at the name of the highest numbered MSVS folder? or (b) Is this info extracted from the Registry or something? TIA, -Ramon

2 1

Boost 1.52.0 released!
by Marshall Clow 05 Nov '12

05 Nov '12

Release 1.52.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains numerous enhancements and bug fixes for existing libraries. For details, including download links, see http://www.boost.org/users/news/version_1_52_0 You can also download directly from SourceForge: http://sourceforge.net/projects/boost/files/boost/1.52.0/ To install this release on your system, see http://www.boost.org/doc/libs/release/more/getting_started/index.html Thanks, --The Boost release team Beman Dawes Daniel James Eric Niebler Marshall Clow Rene Rivera Vladimir Prus

3 2

Linking problems with boost serialization and MinGW
by Florian Burkart 05 Nov '12

05 Nov '12

Hi, I am having a bit of trouble linking to boost serialization with MinGW. If I don't include -lboost_serialization-mgw46-mt-d-1_50 I get loads of undefined references, however, if I do include it, most disappear but I still get some, namely I get RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_14object_id_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_21object_reference_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_13class_id_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_23class_id_reference_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o): In function `ZN5boost7archive21basic_text_oprimitiveISoE4saveINS0_13tracking_typeEEEvRKT_': /Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: undefined reference to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' RDebug/libFlamLib.a(Common_Collector.o):/Sys/boost/MinGW32/boost_1_50_0/include/boost-1_50/boost/archive/basic_text_oprimitive.hpp:89: more undefined references to `boost::archive::archive_exception::archive_exception(boost::archive::archive_exception::exception_code, char const*, char const*)' follow Basically they all refer to "`boost::archive::archive_exception::archive_exception". boost serialization built fine with .\b2.exe --prefix=c:\Sys\boost\MinGW32\boost_1_50_0 toolset=gcc address-model=32 --with-serialization install The same code compiles and links just fine with gcc on linux and MSVC on windows. I haven't isolate the issue yet, so am afraid can't give a reproducible sample, but any ideas so far? Maybe look familiar? Thanks, Florian

2 3

Symantec Norton shold not longer flag boost_signals-vc100-mt-gd-1_50.dll as suspicious
by Paul A. Bristow 05 Nov '12

05 Nov '12

I was slightly inconvenienced by having the new version of boost_signals-vc100-mt-gd-1_50.dll that I had just built flagged by Norton as suspicious and placed in 'quarantine'. "Name of detection given by Symantec product: suspicious.cloud.7.f" But I was impressed that reporting this to Symantec I got (in 48 hours) this response: "Dispute Submission [2985065] Symantec FP Incident Response falsepositives(a)symantec.com" saying that it was now whitelisted in the daily virus definitions update. Paul PS I have had bjam/b2 also flagged in the past saying it only had five users! --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow(a)hetp.u-net.com

1 0

[range] questions about documentation and usage
by Robert Ramey 05 Nov '12

05 Nov '12

I want to use Boost.Range in a bigger way. But I have a few problems with it. I think most of them are just issues of understanding and the writting of the documentation a) I see examples like std::vector<T> v; boost::range::find(v, 0); find(SinglePassRange& rng, Value val); BUT when looking at the documentation at http://www.boost.org/doc/libs/1_51_0/libs/range/doc/html/range/concepts/sin… I see only two valid expressions boost::begin(a) boost::end(a) where in this case a would be v which is of type std::vector<int>. BUT boost:begin(v) is NOT a valid expression for the above. Spelunking into the range header code reveals the following: template< class T > inline BOOST_DEDUCED_TYPENAME range_iterator<T>::type begin( T& r ) { #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) && \ !BOOST_WORKAROUND(__GNUC__, < 3) \ /**/ using namespace range_detail; #endif return range_begin( r ); } and template< typename C > inline BOOST_DEDUCED_TYPENAME range_iterator<C>::type range_begin( C& c ) { // // If you get a compile-error here, it is most likely because // you have not implemented range_begin() properly in // the namespace of C // return c.begin(); } This effectively means that the "Valid Expressions" for SinglePassRange part of the documenation should read: a.begin() a.end() Doesn't it. I would be interested to know if I got this wrong. b) I see the template iterator_range<ForwardTraversalIterator> - which seem to be to in an instance of what the ForwardRangeConcept should be. To me, the range documentation is out of whack. I can figure it out - but it's misleading - atleast to me. c) Another really annoying thing is that every thing is directly in the boost namespace. This breaks the convention that library headers are in boost/<library name> and in the namespace boost::<library name>. This creates a lot of opportunity for conflict. Robert Ramey

8 38

Debug Assertion with MFC
by Yiğit Çağrı Akkaya 05 Nov '12

05 Nov '12

Hi, I have an MFC application. There are plenty of dll's written by us. In one dll module, we use boost. However, on start up of application, it throws several assertions about loading dll. I know assertions are available only for debug mode, but we want to get rid of every small problem in order to provide a stable release. I made web search and I found this thread: http://lists.boost.org/threads-devel/2009/06/0476.php This belongs to 2009 and Boost 1.39. We use Boost 1.48 and Visual Studio 2008 SP1. Thread says that this happens when MFC application statically linked to boost. Probably, nothing changed up to 1.48 because I found that line and commented it out(extern BOOL (WINAPI * const _pRawDllMain)(HANDLE, DWORD, LPVOID)=&dll_callback;). Is there a macro defined in boost to differentiate static and dynamic builds? If there is a macro, we are planning to wrap macro around that line. Or is there any better solution for this? Thanks in advance...

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[Program_options] Positional options are not parsed, "unrecognised option". A bug?
by Dmitry Shintyakov 04 Nov '12

04 Nov '12

Hello, everybody. I am having problems using Boost::Program_options library. I have a program, that have several optional keyword arguments, and 3 positional arguments. Keyword arguments are parsed well, but positional arguments are always causing an exception? saying: "unrecognised option" After spending 2 hours trying to find a problem, I decided to ask for help. I am using Boost 1.50.0-2, GCC 4.7.2 under Arch linux (32 bit). My example is almost exact copy from the tutorial, so I suspect that there is some bug. Example code (with all non-relevant code removed) follows. To test it, run it as following: ./a.out 123 123 test Expected behaviour is to see a line: Arguments: output=output.png width=123 height=123 Instead, I see this: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail:: error_info_injector<boost::program_options::unknown_option> >' what(): unrecognised option '1' ==Test code== #include <iostream> #include <boost/program_options.hpp> using namespace std; int main( int argc, char * argv[] ) { namespace po = boost::program_options; string output_file; po::options_description desc("converter [options] width height source"); desc.add_options() ("help", "Show help message") ("output,o", po::value<string>( &output_file )->default_value("output.png"), "Output file to put converted image data to. Default is output.png") ; po::positional_options_description pos_desc; pos_desc.add("width",1).add("height",1).add("input-file",1); po::variables_map vm; po::store( po::command_line_parser(argc, argv) .options(desc) .positional(pos_desc) .run() , vm ); po::notify( vm ); if( vm.count("help") ){ cout << desc <<endl; return 0; } if (!vm.count("width") || !vm.count("height") || !vm.count("input-file") ){ cerr<<"Error: width, weight and input file must be specified"<<endl; return 1; } cout << "Arguments: output="<<output_file << " width="<<vm["width"].as<string>() << " height="<<vm["height"].as<string>()<<endl; return 0; }

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MingW compilation errors
by Alice Gamewell 04 Nov '12

04 Nov '12

I have managed to build the boost libraries with b2 and the gcc toolset option. Alas, whenever I use a header which invokes such a library in Code::Blocks chained with MingW I get these errors: undefined reference to _Unwind_SiLj_Register undefined reference to _Unwind_SiLj_Unregister undefined reference to _Unwind_SiLj_Resume undefined reference to __gxx_personality_sj0 undefined reference to _WSACleanup@0 undefined reference to _WSAStartup@8 All but the last two repeatedly. I would really appreciate anyone who could point me out of this mess. Thanks!

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[Date Time] MSVC CRT assertion stops execution in debug mode
by Fumito Hamamura 03 Nov '12

03 Nov '12

Hi, I'm testing the code below using boost 1.50.0 and Visual C++ 2008. What I expected was, the ptime t doesn't throw an exception even though it doesn't get a valid date time string passed by the wstringstream ss. When it is compiled in Release mode, it works as expected, i.e. the program runs without an error, but when compiled in Debug mode, the program stops because debug assertion fails in _chvalidator in isctype.c, which is called by std::isspace. Is there a known workaround for this? Thanks, Fumito ----- #include <iostream> #include <string> #include "boost/date_time/posix_time/posix_time.hpp" int wmain(int argc, wchar_t* argv[]) { boost::posix_time::wtime_input_facet* dt_facet(new boost::posix_time::wtime_input_facet(L"%Y/%m/%d %H:%M")); std::wstringstream ss; boost::posix_time::ptime t; ss.imbue(std::locale(ss.getloc(), dt_facet)); ss << L"あいうえお"; ss >> t; return 0; } -----

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C++ announcements coming tomorrow
by Beman Dawes 03 Nov '12

03 Nov '12

Herb Sutter, the Convenor of the ISO C++ Standards Committee, will be making some announcements tomorrow likely to be of interest to C++ developers in general and Boosters in particular. The venue is a talk titled "The Future of C++" at the Microsoft Build Conference. While some of Herb's announcements will be specific to Microsoft, the key C++ initiatives involve Boost and the whole C++ community. Some of the ideas evolved from feedback Herb got at C++Now/BoostCon 2012 last May. I'll post a summary of the announcements tomorrow, but you can also watch the live stream at http://channel9.msdn.com at 12:45 PM Pacific time. For other time zones, see http://www.timeanddate.com/worldclock/fixedtime.html?iso=20121102T1945 --Beman PS: We don't usually post teasers like this on the Boost lists, but Herb asked that a notice be posted, and given the endless work he has put in on this over the summer, I couldn't say no.

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boost with mingw
by Kraus Philipp 03 Nov '12

03 Nov '12

Hello, I try to build Boost with MinGW / MSYS. I have found in the dokumentation http://www.boost.org/doc/libs/1_51_0/more/getting_started/windows.html that MinGW shell is not supported, but I can build bJam with booststrap.sh --toolset=mingw under the shell, but I get the error: mingw.jam: No such file or directory Can I build boost under MinGW shell or another shell with the MinGW gcc? Thanks Phil

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[Filesystem] Reverse traversal of boost::filesystem::path::const_iterator?
by Nat Linden 02 Nov '12

02 Nov '12

I've stumbled across some code in our code base that wants to walk up a fixed number of containing parent directories from the starting path. (It's in a Mac application bundle nested within another.) boost::filesystem::path::[const_]iterator is described as bidirectional. But boost::filesystem::path has no rbegin() or rend(). In libs/filesystem/test/path_test.cpp's iterator_tests(), I see, for a path variable named itr_ck, use of boost::prior(itr_ck.end()). That suggests that usage of this form would be legal: path mypath = /* ...something... */; for (path::const_iterator rcomp(mypath.end()), rend(mypath.begin()); rcomp != rend; --rcomp) { // ... use boost::prior(rcomp) ... } Am I correct? Given the way some containers implement end(), I always feel nervous about decrementing end(). I'm happy to see that Boost.Filesystem's own tests guarantee that usage; but is there anything in the documentation that would have assured me of that?

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boost::heap::skew_heap(1_51_0) ordered_iterator
by imns70 02 Nov '12

02 Nov '12

Hi This question pertains to boost::heap::skew_heap as defined here:- http://www.boost.org/doc/libs/1_51_0/doc/html/boost/heap/skew_heap.html Can you please help me understand what is the complexity of skew heap traversal using ordered_iterator. I am traversing over the heap, using ordered_iterator as shown in code below :- for(bk_heap::ordered_iterator it=buy_heap->ordered_begin();it!=buy_heap->ordered_end();it++) { /// some code here... } I suspect it to be O(n), but just want to make sure. Thanks in advance. -- View this message in context: http://boost.2283326.n4.nabble.com/boost-heap-skew-heap-1-51-0-ordered-iter… Sent from the Boost - Users mailing list archive at Nabble.com.

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advice with containers and data types
by Georg.Kellerer＠lfu.bayern.de 02 Nov '12

02 Nov '12

Hi all, i am a newbie to boost and hope, somebody here can give me an advice. i want to change the implementation of an existing container class in one of my projects. It is a container which for the moment is based on a very old roguewave version which should be replaced by boost. main features of this container are: - the container is based on a hashmap. - the key datatype can be string or int. - the value data type can be string, int, double, time, date, the container type itself and another container type. I thought about implementing the class based on a map container with boost:any as key and value type. is this possible? Or do you have other and even better recommendations for me? i am a bit confused about the great number of diferent containers and datastructures the boost library offers. Thanks in advance, Georg

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[phoenix] Using with Boost.Function.
by Robert Jones 02 Nov '12

02 Nov '12

Can anyone tell me the correct incantation to get the 'Not OK' lines to work? Thx, Rob. #include <boost/function.hpp> #include <boost/phoenix/core.hpp> #include <boost/phoenix/operator.hpp> #include <boost/phoenix/bind/bind_member_variable.hpp> #include <boost/phoenix/bind/bind_function.hpp> #include <boost/function.hpp> #include <list> struct S { int i; }; void f( std::list<S> & l, int i ) { using boost::phoenix::arg_names::_1; using boost::phoenix::arg_names::_2; // OK l.remove_if( bind( & S::i, _1 ) >= i ); *// Not OK.* * boost::function<bool( int, int )> pred = _1 >= _2;* * l.remove_if( bind( pred, _1, i ) );* }

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Iterator Range, sub range of a desired size
by David Kimmel 02 Nov '12

02 Nov '12

Is there a function in BOOST, given a starting point and a desired size, that returns iterators for a (sub) range? For example, given: a boost::circular_buffer which contains: 1 2 3 4 5 6 7 8 9 10 a starting point which is an iterator pointing to 5 and finally a desired size which is an int s = 4 The result of which would be iterators producing: 5 6 7 8 A possible implementation might be this (but I was hoping there was a BOOST version since I can't find an STD algorithm) template <typename Itr> std::pair<Itr, Itr> getWindowDown(Itr begin, Itr end, Itr start, const int windowSize) { // Down first, then up if need be const Itr bottom = (end - start > windowSize) ? (start + windowSize) : (end); const Itr top = (bottom - begin > windowSize) ? (bottom - windowSize) : (begin); return make_pair(top, bottom); } Thanks, -- View this message in context: http://boost.2283326.n4.nabble.com/Iterator-Range-sub-range-of-a-desired-si… Sent from the Boost - Users mailing list archive at Nabble.com.

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Re: [Boost-users] [Thread] Win32 TLS problem with dynamic libraries
by Sarah Tappon 02 Nov '12

02 Nov '12

On Mon, Oct 29, 2012 at 12:31 AM, Сергей Захарченко wrote: > * Rename the Boost.Thread library into 'original_boost_thread'. > > * Add a custom target named 'patched_boost_thread' which uses dumpbin > and lib utilities to delete just the tss_pe.obj object from Boost.Thread. > > * Add a library called boost_thread which links to 'patched_boost_thread' and > contains a file named tss_pe.cpp which contains the aforementioned code > (essentially it's the 'null tss cleanup implementation'). I've been researching a similar issue and it's useful to hear from someone who has successfully implemented a workaround. A couple of follow-up questions, if you don't mind: Once the solution is in place, what (if anything) do you have to do to ensure that resources are cleaned up appropriately? Is it sufficient to call on_thread_exit() whenever a thread exits? > Assuming that I can guarantee that no Boost.Thread functions > are called from non-Boost.Thread threads, it shouldn't be > needed. Could you give me a concrete example of a call that would violate this guarantee? What happens if you violate it? Thanks, Sarah

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[boost::python] exposing an abstract base class through boost::ptr_vector and the vector indexing suite
by Andy Falanga (afalanga) 01 Nov '12

01 Nov '12

Hi everyone, I have need to expose a couple of different classes which inherit from a single, abstract, C++ class. This abstract class is what I need to expose to python. Using the python wiki, I've figure out the correct way to expose these classes. However, the next dimension to this problem is that my users aren't supposed to be able to instantiate any of the derived classes directly. Instead, they are to use a function which will return a list of these objects. I've been working on the correct implementation for use with boost::ptr_vector. Now, I want to use the vector indexing suite in boost::python to expose these things. I've worked through properly making an assignment overload operator appropriate to this for use with the vector indexing suite. However, I'm stumped at this error: Error 2 error C2440: 'return' : cannot convert from 'Base' to 'Base *' c:\program files\boost\boost_1_47\boost\python\suite\indexing\vector_indexing_suite.hpp 77 Because of this error, I'm wondering if it's not possible, or at least not recommended, to use the vector indexing suite to expose boost::ptr_vectors. Is this true? I'm using Visual Studio 2010 and Boost 1.47. Thanks, Andy

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[serialization] support for C++-11 types
by Marco Craveiro 01 Nov '12

01 Nov '12

Hi boost-users, Apologies if this question has been asked before - I'm sure it has, but my googling-fu is not finding decent matches. Anyways, the question is: with C++11 we have a number of new container types such as std::array, std::underdered_map/set, std::forward_list, etc. Are those supported by the latest release of the serialization library? If not, is there a trac ticket for this work? Many thanks for your time, Marco -- So young, and already so unknown -- Pauli blog: http://mcraveiro.blogspot.com

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bug of boost algorithm library or boost asio?
by kpzhang 01 Nov '12

01 Nov '12

Hi, Apologize if this is not the right place for this mail. This program (it has been narrowed down from a larger program) always crashes after compiled in vs2008 Release(Win32) mode under windows 7. I am not familiar with assembly code and don't know it's a bug of compiler or boost::ends_with or boost::asio::buffers_iterator. It can be compiled and executed with g++ in Ubuntu without any problem. People said it's very unlikely to be compiler's bug, but when compiled in debug moded(or disable optimization), the problem does disappear. I have been stuck with this problem for quite a few hours. Any help is appreciated. Thanks in advance. #include <iostream>#include <string>#include <boost/asio.hpp>#include <boost/algorithm/string.hpp> typedef boost::asio::buffers_iterator<boost::asio::const_buffers_1> iterator_t;typedef boost::iterator_range<iterator_t> range_t;static const std::string LINE_END_MARK = "\r\n"; int main(int argc, char* argv[]){ boost::asio::streambuf _buf; std::ostream os(&_buf); os<<"END\r\n"; iterator_t cursor = boost::asio::buffers_begin(_buf.data()); iterator_t end = boost::asio::buffers_end(_buf.data()); std::ostream_iterator<char> it(std::cout," "); std::copy(LINE_END_MARK.begin(), LINE_END_MARK.end(), it); range_t r(cursor, end); if(!boost::ends_with(r, LINE_END_MARK)) return 0; return 1;}

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