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

unlocatable infinite loop when using boost::serialization
by Griffin Howlett 10 Aug '11

10 Aug '11

Ok so i've set up boost::serialization to work with objects whose constructor and destructors are private (forcing you to make them through "factories"), but after doing the coming steps, the << operator of a boost::oarchive never returns. I've followed what was happening exactly in a debugger, but don't know what's happening *after the ending brackets of the object's serialization function. It's not even reaching the overloaded destroy function*. I think it's some internal business. - To do this i've overided the `load/save_construct_data function` and the `access::destroy template function` with the appropriate parameters. - I also defined a serialization function for each factory-built object, but it doesn't do anything as to force you to pass a pointer instead. - You'll also notice i've added my own Save() function as so the user can specify a different factory to use for recreating (loading) the object back up if needed. **Why would this be happening and how do i fix it?** here's the source: oa << WallBody2; //this is the call in main, wallBody2 is a b2Body* template<> static void access::destroy( const b2Body * t) // const appropriate here? { // the const business is an MSVC 6.0 hack that should be // benign on everything else const_cast<b2Body*>(t)->GetWorld()->DestroyBody(const_cast<b2Body*>(t)); } template<> static void access::destroy( const b2Fixture * t) // const appropriate here? { // the const business is an MSVC 6.0 hack that should be // benign on everything else const_cast<b2Fixture*>(t)->GetBody()->DestroyFixture(const_cast<b2Fixture*>(t)); } template<class Archive> inline void save_construct_data( Archive & ar, const b2Body * t, const unsigned int file_version) { // save data required to construct instance b2World* WorldPtr= const_cast<b2Body*>(t)->GetWorld(); ar & WorldPtr; Save(ar, const_cast<b2Body*>(t), file_version); } template<class Archive> inline void save_construct_data( Archive & ar, const b2Fixture * t, const unsigned int file_version) { // save data required to construct instance b2Body* BodyPtr= const_cast<b2Fixture*>(t)->GetBody(); ar & BodyPtr; Save(ar, const_cast<b2Fixture*>(t), file_version); } template<class Archive> void serialize(Archive & ar, b2Fixture& b2, const unsigned int version) { std::cout << "b2Fixture is not serializable, only b2Fixture pointers are" << std::endl;}; template<class Archive> void serialize(Archive & ar, b2Body& b2, const unsigned int version) { std::cout << "b2Fixture is not serializable, only b2Fixture pointers are" << std::endl;}; template<class Archive> void Save(Archive & ar, b2Body* b2, const unsigned int version) { b2World* World = b2->GetWorld(); ar & World; b2BodyDef InitialBodyDef; InitialBodyDef.inertiaScale= b2->GetInertia(); // QUESTION: Is there any way to get/set this from a body (not def) ar & InitialBodyDef; // QUESTION: wtf is inertiaScale? any relation to MassData? b2BodyDef BodyDef; BodyDef.angle= b2->GetAngle(); BodyDef.position= b2->GetPosition(); BodyDef.active= b2->IsActive(); BodyDef.angularDamping= b2->GetAngularDamping(); BodyDef.angularVelocity= b2->GetAngularVelocity(); BodyDef.awake= b2->IsAwake(); BodyDef.bullet= b2->IsBullet(); BodyDef.fixedRotation= b2->IsFixedRotation(); BodyDef.linearDamping= b2->GetLinearDamping(); BodyDef.linearVelocity= b2->GetLinearVelocity(); BodyDef.type= b2->GetType(); BodyDef.userData= b2->GetUserData(); ar & BodyDef; // number of fixtures saved first so when loaded we know // how many fixturedefs to extract unsigned int numbFixtures=0; for (b2Fixture* fixture = b2->GetFixtureList(); fixture; fixture = fixture->GetNext()) numbFixtures++; ar & numbFixtures; //TODO: find out if boost will detect this as a list for (b2Fixture* fixture = b2->GetFixtureList(); fixture; fixture = fixture->GetNext()) ar & fixture; } template<class Archive> void Save(Archive & ar, b2Fixture* b2, const unsigned int version) { b2Body* Body = b2->GetBody(); ar & Body; //Registered so boost can differentiate types of "shapes" ar.register_type(static_cast<b2CircleShape *>(NULL)); ar.register_type(static_cast<b2PolygonShape *>(NULL)); b2Shape* Shape= b2->GetShape(); ar & Shape; b2FixtureDef FixtureDef; FixtureDef.density= b2->GetDensity(); FixtureDef.filter= b2->GetFilterData(); FixtureDef.friction= b2->GetFriction(); FixtureDef.isSensor= b2->IsSensor(); FixtureDef.restitution= b2->GetRestitution(); FixtureDef.userData= b2->GetUserData(); ar & FixtureDef; }

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Boost system library error
by Abbas Banaiyan 10 Aug '11

10 Aug '11

Hi, I installed Boost 1.4.47 on a Linux x86_64 server with gcc 4.4.4. When I try to make a simulator which uses Boost libraries I get the following error message: /home/abanaiya/local//include/boost/system/error_code.hpp:316: note: candidates are: boost::system::error_code::error_code(int&, const boost::system::error_category&) /home/abanaiya/local//include/boost/system/error_code.hpp:315: note: boost::system::error_code::error_code() /home/abanaiya/local//include/boost/system/error_code.hpp:311: note: boost::system::error_code::error_code(const boost::system::error_code&) ../../src/boost.task-0.4.2/boost/task/detail/bind_processor_linux.hpp: In function âvoid boost::this_thread::bind_to_processor(unsigned int)â: ../../src/boost.task-0.4.2/boost/task/detail/bind_processor_linux.hpp:41: error: no matching function for call to âboost::system::error_code::error_code(int&, const boost::system::error_category& (&)())â /home/abanaiya/local//include/boost/system/error_code.hpp:316: note: candidates are: boost::system::error_code::error_code(int&, const boost::system::error_category&) /home/abanaiya/local//include/boost/system/error_code.hpp:315: note: boost::system::error_code::error_code() /home/abanaiya/local//include/boost/system/error_code.hpp:311: note: boost::system::error_code::error_code(const boost::system::error_code&) ../../src/boost.task-0.4.2/boost/task/detail/bind_processor_linux.hpp: In function âvoid boost::this_thread::bind_to_any_processor()â: ../../src/boost.task-0.4.2/boost/task/detail/bind_processor_linux.hpp:59: error: no matching function for call to âboost::system::error_code::error_code(int&, const boost::system::error_category& (&)())â /home/abanaiya/local//include/boost/system/error_code.hpp:316: note: candidates are: boost::system::error_code::error_code(int&, const boost::system::error_category&) /home/abanaiya/local//include/boost/system/error_code.hpp:315: note: boost::system::error_code::error_code() /home/abanaiya/local//include/boost/system/error_code.hpp:311: note: boost::system::error_code::error_code(const boost::system::error_code&) /home/abanaiya/local//include/boost/system/error_code.hpp: At global scope: /home/abanaiya/local//include/boost/system/error_code.hpp:214: warning: âboost::system::posix_categoryâ defined but not used /home/abanaiya/local//include/boost/system/error_code.hpp:215: warning: âboost::system::errno_ecatâ defined but not used /home/abanaiya/local//include/boost/system/error_code.hpp:216: warning: âboost::system::native_ecatâ defined but not used make[2]: *** [sim.o] Error 1 make[1]: *** [all-recursive] Error 1 make: *** [all-recursive] Error 1 I also received the following error that I removed it by disabling the corresponded line at api_config.hpp file. /home/abanaiya/local//include/boost/system/api_config.hpp:28:5: error: #error user defined BOOST_POSIX_API or BOOST_WINDOWS_API not supported I also tried version 1.4.42 and got the same error. Would you please let me know hot to resolve it. I run the following command to install the Boost: ./bjam --prefix=$HOME/local install Thanks, Abbas

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Public Encryption with ASIO SSL
by David McCallum 09 Aug '11

09 Aug '11

I'm trying to create a system where clients can encrypt messages, but only the server can decrypt them. I'm configuring the context on the server-side like so: context_.set_options(boost::asio::ssl::context::default_workarounds | boost::asio::ssl::context::no_sslv2); context_.set_password_callback(boost::bind(&server::get_password, this)); context_.use_private_key_file("server.pem", boost::asio::ssl::context::pem); However, I can't find any way to load the public key on the clients. Can I create a connection that relies on public-key encryption? Or do the SSL classes expect me to use public-key encryption only to generate symmetrical keys, ie with Diffie-Hellman? -David

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Boost::Test Samples?
by Jeffrey Walton 09 Aug '11

09 Aug '11

Hi All, I'm not sure I have chosen the right testing architecture (external runner for a DSO), and I am having problems getting Boost::Test to run properly. I have print statements which are not printing in functions registered with BOOST_TEST_SUITE. And I have spiked a test would should print an error message. I thought it would be a good idea to look at [sample] projects that work rather than code snippets. Unfortunately, the link for "collection of examples" at [1] is broken. Does anyone know where to find Boost::Test samples? Thanks in advance, Jeff [1] http://www.boost.org/doc/libs/1_44_0/libs/test/doc/html/utf/intro.html

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[mpl] Safe to instantiate mpl classes for tag-dispatch-by-instance?
by Gabriel Redner 09 Aug '11

09 Aug '11

Hi all, Say I have a functor which accepts a tag instance: struct tagA {}; struct tagB {}; struct MyFunc { template <typename TTag> void operator()(TTag, int other_stuff) {...} }; In some cases I want to pass multiple tags at once. Is it safe to just instantiate mpl::pair, mpl::vector, etc. and use them for this purpose, since from a runtime perspective they're just empty classes? Or, is this a Bad Idea for some reason? Thanks, -Gabe

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Segmentation fault when using asio and poll_one
by Allan Nielsen 09 Aug '11

09 Aug '11

Hi I'm using Boost 1.46.1 asio for doing serial communication. About 1/1000 times when I run the poll_one I get this segmentation fault: Program received signal SIGSEGV, Segmentation fault. 0x0000000000434a7a in boost::asio::detail::reactor_op::perform (this=0x402010af1010004) at /usr/include/boost-1_46/boost/asio/detail/reactor_op.hpp:40 40 return perform_func_(this); (gdb) bt #0 0x0000000000434a7a in boost::asio::detail::reactor_op::perform (this=0x402010af1010004) at /usr/include/boost-1_46/boost/asio/detail/reactor_op.hpp:40 #1 0x0000000000435da6 in boost::asio::detail::epoll_reactor::run (this=0x6625c0, block=false, ops=...) at /usr/include/boost-1_46/boost/asio/detail/impl/epoll_reactor.ipp:286 #2 0x0000000000436a24 in boost::asio::detail::task_io_service::do_one (this=0x6624e0, lock=..., this_idle_thread=0x0) at /usr/include/boost-1_46/boost/asio/detail/impl/task_io_service.ipp:264 #3 0x0000000000436612 in boost::asio::detail::task_io_service::poll_one (this=0x6624e0, ec=...) at /usr/include/boost-1_46/boost/asio/detail/impl/task_io_service.ipp:188 #4 0x0000000000436e65 in boost::asio::io_service::poll_one (this=0x7fffffffe240, ec=...) at /usr/include/boost-1_46/boost/asio/impl/io_service.ipp:103 #5 0x000000000043b69b in CcTalkPort::receive (this=0x7fffffffe240) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:382 #6 0x000000000043b7dc in CcTalkPort::receive (this=0x7fffffffe240, size=5) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:396 #7 0x000000000043bcb5 in CcTalkPort::_ask (this=0x7fffffffe240, req=...) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:411 #8 0x000000000043ac6e in CcTalkPort::ask (this=0x7fffffffe240, req=...) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:317 #9 0x000000000043daef in CcTalkDevice::ask_hex (this=0x7fffffffe300, v=..., m=..., s=...) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:583 #10 0x000000000043ce69 in CcTalkDevice::request_software_revision (this=0x7fffffffe300) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:507 #11 0x000000000043c57f in CcTalkDevice::coreInfo (this=0x7fffffffe300) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:459 #12 0x00000000004325ff in main (argc=1, argv=0x7fffffffe528) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:820 Here is the snippet where I call it: while(1) { io_service.reset(); io_service.poll_one(ec); if ( read_result ) { timer.cancel(); return; } else if ( timer_result ) { throw CcTalkTimeOutException(); } } Any hints on how to debug this? -- Allan W. Nielsen

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Working around the restriction in enable_shared_from_this
by kelvSYC 09 Aug '11

09 Aug '11

Suppose I have a class called Group, extending boost::enable_shared_from_this<Group>. Now suppose I have something like this: class Foo { boost::shared_ptr<const Group> G; public: Foo(const Group& G_) : G(G_.shared_from_this()) {} }; This would totally barf if, among other things, G_ was allocated from the stack, say, since I don't have an owning shared_ptr instance. So, it would appear that, at the very least, if you were to allocate a Group on the stack, then you would need a shared_ptr with a null deleter to make use of Foo. This seems inconvenient to whoever may want to use Foo, so is there a way to change this so get around the shared_ptr instance restriction without changing Foo?

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path filesystem
by rudy 09 Aug '11

09 Aug '11

Hi, This is my first post, so please advise me if this is not the correct place to post my question. This is my question: I have the following directory pattern (Dir1 is the parent directory, and the rest are the child files/subdirectories): Dir1 file1 file2 .file3 subdir1 .subdir2 the following code will go through the Dir1, and it will fail in creating the "path" when it reaches ".file3" or ".subdir2" boost::filesystem:ath dir1_path(filepath.c_str()); How should I create a path to a directory that (for example) has the following path? /root/my_docs/pgg/.file1 filesystem::path works just fine if I had to deal with (/root/my_docs/pgg/file1) instead of (/root/my_docs/pgg/.file1) !!! apparently when the file/directory starts with '.', I cannot get filesystem::path to behave properly. please advise, thanks, Rudy

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Boost.Program_options: Parsing arguments like "+a" possible?
by boost_mailinglist＠gmx.de 09 Aug '11

09 Aug '11

Hello, is it possible to parse also arguments like "+a" with the library "Boost.Program_options"? The numbers of arguments are simple to much to use only the "-" or the "--" as a sign for arguments. If it possible, how have I to activate this function? Thank you. -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

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[asio] user defined composed operations and strands
by Tacheon 09 Aug '11

09 Aug '11

Hello, I am trying to implement some new composed operations (like boost::asio::async_read) with asio. However I am a bit concerned about thread-safety when the run-method of the used io_service object ist called from multiple threads and there are parallel read- and write operations on the same socket. The composed operations look like this: class io_port { public: //Ctors and so on... typedef boost::function<void (error_t const &)> completion_handler_t; void async_read_data ( raw_buffer_t & buffer , completion_handler_t const & handler) { //uses a composed operation itself... boost::asio::async_read ( socket , boost::asio::buffer(header) , boost::bind ( &io_port::handle_header_received , this , boost::ref(buffer) , handler , boost::asio::placeholders::error) ); } //first intermediate handler void handle_header_received ( raw_buffer_t & data , completion_handler_type const & handler , boost::system::error_code const & error { if(error) { handler(error_t(error)); } else { prepare_buffer(data, header.perparation_data()); //pseudo-code //uses a composed operation itself... boost::asio::async_read ( socket , boost::asio::buffer(data) , boost::bind ( &io_port::handle_data_received , this , boost::ref(buffer) , handler , boost::asio::placeholders::error) ); } } //second intermediate handler void handle_data_received ( raw_buffer_t & data , completion_handler_type const & handler , boost::system::error_code const & error ) { if(error) { handler(error_t(error)); } else { handler(error_t()); } } void async_write_data ( raw_buffer_t const & buffer , completion_handler_t const & handler) { ... } //quite similar to async_read_data }; usage may be either port.async_read ( buffer , handler ); or port.async_read ( buffer , strand.wrap(handler) ); //how to forward this to asio::async_read? If async_write_data is called and io_service::run is called from multiple threads, strands are should be necessary to avoid raced. The question is: How do I support handlers wrapped in a strand and how do I get this strand forwarded to async_read? As far as I understand this should be somehow possible by using asio_handler_invoke but the documentation is a bit too fuzzy on the topic for me to understand. -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de

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Re: [Boost-users] Enums to/from Strings
by Benjamin van den Hout 09 Aug '11

09 Aug '11

Hi John, > For the time being, I've made a function called to_string, which seems to be a common > choice. But what's the best way to make it automatically known to those other features? It's not the most pretty solution, but perhaps you could resort to the Boost Preprocessor library to generate both the enum and the 'toString' method for you. Some sample code can be found here on my blog: http://www.smork.info/blog/index.php?entry=entry110809-105615 Kind regards, Benjamin van den Hout

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Re: [Boost-users] [fusion] adapt std::tuple to be a fusion sequence?
by "Claas H. Köhler" 09 Aug '11

09 Aug '11

I was wondering about the status of the above topic: Does a boost implementation of an adaptor exist or is Sebastian's suggestion the best alternative currently available? His solution did not work out of the box for me, since g++-4.6 complained about an "incomplete type std::tuple_size<const std::tuple<..." However, when I replaced each occurence of std::tuple_size<X> by std::tuple_size< typename std::remove_cv<X>::type > everything seemed to work fine. Regards Claas > No docs. Also, this is just for the MSVC 10 (no-variadics) > >implementation. It was just something I hacked up quickly because I > >needed it for something internal. > > >Anyway, here it is. > > >Sebastian

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Boost::Test and streams
by Jeffrey Walton 09 Aug '11

09 Aug '11

Hi All, I'm working form http://www.boost.org/doc/libs/1_47_0/libs/test/doc/html/index.html. I can't seem to find Boost::Test's streams. The discussion of streams begins at [1]. [1] does list macros such as BOOST_TEST_DONT_PRINT_LOG_VALUE, but I'm interested in a C++-centric solution. For example: // test framework output stream using boost_test::tout; tout << loglevel::error << "My error message" << endl; tout << loglevel::warn << "My warning message" << endl; According to [2], I can set the log level from the environment and from the command line. But would like to set it dynamically. For example: tout << setlevel(warn); // warnings and above or tout.setlelvel(error); // errors and above In addition, I would like to be able to tie a file output to screen output, so I can watch the tests roll by and go to the log file for in depth reading. To be fair, redirection is covered at [3], but its not quite what we are looking for. For example: ofstream logfile(...); ... tout.attach(logfile); or tout.tie(logfile); Though the authors did a great job on the documentation, these topics do not appear to be included. Any ideas how one might go about these sorts of things? Thanks in advance, Jeffrey Walton [1] http://www.boost.org/doc/libs/1_47_0/libs/test/doc/html/utf/user-guide/test… [2] http://www.boost.org/doc/libs/1_47_0/libs/test/doc/html/utf/user-guide/runt… [3] http://www.boost.org/doc/libs/1_47_0/libs/test/doc/html/utf/user-guide/test…

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[boost.asio 1.47] : changing host time
by Mathieu Peyréga 08 Aug '11

08 Aug '11

Hello, I would like to know if there are any implications with the fact of having a call to settimeofday in order to change the system time while using boost asio (asynchronous timers). The point of calling settimeofday (software is running on a linux box with super user privileges) is to synchronize the system clock with a GPS receiver clock at some point while the io service is already running. Best regards, Mathieu Peyréga

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Re: [Boost-users] Asio problems with async_read
by Alex Perry 08 Aug '11

08 Aug '11

Allan Nielsen wrote on Mon, 8 Aug 2011 14:13:08 +0200 > Hi > > I have a funciton where we I am using boost::asio to read from the > serial port of my computer. > > I have started out with an implementation which uses read, and I am > now trying to convert it to async_read because I want a time out. > > When I am trying to use the async_read version, I get timeouts after I > have read one or two charterers, even though I know there are more > charterers to be read on the wire. > Not sure that this is much help since I've never really used boost.asio and reading further down the thread it may be a problem with how you are calling it. However having done a lot of serial comms in the past seeing a couple of characters only whilst more data is on the wire I'd guess that the timeout is as a result of the low level serial hardware interrupt. The UART is probably signalling that its internal FIFO buffer is full and you need to read this promptly - quite how that all pans out and what daemon / service has the responsibility of reading this these days I haven't got the faintest - I was writing TSR's when I knew the gory technical details of this so life was much simpler. I'm actually impressed that you've found a computer that still has a serial port on it! Most seem to have gone over to the ubiquitous USB these days - though that may be the easiest solution - use USB and a usb/serial converter which would avoid having to rediscover the lost art of programming UART latch timings etc and give you a decent amount of low level buffering so you could ignore low level stuff and just read the data. http://www.bb-europe.com/tech_articles/USB_converters.asp?gclid=CPvOgur5v6o… or some such. HTH Alex

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Asio problems with async_read
by Allan Nielsen 08 Aug '11

08 Aug '11

Hi I have a funciton where we I am using boost::asio to read from the serial port of my computer. I have started out with an implementation which uses read, and I am now trying to convert it to async_read because I want a time out. When I am trying to use the async_read version, I get timeouts after I have read one or two charterers, even though I know there are more charterers to be read on the wire. Here is the code: void set_result( boost::optional<boost::system::error_code> * a, boost::system::error_code b ) { a->reset( b ); } std::vector<uint8_t> receive(boost::asio::io_service & io, boost::asio::serial_port & cctalk_port){ #if 0 boost::optional<boost::system::error_code> timer_result; boost::optional<boost::system::error_code> read_result; boost::asio::deadline_timer timer( io ); timer.expires_from_now( boost::posix_time::milliseconds(5000) ); timer.async_wait( boost::bind(&set_result, &timer_result, _1) ); boost::asio::streambuf result; boost::asio::async_read( cctalk_port, result, boost::asio::transfer_at_least(1), boost::bind( &set_result, &read_result, _1 )); while(1) { io.poll_one(); if ( read_result ) { timer.cancel(); std::vector<uint8_t> res(boost::asio::buffer_cast<const uint8_t * >(result.data()), boost::asio::buffer_cast<const uint8_t * >(result.data()) + result.size() ); return res; } else if ( timer_result ) { throw runtime_error("timeout"); } } throw runtime_error("Should not happend"); #else uint8_t c; boost::asio::read(cctalk_port, boost::asio::buffer(&c, 1)); std::vector<uint8_t> res; res.push_back(c); return res; #endif }

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need help on compile error about gregorian and regex
by Eric Lin 08 Aug '11

08 Aug '11

Dear Boost experts: when I compile a program(some example code from c++ book) it contain #include <boost/date_time/gregorian/gregorian.hpp> #include <boost/regex.hpp> and I got a lot compile error related about it on my g++ with boost 1.46.1 installed ------- ------- ----------------------------------------------------------------------------------------------------- eric@eric-laptop:~/cppcookbook/download/TESTDIR$ g++ -ltinyxml 14-3.cpp /tmp/cct65iz6.o: In function `unsigned short boost::date_time::month_str_to_ushort<boost::gregorian::greg_month>(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': 14-3.cpp:(.text._ZN5boost9date_time19month_str_to_ushortINS_9gregorian10greg_monthEEEtRKSs[unsigned short boost::date_time::month_str_to_ushort<boost::gregorian::greg_month>(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)]+0x97): undefined reference to `boost::gregorian::greg_month::get_month_map_ptr()' /tmp/cct65iz6.o: In function `bool boost::regex_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)': 14-3.cpp:(.text._ZN5boost11regex_matchIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS5_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SD_RNS_13match_resultsISD_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsE[bool boost::regex_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)]+0x4c): undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()' /tmp/cct65iz6.o: In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)': ------------------------------------------------------------------------------------------This is only front part of the whole errors------------------- these code is claimed worked on msvc++7.1 on window xp and you can download it from http://examples.oreilly.com/9780596007614/ 14-1.xml 14-2.h 14-3.cpp to test by yourself plz help and thanks a lot in advance, Eric(on g++ 4.5.2, linuxkernel 2.6.38-10)

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boost.preprocessor BOOST_PP_SEQ_FOR_EACH shows strange error messages
by aliko 07 Aug '11

07 Aug '11

Hi! I'm trying to utilize preprocessor library for the first time and my questions probably are too stupid for this list but I have not found another place to ask.:) In series of projects I have a repetitive task with defining many variables and structures based on configuration of embedded platform. First I've tried to generate array of numbers from ADC, the main definition from which all the variables and structures should be created. But I've got a strange error messages which I can't interpret right way. My code is: ********************************************************************** #include <boost/preprocessor/seq.hpp> #include <boost/preprocessor/tuple.hpp> #define POS_NAME 0 #define POS_PIN 1 #define POS_SKIP 2 #define POS_K 3 #define POS_TYPES 4 #define POS_SCALES 5 #define NFIELDS 6 #define NSIGS 5 enum {DISCRETE, ANALOG, CONTROL, MEASURE, END_TYPES}; //NAME, PIN, SKIP, FILTERK, DATATYPES, SCALES #define ADC ( \ (POSITION, 0, 0, 100, (ANALOG, CONTROL, MEASURE), \ (((DISCRETE, ANALOG) (1000, 4000) (0, 20000)) \ ((ANALOG, CONTROL) (4000, 20000) (0, 10000)) \ ((ANALOG, MEASURE) (4000, 20000) (0, 3000)))), \ (CURRENT, 1, 0, 100, (ANALOG, CONTROL), \ (((DISCRETE, ANALOG) (1000, 4000) (0, 20000)) \ ((ANALOG, CONTROL) (4000, 20000) (0, 10000)))), \ (HALL, 2, 0, 100, (ANALOG, CONTROL), \ (((DISCRETE, ANALOG) (1000, 4000) (0, 20000)) \ ((ANALOG, CONTROL) (4000, 20000) (0, 10000)))), \ (PRESSURE, 4, 0, 100, (ANALOG, CONTROL, MEASURE), \ (((DISCRETE, ANALOG), (1000, 4000) (0, 20000)) \ ((ANALOG, CONTROL) (4000, 20000) (0, 10000)) \ ((ANALOG, MEASURE) (4000, 20000) (0, 3000)))), \ (TEMPERATURE, 10, 0, 100, (CONTROL, MEASURE), \ (((DISCRETE, CONTROL) (1000, 4000) (0, 20000)) \ ((CONTROL, MEASURE) (4000, 20000) (0, 3000)))) \ ) #define WITH_NUMBERS(Z0, Z1, SEQ) BOOST_PP_SEQ_ELEM(1, SEQ), BOOST_PP_SEQ_ELEM(2, SEQ), #define TO_NUMBERS(Z0, Z1, SEQ) BOOST_PP_SEQ_FOR_EACH(WITH_NUMBERS, _, SEQ) #define TO_SCALES(Z0, Z1, TUPLE) BOOST_PP_SEQ_FOR_EACH(TO_NUMBERS, _, BOOST_PP_TUPLE_ELEM(NFIELDS, POS_SCALES, TUPLE)) unsigned int bounds[] = {BOOST_PP_SEQ_FOR_EACH(TO_SCALES, _, BOOST_PP_TUPLE_TO_SEQ(NSIGS, ADC))}; ********************************************************************** The errors are: ./test_preprocess.cpp:56:1: error: ‘TO_NUMBERS’ was not declared in this scope ./test_preprocess.cpp:56:1: error: ‘_’ was not declared in this scope ./test_preprocess.cpp:56:1: error: ‘(0, (._74)1u)’ cannot be used as a function ./test_preprocess.cpp:56:1: error: ‘(0, (._74)2u)’ cannot be used as a function ./test_preprocess.cpp:56:1: error: ‘(0, (._74)3u)’ cannot be used as a function ./test_preprocess.cpp:56:1: error: ‘BOOST_PP_SEQ_FOR_EACH’ was not declared in this scope ... end so on Why it's not sees TO_NUMBERS definition?

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99 Bottles of Beer using Boost MPL, feedback invited
by Alastair Rankine 07 Aug '11

07 Aug '11

So inspired by http://programmingpraxis.com/2011/08/05/ninety-nine-bottles-of-beer/ , I decided to attempt to generate the lyrics to the 99 bottles of beer song. To make it interesting I decided to use Boost MPL to generate the lyrics using template metaprogramming. Here is my attempt. https://gist.github.com/1130306 It compiles with gcc 4.2 against boost 1.47. Given that I am pretty inexperienced with MPL I would very much appreciate some constructive criticism. I'd specifically like to know if the code can be cleaned up to be simpler or to perform better. Also I'm not entirely happy with the duplication in the PrintX functors, would definitely like to get a better approach here. Thanks,

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[Fusion] Is there an assignment function for any two conformant sequences?
by someguy 07 Aug '11

07 Aug '11

Is there a function like "assign(dest_fusion_seq,src_fusion_seq)" which does recursive element-wise assignment between any two conformant fusion sequences(including adapted ones)? I didn't find one but I think there should be such functionality. -- View this message in context: http://boost.2283326.n4.nabble.com/Fusion-Is-there-an-assignment-function-f… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Boost.Serialization] Serializing "abstract" classes
by Júlio Hoffimann 06 Aug '11

06 Aug '11

Dear all, I'm using Boost 1.45... I've read Boost.Serialization docs so many times and can't understand why my testcase is not working as expected. According to the following three links, we need to address serialization of derived classes with "abstract" base class by using boost macros: http://www.boost.org/doc/libs/1_47_0/libs/serialization/doc/traits.html#exp… http://www.boost.org/doc/libs/1_47_0/libs/serialization/doc/special.html#ex… http://www.boost.org/doc/libs/1_47_0/libs/serialization/doc/traits.html#abs… I did my testcase ( http://codepad.org/6ETp1Ac0 ) completely based on the demo: http://www.boost.org/doc/libs/1_47_0/libs/serialization/example/demo.cpp Compiling and running shows that the derived class archive contains just the base class data members. What is happening? How can i solve this problem? I really appreciate any help, Júlio.

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Another baffling error message
by Eric Fowler 06 Aug '11

06 Aug '11

Sorry to have to ask the list for help, but I am once again stumped. Perhaps you will find this easy. I have some classes defined: using namespace std; using namespace boost; class POS{..stuff..} class LEN{...stuff...} typedef adjacency_list<vecS, vecS, undirectedS, POS, LEN> DG; typedef graph_traits<DG>::vertex_descriptor Vertex; typedef graph_traits<DG>::edge_descriptor Edge; class DelaunayGraph: public DG { public: void foo() { Edge e = whatever(); remove_edge(e, *this); // <<<<----THIS BLOWS UP ..stuff... } The error I am getting is: c:\documents and settings\eric\my documents\visual studio 2008\projects\shuttle\delaunay\trunk\delaunaygraph.h(371) : error C2661: 'boost::undirected_graph_helper<Config>::remove_edge' : no overloaded function takes 2 arguments with [ Config=boost::detail::adj_list_gen<boost::adjacency_list<boost::vecS,boost::vecS,boost::undirectedS,POS,LEN>,boost::vecS,boost::vecS,boost::undirectedS,boost::property<boost::vertex_bundle_t,POS>,boost::property<boost::edge_bundle_t,LEN>,boost::no_property,boost::listS>::config ] What am I doing wrong in this instance, and what design principle am I violating? Eric

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datetime will not be parsed
by Kraus Philipp 06 Aug '11

06 Aug '11

Hello, I use this code for parsing a string into a datetime: boost::local_time::local_date_time l_datetime(boost::date_time::not_a_date_time); std::istringstream l_datestream("Sat Aug 06 10:52:26 +0000 2011"); l_datestream.imbue( std::locale( std::locale::classic(), new boost::local_time::local_time_input_facet("%a %b %d %H:%M:%S %q %Y")) ); l_datestream >> l_datetime; But the l_datetime is always set to "not a date time". I think the parameter within the input facet are correct, so I don't understand why the string is not be parsed. Can anyone help me please to create a working solution? Thanks Phil

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question about boost::intrusive_ptr
by Mahmood Naderan 06 Aug '11

06 Aug '11

Hi I used boost::intrusive_ptr in a function, say foo(), like this: boost::intrusive_ptr<BranchFeedback> theFeedback ( new BranchFeedback() ); std::vector< std::vector< BPredState > > theFetchState; .... theFeedback->theBPState = &theFetchState[anIndex][!anOne]; The difinition of BranchFeedback and BPredState are: struct BranchFeedback : boost::counted_base { ... boost::intrusive_ptr<BPredState> theBPState; }; struct BPredState : boost::counted_base { ... uint32_t theGShare; uint32_t theSerial; }; The problem is when foo() reaches the end (I mean '}'), I get segmentation fault which points to ~intrusive_ptr() { if(p_ != 0) intrusive_ptr_release(p_); } I thought I used the intrusive_ptr in a correct way. Is there any consideration that I missed? Thanks, // Naderan *Mahmood;

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is boost 1.46.1 contain thread/read_write_mutex.hpp
by Eric Lin 05 Aug '11

05 Aug '11

dear boost progamers: when I tried to compile from my g++4.5.2 a simple file which include #include <boost/thread/read_write_mutex.hpp> ------- root@eric-laptop:/home/eric/cppcookbook/ch12# g++ -lboost_thread Example12-3.cpp Example12-3.cpp:3:45: fatal error: boost/thread/read_write_mutex.hpp: No such file or directory compilation terminated. --------- and I check from / of my ubuntuLinux with boost 1.46.1 I can not find any file name as read_wirte_mutex.hpp --------- root@eric-laptop:/# find . | grep read_write_mutex.hpp root@eric-laptop:/# --- and I can not digout from web how to make it compile under gcc/g++ plz help, Eric

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