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Stacktrace library starts review today 14th Dec
by Niall Douglas 15 Dec '16

15 Dec '16

The formal review of the Stacktrace library by Antony Polukhin starts today 14th Dec and will conclude before Christmas. I appreciate we are likely a bit tired out from the many library reviews recently and of course it's Christmas, but given the lack of a portable way to work with stack backtraces, which you inevitably need to do eventually in any non-toy production application, Stacktrace needs your review! Stacktrace is an optionally header-only library providing four implementation backends, libunwind (POSIX only), windbg (Windows only), backtrace (from the C library on most POSIX implementations) and a null backend. At its very simplest it lets you capture the stack backtrace for the calling thread and to print it to a std::ostream& of your choice. The basic_stacktrace<> class quacks like a STL container of frame object instances. The rest of the API pretty much follows STL design principles for the most part. Use is therefore unsurprising. You can find the documentation at http://apolukhin.github.io/stacktrace/index.html and the github repo at https://github.com/apolukhin/stacktrace. Review guidelines ================= Reviews should be submitted to the developer list (boost(a)lists.boost.org) preferably with '[stacktrace]' in the subject. Or if you don't wish to for some reason or are not subscribed to the developer list you can send them privately to me at 's_sourceforge at nedprod dot com'. If so, please let me know whether or not you'd like your review to be forwarded to the list. For your review you may wish to consider the following questions: - What is your evaluation of the design? - What is your evaluation of the implementation? Most of my personal concerns with this library are with the implementation and I would hugely appreciate feedback from others with substantial experience of using stacktracing "in anger" in non-trivial use case scenarios. - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? And finally, every review should attempt to answer this question: - Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Even if you do not wish to give a full review any technical comment regarding the library is welcome as part of the review period and will help me as the review manager decide whether the library should be accepted as a Boost library. Any questions about the use of the library are also welcome. Finally, thanks to Edward whose announcement of the Synapse library review I borrowed heavily from as I thought it very well structured. Hopefully the above is just as clear. Niall -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/

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SSDLC Compliance - Boost C++ Libraries
by GAN Kok Leong, Adrian 14 Dec '16

14 Dec '16

Hi, We have a cybersecurity requirement for all software. We would like to know whether Boost C++ Libraries is developed and comply with Secure Software Development Life Cycle (SSDLC)? Regards Adrian Gan [This e-mail is confidential and may be privileged. If you are not the intended recipient, please kindly notify us immediately and delete the message from your system; please do not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] ---ST Electronics Group---

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question
by David Bergman 13 Dec '16

13 Dec '16

Is boost capable of parallel processing. That is do wrappers or interfaces exist to call existing parallel versions of functions to help the user/programmer?Thank you, David

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question
by David Bergman 13 Dec '16

13 Dec '16

Does boost handle Bessel functions with imaginary or complex index?Thank you, David

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[C++ Libraries] Is it develop according to SSDLC?
by GAN Kok Leong, Adrian 13 Dec '16

13 Dec '16

Hi, I would like to know whether Boost C++ Libraries version 1.36.0-11.17 is developed and comply with Secure Software Development Life Cycle (SSDLC)? Regards Adrian Gan [This e-mail is confidential and may be privileged. If you are not the intended recipient, please kindly notify us immediately and delete the message from your system; please do not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] ---ST Electronics Group---

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Unexpected static libraries in Windows build
by Christian Ullrich 06 Dec '16

06 Dec '16

Hello, I have a question about compiling Boost (1.62.0) itself on Windows, with Visual Studio 2015. I want to build DLLs only, but after I run .\b2 link=shared runtime-link=shared [...] install , I have a number of static libraries (libboost_...-mt-1_62.lib) in the lib directory. Specifically: - system - chrono - timer - unit_test_framework - test_exec_monitor - exception The first four also exist as the DLLs I expected to get. From testing some previous Boost releases, it seems that the number of unexpected static libraries increases over time (1.58 only produces two, and more appear with the versions in between that and 1.62). Why are these static libraries built in a shared/shared configuration? Do I need to keep them, or are they some kind of temporary build artifact (used to build others, perhaps)? I have looked through the documentation, mailing list archive, bug tracker, etc., but could not find anything on the subject. If I have not looked hard enough, any pointers will be welcome. I even looked at b2's dependency graph (-d +12), and from that, it appears they are top-level dependencies, but I cannot figure out where _any_ top-level dependencies are defined, let alone these. Thanks for any hints, -- Christian

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[boost.build] how to install boost for arduino ide
by uğur aykar 06 Dec '16

06 Dec '16

>Hello everyone; >I am trying to figure out how to use boost libraries for arduino (avr-gcc). I am so >new to the boost. >I especially want to use lorenz example and compile it with arduino ide. >it requires the odeint library inside the "Boost/numeric/odeint. " which i >downloaded from https://www.codeproject.com/articles/268589/odeint-v-solving-ordinary-diffe… >and dowloaded the whole boost library version boost_1_62_0. >but i couldn't understand how to install for arduino ide. >where should i start? I feel so lost here. Thank you all Ugur Aykar uguraykar(a)hotmail.com

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boost_regex compiler error
by Chris Padwick 06 Dec '16

06 Dec '16

Hi - I am stuck on a linker error with the boost_regex library. My platform is ubuntu 16.04 LTS, arm64, NVIDIA TX1. I downloaded and built boost 1.62.0 with the following parameters: ./bootstrap.sh --prefix=/usr/local sudo ./b2 -d2 architecture=arm address-model=64 install I compiled a simple program using this command line: g++ main.cpp -I/usr/local/include -L/usr/local/lib -lboost_regex Here is the program: #include <boost/regex.hpp> #include <iostream> using namespace std; int main(int argc, char *argv[]) { static const boost::regex rxInt("[0-9]+"); string word = "foobar"; if(boost::regex_match(word, rxInt)) { cout << "Integer" << endl; } else { cout << "Not integer" << endl; } return 0; } Here are the linker errors: /tmp/ccuOD7Zj.o: In function `bool boost::regex_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::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::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::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)': main.cpp:(.text._ZN5boost11regex_matchIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISB_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SJ_RNS_13match_resultsISJ_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsE[_ZN5boost11regex_matchIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISB_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SJ_RNS_13match_resultsISJ_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsE]+0x58): undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()' /tmp/ccuOD7Zj.o: In function `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::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, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >)': main.cpp:(.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISC_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC2ESC_SC_RNS_13match_resultsISC_SF_EERKNS_11basic_regexIcSJ_EENS_15regex_constants12_match_flagsESC_[_ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISC_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC5ESC_SC_RNS_13match_resultsISC_SF_EERKNS_11basic_regexIcSJ_EENS_15regex_constants12_match_flagsESC_]+0xf8): undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)' collect2: error: ld returned 1 exit status Any hints would be appreciated. Should I try to use an earlier version of boost? thank you!

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[test] Really deactivate test
by Florian Lindner 05 Dec '16

05 Dec '16

Hello, I need to conditionally decativate tests and use a custom decorator for that, like that: virtual void apply(bt::test_unit& tu) { [...] if (std::find(_ranks.begin(), _ranks.end(), rank) == _ranks.end()) { std::cout << rank << " Disable, because of rank, test: " << tu.full_name() << std::endl; tu.p_default_status.value = bt::test_unit::RS_DISABLED; return; } } (i'm happy to provide full source code, if anyone is interested) As you can see it's deativated on some MPI ranks only. However, if a user uses -t "testname" it is activated again. Is there a way to really deactivate the test? Or delete it from the test tree? Thanks, Florian

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VS 2017 RC + boost.context
by Michael Steinberg 05 Dec '16

05 Dec '16

Hi there, I'm trying to build boost with VS 2017 RC but run into problems building boost.context. The project jam file somehow triggers to build the "unsupported.cpp", but I'm not proficient enough with the build system to find out how I can circumvent that. I would be very grateful if somebody could help me out with this. Cheers! Michael

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[Boost.Container] Performance of static_vector with default_init_t
by dariomt＠gmail.com 04 Dec '16

04 Dec '16

Hi, I'm constructing a static_vector<double,N>(n, default_init). I was expecting the constructor call to vanish into just setting the start pointer and the size & capacity members (and verifying n<=N). However, the profiler is showing some time spent in the loop inside uninitialized_default_init_alloc_n (boost/container/detail/utilities.hpp:678) For a builtin type and default_init_t, why do we even need to invoke the allocator? Can't we just leave the memory uninitialized? This is with Boost 1.55 and VS2008 Thanks in advance

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[Boost.Signals2] Problem with cleanup when disconnecting from slot.
by Paul Blampspied 03 Dec '16

03 Dec '16

Am I right in thinking that when a signal is connected to a closure created by boost::bind, then the closure should be destructed when the connection is closed ? I am having trouble because I pass a boost::shared_ptr in the closure. The use count does not drop when the signal connection is closed (the signal is connected to a one-shot slot which closes the connection). As a result the shared_ptr never deletes its data causing a memory leak. I have seen a few mentions of bugs in signals2 with respect to object destruction on connection termination. Perhaps I have fallen foul of that. It seems quite a serious bug though considering the general standard of boost. Given that the one-shot slot receives the shared_ptr I am considering a hack to fix the problem - explicitly break into the shared_ptr and decrement the reference count that I believe should be decremented by conn.disconnect(). Is there a better way ?

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Closure not destructed properly when signals2 connection is closed.
by Paul Blampspied 03 Dec '16

03 Dec '16

Am I right in thinking that when a signal is connected to a closure created by boost::bind, then the closure should be destructed when the connection is closed ? I am having trouble because I pass a boost::shared_ptr in the closure. The use count does not drop when the signal connection is closed (the signal is connected to a one-shot slot which closes the connection). As a result the shared_ptr never deletes its data causing a memory leak. I have seen a few mentions of bugs in signals2 with respect to object destruction on connection termination. Perhaps I have fallen foul of that. It seems quite a serious bug though considering the general standard of boost. Given that the one-shot slot receives the shared_ptr I am considering a hack to fix the problem - explicitly break into the shared_ptr and decrement the reference count that I believe should be decremented by conn.disconnect(). Is there a better way ?

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[Log] Random "double free or corruption" in dtor of attribute_value_set
by robin.lorke＠jenoptik.com 01 Dec '16

01 Dec '16

Hi Gentlemen, I have an application that is using Boost.Log. The application is long-term running (days, weeks, maybe months). Currently I am experiencing random crashes in my application that seem related to Boost.Log. I dont't say that is is a bug in Boost.Log, but probably I am doing something wrong. I am using version 1.55.0 but I also tried upgrading to version 1.61.0 but it is still happening there. I am currently able to reproduce the crash by forcing logs at a pace of 3 records per second. Then it takes up to 3 days for the crash to happen. The application is multi-threaded and therefore several threads may be logging at the same time. For that reason I chose "severity_logger_mt". It seems related to the destruction of objects of type attribute_value_set. This is a gdb stacktrace of the crash (gcc O0 build): (gdb) bt #0 0xb6bdbed8 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:66 #1 0xb6bdf960 in __GI_abort () at abort.c:90 #2 0xb6c139fc in __libc_message (do_abort=2, fmt=0xb6cc8c44 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:200 #3 0xb6c1e17c in malloc_printerr (action=3, str=0xb6cc8d80 "double free or corruption (!prev)", ptr=<optimized out>) at malloc.c:4949 #4 0xb6b3fcb8 in boost::log::v2_mt_posix::attribute_value_set::~attribute_value_set() () from /usr/lib/libboost_log.so.1.55.0 #5 0xb6b42688 in boost::log::v2_mt_posix::record_view::public_data::destroy (boost::log::v2_mt_posix::record_view::public_data const*) () from /usr/lib/libboost_log.so.1.55.0 #6 0xb6b44c7c in boost::log::v2_mt_posix::core::push_record_move (boost::log::v2_mt_posix::record&) () from /usr/lib/libboost_log.so.1.55.0 #7 0xb6e66814 in Logger::addLog(Logger::LEVEL, char const*, char const*, int) () from /usr/lib/libtslog.so.1 #8 0x0005ba50 in addLogRusp (iMessageId=2, sMessage=<optimized out>, sProcess=0x8dee8 "Application", eLevel=Logger::LEVEL_INFO) at ../src/RLS-V/Platform/System.inl.h:303 #9 RLS::Application::fnThreadRuspOut (thread=...) at ../src/RLS-V/Application.cpp:1447 #10 0xb6e7aa4c in Thread::startFunction(void*) () from /usr/lib/libtscommon.so.1 #11 0xb6edae38 in start_thread (arg=0xb3eff460) at pthread_create.c:313 #12 0xb6c7c318 in ?? () from /lib/libc.so.6 Backtrace stopped: previous frame inner to this frame (corrupt stack?) This is the global logger initialization (using some custom attributes): BOOST_LOG_GLOBAL_LOGGER_INIT(appLogger, boost::log::sources::severity_logger_mt< robot::log::Severity >) { core::get()->add_global_attribute("TimeStamp", attributes::local_clock()); core::get()->add_global_attribute("ProcessID", AttrProcessId()); core::get()->add_global_attribute("LineCounter", attributes::counter< unsigned int >()); core::get()->add_global_attribute("Process", attributes::current_process_name()); core::get()->add_global_attribute("Scopes", attributes::named_scope ()); core::get()->add_global_attribute("LineID", attributes::counter< unsigned int >(1)); core::get()->add_global_attribute("SimpleTimeStamp", AttrSimpleTime ()); Logger::init(); sources::severity_logger_mt< Severity > lg; return lg; } These are are my macros for logging: //these are needed to convert a macro into a string #define STRINGIFY(x) #x #define TOSTRING(x) STRINGIFY(x) /* NOTE: * __FUNCTION__ is not a macro. It's a char pointer. So we use an empty std::string as basis to concatenate the char* to it */ #define R_LOG_ID(x,y) BOOST_LOG_SEV (robot::log::appLogger::get(), y) << boost::log::add_value("LogID", x) << boost::log::add_value("FLF", ROBOT_FLF) #define R_LOG(x) R_LOG_ID(0, x) #define ROBOT_FLF std::string() + TOSTRING(__FILE__) + ":" + TOSTRING (__LINE__) + " (" + __FUNCTION__ + ")" While "R_LOG_ID" is the only one that is used currently. There are currently three sinks active: syslog, console and a custom sink sending log records via an IPC mechanism (http://www.cs.cmu.edu/~./IPC/) I am currently testing if it will still happen if I deactivate one or more of those sinks. I imagine it will be hard to tell the exact problem from the information above but maybe you guys could point me in the right direction where to dig deeper. I will happily provide any missing information and/or code snippets that could help. Possibly there are well-known common mistakes that can lead to that memory corruption in attribute_value_set? Maybe something like lazy evaluation of log expressions or multi-threading issues? Many thanks in advance for any help! Robin Lorke

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std::future::wait_for() not working in Boost UDP socket async receive operation
by jc.francois＠gmail.com 30 Nov '16

30 Nov '16

The good people over at stackoverflow were not able to help me with this issue that I expected to be trivial. I am writing a UDP server app with Boost that should listen on a socket for 5 seconds and if no datagram has been received within these 5 seconds, move on to do other things. After some research I decided to try the solution based on std::future. The problem is that the call to wait_for() always times out as if no data was received. But if I set a breakpoint on the line that executes after the timeout and that I inspect variables I see that the buffer contains the received datagram and the remote_endpoint object contains the address of the client. In other words the socket receive works as expected but the std::future::wait_for() does not react. why? Here is my test server code: { try { boost::asio::io_service io_service; boost::asio::io_service::work work(io_service); std::thread thread([&io_service]() { io_service.run(); }); udp::socket socket(io_service, udp::endpoint(udp::v4(), 10000)); char recv_buf[8]; for (;;) { ZeroMemory(recv_buf, 8); udp::endpoint remote_endpoint; std::future<std::size_t> recv_length; recv_length = socket.async_receive_from( boost::asio::buffer(recv_buf), remote_endpoint, 0, boost::asio::use_future); if (recv_length.wait_for( std::chrono::seconds(5)) == std::future_status::timeout) { printf("time out. Nothing received.\n"); } else { printf("received something: %s\n", recv_buf); } } io_service.stop(); thread.join(); } catch (std::exception& e) { printf("Error: %s\n", e.what()); } return 0; }

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Question on data structure usage
by Ram 29 Nov '16

29 Nov '16

Hi, I have a map as follows, boost::unordered_map<string, string> sample_map; I would like to look up the keys using wildcards/regex from the user and get the values corresponding to it(get multiple matches). It looked like there is no straightforward way to do it. So, I was thinking as an when I populate the map, I create a seperate data structure to store the keys, so that I can get the values(list) that match my user inputted regex/wildcard search. The I use this list to get the values from the map. What data structure can I use for this purpose? Is my approach correct? Or can I do this directly using the map? Please help me solve this problem. Thanks, -R

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Re: [Boost-users] Do we have plan to support VS 2017?
by senthil vel 29 Nov '16

29 Nov '16

Hi All, I am using VS 2017 for my software development.The last official release of boost ( boost_1_62_0 ) supports VS 2015. When will we get VS 2017 supported boost library? Is there any workaround, till we get the support? Regards, Senthil

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[Boost.DateTime] How to bypass checks in boost::gregorian::date constructor
by dariomt＠gmail.com 28 Nov '16

28 Nov '16

>From the docs I see: "date(greg_year, greg_month, greg_day) Construct from parts of date. Throws bad_year, bad_day_of_month, or bad_day_month (derivatives of std::out_of_range) if the year, month or day are out of range." In my use case, I know for sure that the year, month and date are all in the valid range of values, so all the validity checks done by the library become redundant. Is it possible to somehow bypass those checks?

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Re: [Boost-users] Building Boost 1.62 With Visual Studio 2017 RC
by Trueman, Chris 24 Nov '16

24 Nov '16

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Building Boost 1.62 With Visual Studio 2017 RC
by Trueman, Chris 24 Nov '16

24 Nov '16

2 1

Assertion failure in r_c_shortest_paths.hpp
by Amit Prakash Ambasta 23 Nov '16

23 Nov '16

Hi, I have a sample r_c_shortest_paths use case demonstrated below. However on executing this code, assertion error occurs at /usr/include/boost/graph/r_c_shortest_paths.hpp:473: Assertion `p_cur_label->b_is_valid' failed. I've referred to the prior issue reported at https://svn.boost.org/trac/boost/ticket/11723 However, against his example specified, I can not reproduce the error.

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[release] Boost 1.63.0 Beta 1
by Marshall Clow 21 Nov '16

21 Nov '16

The first beta packages for 1.63.0 beta 1 are now available: <https://sourceforge.net/projects/boost/files/boost/1.63.0.beta.1/> The SHA256 checksums are as follows: 3dbc1bca10941710755c13a00b1ae56d2d37fe90bbadcf9746203194f9d33e3a boost_1_63_0.7z c8b986fd57e436fd88dbc70e51d3e21efa2be3bdf835fa499b2cf6c0a8cc2985 boost_1_63_0.tar.bz2 745d99e4be9c0f324ec7ba15b7d228fd780067f2e8aeae2f16660a4cf6e6a051 boost_1_63_0.tar.gz e66bd6e2f637148c314398b92bc1f3cbdc777ee282f9de7885697afad3d9c202 boost_1_63_0.zip As always, the release managers would appreciate it if you download the archive of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. Thanks! -- The release managers

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beginner boost::statechart questions
by Bedeho Mender 20 Nov '16

20 Nov '16

Hi, I have a few questions about the statechart library. 1) I would like to pass around a representation of the current configuration of a machine, to allow inspection of local variables and active states. The easiest approach would be to just pass around a copy of the machine, but this is not possible since the state_machine class is noncopyable. An alternative could have been to pass around a constant ref/ptr to the machine, but this is also not workable because the inspection will happen in another thread, and synchronisation is not feasible. Any suggestions? One alternative is to create a new snapshot representation, but it will be a headache to keep in synch with the primary machine. 2) A related question is whether there is a good way to start a machine in a given configuration? Using a sequence of events works in principle, but its a very impractical way to do so. For example if one wishes to restore a configuration from a prior session, then the client code has to log the full event history, and it may have a very hard time determining how many events need to be logged to reconstruct the given configuration. Logging and storing *all* events from the prior session will in many cases be wasteful, or even infeasible. 3) Suppose a machine makes a certain callback to client code in a set of different reactions. It would be nice if the client could inspect the currently active state, from which the given reaction is originating. However, my understanding is that the machine is unstable when processing a reaction, hence this is not possible. Is there a way around this? Best Bedeho Mender ᐧ

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[geometry] Cannot compile boost::geometry::intersection
by Stanley Friesen 17 Nov '16

17 Nov '16

I am using boost library version 1.54 with gcc --std=c++11. I am trying a simple use of geometry::intersection as follows: #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost/geometry/geometries/adapted/boost_polygon.hpp> using namespace boost::geometry; ...... typedef model::d2::point_xy<double> point_xy; model::polygon<point_xy> clipBounds; // add points to clipBounds model::polygon<point_xy> area; // add points to area model::polygon<point_xy> result; if(boost::geometry::intersection(area, clipBounds, result)) { std::cout << std::endl << "Boost intersection, size = " << num_points(result) << std::endl; } If I comment out the call to intersection, everything compiles. With it I get: In file included from /usr/include/boost/serialization/level.hpp:28:0, from /usr/include/boost/serialization/nvp.hpp:31, from ...: /usr/include/boost/mpl/eval_if.hpp: In instantiation of ‘struct boost::mpl::eval_if_c<false, boost::range_const_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >, boost::range_mutable_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > > >’: /usr/include/boost/range/iterator.hpp:63:63: required from ‘struct boost::range_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >’ /usr/include/boost/range/value_type.hpp:30:12: required from ‘struct boost::range_value<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >’ /usr/include/boost/geometry/algorithms/intersection.hpp:97:64: required from ‘static bool boost::geometry::dispatch::intersection<Geometry1, Geometry2, Tag1, Tag2, Reverse>::apply(const Geometry1&, const Geometry2&, GeometryOut&, const Strategy&) [with GeometryOut = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; Strategy = boost::geometry::strategy_intersection<boost::geometry::cartesian_tag, boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >, boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >, boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian>, void>; Geometry1 = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; Geometry2 = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; Tag1 = boost::geometry::polygon_tag; Tag2 = boost::geometry::polygon_tag; bool Reverse = false]’ /usr/include/boost/geometry/algorithms/intersection.hpp:201:67: required from ‘bool boost::geometry::intersection(const Geometry1&, const Geometry2&, GeometryOut&) [with Geometry1 = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; Geometry2 = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >; GeometryOut = boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> >]’ /home/stanley/workspace/worldmodel/metric/map/GISCache.cpp:2492:62: required from here /usr/include/boost/mpl/eval_if.hpp:60:31: error: no type named ‘type’ in ‘boost::mpl::eval_if_c<false, boost::range_const_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >, boost::range_mutable_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > > >::f_ {aka struct boost::range_mutable_iterator<boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double, boost::geometry::cs::cartesian> > >}’ typedef typename f_::type type; Since my code is virtually identical to the sample code in the documentation, I am very puzzled by this. What have I missed? How do I get this to compile? (I do find it odd that this error refers to boost/serialization rather than boost/geometry, but I suppose that has to do with the order of inclusion). -- View this message in context: http://boost.2283326.n4.nabble.com/geometry-Cannot-compile-boost-geometry-i… Sent from the Boost - Users mailing list archive at Nabble.com.

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[statechart] Pass event data to state constructor using triggering_event
by ramonpadilla1＠yahoo.co.uk 16 Nov '16

16 Nov '16

I would like to be able to communicate the data from an event to a state that gets constructed as a result of a transition. From this post in 2009 and this one in 2010 the use of triggering_event() is suggested. However, I can't find an example anywhere that demonstrates how to use it. Can anyone help? Links in the message | Google Groups | | | | Boost - Users - [statechart] Passing pa... | |

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