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[Interprocess] Using existing containers after grow()
by Malko 10 Mar '15

10 Mar '15

Hi, I am having some difficulties understanding the relationship between allocators for containers and grow(). Let's say I create a vector (whatever type) in shmem, then I unmap everything and proceed to grow the shmem from 1MB to 2MB and remap. I can now access my old vector and start adding new entries. What I am unsure about is: would this vector be able to create new entries until the whole 2MB are allocated, or would it stop at 1? I have not seen anywhere in the docs any warning about the need to construct new containers after a grow, so I assume my vector can grow up to to 2MB now. Then my question is: how does it know that now it can grow up to 2MB if the allocator I passed on construction was instantiated from a segment_manager that knew about a shmem of size 1MB? Is there somewhere in shared memory a segment_manager-like object that stores info about the shmem itself (and can I access it in my code)? Any help would be greatly appreciated, Malko

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[heap] Mix use of size_t and size_type
by Matthias Meulien 09 Mar '15

09 Mar '15

Hi, While reading d_ary_heap.hpp from the heap library I was surprised to see a mix of size_t and size_type variables in an index computation (https://github.com/boostorg/heap/blob/master/include/boost/heap/d_ary_heap.…) size_type last_child_index(size_type index) const { const size_t first_index = first_child_index(index); const size_type last_index = (std::min)(first_index + D - 1, size() - 1); return last_index; } Isn't this a typo? -- Matthias

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[boost.geometry] buffer distance strategies
by gchlebus 09 Mar '15

09 Mar '15

Hi, I am wondering whether it would be possible to achieve anisotropic buffering (distances in neg x, pos x, neg y, pos y can have different values) of a polygon using the buffer function with custom-implemented distance strategy. What I want to achieve is presented on the figure 2-b in the following paper: http://itcnt05.itc.nl/agile_old/Conference/mallorca2002/proceedings/posters… I would be grateful to hear from you whether it is doable, and if positive, how one could implement such a custom distance strategy. Best, -- View this message in context: http://boost.2283326.n4.nabble.com/boost-geometry-buffer-distance-strategie… Sent from the Boost - Users mailing list archive at Nabble.com.

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multi_index: iterator_to complexity
by Matwey V. Kornilov 09 Mar '15

09 Mar '15

Hi, The following two calls have constant complexity (according to docs) for all indices: iterator iterator_to(const value_type& x); const_iterator iterator_to(const value_type& x) const; As far as I understand, the single way to reach the constant complexity in searching by pointer is to store the objects in continuous memory area. Is it correct?

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Flood of messages when building with boost_serialization
by Tony Camuso 09 Mar '15

09 Mar '15

Using Fedora 21 64 bit gcc 4.9.2 Qt Creator 3.2.1 Qt 5.3.2 When I run make from the command line, all is well. $ g++ -Wall -c kabi-serial.cpp -lboost_serialization ### no errors ### Even if I build the whole project from the command line, there are no errors. $ g++ -Wall -o kabi-parser -x c kabi.c -x c checksum.c -x c++ kabi-node.cpp -x c++ kabi-serial.cpp -lboost_serialization -lsparse However, when I build it from Qt, I get the following compiler output. I understand the "unused parameter" message, as I'm not using versioning in my serialization implementation. I haven't tried executing the serialization code, yet, but I wonder if it will even execute properly, given the nature of the messages. The rest of the code executes fine. The serialization code is very simple and follows the messages. 20:38:17: Starting: "/usr/bin/make" kabi-serial.o g++ -c -pipe -g -Wall -W -fPIE -I/home/tcamuso/Qt5.3.2/5.3/gcc_64/mkspecs/linux-g++ -I../../kabi -I../src/sparse -I../src/sparse -I. -o kabi-serial.o ../src/kabi-serial.cpp In file included from ../src/kabi-serial.cpp:14:0: ../src/kabi-serial.h: In instantiation of 'void Cqnodelist::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_oarchive]': /usr/include/boost/serialization/access.hpp:118:9: required from 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive; T = Cqnodelist]' /usr/include/boost/serialization/serialization.hpp:69:69: required from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive; T = Cqnodelist]' /usr/include/boost/serialization/serialization.hpp:128:27: required from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive; T = Cqnodelist]' /usr/include/boost/archive/detail/oserializer.hpp:152:5: required from 'void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::text_oarchive; T = Cqnodelist]' /usr/include/boost/archive/detail/oserializer.hpp:101:1: required from 'class boost::archive::detail::oserializer<boost::archive::text_oarchive, Cqnodelist>' /usr/include/boost/archive/detail/oserializer.hpp:253:13: [ skipping 2 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ] /usr/include/boost/archive/detail/oserializer.hpp:314:44: required from 'static void boost::archive::detail::save_non_pointer_type<Archive>::invoke(Archive&, T&) [with T = Cqnodelist; Archive = boost::archive::text_oarchive]' /usr/include/boost/archive/detail/oserializer.hpp:525:24: required from 'void boost::archive::save(Archive&, T&) [with Archive = boost::archive::text_oarchive; T = Cqnodelist]' /usr/include/boost/archive/detail/common_oarchive.hpp:69:40: required from 'void boost::archive::detail::common_oarchive<Archive>::save_override(T&, int) [with T = Cqnodelist; Archive = boost::archive::text_oarchive]' /usr/include/boost/archive/basic_text_oarchive.hpp:80:9: required from 'void boost::archive::basic_text_oarchive<Archive>::save_override(T&, int) [with T = Cqnodelist; Archive = boost::archive::text_oarchive]' /usr/include/boost/archive/detail/interface_oarchive.hpp:63:9: required from 'Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = Cqnodelist; Archive = boost::archive::text_oarchive]' ../src/kabi-serial.cpp:42:9: required from here ../src/kabi-serial.h:54:50: warning: unused parameter 'version' [-Wunused-parameter] void serialize(Archive & ar, const unsigned int version) ^ 20:38:17: The process "/usr/bin/make" exited normally. 20:38:17: Elapsed time: 00:00. ------------- source code ---------------------- #include <boost/serialization/vector.hpp> #include <boost/archive/text_oarchive.hpp> using namespace std; namespace boost { namespace serialization { class Cqnodelist { public: friend class boost::serialization::access; Cqnodelist(){} vector<int>qnodelist; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & qnodelist; } }; void kb_write_list () { Cqnodelist ql; ofstream ofs("kabi-list.dat"); { boost::archive::text_oarchive oa(ofs); oa << ql; } } } // namespace serialization } // namespace boost

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multi_index: thread safety
by Matwey V. Kornilov 08 Mar '15

08 Mar '15

Hi, I have a multi_index container and would like to make concurrent READs. Is it thread-safe? I mean that there could be mutable members inside the object, so calling formally const functions leaded to concurrent writes.

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Call for Papers Meeting C++ 2015
by Jens Weller 05 Mar '15

05 Mar '15

Hello boost community! I'd like to inform you that the call for papers for this years Meeting C++ conference is running! It will end at April 5th, boost related talks are very welcome! This years conference will be again at the Andels Hotel in Berlin, on the 4th and 5th december. It will feature 2 keynotes and 4 Tracks a 7 Talks, this years theme track is "embedded and IoT". There is again also a student program, which will be announced later. Call for Papers: http://meetingcpp.com/index.php/newsreader/items/call-for-papers-for-meetin… Announcement: http://meetingcpp.com/index.php/newsreader/items/announcing-meeting-c-2015.… kind regards, Jens Weller

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Boost integration with VxWorks
by Hashemian, Mehdi 04 Mar '15

04 Mar '15

Hello, May the Maintainer please kindly contact me? I need help to investigate how to provide an official port of Boost for VxWorks Operating Systems so that it works out of the box. Best Regards, Mehdi Hashemian, Product Manager, Wind River

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Statechart serialization
by mbrodeur65 04 Mar '15

04 Mar '15

Hi, I'm looking for a solution to serialize boost::statechart objects. I'm aware that this feature is on the statechart library todo list but was wondering if there are any workaround to achieve this with the latest boost release (1.34) ? thanks for your help ! mbrodeur65 -- View this message in context: http://www.nabble.com/Statechart-serialization-tf4131326.html#a11749139 Sent from the Boost - Users mailing list archive at Nabble.com.

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Bus Error 10 on Mac OS
by Vinay Kumar 04 Mar '15

04 Mar '15

Hi, We are using boost libraries(version 1.56.0) in our application(32bit application). Our application crashes only Mac OS(10.8) platform with Bus Error 10. $gdb ./ourapp core.xxx GNU gdb 6.3.50-20050815 (Apple version gdb-1705) (Fri Jul 1 10:50:06 UTC 2011) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared li braries ........ done Core was generated by `./ourapp'. Reading symbols for shared libraries . done Reading symbols for shared libraries ........................................... ................................................................................ ............ done #0 0x98218aa2 in __semwait_signal () (gdb) bt #0 0x98218aa2 in __semwait_signal () #1 0x9821875e in _pthread_cond_wait () #2 0x9821a3f8 in pthread_cond_wait$UNIX2003 () #3 0x0000f1f1 in std::_Rb_tree<std::string, std::string, std::_Identity<std::string>, std::less<std::string>, std::allocator<std::string> >::_M_erase () #4 0x0000b6f4 in ?? () #5 0x000025a1 in ?? () #6 0x0000af63 in ?? () #7 0x00002035 in ?? () (gdb) t 2 (gdb) bt #0 0x98218aa2 in __semwait_signal () #1 0x9821875e in _pthread_cond_wait () #2 0x9821a3f8 in pthread_cond_wait$UNIX2003 () #3 0x0000f1f1 in std::_Rb_tree<std::string, std::string, std::_Identity<std::string>, std::less<std::string>, std::allocator<std::string> >::_M_erase () #4 0x0000b6f4 in ?? () #5 0x00016206 in boost::exception_detail::set_info<boost::exception_detail::clone_impl<boost::exception_detail::bad_alloc_> > () #6 0x0001ce4e in std::vector<std::string, std::allocator<std::string> >::_M_insert_aux () #7 0x0001cdb9 in std::vector<std::string, std::allocator<std::string> >::_M_insert_aux () #8 0x0001cd1c in std::vector<std::string, std::allocator<std::string> >::_M_insert_aux () #9 0x0001caaf in std::vector<std::string, std::allocator<std::string> >::_M_insert_aux () #10 0x001dba1b in boost::this_thread::get_id () #11 0x001db13c in boost::this_thread::get_id () #12 0x0087866e in icu_44::ServiceListener::~ServiceListener () #13 0x98218259 in _pthread_start () #14 0x982180de in thread_start () Can anybody explain the root cause of the problem? This crash happens only on Mac OS. While building boost libraries on Mac OS, do we need to set any extra flags? NOTE: Our application runs successfully on other platforms without any problem. Regards,Vinay

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