October 2016 - Boost-users - lists.boost.org

[geometry] Stable and fast rtree serialize/de-serialize
by 邓尧 27 Oct '16

27 Oct '16

Hi all, How can I serialize/deserialize a Boost.Geometry rtree reliably and efficiently ? I tried the experimental rtree serialization support built-in (-DBOOST_GEOMETRY_INDEX_DETAIL_EXPERIMENTAL=1), I found that the implementation was unstable and failed to deserialize sometimes. I don't even know whether it corrupted any of the tree nodes. I also implemented a slow hack: save all tree nodes during serialization and rebuild the rtree during deserialization. I want something faster. Serialization time isn't important to me, I just need a faster deserialization (as fast as the experimental implementation) Thanks

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Building Boost with VS15 Preview 5
by Trueman, Chris 26 Oct '16

26 Oct '16

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Can't catch Boost.Asio exceptions inside coroutines
by Sergey Shpikin 25 Oct '16

25 Oct '16

I have this little example of Boost.Asio code: http://codepad.org/tuQedXI7 It works as expected on Linux producing 1 2 Caught Host not found (authoritative) but on Windows it crashes with: 1 2 terminate called after throwing an instance of 'boost::system::system_error' what(): Unknown error Tested on Windows Server 2008, Windows 7 and Wine, everything is the same. I'm compiling on Linux for Windows with MXE ( http://mxe.cc/ ) on GCC 4.9.4, Boost version is 1.60.0. I'm really stuck at this point as nothing in Google looks a valid solution for the case and I already have a working application on Linux but it crashes on any network error on Windows. On Windows coroutines prevent any exceptions from being caught when the program is compiled with -O1/2/3 but they're caught with -O0 or -Os (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54267 — this is about GCC on FreeBSD but the same seemingly applies to MinGW). However, boost's own exceptions, like the aforementioned boost::system::system_error, still can't be caught.

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boost @ Meeting C++ 2016
by Jens Weller 24 Oct '16

24 Oct '16

Hello boost community, a short and final reminder, that the Meeting C++ conference is just a few weeks away! A few tickets are still available, here is the schedule: https://meetingcpp.com/index.php/schedule16.html The schedule also has the link to the student program and diversity tickets! Also there is still a few places available in the boost workshop with Boris Schäling and Michael Caisse. I plan to have a meetup for boost users in one of the breaks in the upper lounge, so that the boost communtiy is able to actually meet at Meeting C++! thanks, Jens Weller

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boost asio ssl read issue
by Ananth 24 Oct '16

24 Oct '16

Hi, I have posted the question here at StackForge with all the details. http://stackoverflow.com/questions/40163626/boost-asio- ssl-not-working-as-expected-when-used-with-null-buffers Basically, http://www.boost.org/doc/libs/1_40_0/doc/html/ boost_asio/overview/core/reactor.html did not work when used with ssl. With plain-tcp steam socket, it works fine. o If we do ssl_socket->lowest_layer().async_read_some(null_buffers(), read_cb), then we do get all data in read_cb, but read_cb keep getting called endlessly (and read_some then returns 0, with error 11 resource unavailable) (This causes cpu remain over-utilized for ever) If we do ssl_socket->async_read_some(null_buffers(), read_cb), then it works fine with small amounts of data. When larger data is to be received (~20MB or so), then not all data is received. around 1% of data towards the end is never received by the application. My guess is that data is sitting in openssl library some where I tried with latest ssl and boost code, but that did not help either. Can some one please help ? Thanks, Ananth

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Filesystem recursive iterator issues
by mlimber 24 Oct '16

24 Oct '16

I have this code, which does a simple recursive directory iteration and prints each directory entry and then does it again ( http://coliru.stacked-crooked.com/a/0bfab95a513ebed8 ): #include <boost/filesystem.hpp> #include <boost/range/iterator_range.hpp> #include <iostream> namespace fs = boost::filesystem; int main() { try { const auto iter = fs::recursive_directory_iterator{ "." }; for( const auto& entry : boost::make_iterator_range( iter, {} ) ) { std::cout << entry << "\n"; } // Rinse and repeat std::cout << "\n"; for( const auto& entry : boost::make_iterator_range( iter, {} ) ) // CRASH -- Replace 'iter' with 'fs::recursive_directory_iterator{"."}' and it will work. //for( const auto& entry : boost::make_iterator_range( fs::recursive_directory_iterator{"."}, {} ) ) { std::cout << entry << "\n"; } } catch( const std::exception& e ) { std::cerr << e.what() << "\n"; } catch( ... ) { std::cerr << "Unknown exception.\n"; } } As you can see at Coliru, it crashes. (It also crashes on Visual Studio 2012 and with Boost 1.55.0 and on Coliru with <experimental/filesystem> instead of Boost.) Similarly, using a filesystem iterator with std::distance() fails when the iterator passed in is used again later (with boost: http://coliru.stacked-crooked.com/a/1b06dca057872762 and with experimental/filesystem: http://coliru.stacked-crooked.com/a/7bd5e73f1444619d ). It seems that something in the state of the *constant* iterator gets confused or corrupted after it is advanced to the end. I have a workaround for it commented out in the code. I found this possibly related issue: https://svn.boost.org/trac/boost/ticket/11910 Am I missing something? Should I file a new bug report? Cheers! M

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When to use BOOST_ALL_DYN_LINK?
by Florian Lindner 24 Oct '16

24 Oct '16

Hello, http://www.boost.org/doc/libs/1_62_0/libs/log/doc/html/log/installation/con… says: BOOST_LOG_DYN_LINK If defined in user code, the library will assume the binary is built as a dynamically loaded library ("dll" or "so"). Otherwise it is assumed that the library is built in static mode. This macro must be either defined or not defined for all translation units of user application that uses logging. This macro can help with auto-linking on platforms that support it. BOOST_ALL_DYN_LINK Same as BOOST_LOG_DYN_LINK but also affects other Boost libraries the same way. We build our library in a dynamic and a static version using SCons: staticlib = env.StaticLibrary ( target = buildpath + '/libprecice', source = [sourcesPreCICE] ) env.Alias("staticlib", staticlib) solib = env.SharedLibrary ( target = buildpath + '/libprecice', source = [sourcesPreCICE] ) env.Alias("solib", solib) Both have BOOST_LOG_DYN_LINK set: env.Append(CPPDEFINES=["BOOST_LOG_DYN_LINK"]) However, I wonder if this is correct. Should DYN_LINK only be set when building the dynamically linked lib? Thanks, Florian

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Update the index of a hashed_non_unique entry in boost::multiindex
by Ram 24 Oct '16

24 Oct '16

I have a boost::multiindex container which has an index as follows : boost::multi_index::hashed_non_unique< boost::multi_index::tag<IndexByNonUniqueId>, boost::multi_index::const_mem_fun<StoredObj, std::string, &StoredObj::getNonUniqueIdString> > This ID comes in as ""(empty string) when I initially get the object. I add it to the multiindex at this point. But later in the course of the program the ID gets populated using its "setNonUniqueId" method. At this point of time inside "setNonUniqueId" I would like to update the index to the object(in the multiindex) as well(while the ID is being updated from "" to something concrete). How do I do this? How do I locate the specific object and update the index? -R

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upgrade from boost 1.39 to boost 1.50. Issue with regex_match
by MAURICE Jean 21 Oct '16

21 Oct '16

Hi, I am 'upgrading' a huge C++ app from VS2005 (32bits) to VS2010 (64 bits) and boost 1.39 to boost 1.50. This app runs both under Windows and Linux. In a function that searchs subdirectories and files of a given directory, we get the list of all the elements and then this list is filtered by : if(true==boost::regex_match(sAdaptation, what, childNode.infoNode.rFullPathFilePattern)) sAdaptation is ".\TEST\un_noeud" (this subdirectory exists) childNode.infoNode.rFullPathFilePattern is something like {m_pimpl={...}} And regex_match always returns false. If you can give me information about what is happening ... Jean

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build boost 1.58 failed on centos 7.2
by Glenn WANG 20 Oct '16

20 Oct '16

hi, I try to build boost 1.58 on CentOS, but it cannot be done, there're many errors. could anybody help? thanks. ============================== ./b2 --with-log -q gcc.compile.c++ bin.v2/libs/system/build/gcc-4.8.5/release/threading-multi/error_code.o In file included from libs/system/src/error_code.cpp:19:0: ./boost/system/detail/error_code.ipp:48:27: error: expected ‘;’ at end of member declaration const char * name() const BOOST_SYSTEM_NOEXCEPT; ^ ./boost/system/detail/error_code.ipp:48:33: error: ‘BOOST_SYSTEM_NOEXCEPT’ does not name a type const char * name() const BOOST_SYSTEM_NOEXCEPT; ^ ./boost/system/detail/error_code.ipp:56:32: error: expected ‘;’ at end of member declaration const char * name() const BOOST_SYSTEM_NOEXCEPT; ^ ./boost/system/detail/error_code.ipp:56:38: error: ‘BOOST_SYSTEM_NOEXCEPT’ does not name a type const char * name() const BOOST_SYSTEM_NOEXCEPT;

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