http://blog.gmane.org/gmane.comp.lib.boost.user hourly 1 1901-01-01T00:00+00:00 http://gmane.org/img/gmane-25t.png http://gmane.org http://comments.gmane.org/gmane.comp.lib.boost.user/78751 <pre>I'm trying to write a wrapper class in C++ to give mutex synchronised interprocess access to a shared memory vector of strings. This is my first foray into boost::interprocess and allocators are proving something of a mystery. Is anyone able to see why on compilation I get the error: error C2512: 'boost::interprocess::allocator::allocator' : no appropriate default constructor available C:\Program Files (x86)\Boost\boost_1_53_0\boost\container\string.hpp #ifndef SHARED_MEMORY_WRAPPER_H//if not defined already #define SHARED_MEMORY_WRAPPER_H//then define it #include &lt;boost/interprocess/managed_shared_memory.hpp&gt; #include &lt;boost/interprocess/containers/vector.hpp&gt; #include &lt;boost/interprocess/containers/string.hpp&gt; #include &lt;boost/interprocess/allocators/allocator.hpp&gt; #include &lt;boost/interprocess/sync/named_mutex.hpp&gt; using namespace boost::interprocess; class SharedMemoryWrapper { public: SharedMemoryWrapper(const std::string &amp;name, bool server) : m_name(name), m_server(server) { if (</pre> Riskybiz 2013-06-18T14:28:52 http://comments.gmane.org/gmane.comp.lib.boost.user/78748 <pre>Hello, I am wondering what the function boost::graph_traits&lt;G&gt;::null_vertex() http://www.boost.org/doc/libs/1_53_0/libs/graph/doc/Graph.html is for, and why there is no equivalent function null_edge() best regards, andreas </pre> Andreas Fabri 2013-06-18T07:51:20 http://comments.gmane.org/gmane.comp.lib.boost.user/78746 <pre>I'm trying to get what I think should be a simple example of Boost.Test (Boost 1.53) to work but I'm getting a segmentation fault, having used other of the Boost libraries from the same build/install of 1.53 without any problems. Am I doing anything obviously wrong? Thanks in advance for any help. $ cat test/cma.cpp #define BOOST_TEST_MODULE cma #include &lt;boost/test/unit_test.hpp&gt; #include &lt;iostream&gt; #include &lt;ostream&gt; BOOST_AUTO_TEST_CASE(sanity) { std::clog &lt;&lt; "Test the world!\n"; } $ make check [100%] Building CXX object CMakeFiles/test-cma.dir/test/cma.cpp.o Linking CXX executable test-cma [100%] Built target test-cma [100%] Built target check $ env DYLD_LIBRARY_PATH=${TARGET}/lib ./test-cma Running 1 test case... Test the world! Segmentation fault: 11 $ Here are some more details. I'm trying this on Mac with GCC. $ uname -a Darwin Damien-Kicks-MacBook-Pro.local 12.4.0 Darwin Kernel Version 12.4.0: \ Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 x86_64 $ ${CXX} --version g</pre> Damien Kick 2013-06-17T21:23:21 http://comments.gmane.org/gmane.comp.lib.boost.user/78744 <pre>Hello, I'm working under windows 7 with mingw. I have encountered some weird behaviour with unicode filenames. My program needs to be portable, and I'm using boost::filesystem (v 1.53) to handle the file paths. This has all been going well, until I needed to open files with unicode filenames. This is not about the content of the file, but the file's name/path. I tried the following: For testing I made a folder named C:\UnicodeTest\|????????|and I tried creating a file inside of it, by appending the file name test.txt to the boost wpath. For some reason the creation of the file fails. I'm using boost's fstreams and when I try to open the file, the failbit of the stream is set. Now the funny thing is, that when I append a foldername to the path instead, a call to create_directories() succeeds and creates the correct directory C:\UnicodeTest\|????????|\folder. I really don't understand why it won't work with a file. I have also posted my problem on stackoverflow. http://stackoverflow.com/questi</pre> Konstantin Kronfeldner 2013-06-17T14:52:56 http://comments.gmane.org/gmane.comp.lib.boost.user/78739 <pre>Hi all, I'm working with a graph that has about 16 million vertices and 320 million edges. Currently, I'm using graph-tool in Python but building the graph is far too slow. Before I start porting to C++ I starting reading up on the Parallel Boost Graph Library. From the examples in the documentation, it seems that one must build the graph on one node in the cluster, then call synchronize to send that graph to all nodes. Is there a way to build parts of the graph on each node and then synchronize those parts? Some background: the graph actually comes from a CT scan. The vertices are voxels, the edges are relationships between adjacent voxels. At the moment I'm working on a very small test volume - 256^3 voxels - but later volumes will have billions of vertices and edges. Thanks for the help. _______________________________________________ Boost-users mailing list Boost-users&lt; at &gt;lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users</pre> William Shipman 2013-06-15T21:19:54 http://comments.gmane.org/gmane.comp.lib.boost.user/78738 <pre>Hello, I have written a program in boost which simply calculates the exponent in an interval, but for some interval inputs it is giving the wrong output such as for [1,3] or [-1,3]...but for some values it is giving correct o/p such as [1,9]. Please help in solving this query. The program is appended below.... ********************************************************************************************************************************************************* #include &lt;/boost/numeric/interval.hpp&gt; #include &lt;vector&gt; #include &lt;algorithm&gt; #include &lt;utility&gt; #include &lt;iostream&gt; #include &lt;iomanip&gt; #include &lt;math.h&gt; using namespace boost; using namespace numeric; using namespace interval_lib; template&lt;class T, class Policies&gt; std::ostream &amp;operator&lt;&lt;(std::ostream &amp;os, const boost::numeric::interval&lt;T, Policies&gt; &amp;x) { os &lt;&lt; "[" &lt;&lt; x.lower() &lt;&lt; ", " &lt;&lt; x.upper() &lt;&lt; "]"; return os; } int main() { typedef interval&lt;double,policies&lt;save_state&lt;rounded_transc_opp&lt;double&gt; //t</pre> Pranjal vyas 2013-06-15T10:49:36 http://comments.gmane.org/gmane.comp.lib.boost.user/78731 <pre>Hi all, I used http://www.boost.org/doc/libs/1_53_0/libs/serialization/example/demo.cpp file as a first introduction to boost serialization. I would like to use polymorphic archives with XML serilialization format (to avoid having the templatized version). I edited this example and run it. Writing the data has worked fine -- except for the base_class serialization which needed an nvp -- but reading it causes a memory/segmentation fault problem. The same error happens with a binary archive. Using a text archive works fine. I'm new to boost serialization and debugging the code did not help me a lot. Is there anything specific to the serialization of base classes or abstract classes with the polymorphic XML format which needs to be handled? Or is this related to the serialization of pointers to the base class. Thanks for your help. Best Regards, Fadhel BA Here is the code I'm using: ( I removed some comments to make the code shorter) /////////1/////////2/////////3/////////4/////////5/////////6//</pre> Fadhel 2013-06-14T16:04:02 http://comments.gmane.org/gmane.comp.lib.boost.user/78727 <pre>Hello, I have got created an extended_p_square_quantile into an accumulator, with 3 quantils (0.25, 0.5, 0.75) as a boost::array. How can I get access to the quantil values of the accumulator? For the variance I use accumulator::variance(myacc), but a call with quantil(myacc, 0.5) does not work. Thanks Phil_______________________________________________ Boost-users mailing list Boost-users&lt; at &gt;lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users</pre> Philipp Kraus 2013-06-14T15:24:40 http://comments.gmane.org/gmane.comp.lib.boost.user/78725 <pre>Hello all, although it's called 'unordered_set', it surprised me that an unordered container could have a different ordering although its contents are the same: void f() { boost::unordered_set&lt;int&gt; uset1; uset1.insert(10); uset1.insert(9); uset1.insert(8); boost::unordered_set&lt;int&gt; uset2; uset2.insert(8); uset2.insert(9); uset2.insert(10); //uset1: 8, 9, 10 //uset2: 10, 9, 8 bool b = uset1 == uset2; //ok, they are the same } Maybe it is somewhere in the documentation, otherwise maybe add a documentation note. </pre> gast128 2013-06-14T14:58:25 http://comments.gmane.org/gmane.comp.lib.boost.user/78718 <pre>I am a newly humbled mediocre C++ programmer, who is completely unable to figure out why Boost interprocess shared memory classes frequently freeze or crash both at creation and deletion of the manager objects, both with the persistent and the windows-only non persistent versions of the classes. Do you ever debug things and it all just gets worse and worse the longer you try to fix it? http://stackoverflow.com/questions/17100597/does-boostinterprocesswindows-shared-memory-require-any-special-initializati Today I am getting crashes in the boost shared memory manager object destructor, or deadlocks in WMI calls. It's in Boost 1.53, on Visual C++ 2008, and involves DLLs. I am unable to reproduce the insanity at a top level EXE demo, and I tried to build a exe-loads DLL1, which loads DLL2, which creates boost objects, which fail when you destroy them, but I am unable to extricate it from my project. So it could be one of the lovely compiler or linker or project settings in my Visual C++ project, something </pre> Warren Postma 2013-06-14T05:47:03 http://comments.gmane.org/gmane.comp.lib.boost.user/78717 <pre>Hello, I'm a new user of statechart and for the most part am enjoying it very much. I've implemented a state machine with about 30 states (9 orthogonal regions) and over 50 events. It works very well and as expected, except for this one issue. Every once in a while, and in a way I've been unable to consistently repeat, I get an assertion failure resulting in a core dump. /usr/include/boost/statechart/state_machine.hpp:873: boost::statechart::detail::reaction_result boost::statechart::state_machine&lt;MostDerived, InitialState, Allocator, ExceptionTranslator&gt;::send_event(const event_base_type&amp;) [with MostDerived = GripperPosition, InitialState = Container, Allocator = std::allocator&lt;void&gt;, ExceptionTranslator = boost::statechart::null_exception_translator, boost::statechart::state_machine&lt;MostDerived, InitialState, Allocator, ExceptionTranslator&gt;::event_base_type = boost::statechart::event_base]: Assertion `get_pointer( pOutermostUnstableState_ ) == 0' failed. "GripperPosition" is my state_machine. "Conta</pre> Gooding, Dustin R. (JSC-ER411 2013-06-14T01:33:01 http://comments.gmane.org/gmane.comp.lib.boost.user/78716 <pre>Hi, I have just installed boost 1.53 32bit using the Sourceforge Visual Studio installer and my security software (Norton 360) has quarantined three files as being high risk: *boost_math_tr1f-vc110-mt-1_53.dll *boost_thread-vc110-mt-gd-1_53.dll *boost_filesystem-vc110-mt-gd-1_53.dll Does anyone know if this is common? Can I safely restore these files? Thanks, Scott _______________________________________________ Boost-users mailing list Boost-users&lt; at &gt;lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users</pre> Scott Alexander 2013-06-14T00:58:32 http://comments.gmane.org/gmane.comp.lib.boost.user/78713 <pre>Hello, I was trying out the new multiprecision library (kudos!), and I ran into a problem. In order to make certain guarantees in my code regarding exception safety, I am mandating that types being used in generic containers are marked noexcept() for certain basic operations (namely, destruction and move operations). It seems like this is generally guaranteed in the multiprecision library (tried with cpp_int and the mpfr adaptor), with the important exception of the gmp integer class. A glance at the headers reveals that (gmp.hpp): // // Within this file, the only functions we mark as noexcept are those that manipulate // (but don't create) an mpf_t. All other types may allocate at pretty much any time // via a user-supplied allocator, and therefore throw. // Additionally, browsing the gmp documentation yields this snippet ( http://gmplib.org/manual/Custom-Allocation.html): """ There's currently no defined way for the allocation functions to recover from an error such as out of memory, they must termin</pre> Francesco Biscani 2013-06-13T19:32:47 http://comments.gmane.org/gmane.comp.lib.boost.user/78709 <pre> Greetings. I have a class that wraps a boost::thread object, and I would like to specify certain thread attributes at construction time. My first attempt looked basically like this: struct my_thread { static boost::thread::attributes getThreadAttr() { boost::thread::attributes attrs; attrs.set_stack_size( 256 * 1024 ); return attrs; } my_thread( Runnable func ) : thread_( getThreadAttr(), func ) {} boost::thread thread_; }; But that fails: g++ -std=c++0x -o thread-attr thread-attr.cpp \ -lboost_thread-mt -lboost_system -pthread ... /usr/include/boost/thread/detail/thread.hpp:191:9: note: \ template argument deduction/substitution failed: thread-attr.cpp:48:42: note: cannot convert ‘my_thread::getThreadAttr()()’ (type \ ‘boost::thread::attributes {aka boost::thread_attributes}’) to type ‘boost::thread::attributes&amp; {aka boost::thr</pre> Anthony Foiani 2013-06-13T05:16:15 http://comments.gmane.org/gmane.comp.lib.boost.user/78707 <pre>How can I tell boost to put the libraries in a directory that I specify? If I change stage-dir, it still appends /lib onto it. Is this possible? I want my libraries in C:\trunk\third_party\ Not in C:\trunk\third_party\lib Here is my build script: cd ..\boost SET PATH=$(PATH);..\bjam bjam.exe --stagedir=../../third_party --with-thread toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-date_time toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-system toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-regex toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-program_options toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_p</pre> Christopher Pisz 2013-06-12T20:09:03 http://comments.gmane.org/gmane.comp.lib.boost.user/78703 <pre>Hi, I'm being bitten by the bug discussed here http://boost.2283326.n4.nabble.com/filesystem-segfault-in-path-imbue-after-upgrade-to-boost-1-52-td4640696.html I'm encountering this when using boost 1.50. I have to support multiple boost versions, so I may bump into this in other versions as well. From looking at the commit logs of boost svn I see that this is being worked on at the moment. But I would like to know what versions this bug affect, and if there are any ideas for a workaround. To me it looks like it affects most versions of boost filesystem, and I have been unable to come up with a workaround other than removing all use of filesystem in any place that could be called before main() has started. I would really like not having to do that! We use it quite a lot during static initialization... I've tried calling imbue(...) and codecvt() manually before using path, but that doesnt really help. The path_locale is in an anonymous namespace, which stops me from initializing it myself... Any other idea</pre> Lars Hagström 2013-06-12T07:36:23 http://comments.gmane.org/gmane.comp.lib.boost.user/78700 <pre>Hey all, I'm in the early stages of planning an independent study for my CS program and what I'm hoping to do is write a Boost.Interprocess compatible implementation of NamedPipe. However, I don't want what I create to be too closely tied to what I personally want to use. So, if you have any possible interest in utilizing such a feature, please respond and we can chat a bit about what the desirable semantics might be. Specifically I'm interested in comments on what kind of persistence people would lke, and thoughts about whether the stream should be message oriented or not (or optionally so). (see http://www.boost.org/doc/libs/1_53_0/doc/html/interprocess/some_basic_explanations.html#interprocess.some_basic_explanations.persistence for more info about what I mean by persistence). Right now, my conception of what the key features of a NamedPipe implementation would be is a stream/message oriented communication channel between to unrelated processes. thanks! </pre> Geoff Shannon 2013-06-11T22:59:31 http://comments.gmane.org/gmane.comp.lib.boost.user/78696 <pre> Dear everybody, we need to backport boost 1.49.0 to Redhat 5.2. b2 ; b2 install --prefix=/usr/local succeeds and installs libraries and headers in /usr/local as requested (g++ 4.1.2-42, 32 bit PAE kernel). However, we have a problem even linking a mostly trivial example: #include &lt;boost/filesystem.hpp&gt; int main () { copy_file(boost::filesystem::path("atest"), boost::filesystem::path("btest")); } $ g++ testBoost.cpp -lboost_filesystem -lboost_system /tmp/cc10doAS.o: In function `boost::filesystem3::copy_file(boost::filesystem3::path const&amp;, boost::filesystem3::path const&amp;)': testBoost.cpp: (.text._ZN5boost11filesystem39copy_fileERKNS0_4pathES3_[boost::filesystem3::copy_file(boost::filesystem3::path const&amp;, boost::filesystem3::path const&amp;)]+0x24): undefined reference to `boost::filesystem3::detail::copy_file(boost::filesystem3::path const&amp;, boost::filesystem3::path const&amp;, boost::filesystem3::copy_option::enum_type, boost::system::error_code*)' collect2: ld returned 1 exit status The s</pre> Stefan Schwarzer 2013-06-11T16:08:37 http://comments.gmane.org/gmane.comp.lib.boost.user/78692 <pre>Hello, I try to create a complex accumulator. I would like to use an accumulator for a box plot with the whisker data ( http://en.wikipedia.org/wiki/Box_plot ). My typedef shows at the momen like this: typedef boost::accumulators::accumulator_set&lt;double, boost::accumulators::stats&lt; boost::accumulators::tag::count, boost::accumulators::tag::sum, //boost::accumulators::tag::median, boost::accumulators::tag::mean, boost::accumulators::tag::variance, boost::accumulators::tag::min, boost::accumulators::tag::max, boost::accumulators::tag::extended_p_square I would like to create the 25% &amp; 75% quantil and replace the median with the 50% quantil, so I have defined the ctor accumulator call like this: boost::array&lt;double, 3&gt; probs = {0.25, 0.5, 0.75}; m_times[p_name] = Accumulator( boost::accumulators::extended_p_square_probabilities = probs ); (the median is disabled and m_times is a std::map&lt;std::string, Accumulator&gt;). At this point I get a compiler errors: /Developer/opt/B</pre> Philipp Kraus 2013-06-11T13:09:40 http://comments.gmane.org/gmane.comp.lib.boost.user/78690 <pre>I have been having some difficulty initializing a chrono::system_clock::time_point object. Specifically, I am trying to load a time stamp from a .pcap file using libpcap. I have a structure, pcap_pkthdr, which contains two fields: struct timeval { long tv_sec; /* seconds */ long tv_usec; /* and microseconds */ }; struct pcap_pkthdr { struct timeval ts; /* time stamp */ bpf_u_int32 caplen; /* length of portion present */ bpf_u_int32 len; /* length this packet (off wire) */ }; Where tv_sec and tv_usec are seconds and microseconds respectively relative to an epoch of Jan 1, 1970. I can use system_clock::from_time_t() to initialize the time_point to an 64-bit integer seconds (std:time_t). The question is, how do I add the microseconds to this value? My latest attempt is: void my_class::calculate_packet_statistics( const struct pcap_pkthdr *header ) { frame_interval_.intervalTimeStamp_ = system_clock::from_time_t( static_cast&lt;time_t&gt;( he</pre> Kelly, Dan 2013-06-11T12:22:07 http://comments.gmane.org/gmane.comp.lib.boost.user/78679 <pre>Hello, What is the maximum Boost Fusion tuple param count? I was thinking of using it for about 200-300 elements. Anyone done this? I've heard of defines for this, but never actually *knew* of anyone actually doing it. Thanks, Rodrigo Madera _______________________________________________ Boost-users mailing list Boost-users&lt; at &gt;lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users</pre> Rodrigo Madera 2013-06-10T18:40:09 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.lib.boost.user