July 2013 - Boost-users - lists.preview.boost.org

boost-libs failed to be built (via pkgsrc)
by Isaac Isao Saito 15 Jul '13

15 Jul '13

Hi boost-users, during source installation of `boost-libs` (link to cvs repo[0]), I get the following at the very end of long output of bmake (`make` that's used in the package manager `pkgsrc` that I use) and build seems to fail: ...skipped <pbin.v2/libs/wave/build/gcc-4.4.2/release/link-static/threading-multi>libboost_wave.a for lack of <pbin.v2/libs/wave/build/gcc-4.4.2/release/link-static/threading-multi>instantiate_cpp_exprgrammar.o... ...skipped <pstage/lib>libboost_wave.a for lack of <pbin.v2/libs/wave/build/gcc-4.4.2/release/link-static/threading-multi>libboost_wave.a... ...failed updating 181 targets... ...skipped 280 targets... *** Error code 1 Stop. bmake: stopped in /usr/pkgsrc/devel/boost-libs *** Error code 1 I noticed, out of thousands of output lines (full output[1]), some lines of error repeatedly appear. I just except some (note that they don't occur back to back like the following): g++: unrecognized option '-pthread' ./boost/cstdint.hpp:74: error: 'intleast8_t' in namespace '::' does not name a type ./boost/cstdint.hpp:76: error: 'uintleast8_t' in namespace '::' does not name a type ./boost/chrono/detail/inlined/posix/chrono.hpp:23: error: '::clock_gettime' has not been declared ./boost/chrono/detail/inlined/posix/chrono.hpp:36: error: '::clock_gettime' has not been declared ./boost/chrono/detail/inlined/posix/process_cpu_clocks.hpp:31: error: '::sysconf' has not been declared ./boost/chrono/detail/inlined/posix/process_cpu_clocks.hpp:31: error: '_SC_CLK_TCK' was not declared in this scope /usr/qnx650/host/qnx6/x86/usr/bin/ntox86-ld: cannot find -lrt ./boost/smart_ptr/detail/yield_k.hpp:123: error: 'nanosleep' was not declared in this scope ./boost/thread/pthread/timespec.hpp:84: error: '::clock_gettime' has not been declared ./boost/thread/pthread/mutex.hpp:275: error: 'boost::chrono::steady_clock' has not been declared libs/filesystem/src/operations.cpp: In function 'bool<unnamed>::remove_directory(const boost::filesystem::path&)': libs/filesystem/src/operations.cpp:345: error: '::rmdir' has not been declared libs/filesystem/src/operations.cpp:348: error: '::unlink' has not been declared libs/filesystem/src/operations.cpp:427: error: no matching function for call to 'stat::stat(const char*, stat*)' libs/filesystem/src/operations.cpp:1003: error: '::symlink' has not been declared ``` Other `boost`-related packages (namely boost-headers, boost-jam, boost-docs, boost-build) are already built and installed. `boost-python` fails to be built, but I assume it's not depended by boost-libs. Using `QNX` 6.5.0 SDP SP1. boost seems to be 1.53.0 What could be wrong? Thank you very much. [0] http://cvsweb.netbsd.org/bsdweb.cgi/pkgsrc/devel/boost-libs/#dirlist [1] http://pastebin.com/ZMU3ddXf -- Isaac

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From Big-endian to Little-endian.
by Mauro Ziliani 15 Jul '13

15 Jul '13

Hi all. This is my first post. I'm working with boost::asio::ip::tcp to dialogate with a peripheral which send frames grouped in words (16 bit values). The peripheral uses a big-endian byte-order, while the host uses a little-endian byte-order. Is there some template which makes the swap automatically? Best regards, Mauro

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VS2012: libboost_filesystem-vc110-mt-gd-1_54.lib missing
by Amann, Julian 15 Jul '13

15 Jul '13

Hello, I built boost 1.54.0 with Visual Studio 2012 x64. I tried to build a small demo that is using boost filesystem: ///////////////////////////////////////////////////////////////////// #include <iostream> #include <boost/filesystem.hpp> using namespace boost::filesystem; int main(int argc, char* argv[]) { if (argc < 2) { std::cout << "Usage: tut1 path\n"; return 1; } std::cout << argv[1] << " " << file_size(argv[1]) << '\n'; return 0; } ///////////////////////////////////////////////////////////////////// CMake is used to setup the corresponding project for VS2012 x64: ################################################# CMAKE_MINIMUM_REQUIRED(VERSION 2.8.9) PROJECT(FilesystemTest) set_property(GLOBAL PROPERTY USE_FOLDERS ON) SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/build/) # Visual Studio 2010 Pro Standard: /DWIN32 /D_WINDOWS /W3 /Zm1000 /EHsc /GR SET(CMAKE_CXX_FLAGS "/DWIN32 /D_WINDOWS /W4 /Zi /EHsc /GR- /MP /openmp") SET(CMAKE_DEBUG_POSTFIX "d") FIND_PACKAGE(Boost COMPONENTS filesystem system REQUIRED) # Unicode rules! ADD_DEFINITIONS(-D_UNICODE) include_directories(${Boost_INCLUDE_DIR}) LINK_DIRECTORIES( ${Boost_LIBRARY_DIRS} ) file(GLOB FilesystemTest_SOURCES src/*.*) # Create a target for the library ADD_EXECUTABLE(FilesystemTest ${FilesystemTest_SOURCES}) ################################################# But when compiling I get 'libboost_filesystem-vc110-mt-gd-1_54.lib' is missing. Previously I used boost 1.53.0 - everything was working perfect when using boost 1.53.0. When looking into the boost 1.54 lib folder there is only a 'boost_filesystem-vc110-mt-gd-1_54.lib' and a 'libboost_filesystem-vc110-mt-sgd-1_54.lib' I compiled boost using this instructions: 1. Download boost 1.54.0 from http://www.boost.org/ 2. Extract files (e.g. "C:\thirdparty\vs2013\x64\boost_1_54_0") 3. Start Visual Studio 2012 x64 command prompt 4. Change to boost directory (e.g. "cd C:\thirdparty\vs2010\x64\boost_1_54_0") 5. Execute .\bootstrap.bat 6. Execute b2 address-model=64 toolset=msvc-11.0 --build-type=complete stage BTW: If only certain libraries (for instance filesystem) are need step 6 can be replaced by this: b2 address-model=64 toolset=msvc-11.0 --build-type=complete stage --with-filesystem --with-signals --with-system I could not figure out what is working wrong. Any ideas? Best regards Julian

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issues compiling Boost 1.54 thread on AIX5.2
by Gert 15 Jul '13

15 Jul '13

Any clues here? Regards, Gert vacpp.compile.c++ bin.v2/libs/thread/build/vacpp/debug/address-model-64/link-static/runtime-link-static/threading-multi/pthread/thread.o xlC_r -c -DBOOST_ALL_NO_LIB=1 -DBOOST_SYSTEM_STATIC_LINK=1 -DBOOST_THREAD_BUILD_LIB=1 -DBOOST_THREAD_DONT_USE_CHRONO -DBOOST_THREAD_POSIX -qcpluscmt -qNOOPTimize -qnoinline -q64 -g -qfullpath -qfuncsect -qeh -qrtti -I"." -o "bin .v2/libs/thread/build/vacpp/debug/address-model-64/link-static/runtime-link-static/threading-multi/pthread/thread.o" "libs/thread/src/pthread/thread.cpp" "./boost/smart_ptr/shared_ptr.hpp", line 82.43: 1540-0403 (S) "template <class T, std::size_t N> struct boost::detail::sp_element<T [N]>" is already defined. "./boost/smart_ptr/shared_ptr.hpp", line 75.28: 1540-0425 (I) "sp_element<T []>" is defined on line 75 of "./boost/smart_ptr/shared_ptr.hpp". "./boost/smart_ptr/shared_ptr.hpp", line 131.43: 1540-0403 (S) "template <class T, std::size_t N> struct boost::detail::sp_dereference<T [N]>" is already defined. "./boost/smart_ptr/shared_ptr.hpp", line 124.28: 1540-0425 (I) "sp_dereference<T []>" is defined on line 124 of "./boost/smart_ptr/shared_ptr.hpp". "./boost/smart_ptr/shared_ptr.hpp", line 156.43: 1540-0403 (S) "template <class T, std::size_t N> struct boost::detail::sp_member_access<T [N]>" is already defined. "./boost/smart_ptr/shared_ptr.hpp", line 149.28: 1540-0425 (I) "sp_member_access<T []>" is defined on line 149 of "./boost/smart_ptr/shared_ptr.hpp". "./boost/smart_ptr/shared_ptr.hpp", line 181.43: 1540-0403 (S) "template <class T, std::size_t N> struct boost::detail::sp_array_access<T [N]>" is already defined. "./boost/smart_ptr/shared_ptr.hpp", line 174.28: 1540-0425 (I) "sp_array_access<T []>" is defined on line 174 of "./boost/smart_ptr/shared_ptr.hpp". "./boost/thread/detail/async_func.hpp", line 94.58: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 166.54: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 231.50: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 291.46: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 346.42: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 396.38: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 441.34: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 481.30: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 516.26: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/detail/async_func.hpp", line 546.22: 1540-0711 (S) Too few template arguments have been specified. "./boost/thread/cv_status.hpp", line 23.3: 1540-0219 (S) The call to "operator==" has no best match. "./boost/thread/cv_status.hpp", line 23.3: 1540-1229 (I) Argument number 1 is an rvalue of type "boost::cv_status::enum_type". "./boost/thread/cv_status.hpp", line 23.3: 1540-1229 (I) Argument number 2 is an rvalue of type "boost::cv_status::enum_type". "./boost/thread/cv_status.hpp", line 23.3: 1540-1202 (I) No candidate is better than "builtin operator==(int, int)". "./boost/thread/cv_status.hpp", line 23.3: 1540-1231 (I) The conversion from argument number 1 to "int" uses "an integral promotion". "./boost/thread/cv_status.hpp", line 23.3: 1540-1231 (I) The conversion from argument number 2 to "int" uses "an integral promotion". "./boost/thread/cv_status.hpp", line 23.3: 1540-1202 (I) No candidate is better than "boost::operator==(self_type, enum_type)". "./boost/thread/cv_status.hpp", line 23.3: 1540-1231 (I) The conversion from argument number 1 to "boost::cv_status" uses the user-defined conversion "boost::cv_status::cv_status(enum_type)" followed by "an lvalue-to-rvalue transformatio n". ... ... -- View this message in context: http://boost.2283326.n4.nabble.com/issues-compiling-Boost-1-54-thread-on-AI… Sent from the Boost - Users mailing list archive at Nabble.com.

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[serialization] unregistered class exception during serialization from DLL
by Andreas Mainik 14 Jul '13

14 Jul '13

Hello All, I have some classes needed to be serialized (A.HPP und A.CPP below). The serialization happens over the pointer to the base class. The code is called in the function (FUNC.CPP below). The files A.HPP, A.CPP and FUNC.CPP are constituents of a bigger DLL-library. If my test application is linked dynamical against the DLL-libary then the code throws an exception "unregistered class - derived class not registered or exported". What is wrong in my code? The code is compiled with Visual Studio 2012 (default settings). Boost: 1.53.0 If I look into BOOST_SERIALIZATION_DECL(const extended_type_info *) extended_type_info_typeid_0::get_extended_type_info( const std::type_info & ti ) const { typeid_system::extended_type_info_typeid_arg etia(ti); const tkmap & t = singleton<tkmap>::get_const_instance(); const tkmap::const_iterator it = t.find(& etia); if(t.end() == it) return NULL; return *(it); } then I see that Ord<Options> is not registered in singleton<tkmap>::get_const_instance(). Moreover, I am not able to set breakpoint into Ord<Options>::serialize(). According to MSVC debugger the breakpoint will not be hit. Additional remarks: 1) If I uncomment the code lines in FUNC.CPP then everything works. 2) If I link the code statical to my test application then everything is also fine. -----------------------A.HPP----------------------------------------------- #include "archive.hpp" // includes the required headers struct OrdBasis { virtual ~OrdBasis() {} virtual bool is_base_of(const boost::shared_ptr<OrdBasis>& derived_ptr) { return true; } private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */){ } }; template<typename P> struct Ord; struct Options { Options() {} friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */){ } }; template<> class Ord<Options> : public OrdBasis { typedef Ord<Options> P; bool is_base_of(const boost::shared_ptr<OrdBasis>& derived_ptr) { const boost::shared_ptr<P> base_ptr = boost::dynamic_pointer_cast<P>(derived_ptr); bool result = (base_ptr) ? true : false; return result; } private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */){ ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(OrdBasis); } }; BOOST_CLASS_EXPORT_KEY(Ord<Options>) -----------------------A.HPP------------------------------------------- -----------------------A.CPP------------------------------------------- #include "A.hpp" BOOST_CLASS_EXPORT_IMPLEMENT(Ord<Options>) -----------------------A.CPP------------------------------------------- I serialize with following sequence ---------------------FUNC.CPP------------------------------------------ void serializeFunc() { namespace io = boost::iostreams; typedef std::vector<char> buffer_type; buffer_type buffer; buffer.reserve(2000000); { buffer.clear(); io::stream<io::back_insert_device<buffer_type> > output_stream(buffer); boost::archive::binary_oarchive oa(output_stream, boost::archive::no_header); // begin //if the following lines are commented out then everything works //boost::shared_ptr<Ord<Options>> testOptOrd(new Ord<Options>); //oa & testOptOrd; //end boost::shared_ptr<OrdBasis> testOptOrdB(new Ord<Options>); oa & testOptOrdB; } { io::basic_array_source<char> source(&buffer[0],buffer.size()); io::stream<io::basic_array_source <char> > input_stream(source); boost::archive::binary_iarchive ia(input_stream, boost::archive::no_header); boost::shared_ptr<OrdBasis> testOptOrd; // begin linked to the above code block //ia & testOptOrd; // end ia & testOptOrd; int i = 0; } } -----------------------FUNC.CPP------------------------------------ -- Using Opera's revolutionary email client: http://www.opera.com/mail/

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[Boost.Geometry] - Union generates polygon with punctures
by Olivier Heriveaux 14 Jul '13

14 Jul '13

Hello ! I'm trying to use Boost.Geometry library to implement Minkowsky algorithm (i.e. polygon convolution). I try to implement it in the same way Boost.Polygon does, but during the algorithm execution, a boost::geometry::overlay_invalid_input_exception is raised. It seems that one of the input polygons to the union_ function is invalid. To understand my mistake, I outputed the operand polygons to SVG files and I discovered punctures in one of them. I believe Boost.Geometry thinks my polygon is self-intersecting (may be due to precision error with floats ?) - but this polygon itself is the result of a previous union operation. For info, I attached the SVG file (use inkscape to see it completely since segments are out of the box due to negative coordinates). I don't know if solutions to this problem exists or if the library is faulty (the bad polygon is the result of an union operation). One workaround would be to detect punctures and remove them, but it's kind of ugly imho... Some more details: - point coordinates type is float, - I use custom class instead of point_xy model, - polygon winding is counter-clockwise. Thank you in advance for any help, Olivier

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[multi_index][ann] Boost.MultiIndex 1.55 preview: major update with C++11 capabilities
by Joaquín Mª López Muñoz 14 Jul '13

14 Jul '13

Dear Boost.MultiIndex user: I've completed a major update of Boost.MultiIndex retrievable from the SVN repository, trunk branch, or at: https://www.dropbox.com/s/xipv129az88vgd1/multi_index_130713.zip This update includes many C++11 capabilities (most emulated by various means in pre-C++11 compilers,) among them the following: * multi_index_container is now efficiently movable employee_set extract_employees(const std::string& db); employee_set cont=extract_employees("employees.dat"); // no data copying * Initializer lists supported (if the compiler provides them) employee_set es8{{0,"Rose",40,4512},{1,"Mary",38,3345},{2,"Jo",25,7102}}; * Emplace functions es.emplace(0,"Joe",31,1123); es.get<3>().emplace_back(3,"Judy",39,6201); * Non-copyable elements allowed typeded multi_index_container< std::unique_ptr<employee>, indexed_by<...> > employee_ptr_set; How does this update affect you? 1. Of course, you can now begin using the new capabilities, even in non-C++11 compilers with some limitations (explained at the documentation). 2. Your code can get some transparent performance gain without you doing anything es.insert(employee(4,"Jill",52,3379)); // temporary's moved rather than copied 3. The internal code has been refactored to implement the new features, and this refactoring touches on preexisting functionality, hopefully without producing regressions --this has been thoroughly tested, but: It is now #3 that worries me the most: if you use Boost.MultiIndex and have some time to test this preview with your code, please do so and report the results. The more this update is tested before the official release, the less problems it will cause (ideally none.) As the update is major, every bit of testing helps. Hope you enjoy the new features. Best regards, Joaquín M López Muñoz Telefónica Digital ________________________________ Este mensaje se dirige exclusivamente a su destinatario. Puede consultar nuestra política de envío y recepción de correo electrónico en el enlace situado más abajo. This message is intended exclusively for its addressee. We only send and receive email on the basis of the terms set out at: http://www.tid.es/ES/PAGINAS/disclaimer.aspx

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Boost.Log SimpleEventLog question
by Pieter 13 Jul '13

13 Jul '13

LS, I am currently configuring my logging configuration using a property tree. When I include a SimpleEventLog sink, how can I apply an event type mapping to that sink? In the stated example this is done before the sink is added to the core: typedef sinks::synchronous_sink< sinks::simple_event_log_backend > sink_t; boost::shared_ptr< sink_t > sink(new sink_t()); sinks::event_log::custom_event_type_mapping< severity_level > mapping("Severity"); // . define mapping here . sink->locked_backend()->set_event_type_mapper(mapping); // Add the sink to the core logging::core::get()->add_sink(sink); but adding the sink happens behind the scenes when using the configuration utilities. BTW, in the section "Simplified library initialization tools" of the documentation Table 1.15 seems to miss a 'Format' parameter that I assume is still needed? Many thanks, Pieter

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[Boost.Log] More queries
by Leo Carreon 13 Jul '13

13 Jul '13

Hi everyone, As I have mentioned in a previous post, I have been trying to learn how to use Boost.Log. I have been experimenting with logging to a file with filtering and specifying the log formatting in three different ways, namely: 1. Specifying the log formatting using a lambda type expression. 2. Specifying the log formatting using a plain text string with placeholders for the attributes that I have defined. 3. Specifying the log formatting in a settings file. (However, the formatting string is exactly the same as in 2 above.) I have attached a copy of my source code and settings file. Note that I comment out parts of the source code file depending on which option I use above. The problem I’m encountering is when I use options 2 & 3 above, the severity level string does not appear in the log. But if I use option 1, the severity level string appears as expected. It is my understanding that severity level is a pre-defined attribute when using a severity_logger. Am I missing something when using options 2 & 3? If I decide to use my own severity level enumeration, what do I need to do? Kind regards, Leo

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Re: [Boost-users] Query on Boost.Log
by Leo Carreon 13 Jul '13

13 Jul '13

From: Leo Carreon Sent: Friday, July 12, 2013 8:42 AM To: Boost Users Mailing List Subject: Query on Boost.Log Hi everyone, I’m trying to learn how to use Boost.Log from Boost 1.54.0 on Fedora 18. When I attempt to call boost::log::init_from_stream() even with BOOST_LOG_DYN_LINK defined, I get the error message”undefined reference to `void boost::log::v2_mt_posix::init_from_stream<char>(std::basic_istream<char, std::char_traits<char> >&)'” for the line where I called the function. Note that I have included the header file “boost/log/utility/setup/from_stream.hpp” and added –lboost_log to my link command line. Am I missing something. I have noticed that boost::log::init_from_stream() is a template. Is an instance of this template added into the shared library? Kind regards, Leo Hi again everyone, FYI. I built Boost 1.54.0 using the following bjam options – link=shared runtime-link=shared I have also checked the build logs from the above and discovered that not all of the .cpp files in libs/log/src have been included during the build. Kind regards, Leo

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[exception] exception_ptr missing virtual base parameters
by Michael Caisse 13 Jul '13

13 Jul '13

The basic problem I'm experiencing is that getting an exception_ptr results inherited parameters getting lost when virtual inheritance is used. The code below demonstrates a simple example. "bar" is lost in the print. Changing derived_except to be: struct derived_except : base_except { int i; }; will cause the inherited values to be copied into the exception_ptr; however, this has all the standard problems associated that come with not using virtual inheritance. This looks like a bug to me. The C++11 equivalent behaves has expected and inherited values are maintained in the exception_ptr. Any thoughts? michael -------------- boost::exception_ptr version -------------- #include <boost/exception/all.hpp> #include <string> #include <iostream> struct base_except { std::string s; }; struct derived_except : virtual base_except { int i; }; int main() { derived_except e; e.i = 8; e.s = "bar"; boost::exception_ptr ptr = boost::copy_exception(e); try { boost::rethrow_exception(ptr); } catch(derived_except & e) { std::cout << "derived_except: " << e.s << " " << e.i << std::endl; } catch(...) {} return 0; } -------------- c++11 version --------------------- #include <exception> #include <string> #include <iostream> struct base_except { std::string s; }; struct derived_except : virtual base_except { int i; }; int main() { derived_except e; e.i = 8; e.s = "bar"; std::exception_ptr ptr = std::make_exception_ptr(e); try { std::rethrow_exception(ptr); } catch(derived_except & e) { std::cout << "derived_except: " << e.s << " " << e.i << std::endl; } catch(...) {} return 0; } -- Michael Caisse ciere consulting ciere.com

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Re: [Boost-users] [graph] in-depth parsing and modifications of the graph
by Orianne Siret 12 Jul '13

12 Jul '13

I mean traverse when i said parse. So the problem is i can't traverse in depth-first order my graph and modify node (or edge) properties. I wrote a basic case which doesn't work. ----------------------------------------- // Begin main.cpp #include <boost/graph/adjacency_list.hpp> #include <boost/graph/depth_first_search.hpp> #include <vector> // Node properties struct MyNode { int node_id; MyNode() : node_id() {} MyNode(int id) : node_id(id) {} }; //Edge Properties struct MyEdge { int edge_id; MyEdge() : edge_id() {} MyEdge(int id) : edge_id(id) {} }; // Graph definition typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::directedS, MyNode, MyEdge > MyGraph; typedef boost::graph_traits<MyGraph>::vertex_descriptor MyGraphVD; //My idiot visitor class my_dfs_visitor : public boost::default_dfs_visitor { public: template < typename Vertex, typename Graph > void discover_vertex(Vertex u, Graph & g) { // here i cant assign 0 to m node_id. however g is not cont.. I didn't find a code with a depth-first traversal and assign ment. g[u].node_id = 0; } }; int main() { MyGraph g; MyGraphVD vd0 = boost::add_vertex(MyNode(0), g); MyGraphVD vd1 = boost::add_vertex(MyNode(1), g); boost::add_edge(vd0, vd1, MyEdge(), g); boost::add_edge(vd1, vd0, MyEdge(), g); my_dfs_visitor visitor; boost::depth_first_search(g, boost::visitor(visitor)); return 0; } // end ------------------------------------------ This code doesn't work. I have the following error : ../main.cpp:35:3: erreur: assignment of member 'MyNode::node_id' in read-only object. (I do: "g++ -O3 -Wall -c -o main.o main.cpp " for compilation, i run on linux ubuntu 12.04 with gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3) I didn't find any example on the web.. Thanks for spending time on my problem. It is very nice of you. Best regards. Orianne Siret

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BOOST_STATIC_ASSERT with boost::array.static_size
by Anton Daneyko 12 Jul '13

12 Jul '13

Dear boost users, could someone tell me why this short program does not compile? #include <boost/array.hpp> #include <boost/static_assert.hpp> int main(int argc, const char *argv[]) { boost::array<int, 3> a1 = {{1, 1, 1}}; BOOST_STATIC_ASSERT(a1.static_size == 3); return 0; } With g++ (4.3.4) I get the following error: tmp.cpp: In function ‘int main(int, const char**)’: tmp.cpp:7: error: ‘a1’ cannot appear in a constant-expression tmp.cpp:7: error: `.' cannot appear in a constant-expression tmp.cpp:7: error: template argument 1 is invalid With icc (12.1.6) I get the following error: tmp.cpp(7): error: this operator is not allowed in a template argument expression BOOST_STATIC_ASSERT(a1.static_size == 3); ^ tmp.cpp(7): error: incomplete type is not allowed BOOST_STATIC_ASSERT(a1.static_size == 3); ^ compilation aborted for tmp.cpp (code 2) However I can compile using IBM xlC compiler. I thought that static_size is a compile time constant and can be used in this context...

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Query on Boost.Log
by Leo Carreon 11 Jul '13

11 Jul '13

Hi everyone, I’m trying to learn how to use Boost.Log from Boost 1.54.0 on Fedora 18. When I attempt to call boost::log::init_from_stream() even with BOOST_LOG_DYN_LINK defined, I get the error message”undefined reference to `void boost::log::v2_mt_posix::init_from_stream<char>(std::basic_istream<char, std::char_traits<char> >&)'” for the line where I called the function. Note that I have included the header file “boost/log/utility/setup/from_stream.hpp” and added –lboost_log to my link command line. Am I missing something. I have noticed that boost::log::init_from_stream() is a template. Is an instance of this template added into the shared library? Kind regards, Leo

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Procedure entry point _ZNSt16invalid_argumentD2Ev could not be located in the dynamic link library libstdc++-6.dll
by Joe Hays 11 Jul '13

11 Jul '13

Hello all, I have a newbie question for you. I'm trying Boost for the very first time. I'm also not terribly experienced with C++. I'm using, Eclipse Kepler (latest) Mingw 3.20 (latest) Boost_1_54_0 on a 64-bit Windows 7 machine. I followed this tutorial to configure Boost to be used with Mingw and Eclipse: http://theseekersquill.wordpress.com/2010/08/24/howto-boost-mingw/ Sections 1-6 performed as expected. The 7th and final step is when a "hello world" like application finally compiles and links Boost into a .exe. I cut-n-paste the following code from Boost's Getting Started tutorial ( http://www.boost.org/doc/libs/1_54_0/more/getting_started/windows.html) <snip> #include <boost/regex.hpp> #include <iostream> #include <string> int main() { std::string line; boost::regex pat( "^Subject: (Re: |Aw: )*(.*)" ); while (std::cin) { std::getline(std::cin, line); boost::smatch matches; if (boost::regex_match(line, matches, pat)) std::cout << matches[2] << std::endl; } } </snip> The output of the build is, <snip> 12:20:46 **** Rebuild of configuration Debug for project BoostRegexExample1 **** Info: Internal Builder is used for build g++ "-Ic:\\boost_1_54_0" -O0 -g3 -Wall -c -fmessage-length=0 -o BoostRegexExample1.o "..\\BoostRegexExample1.cpp" g++ "-LC:\\boost_1_54_0\\stage\\lib" -o BoostRegexExample1.exe BoostRegexExample1.o -lboost_regex-mgw46-mt-1_54 12:20:52 Build Finished (took 5s.992ms) </snip> If I try to run that application within Eclipse the terminal simply states the application terminated. If I go to a terminal and run the .exe (using a text file as in input as directed in the Getting Started document) I get, *"Procedure entry point _ZNSt16invalid_argumentD2Ev could not be located in the dynamic link library libstdc++-6.dll"* Any ideas why this is happening? And, what I can do to get past this? Thanks, Joe

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boost::uuid
by John Emmas 11 Jul '13

11 Jul '13

Hello there, I'm developing an app (originally written for Linux) which uses some UUID functionality that originally came from a set of e2fs utilities for Linux. I'm porting the app to Windows so naturally, the e2fs stuff doesn't build. I need to find a UUID implemntation that's more cross-platform - and of course, the obvious one to try is boost::uuid. I first installed boost when it was at version 1.40 (1-2 years ago?) Anyway, my installed version doesn't include UUID so I decided to update to a more recent version. The most recent Windows installer I could find was for version 1.51, from BoostPro:- http://www.boostpro.com/download/ Unfortunately, it probably isn't the absolute latest because BoostPro is apparently now discontinued - but it should be recent enough to include the UUID modules. From what I can gather, boost::uuid has been around since at least version 1.42. However, I hit a couple of problems:- 1) Firstly, I seem to get errors, no matter which mirror I use. I'll try again later, in case the errors go away. 2) Despite the errors, something does seem to get downloaded. However, rather than installing all the source files / DLLs etc, I just get a subdirectory called "lib" which contains a bunch of zip files (over 100). My original (1.40) installation seemed to unpack everything for me. 3) AFAICT even ver 1.51 doesn't include any UUID functionality. There was nothing for UUID that was selectable in the installer - and none of the modules look like UUID. I seem to have boost::regex, boost::filesystem, boost:date_time and a whole load of other stuff - but no boost::uuid :-( I then came across this web page which seems to suggest that all I need to do is add one header file to my existing installation (boost/uuid.hpp). Am I over-thinking this?? Is that all there is to it?? Thanks. John

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[graph] in-depth parsing and modifications of the graph
by Orianne Siret 11 Jul '13

11 Jul '13

Hello, I would like to know if it is possible to parse a boost graph in depth while being able to modify the properties of the verices you parse ? I saw there is a in-depth parser but it seems to not allow the modifications of properties ? Thanks in advance for your help ! Orianne Siret

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[asio] Incorrect reporting of bytes transferred in write handler in 1.54
by Darren 11 Jul '13

11 Jul '13

Is anybody else seeing problems with the bytes_transferred reported to the write_handler after a successful async_write? I am seeing a value of zero despite the fact that the peer receives the bytes and no error is reported to the write_handler. My example code when built against 1.54 exhibits the problem whereas building against 1.53 works correctly. I am running on Windows 7 with MSVC 2010. A couple of notes: * I only see the problem when the number of threads is > 1, even though the handlers are invoked on a strand. * Defining BOOST_ASIO_DISABLE_IOCP makes everything work properly. When running my code a failure shows itself like this: Client: Writing value 85 Server: Received 4 bytes, value 85 Client: bytesWritten = 0 In other words, the client used async_write to send 4 bytes with long value 85 the server. The server received these bytes. The client write_handler was called with no error but a bytes_transferred value of 0. Is there something I don't understand or is this a problem introduced in 1.54? #include <boost/asio.hpp> #include <boost/thread.hpp> #include <boost/thread/mutex.hpp> #include <iostream> using namespace boost::asio; const std::size_t NumThreads = 2; const unsigned short Port = 12345; // Prevent interleaved output boost::mutex logMutex; struct Server { Server(io_service& svc) : m_socket(svc), m_acceptor(svc, ip::tcp::endpoint(ip::tcp::v4(), Port)), m_buffer(0) { } void Run() { m_acceptor.accept(m_socket); // Simple blocking reads while(std::size_t bytesRead = read(m_socket, buffer(&m_buffer, sizeof(m_buffer)))) { boost::mutex::scoped_lock lock(logMutex); std::cout << "Server: Received " << bytesRead << " bytes, value " << m_buffer << std::endl; } } ip::tcp::socket m_socket; ip::tcp::acceptor m_acceptor; unsigned long m_buffer; }; struct Client { Client(io_service& svc) : m_strand(svc), m_socket(svc), m_buffer(0) { m_socket.connect( ip::tcp::endpoint(ip::address_v4::from_string("127.0.0.1"), Port)); ScheduleWrite(); } void WriteHandler(const boost::system::error_code& err, std::size_t bytesWritten) { assert(!err); if(bytesWritten != sizeof(m_buffer)) { boost::mutex::scoped_lock lock(logMutex); std::cout << "Client: bytesWritten = " << bytesWritten << std::endl; return; } ScheduleWrite(); } void ScheduleWrite() { { boost::mutex::scoped_lock lock(logMutex); std::cout << "Client: Writing value " << ++m_buffer << std::endl; } async_write(m_socket, buffer(&m_buffer, sizeof(m_buffer)), m_strand.wrap( std::bind(&Client::WriteHandler, this, std::placeholders::_1, std::placeholders::_2))); } io_service::strand m_strand; ip::tcp::socket m_socket; unsigned long m_buffer; }; int main(int argc, char* argv[]) { boost::asio::io_service svc; Server server(svc); Client client(svc); boost::thread_group threads; for(int n = 0; n < NumThreads; ++n) threads.create_thread(std::bind(&io_service::run, &svc)); server.Run(); return 0; }

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Using boost with cray c++
by avib369 . 11 Jul '13

11 Jul '13

Does any one have any experience of using boost with cray C++ compiler ? Are any known problematic areas/issues ? Ok I know its not in the official list of supported compilers, but neither is the HPUX acc, which seems to work fine for most libs. Any help appreciated . Ta, Avi

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[Boost.Log] Some few newbee questions
by Ovanes Markarian 10 Jul '13

10 Jul '13

Hi *, Thanks for the really great logging library. Just used it a bit and was amazed how useful and easy to use it was. As I start using it more and more I have some questions... 1. In my application I would like to start with the trivial logger and extend this logger with more options, i.e. attributes etc. Currently I see the following input when doing a trace: [2013-07-03 22:17:32.462265] [0x76f73180] [trace] thread_pool: creating 1 threads[2013-07-03 22:17:32.462303] [0x76f73180] [trace] thread_pool: created thread number: 1[2013-07-03 22:17:32.462312] [0x76f73180] [trace] thread_pool: all threads started[2013-07-03 22:17:32.462320] [0x76f73180] [trace] thread_pool: constructor finished My question is what is the second attribute? Thread id? As my code runs on a 64bit machine, that does not seem to be an address... 2. Is it possible to use a scoped logging with the trivial logger? I tried to do it as described in the example but see not output. How can I produce the output from the scoped logger? 3. In my example I wrote thread_pool prefix before each log entry. Can I do it automatically? How would I go on if I only have trivial logging? May be I misunderstand some concepts, like how to use multiple loggers and connect them with each other? Any help is very appreciated. Thanks, Ovanes

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Re: [Boost-users] Mutex synchronised wrapper class for boost::interprocess vector of strings
by Riskybiz 09 Jul '13

09 Jul '13

"It's not an easy task. You should catch the exception and then notify all connected processes that should disconnected from the segment (as only offline growing is supported). After that a process can call "grow" to try extend the segment. Then, all processes can attach to the newly grown segment. Think of that as a complex binary file that must be extended and internal structures changed. All users should close the file, the file should be changed by a process and then all users can start using the file again." OK Ion, thank you for that, I see.... 1. Can I ask what mechanism you would suggest for notifying the other processes to disconnect before the grow() operation? 2. Considering how to deal with the issue of dynamically growing a shared memory vector where there is one producer process and several consumers; I hit upon the notion of having the producer process use a std::vector to conventionally store data and then using a boost shared memory segment to store a pointer to the std::vector. Consumer processes would access the boost shared memory to retrieve the pointer value thus enabling access to the std::vector data store in the producer process. This, I hoped, might remove the complexities associated with dynamically growing a shared memory segment? The big question is: would it work? Would this be a valid means of interprocess communication? Or fraught with complexities? Thanks, Riskybiz.

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[msm] interrupt_state with more then one event that ends interrupt?
by Alexander Mingalev 09 Jul '13

09 Jul '13

Hi, Subj, Is that possible? for example, one event continues processing, the another one finishes the whole state-machine (some clean-up actions etc). I tried struct Interrupt : public msmf::interrupt_state< boost::mpl::vector<Foo, Bar> > {}; and struct Interrupt : public msmf::interrupt_state< msmf::ActionSequence_< boost::mpl::vector<Foo, Bar> > > {}; - has no effect. Is there another way to achieve this?

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[msm] interrupt_state with more then one event that ends interrupt?
by Sam Fisher 09 Jul '13

09 Jul '13

Hi, Subj, Is that possible? for example, one event continues processing, the another one finishes the whole state-machine (some clean-up actions etc). I tried struct Interrupt : public msmf::interrupt_state< boost::mpl::vector<Foo, Bar> > {}; and struct Interrupt : public msmf::interrupt_state< msmf::ActionSequence_< boost::mpl::vector<Foo, Bar> > > {}; - has no effect. Is there another way to achieve this?

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Boost.MultiIndex template substitution failure?
by fredbaba 08 Jul '13

08 Jul '13

I'm attempting to use boost::multi_index_container and it seems to be choking on the template metaprogramming magic somewhere. I'm getting a massive error dump ending in: /opt/local/include/boost/multi_index/hashed_index.hpp:743:9: error: ‘class boost::multi_index::detail::hashed_index, boost::hash, std::equal_to, boost::multi_index::detail::nth_layer<1, boost::intrusive_ptr, boost::multi_index::indexed_by >, boost::multi_index::ordered_non_unique, &md::Order::px> > >, std::allocator > >, boost::mpl::vector0, boost::multi_index::detail::hashed_unique_tag>’ has no member named ‘final_delete_node_’ this->final_delete_node_( I'm using Boost 1.53 (MacPorts) on Mac OS X.8 Mountain Lion. How do I get the following code to compile? Thanks. p.s. I originally posted this question on StackOverflow <http://stackoverflow.com/questions/17536227/boost-multiindex-template-subst…> but thought this might be a better forum. Sorry for the cross-post... #include <boost/multi_index_container.hpp> #include <boost/multi_index/hashed_index.hpp> #include <boost/multi_index/mem_fun.hpp> #include "Product.hpp" #include <iostream> int main(int argc, char* argv[]) { boost::multi_index_container< boost::intrusive_ptr<Product>, boost::multi_index::indexed_by< boost::multi_index::hashed_unique< boost::multi_index::const_mem_fun< Product, id_t, static_cast<id_t (Product::*)() const>(&Product::id) > >, boost::multi_index::ordered_non_unique< boost::multi_index::const_mem_fun< Product, price_t, static_cast<price_t (Product::*)() const>(&Product::price) > > > > cont; auto o = boost::intrusive_ptr<Product>(new Product()); o->id(1).price(price_t(14.75)); cont.insert(o); auto it = cont.get<1>().find(price_t(14.75)); if (it!=cont.get<1>().end()) std::cout << *(it); return 0; } -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-MultiIndex-template-substitution-f… Sent from the Boost - Users mailing list archive at Nabble.com.

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Incorrect result from mcgregor_common_subgraphs. Where can I find more example of this MCS solver?
by dante0125 08 Jul '13

08 Jul '13

Hi, I am a beginner with BGL. Currently I am using mcgregor_common_subgraphs solver to find all the common subgraphs between two graphs. The following link is the only one example showing how to use the library that I can find from the Internet. http://svn.kulitorum.com/RepSnapper/Libraries/Boost1.40/libs/graph/example/… My first question is where can I find more example of this MCS solver? My second question is why some times it can not find maximum common subgraph. By maximum I mean a common subgraph with largest number of vertices which is implemented in the code. Here I provide an example. This code is modified from mcgregor_subgraphs_example, I change the graph to undirected graph and add some vetices and edges. It is obvious that the correct answer should be of size 9. The answer return by the code missing edge 8-5 and 8-3. //======================================================================= // Copyright 2009 Trustees of Indiana University. // Authors: Michael Hansen // // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) //======================================================================= #include <fstream> #include <iostream> #include <string> #include <boost/lexical_cast.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/filtered_graph.hpp> #include <boost/graph/graph_utility.hpp> #include <boost/graph/iteration_macros.hpp> #include <boost/graph/mcgregor_common_subgraphs.hpp> #include <boost/property_map/shared_array_property_map.hpp> using namespace boost; // Callback that looks for the first common subgraph whose size // matches the user's preference. template <typename Graph> struct example_callback { typedef typename graph_traits<Graph>::vertices_size_type VertexSizeFirst; example_callback(const Graph& graph1) : m_graph1(graph1) { } template <typename CorrespondenceMapFirstToSecond, typename CorrespondenceMapSecondToFirst> bool operator()(CorrespondenceMapFirstToSecond correspondence_map_1_to_2, CorrespondenceMapSecondToFirst correspondence_map_2_to_1, VertexSizeFirst subgraph_size) { // Fill membership map for first graph typedef typename property_map<Graph, vertex_index_t>::type VertexIndexMap; typedef shared_array_property_map<bool, VertexIndexMap> MembershipMap; MembershipMap membership_map1(num_vertices(m_graph1), get(vertex_index, m_graph1)); fill_membership_map<Graph>(m_graph1, correspondence_map_1_to_2, membership_map1); // Generate filtered graphs using membership map typedef typename membership_filtered_graph_traits<Graph, MembershipMap>::graph_type MembershipFilteredGraph; MembershipFilteredGraph subgraph1 = make_membership_filtered_graph(m_graph1, membership_map1); // Print the graph out to the console std::cout << "Found common subgraph (size " << subgraph_size << ")" << std::endl; print_graph(subgraph1); std::cout << std::endl; // Explore the entire space return (true); } private: const Graph& m_graph1; VertexSizeFirst m_max_subgraph_size; }; int main (int argc, char *argv[]) { // Using a vecS graph here so that we don't have to mess around with // a vertex index map; it will be implicit. typedef adjacency_list<listS, vecS, undirectedS, property<vertex_name_t, unsigned int, property<vertex_index_t, unsigned int> >, property<edge_name_t, unsigned int> > Graph; typedef graph_traits<Graph>::vertex_descriptor Vertex; typedef graph_traits<Graph>::edge_descriptor Edge; typedef property_map<Graph, vertex_name_t>::type VertexNameMap; typedef property_map<Graph, edge_name_t>::type EdgeNameMap; // Test maximum and unique variants on known graphs Graph graph_simple1, graph_simple2; example_callback<Graph> user_callback(graph_simple1); VertexNameMap vname_map_simple1 = get(vertex_name, graph_simple1); VertexNameMap vname_map_simple2 = get(vertex_name, graph_simple2); // Graph that looks like a triangle put(vname_map_simple1, add_vertex(graph_simple1), 1); put(vname_map_simple1, add_vertex(graph_simple1), 2); put(vname_map_simple1, add_vertex(graph_simple1), 3); put(vname_map_simple1, add_vertex(graph_simple1), 4); put(vname_map_simple1, add_vertex(graph_simple1), 5); put(vname_map_simple1, add_vertex(graph_simple1), 6); put(vname_map_simple1, add_vertex(graph_simple1), 7); put(vname_map_simple1, add_vertex(graph_simple1), 8); put(vname_map_simple1, add_vertex(graph_simple1), 9); add_edge(0, 1, graph_simple1); add_edge(0, 2, graph_simple1); add_edge(0, 4, graph_simple1); add_edge(1, 2, graph_simple1); add_edge(1, 3, graph_simple1); add_edge(1, 6, graph_simple1); add_edge(2, 3, graph_simple1); add_edge(2, 4, graph_simple1); add_edge(3, 5, graph_simple1); add_edge(4, 5, graph_simple1); add_edge(5, 6, graph_simple1); add_edge(7, 8, graph_simple1); add_edge(6, 7, graph_simple1); add_edge(8, 5, graph_simple1); add_edge(8, 3, graph_simple1); std::cout << "First graph:" << std::endl; print_graph(graph_simple1); std::cout << std::endl; // Triangle with an extra vertex put(vname_map_simple2, add_vertex(graph_simple2), 1); put(vname_map_simple2, add_vertex(graph_simple2), 2); put(vname_map_simple2, add_vertex(graph_simple2), 3); put(vname_map_simple2, add_vertex(graph_simple2), 4); put(vname_map_simple2, add_vertex(graph_simple2), 5); put(vname_map_simple2, add_vertex(graph_simple2), 6); put(vname_map_simple2, add_vertex(graph_simple2), 7); put(vname_map_simple2, add_vertex(graph_simple2), 8); put(vname_map_simple2, add_vertex(graph_simple2), 9); add_edge(0, 1, graph_simple2); add_edge(0, 2, graph_simple2); add_edge(0, 4, graph_simple2); add_edge(1, 2, graph_simple2); add_edge(1, 5, graph_simple2); add_edge(2, 4, graph_simple2); add_edge(3, 5, graph_simple2); add_edge(3, 6, graph_simple2); add_edge(7, 8, graph_simple2); add_edge(1, 6, graph_simple2); add_edge(6, 7, graph_simple2); add_edge(8, 5, graph_simple2); add_edge(8, 3, graph_simple2); std::cout << "Second graph:" << std::endl; print_graph(graph_simple2); std::cout << std::endl; // Maximum subgraphs // Maximum, unique subgraphs std::cout << "mcgregor_common_subgraphs_unique:" << std::endl; mcgregor_common_subgraphs_unique (graph_simple1, graph_simple2, true, user_callback, vertices_equivalent(make_property_map_equivalent(vname_map_simple1, vname_map_simple2))); std::cin.get(); return 0; } -- View this message in context: http://boost.2283326.n4.nabble.com/Incorrect-result-from-mcgregor-common-su… Sent from the Boost - Users mailing list archive at Nabble.com.

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