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[MSM] stack overflow happens when there is afalse-guard anonymous transition
by Christophe Henry 06 Sep '10

06 Sep '10

<snip> >When start() got called in main(), it will enter a endless reentering between state_machine::process_event() and >state_machine::handle_eventless_transitions_helper::process_completion_event(). Finally it caused a stack overflow. > > >Could somebody please help me to fix this problem? Hi, The problem is that UML does not specify how often an anonymous transition should be "tried" and I probably chose the wrong solution (to try again and again). So, as your guard always returns false, msm keeps trying, which means calls to process_event() until the stack overflows. The solution probably is to try just once but it will force you to manually try to reprocess by calling, say a process() function without event, but it arguably simply means passing the buck to you. Please let me think about it a bit more, I'd like to think this out a bit more. For the moment, I suggest you to either write a useful guard or revert to a named event, which you will process when it makes sense in your application. Regards, Christophe

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How to work with large files in boost ?
by Timothy Madden 06 Sep '10

06 Sep '10

Hello Can I open and work with 64bit files (over 2Gb) in boost ? I see iostreams library has a stream<file_descriptor>off_type of long, which is 32 bit ... Thank you, Timothy Madden

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Can I create and open a file only if it does not exist ?
by Timothy Madden 05 Sep '10

05 Sep '10

Hello I see file_descriptor_sink uses the openmode flags from std::ios_base, and also file class actually calls the open function standard C++ basic_filebuf. I would like to open a temporary file (generated with unique_path) only if it does not exist, as if by POSIX open() with O_CREAT | E_EXCL, and no combination of ios_base::openmode flags allows for that. Is there a way in boost to create and open a file only if it does not exist ? Thank you, Timothy Madden

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combining mpl sequences
by Karsten Ahnert 05 Sep '10

05 Sep '10

Hi, I have a templatized mpl-vector template< class T > class containers : public mpl::vector< std::vector< T > , std::list< T > , std::deque< T > > { }; and a mpl-vector holding some types: typedef mpl::vector< float , double , long double >::type my_types; Is there a simple way to build a mpl vector which contains the elements of the first vector with template arguments of the second vector, hence mpl:vector< std::vector< float > , std::vector< double > , std::vector< long double > , std::list< float > , std::list< double > , std::list< long double > , std::deque< float > , std::deque< double > , std::deque< long double > > I can do this manually with mpl::insert_range typedef mpl::insert_range< mpl::vector0<> , mpl::end< mpl::vector0<> >::type , containers< mpl::at< my_types , mpl::int_<0> >::type > >::type first; typedef mpl::insert_range< first , mpl::end< first >::type , containers< mpl::at< my_types , mpl::int_<1> >::type > >::type second; typedef mpl::insert_range< second , mpl::end< second >::type , containers< mpl::at< my_types , mpl::int_<2> >::type > >::type all_containers; But this way is not very elegant. Does some has any hints how to do this automatically? Best regards, Karsten

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cstdint.hpp on MSVC inconsitency ?
by joel falcou 05 Sep '10

05 Sep '10

In cstdint.hpp, the logic is that , if sizeof(long) == 4 then int32_t = long elseif sizeof(int) == 4 then int32_t = int. However, boost::detail::int_least_helper assumes sizeof(long) > sizeof(int). The consequence is that int_t<32>::fast is not the same as int32_t on MSVC while MSVC always garantee that int == long. Is there any rationale we missed or should I try to fix that as it currently prevent nT2 from compiling on MSVC . Regards

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Mingw: The input line is too long
by Joost Kraaijeveld 05 Sep '10

05 Sep '10

Hi, When I compile Boost i get the following error (for several libraries): F:\boost_1_42_0>"g++" "-Wl,--out-implib,bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\boost_serialization-mt-d.lib" -o "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\boost_serialization-mt-d.dll" -shared -Wl,--start-group "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_archive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_iarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_iserializer.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_oarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_oserializer.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_pointer_iserializer.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_pointer_oserializer.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_serializer_map.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_text_iprimitive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_text_oprimitive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_xml_archive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\binary_iarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\binary_oarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\extended_type_info.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\extended_type_info_typeid.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\extended_type_info_no_rtti.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\polymorphic_iarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\polymorphic_oarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\stl_port.o" "bin.v2\libs\se The input line is too long. "g++" "-Wl,--out-implib,bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\boost_serialization-mt-d.lib" -o "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\boost_serialization-mt-d.dll" -shared -Wl,--start-group "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_archive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_iarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_iserializer.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_oarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_oserializer.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_pointer_iserializer.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_pointer_oserializer.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_serializer_map.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_text_iprimitive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_text_oprimitive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\basic_xml_archive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\binary_iarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\binary_oarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\extended_type_info.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\extended_type_info_typeid.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\extended_type_info_no_rtti.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\polymorphic_iarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\polymorphic_oarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\stl_port.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\text_iarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\text_oarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\void_cast.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\archive_exception.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\xml_grammar.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\xml_iarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\xml_oarchive.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\xml_archive_exception.o" "bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\shared_ptr_helper.o" -Wl,-Bstatic -Wl,-Bdynamic -Wl,--end-group -g -mthreads ...failed gcc.link.dll bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\boost_serialization-mt-d.lib bin.v2\libs\serialization\build\gcc-mingw-4.5.0\debug\threading-multi\boost_serialization-mt-d.dll... I have tried to compile Boost in the directory "b" and/or with the options "--md5" and/or "--abbreviate-paths" but nothing helped. As mingw is advertised in the "Boost's additional test compilers include:" section I guess that i (in theory) should be possible to compile it. Does anyone hav any idea how to achieve this? How can I compile Boost 1.42 using Mingw both static AND dynamic? TIA -- Groeten, Joost Kraaijeveld Askesis B.V. Molukkenstraat 14 6524NB Nijmegen tel: 024-3888063 / 06-51855277 fax: 024-3608416 web: www.askesis.nl

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How to use %e for the format of time_input_facet?
by xiada74＠sina.com 05 Sep '10

05 Sep '10

I tried the below code:   #include <boost/date_time.hpp> #include <boost/date_time/posix_time/ptime.hpp> #include <iostream> using namespace boost::posix_time; int main() {     std::string _format1 = "%Y-%m-%d %H:%M:%S";     std::string _format2 = "%Y-%m-%e %H:%M:%S";     std::string teststring = "2010-09-10 10:01:01";     ptime time1, time2;     time_input_facet facet1(_format1, 1);     time_input_facet facet2(_format2, 1);     std::stringstream ss1(teststring);     std::stringstream ss2(teststring);     ss1.imbue(std::locale(ss1.getloc(), &facet1));     ss1 >> time1;     ss2.imbue(std::locale(ss2.getloc(), &facet2));     ss2 >> time2;     std::cout << "Time1: " << time1 << std::endl;     std::cout << "Time2: " << time2 << std::endl;     return 0; } The output is:   Time1: 2010-Sep-10 10:01:01 Time2: not-a-date-time Who can help to fix the issue for the format using "%e"?   Thanks in advance!

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Boilerplate generated code
by Ryan McConnehey 05 Sep '10

05 Sep '10

I have a class that mostly remains the same except for the variables and functions to retrieve the variables. I've looked at boost preprocessor and it seems more designed to create classes that have a fixed number of variables but different defaults. Could any of the boost libraries turn the included class into boilerplate code that allows an arbitrary number of variables? The example below only has three variables but I could have used any number. Ryan //Minimal detail. Not complete class struct Arguments { Arguments(void) { xxx = false; yyy = 3; zzz = 4530; } bool operator== (Arugments const& rhs) { return ( (xxx == rhs.xxx) && (yyy == rhs.yyy) && (zzz == rhs.zzz)); } bool getXXX(void) const { return xxx; } int getYYY(void) const { return yyy; } long getZZZ(void) const { return zzz; } bool xxx; int yyy; long zzz; }; //Would like to be able to call it instead something like this Create( Arguments, //Class name ((bool, xxx, getXXX, false), (int, yyy, getYYY, 3), (long, zzz, getZZZ, 4530)));

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How to disable the check or the error after checking for ICU (for regex lib) when building boost ?
by Timothy Madden 05 Sep '10

05 Sep '10

Hello I get the following message when compiling boost from trunk: 1>Building the Boost C++ Libraries. 1>has_icu_test.cpp 1>libs\regex\build\has_icu_test.cpp(12) : fatal error C1083: Cannot open include file: 'unicode/uversion.h': No such file or directory 1>Performing configuration checks 1> - has_icu builds : no Although the build succeeds (as this is a test) Visual Studio recognizes the error in the output and stops compiling the project and reports the build as failed. Is there a way for me to suppress this message ? Or this test ? Attempting to redirect output with &>outfile.txt do not work as the error messages still gets output in VS. Are there and build options to disable this check ? Thank you, Timothy Madden

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boost interprocess library and concurrency
by Shane Miller 04 Sep '10

04 Sep '10

Hi, After reading through the BOOST interprocess library documentation I cannot workout whether - its STL set/hash/vector containers are multi-threaded safe. (Seeming, no, is the answer) - if a program cores in the middle of write operation to a STL container in shared memory then clearly the container is in an undefined state. Locks might be left locked (if this BOOST library uses locks say in a STL set or hash map insert/update). Now what? We just throw away the shared memory segment and start again? Has anybody solved these issues using CAS, transactions, or some other lock free solution? - aside from these issues, suppose one allocates a 2GB shared memory segment and all 2GB is used by a STL set. Does this BOOST interprocess library support adding more shared memory segments so this STL set can grow larger? Does doing so require relocating it which is a slow operation? What are the details here. I am looking for a crash recoverable, concurrent shared memory implementation of STL. Mainly I have a cache of items that will be read-intensive with some periodic updates and insertions throughout the day. Key-value pairs won't work; it must operate on pointers to C++ structs. Shane

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