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Platform independent system time in milliseconds.
by Barry Andrews 23 Dec '06

23 Dec '06

Hi Boost Users, I am attempting to use the boost library date_time to create a platform independent function to get the system time in milliseconds. Basically, I need a millisecond precision timing mechanism. I read over the docs and looked at the examples from this library and came up with something that I thought would work, but it doesn't. :( ptime time_t_epoch(date(1970,1,1)); time_zone_ptr zone(new posix_time_zone("MST-07")); local_date_time dt_epoch(time_t_epoch, zone); time_zone_ptr zone2(new posix_time_zone("MST-07")); local_date_time ldt = local_microsec_clock::local_time(zone2); time_duration diff = ldt.utc_time() - dt_epoch.utc_time(); long milli = diff.total_milliseconds(); cout << milli << endl; What I get is a negative number. The function I want should have the exact same behavior as java.lang.System.currentTimeMillis() which returns "the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC." Is there a way to achieve this with boost? Is so, can someone please give me some hints as to how I can do this? many thanks for your help! -B

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fusion_2 won't compile one it's map examples with g++3.4.3
by David Minor 23 Dec '06

23 Dec '06

This example, from the docs, won't compile with linux g++3.4.3 typedef map< pair<int, char> , pair<double, std::string> > map_type; map_type m( make_pair<int>('X') , make_pair<double>("Men")); int main() { std::cout << at<int>(m) << std::endl; std::cout << at<double>(m) << std::endl; }

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shared_ptr and
by gast128 22 Dec '06

22 Dec '06

Dear all, I just typed something like this: void Foo(void (I::*pmf)()) { boost::shared_ptr<I> ptr(new I); (ptr->*pmf)(); } but this does not compile. Is there are rationale behind this? I have no experience in ovelroading operator->*, so maybe this question arises from ignorance. Wkr, me

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[date_time] timezone rules for different years
by Stephen Turner 22 Dec '06

22 Dec '06

For my application, I need to be able to get the local time of any UTC time in the last five years in any location. As far as I can see, the date_time library doesn't provide this. The documentation says that date_time_zonespec.csv is "based on data found in the zoneinfo datebase", but whereas the zoneinfo database contains historical information about daylight saving time changes, date_time_zonespec.csv only seems to allow you to specify a single rule for each timezone. And I can't find another mechanism to do it. Am I missing something, or is this capability not present? And if not, is there any plan to add it? Or a workaround? I anticipate that this will become more of a problem when the rules for the U.S. change by several weeks next year. Thanks in advance for any tips, and Happy Christmas, -- Stephen Turner, Cambridge, UK http://homepage.ntlworld.com/adelie/stephen/ "The internet is a reflection of our society. If we do not like what we see, the problem is not to fix the mirror, we have to fix society." (Vint Cerf)

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[program_options] crashes when calling po::store
by Jens Müller 21 Dec '06

21 Dec '06

[Note: I already posted this on -devel. The used CVS version of Boost is now about one week old.] I have the following program: #include <string> #include <iostream> #include <boost/program_options.hpp> namespace po = boost::program_options; int main(char argc,char** argv) { using std::string; // Kommandozeile parsen po::options_description desc("Allowed options"); desc.add_options() ("help,H", "print help message") ; po::variables_map vm; po::store(po::parse_command_line(argc, argv, desc), vm) ; po::notify(vm); if (vm.count("help")) { std::cout << desc << "\n"; return 1; } } Results when building with 1.33.1 headers and linking against 1.33.1 libs: $ cc -c -o separator2.o -g -Wall -Wno-deprecated -pipe -O -I. -I/home/jmueller/software/boost/include separator2.cpp $ cc -lboost_program_options-gcc-d -L/home/jmueller/software/boost/lib -o separator2 separator2.o $ ./separator2 $ ./separator2 --help Allowed options: -H [ --help ] print help message Results when building with CVS headers and linking against CVS libs: $ cc -c -o separator2.o -g -Wall -Wno-deprecated -pipe -O -I. -I/home/jmueller/software/boost-cvs/include separator2.cpp $ cc -lboost_program_options-gcc-d -L/home/jmueller/software/boost-cvs/lib -o separator2 separator2.o $ ./separator2 --help Segmentation fault My compiler: $ cc -v Using built-in specs. Target: i586-suse-linux Configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib --libexecdir=/usr/lib --enable-languages=c,c++,objc,fortran,java,ada --enable-checking=release --with-gxx-include-dir=/usr/include/c++/4.1.0 --enable-ssp --disable-libssp --enable-java-awt=gtk --enable-gtk-cairo --disable-libjava-multilib --with-slibdir=/lib --with-system-zlib --enable-shared --enable-__cxa_atexit --enable-libstdcxx-allocator=new --without-system-libunwind --with-cpu=generic --host=i586-suse-linux Thread model: posix gcc version 4.1.0 (SUSE Linux) Has anyone an idea what's going wrong here? If you need further info, please ask.

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compiling only regex library
by I.B. 21 Dec '06

21 Dec '06

Hi , i want to use boost regex++ for my project but dont want to compile all boost libraries for now, so i compiled using option: --with-regex got no errors, and result library: boost_regex-gcc-1_33_1.a copied all boost_<version>/boost headers to $HOME/include directory is like this: $HOME/include/boost/regex.hpp have a simple test.cpp file that uses: boost::regex_search(...) i compiled like this: g++ -o trun test.cpp -I/home/ig3/include -L/home/ig3/lib -lboost_regex-gcc-1_33_1 got following error: test.cpp: In function `int main(int, char**)': test.cpp:26: no matching function for call to `regex_search( __gnu_cxx::__normal_iterator<const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >&, __gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::cmatch&, boost::regex&)' i wonder why is that. Thought iterator is a template that shouldnt be compiled. Headers should be enough. I dont have problems compiling all boost libraries. I do understand c++ but libraries make my head heart yet. please, anyone, explain me ~igrek

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Linking to boost::iostreams, frustrated.
by Bo Peng 21 Dec '06

21 Dec '06

Dear all, I have tried several hours to link to a mingw built boost_iostreams under windows without success. Out of desperation, I turned to linux where I have a boost/cvs installed. Using a very simple test program: #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/filter/gzip.hpp> #include <boost/iostreams/device/file.hpp> namespace io = boost::iostreams; int main(int argc, char ** argv) { io::filtering_ostream ofs; ofs.push(io::gzip_compressor()); ofs.push(io::file_sink("test.txt")); ofs << "this is a test script\n"; return(0); } And > g++ -I/usr/include/boost-1_35 -lboost_iostreams-gcc34-d test.cpp would success and run fine, but > g++ -I/usr/include/boost-1_35 -static -lboost__iostreams-gcc34-d test.cpp will generate a bunch of undefined references like: /tmp/cc2T22tx.o(.text+0x1af): In function `main': : undefined reference to `boost::iostreams::zlib::default_strategy' /tmp/cc2T22tx.o(.text+0x1c0): In function `main': : undefined reference to `boost::iostreams::zlib::deflated' /tmp/cc2T22tx.o(.text+0x1c6): In function `main': : undefined reference to `boost::iostreams::zlib::default_compression' /tmp/cc2T22tx.o(.gnu.linkonce.t._ZN5boost9iostreams21basic_gzip_compressorISaIcEEC1ERKNS0_11gzip_paramsEi+0x1e8): In function `boost::iostreams::basic_gzip_compressor<std::allocator<char> >::basic_gzip_compressor(boost::iostreams::gzip_params const&, int)': Can anyone guess what is going on? Bo

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Boost.Python tutorial: not exporting inithello w/ MinGW
by Maximilian Wilson 21 Dec '06

21 Dec '06

[Re-send] I have an issue which seems to have come up earlier this year, and I was wondering if it had been resolved: http://groups.google.com/group/boost-list/browse_frm/thread/53bbf2a4e0e94e6… This is the same as my problem except I haven't verified with a manual build. When I build the tutorial example, hello.pyd doesn't appear to contain an inithello method: C:\Temp\shedskin-0.0.15>python Python 2.4.3 - Enthought Edition 1.0.0 (#69, Aug 2 2006, 12:09:59) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import hello Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: dynamic module does not define init function (inithello) >>> I built the .dll and .pyd straight from the unmodified Boost.Python tutorial files, using MinGW g++ 3.4.5 and Python 2.4. Is there something I'm leaving out, or is this a bug in MinGW and/or bjam? Thanks, Max -- Be pretty if you are, be witty if you can, But be cheerful if it kills you. Everything in Windows is very simple, but the simplest thing is difficult. -Clausewitz -- Be pretty if you are, be witty if you can, But be cheerful if it kills you. Everything in Windows is very simple, but the simplest thing is difficult. -Clausewitz

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interprocess exception problem
by Sunil Chomal 21 Dec '06

21 Dec '06

Dear All, I am trying to use the new "interprocess" library in Boost. I am working on a fedora core 5 machine. If I try to execute the first two sample codes given in the documents I get the following error: ********************** terminate called after throwing an instance of 'boost::interprocess::interprocess_exception' what(): Aborted ********************* Can someone help me sort this error. Regards, Sunil Chomal

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boost::regex segmentation fault
by Pete Cilliers 21 Dec '06

21 Dec '06

Hi I am running boost 1.31.1 on Fedora Core 6 with gcc 4.1.1 I get the following error when using boost::regex: Program received signal SIGSEGV, Segmentation fault. 0x0015efaf in boost::object_cache<boost::re_detail::cpp_regex_traits_base<char>, boost::re_detail::cpp_regex_traits_implementation<char> >::do_get () from /opt/viamedia/dependencies/lib/boost/libboost_regex-gcc-mt-1_33_1.so.1.33.1 Here is a copy of the backtrace: (gdb) bt #0 0x0015efaf in boost::object_cache<boost::re_detail::cpp_regex_traits_base<char>, boost::re_detail::cpp_regex_traits_implementation<char> >::do_get () from /opt/viamedia/dependencies/lib/boost/libboost_regex-gcc-mt-1_33_1.so.1.33.1 #1 0x0015fbd9 in boost::object_cache<boost::re_detail::cpp_regex_traits_base<char>, boost::re_detail::cpp_regex_traits_implementation<char> >::get () from /opt/viamedia/dependencies/lib/boost/libboost_regex-gcc-mt-1_33_1.so.1.33.1 #2 0x001767f7 in boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign () from /opt/viamedia/dependencies/lib/boost/libboost_regex-gcc-mt-1_33_1.so.1.33.1 #3 0x007a0e0a in boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign ( this=0xbfd3f030, p1=0x98bff24 "database#name\"vmcrm\"\\.(.*)", p2=0x98bff3e "", f=0) at /opt/viamedia/dependencies/include/boost/regex/v4/basic_regex.hpp:254 #4 0x007a0e4f in boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign ( this=0xbfd3f030, p=0x98bff24 "database#name\"vmcrm\"\\.(.*)", f=0) at /opt/viamedia/dependencies/include/boost/regex/v4/basic_regex.hpp:239 #5 0x007a0e98 in basic_regex (this=0xbfd3f030, p=0x98bff24 "database#name\"vmcrm\"\\.(.*)", f=0) at /opt/viamedia/dependencies/include/boost/regex/v4/basic_regex.hpp:208 Any help would be much appreciated! thanks

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