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[date_time] dst_local_start_time
by Jean-Pierre Bergamin 06 Nov '08

06 Nov '08

Hello I'm confused about the returned time of the dst_local_start_time() function. First of all I don't understand why a ptime is returned and not a local_date_time, buy anyway. The ptime I get returned for the timezone Europe/Zurich for 2007 is: 2007-Mar-25 02:00:00 Assuming that this is a UTC time, the local time in Zurich would then be 2007-Mar-25 04:00:00 (because during summertime, Zurich is 2h ahead of UTC), but the correct local dst start time would be 2007-Mar-25 03:00:00 (because the clocks are shifted from 2 to 3). To correctly calculate the dst start time, I have to add the dst_offset to the returned time_of_day. The returned ptime 2007-Mar-25 02:00:00 seems to be the endtime of wintertime as a local time. time_zone_ptr zh_tz = tz_db.time_zone_from_region("Europe/Zurich"); ptime zh_dst_start_time = zh_tz->dst_local_start_time(2007); std::cout << zh_dst_start_time << std::endl; // 2007-Mar-25 02:00:00 local_date_time zh_dst_local_start_time = local_date_time(zh_dst_start_time, zh_tz); std::cout << zh_dst_local_start_time << std::endl; // 2007-Mar-25 04:00:00 CEST which is wrong! ptime zh_dst_start_time_ok = zh_dst_start_time + zh_tz->dst_offset(); local_date_time zh_dst_local_start_time_ok = local_date_time(zh_dst_start_time_ok.date(), zh_dst_start_time_ok.time_of_day(), zh_tz, true); std::cout << zh_dst_local_start_time_ok << std::endl; // 2007-Mar-25 03:00:00 CEST which is correct So what time exactly is local_start_time() returning? Is this a bug or am I missing something? Regards James

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[Lambda] Using placeholders as array indices
by user790 user790 06 Nov '08

06 Nov '08

I am trying to use boost::lambda's placeholders as array indices. What I tried boils down to this: <code> #include <vector> #include <boost/lambda/bind.hpp> #include <boost/lambda/lambda.hpp> int main(int argc, char * argv[]) { using namespace boost::lambda; std::vector<int> a(10,0); bind(static_cast<std::vector<int>::reference (std::vector<int>::*)(std::vector<int>::size_type)>(&std::vector<int>::operator[]), a, _1)(0) = 1; } </code> But I get the following error (Visual C++ 2008 Express Edition, boost 1.35.0): error C2665: 'boost::lambda::function_adaptor<Func>::apply' : none of the 2 overloads could convert all the argument types What part am I missing? Thanks, P.

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Assertion 'px != 0' failed when using boost::regex
by Daniel Hansen 06 Nov '08

06 Nov '08

Hey everyone, I'm in desperate need of some help here. I'm working on a webcrawler for a computer science class and I'm using boost::regex to parse some of the html elements. After calling a few boost::regex functions, I get this error. It doesn't seem to be tied to any specific funcion, but it seeems to come up after a certain number of calls to the functions. Here is the exact error: test: /usr/include/boost/shared_ptr.hpp:315: T* boost::shared_ptr<T>::operator->() const [with T = boost::regex_token_iterator_implementation<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >]: Assertion `px != 0' failed. and the backtrace: #0 0x00110416 in __kernel_vsyscall () #1 0x005424c0 in raise () from /lib/libc.so.6 #2 0x00543e88 in abort () from /lib/libc.so.6 #3 0x0053b3fe in __assert_fail () from /lib/libc.so.6 #4 0x0806228f in boost::shared_ptr<boost::regex_token_iterator_implementation<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > >::operator-> (this=0xbfffef04) at /usr/include/boost/shared_ptr.hpp:315 #5 0x080622a7 in boost::regex_token_iterator<__gnu_cxx::__normal_iterator<char const*, std::string>, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::operator* (this=0xbfffef04) at /usr/include/boost/regex/v4/regex_token_iterator.hpp:243 #6 0x080582cd in HTMLParser::parse I have attached my code, so that you can see what functions I'm using and in what context, etc. I really appreciate all your help. Thanks, Daniel Hansen

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Boost::Serialize, serializing std::basic_string
by Jacob Holm 06 Nov '08

06 Nov '08

I have a variable which is a basic_string, as I want my own allocator assigned to it. This gives me the following compiler error: "Error 3 error C2039: 'serialize' : is not a member of 'std::basic_string<_Elem,_Traits,_Ax>' ...\boost\serialization\access.hpp 109" I have searched around for this error but have not been able to find a solution. It would be possible to just pass a vector with chars in it, but basic_string is preferred. Has anyone else had this problem and maybe managed to solve it? /Jacob Holm

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subject:[Thread] undefined reference to `boost::thread::thread......
by xiaofeng liao 06 Nov '08

06 Nov '08

Hello ,every one. I got undefefined reference errors while using thread libs, I reviewd some existing post on this subject, but still can't solve my problem. So I paste my problem here, I appreciate any help. Thank you. My platform is fedora 8, gcc 4.1.2 20070925 (Red Hat 4.1.2-33). I downloaded boost_1_37_0.tar.bz2 from www.boost.org I followed the "Getting started guide" on the www.boost.org I extracted the boost_1_37_0.tar.bz2 use "tar --bzip2 -xf /usr/local/boost_1_37_0.tar.bz2"; Because I want to write multi-thread programs using boost, so I decided to build the separately-compiled Boost libraries. I followed the "Getting Started Guide". I run the following cmds: ./configure --prefix=/usr/local/boost_1_37_0/ make install So, after long wait, it's done, all the librarys are build. My /usr/local/boost_1_37_0 directory structure looks like this: ----------------------------------------------------------------------------------- drwxr-xr-x 3 root root 4096 11-03 16:51 bin.v2 drwxr-xr-x 69 1000 1000 4096 11-02 20:50 boost -rw-r--r-- 1 1000 1000 848 06-26 23:57 boost-build.jam -rw-r--r-- 1 1000 1000 969 2006-12-02 boost.css -rw-r--r-- 1 1000 1000 6308 2005-08-12 boost.png -rwxr-xr-x 1 1000 1000 9909 2008-04-30 configure -rw-r--r-- 1 root root 0 11-05 22:05 dir drwxr-xr-x 4 1000 1000 4096 11-02 21:05 doc drwxr-xr-x 3 root root 4096 11-03 16:51 include -rw-r--r-- 1 1000 1000 770 2008-02-22 index.htm -rw-r--r-- 1 1000 1000 5505 10-20 21:20 index.html -rw-r--r-- 1 1000 1000 291 2008-03-27 INSTALL -rw-r--r-- 1 1000 1000 16934 11-01 21:14 Jamroot drwxr-xr-x 2 root root 12288 11-03 17:14 lib drwxr-xr-x 80 1000 1000 4096 11-02 20:53 libs -rw-r--r-- 1 1000 1000 1338 2003-09-30 LICENSE_1_0.txt -rw-r--r-- 1 root root 1026 11-03 19:57 Makefile drwxr-xr-x 4 1000 1000 4096 11-02 20:53 more drwxr-xr-x 2 1000 1000 4096 11-02 20:49 people -rw-r--r-- 1 1000 1000 2610 2008-03-23 rst.css drwxr-xr-x 2 1000 1000 4096 11-02 20:49 status drwxr-xr-x 13 1000 1000 4096 11-02 20:53 tools -rw-r--r-- 1 root root 165 11-03 16:49 user-config.jam -rw-r--r-- 1 root root 113 11-03 16:47 user-config.jam.1 drwxr-xr-x 2 1000 1000 4096 11-02 20:53 wiki ---------------------------------------------------------------------------------- I test the regex library by running the program from the "Getting Started Guide", which links the regex library. I named the program regex.cpp. Following is the cmd I used to compile the program. "c++ -I /usr/local/boost_1_37_0 regex.cpp -o regex /usr/local/boost_1_37_0/lib/libboost_regex-gcc41-mt-1_37.a" There is no error occurs. Then, I write another program trying to use the thread library. I named this program thre.cpp. Following is my program, a very simple one: ----------------------------------------------------------------------------- #include <boost/thread.hpp> #include <iostream> void hello() { std::cout<<std::endl<<"hello world, I'm a thread!"<<std::endl; } int main() { boost::thread thrd(&hello); thrd.join(); return 0; } ------------------------------------------------------------------------------------ Then I compile it use the following cmd, very similar to the previous one " c++ -I /usr/local/boost_1_37_0 thre.cpp -o thre /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a" but I got the following errors: ------------------------------------------------------------------------------------- /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::set_current_thread_data(boost::detail::thread_data_base*)': thread.cpp:(.text+0x12a): undefined reference to `pthread_setspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::(anonymous namespace)::create_current_thread_tls_key()': thread.cpp:(.text+0x146): undefined reference to `pthread_key_create' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::get_current_thread_data()': thread.cpp:(.text+0x173): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::thread::start_thread()': thread.cpp:(.text+0x648): undefined reference to `pthread_create' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::thread::detach()': thread.cpp:(.text+0x79f): undefined reference to `pthread_detach' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `thread_proxy': thread.cpp:(.text+0x9ce): undefined reference to `pthread_setspecific' thread.cpp:(.text+0xa0d): undefined reference to `pthread_setspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::(anonymous namespace)::make_external_thread_data()': thread.cpp:(.text+0xe84): undefined reference to `pthread_setspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::find_tss_data(void const*)': thread.cpp:(.text+0x1427): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::this_thread::restore_interruption::~restore_interruption()': thread.cpp:(.text+0x1493): undefined reference to `pthread_getspecific' thread.cpp:(.text+0x14b8): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::this_thread::restore_interruption::~restore_interruption()': thread.cpp:(.text+0x14f3): undefined reference to `pthread_getspecific' thread.cpp:(.text+0x1518): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o):thread.cpp:(.text+0x155d): more undefined references to `pthread_getspecific' follow /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::thread::join()': thread.cpp:(.text+0x1be9): undefined reference to `pthread_join' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::set_tss_data(void const*, boost::shared_ptr<boost::detail::tss_cleanup_function>, void*, bool)': thread.cpp:(.text+0x1f5d): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::get_tss_data(void const*)': thread.cpp:(.text+0x2137): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::this_thread::disable_interruption::disable_interruption()': thread.cpp:(.text+0x2197): undefined reference to `pthread_getspecific' thread.cpp:(.text+0x21d1): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::this_thread::disable_interruption::disable_interruption()': thread.cpp:(.text+0x2217): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o):thread.cpp:(.text+0x2251): more undefined references to `pthread_getspecific' follow /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::thread::timed_join(boost::posix_time::ptime const&)': thread.cpp:(.text+0x237a): undefined reference to `pthread_join' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::condition_variable::timed_wait(boost::unique_lock<boost::mutex>&, boost::posix_time::ptime const&)': thread.cpp:(.text._ZN5boost18condition_variable10timed_waitERNS_11unique_lockINS_5mutexEEERKNS_10posix_time5ptimeE[boost::condition_variable::timed_wait(boost::unique_lock<boost::mutex>&, boost::posix_time::ptime const&)]+0x26): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(once.o): In function `boost::detail::get_once_per_thread_epoch()': once.cpp:(.text+0x17): undefined reference to `pthread_once' once.cpp:(.text+0x24): undefined reference to `pthread_getspecific' once.cpp:(.text+0x4d): undefined reference to `pthread_setspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(once.o): In function `create_epoch_tss_key': once.cpp:(.text+0x86): undefined reference to `pthread_key_create' collect2: ld 返回 1 ------------------------------------------------------------------------------------- But in fact ,in the lib directory , there exist the thread libs, they are: ------------------------------------------------------------------------------------- /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt.a /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt.so /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.so /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.so.1.37.0 ------------------------------------------------------------------------------------- I also tried another cmds on these two programs, they are: "g++ -o regex -lz regex.cpp /usr/local/boost_1_37_0/lib/libboost_regex-gcc41-mt-1_37.a" "g++ -o thre -lz thre.cpp /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a" the regex cmd runs ok, but the thre cmd again failed. Got the following errors: ------------------------------------------------------------------------------------ thre.cpp:(.text+0xad): undefined reference to `boost::thread::thread(boost::function0<void, std::allocator<boost::function_base> > const&)' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::set_current_thread_data(boost::detail::thread_data_base*)': thread.cpp:(.text+0x12a): undefined reference to `pthread_setspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::(anonymous namespace)::create_current_thread_tls_key()': thread.cpp:(.text+0x146): undefined reference to `pthread_key_create' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::get_current_thread_data()': thread.cpp:(.text+0x173): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::thread::start_thread()': thread.cpp:(.text+0x648): undefined reference to `pthread_create' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::thread::detach()': thread.cpp:(.text+0x79f): undefined reference to `pthread_detach' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `thread_proxy': thread.cpp:(.text+0x9ce): undefined reference to `pthread_setspecific' thread.cpp:(.text+0xa0d): undefined reference to `pthread_setspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::(anonymous namespace)::make_external_thread_data()': thread.cpp:(.text+0xe84): undefined reference to `pthread_setspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::find_tss_data(void const*)': thread.cpp:(.text+0x1427): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::this_thread::restore_interruption::~restore_interruption()': thread.cpp:(.text+0x1493): undefined reference to `pthread_getspecific' thread.cpp:(.text+0x14b8): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::this_thread::restore_interruption::~restore_interruption()': thread.cpp:(.text+0x14f3): undefined reference to `pthread_getspecific' thread.cpp:(.text+0x1518): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o):thread.cpp:(.text+0x155d): more undefined references to `pthread_getspecific' follow /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::thread::join()': thread.cpp:(.text+0x1be9): undefined reference to `pthread_join' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::set_tss_data(void const*, boost::shared_ptr<boost::detail::tss_cleanup_function>, void*, bool)': thread.cpp:(.text+0x1f5d): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::detail::get_tss_data(void const*)': thread.cpp:(.text+0x2137): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::this_thread::disable_interruption::disable_interruption()': thread.cpp:(.text+0x2197): undefined reference to `pthread_getspecific' thread.cpp:(.text+0x21d1): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::this_thread::disable_interruption::disable_interruption()': thread.cpp:(.text+0x2217): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o):thread.cpp:(.text+0x2251): more undefined references to `pthread_getspecific' follow /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::thread::timed_join(boost::posix_time::ptime const&)': thread.cpp:(.text+0x237a): undefined reference to `pthread_join' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(thread.o): In function `boost::condition_variable::timed_wait(boost::unique_lock<boost::mutex>&, boost::posix_time::ptime const&)': thread.cpp:(.text._ZN5boost18condition_variable10timed_waitERNS_11unique_lockINS_5mutexEEERKNS_10posix_time5ptimeE[boost::condition_variable::timed_wait(boost::unique_lock<boost::mutex>&, boost::posix_time::ptime const&)]+0x26): undefined reference to `pthread_getspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(once.o): In function `boost::detail::get_once_per_thread_epoch()': once.cpp:(.text+0x17): undefined reference to `pthread_once' once.cpp:(.text+0x24): undefined reference to `pthread_getspecific' once.cpp:(.text+0x4d): undefined reference to `pthread_setspecific' /usr/local/boost_1_37_0/lib/libboost_thread-gcc41-mt-1_37.a(once.o): In function `create_epoch_tss_key': once.cpp:(.text+0x86): undefined reference to `pthread_key_create' collect2: ld 返回 1 --------------------------------------------------------------------------------- I attatched my makefile, hope it give some cues. Thank you for your patience reading so long a post. -- Xiaofeng Liao

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Handling big decimals
by Hakan Calim 05 Nov '08

05 Nov '08

Hallo, does anybody now which libary from boost should I use to handle wirh big decimals like 122186880370525. I have an array with this decimals. I will use this array in a Rayleigh distribution. Which data type can I use? Regards Hakan

3 2

documenting metafunctions
by Noah Roberts 05 Nov '08

05 Nov '08

Looking for ideas for hacking of doxygen comments to make decent metafunction documentation. Anyone have some experience with this?

3 2

[math] typo
by Christian Henning 05 Nov '08

05 Nov '08

Hi there, on the page http://www.boost.org/doc/libs/1_37_0/libs/math/doc/sf_and_dist/html/math_to… Shouldn't be the string "boost::gamma_distribution<>" be "boost::math::gamma_distribution<>"? Christian

2 1

[math] gamma function
by Christian Henning 05 Nov '08

05 Nov '08

Hi there, quick question. I have a gamma function with a shape and scale. To calculate the CDF for a specific probability is easy. BUT, can I somehow do the inverse? I mean calculate the probability from a given CDF? Thanks, Christian

2 1

shared_ptr and Visual Studio 2008 Express SP1
by Sergey Sadovnikov 05 Nov '08

05 Nov '08

Hello All, During migrating my project under new development environment I face out following issue: ambiguous unqualified 'shared_ptr' name resolution. For example in .cpp files I using several usings such as: using namespace std; using namespace std::tr1; using namespace boost; In source code I have something like this: shared_ptr<SomeType> var = /*...*/; And for each such line I have an error: error C2872: 'shared_ptr' : ambiguous symbol could be 'c:\program files\microsoft visual studio 9.0\vc\include\memory(1392) : std::tr1::shared_ptr' or 'c:\program files\microsoft visual studio 9.0\vc\include\memory(1392) : std::tr1::shared_ptr' or 'p:\projects\common\boost_1.36.0\boost\shared_ptr.hpp(165) : boost::shared_ptr' What I have to do to avoid this errors for boost 1.36 except explicit share_ptr qualification? Explicit including of "boost/shared_ptr" or "memory" I already put into #ifdef/#endif braces. But this didn't help. -- Best Regards, Sergey mailto:flex_ferrum@artberg.ru

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