August 2005 - Boost-users - lists.boost.org

date_time io bug in 1.33?
by Serge Skorokhodov 05 Sep '05

05 Sep '05

Hi, The following code looks pretty suspicious to me: extern const wchar_t* pts; // pts = L"2004071" std::wistringstream wiss(pts); wtime_input_facet* wtif = new wtime_input_facet; wtif->set_iso_format(); wiss.imbue(std::locale(std::locale::classic(), wtif)); ptime pt; wiss >> pt; std::string dbgs = to_iso_string(pt); // dbgs == "20040711T000000" Seems to be a bug? TIA -- Serge

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Compilation problem with date_time and iostream gzip (and bzip2) filters
by tonton 04 Sep '05

04 Sep '05

This simple test fails to compile with gcc 4.0.1 (or 4.0.2, it's the debian unstable version) and boost 1.33.0 if the date_time include is uncommented. Is there any known incompatibility between the two libraries ? #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/filter/gzip.hpp> // #include <boost/date_time/local_time/local_time.hpp> int main() { boost::iostreams::filtering_istream in; in.push(boost::iostreams::gzip_compressor()); return 0; } The full error is attached /usr/include/boost/iostreams/filter/symmetric.hpp: In member function ‘std::streamsize boost::iostreams::symmetric_filter<SymmetricFilter, Alloc>::read(Source&, typename boost::iostreams::char_type_of<T>::type*, std::streamsize) [with Source = boost::iostreams::detail::linked_streambuf<char, std::char_traits<char> >, SymmetricFilter = boost::iostreams::detail::zlib_compressor_impl<std::allocator<char> >, Alloc = std::allocator<char>]’: /usr/include/boost/iostreams/filter/gzip.hpp:199: instantiated from ‘std::streamsize boost::iostreams::basic_gzip_compressor<Alloc>::read(Source&, char*, std::streamsize) [with Source = boost::iostreams::detail::linked_streambuf<char, std::char_traits<char> >, Alloc = std::allocator<char>]’ /usr/include/boost/iostreams/read.hpp:215: instantiated from ‘static std::streamsize boost::iostreams::detail::read_filter_impl<boost::iostreams::multichar_tag>::read(T&, Source&, typename boost::iostreams::char_type_of<T>::type*, std::streamsize) [with T = boost::iostreams::basic_gzip_compressor<std::allocator<char> >, Source = boost::iostreams::detail::linked_streambuf<char, std::char_traits<char> >]’ /usr/include/boost/iostreams/read.hpp:56: instantiated from ‘std::streamsize boost::iostreams::read(T&, Source&, typename boost::iostreams::char_type_of<T>::type*, std::streamsize) [with T = boost::iostreams::basic_gzip_compressor<std::allocator<char> >, Source = boost::iostreams::detail::linked_streambuf<char, std::char_traits<char> >]’ /usr/include/boost/iostreams/detail/adapter/concept_adapter.hpp:247: instantiated from ‘static std::streamsize boost::iostreams::detail::flt_wrapper_impl<boost::iostreams::input>::read(Filter&, Source*, typename boost::iostreams::char_type_of<T>::type*, std::streamsize) [with Filter = boost::iostreams::basic_gzip_compressor<std::allocator<char> >, Source = boost::iostreams::detail::linked_streambuf<char, std::char_traits<char> >]’ /usr/include/boost/iostreams/detail/adapter/concept_adapter.hpp:74: instantiated from ‘std::streamsize boost::iostreams::detail::concept_adapter<T>::read(typename boost::iostreams::char_type_of<T>::type*, std::streamsize, Source*) [with Source = boost::iostreams::detail::linked_streambuf<char, std::char_traits<char> >, T = boost::iostreams::basic_gzip_compressor<std::allocator<char> >]’ /usr/include/boost/iostreams/detail/streambuf/indirect_streambuf.hpp:250: instantiated from ‘typename boost::iostreams::detail::indirect_streambuf<T, Tr, Alloc, Mode>::int_type boost::iostreams::detail::indirect_streambuf<T, Tr, Alloc, Mode>::underflow() [with T = boost::iostreams::basic_gzip_compressor<std::allocator<char> >, Tr = std::char_traits<char>, Alloc = std::allocator<char>, Mode = boost::iostreams::input]’ test.cpp:10: instantiated from here /usr/include/boost/iostreams/filter/symmetric.hpp:112: error: ‘boost::iostreams::symmetric_filter<boost::iostreams::detail::zlib_compressor_impl<std::allocator<char> >, std::allocator<char> >::<anonymous enum>’ is/uses anonymous type /usr/include/boost/iostreams/filter/symmetric.hpp:112: error: trying to instantiate ‘template<class T> struct boost::is_integral’ /usr/include/boost/iostreams/filter/symmetric.hpp:124: error: ‘boost::iostreams::symmetric_filter<boost::iostreams::detail::zlib_compressor_impl<std::allocator<char> >, std::allocator<char> >::<anonymous enum>’ is/uses anonymous type /usr/include/boost/iostreams/filter/symmetric.hpp:124: error: trying to instantiate ‘template<class T> struct boost::is_integral’ /usr/include/boost/iostreams/filter/symmetric.hpp:131: error: ‘boost::iostreams::symmetric_filter<boost::iostreams::detail::zlib_compressor_impl<std::allocator<char> >, std::allocator<char> >::<anonymous enum>’ is/uses anonymous type /usr/include/boost/iostreams/filter/symmetric.hpp:131: error: trying to instantiate ‘template<class T> struct boost::is_integral’

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Renaming boost libraries
by Matt 04 Sep '05

04 Sep '05

Heya Guys, Just wondering if it's possible to rename the boost libraries after they've been built. Specifically, I want to remove the boost version (-1_33) that is appended to all the lib and dll libraries. The reason is twofold; a) our source control system will mark the libs with a label to indicate the version and b) it should make migrating to a new boost version easier. I'm pretty sure it's fine to just physically rename the static libraries but seem to remember that for dynamic libs you can't do that because the matching .lib file indicates which .dll the application should load. Am I mistaken? If not is there any other way to specify that you don't want the boost version appended to the end of the filename? Cheers, Matt

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Regex compilation failure with MSVC .NET 2002 and bjam
by Ovanes Markarian 02 Sep '05

02 Sep '05

Dear all, I am trying to build the regex library from boost 1.33 release with Visual C++ .NET 2002 and bjam. I constantly get this error (while trying to build it with ICU and without). my command line is: bjam "--with-regex" "-sTOOLS=vc7" "--prefix=E:\projects\Automation\thirdparty\boost" "--builddir=E:\projects\Automation\thirdparty\boost\build" "-sHAVE_ICU=0" "-sICU_PATH=E:\projects\Automation\thirdparty\icu\source" install I was trying to switch -sHAVE_ICU option between 0 and 1 and always got this output for regex cpp files. The error(s) is in German (I don't know why MS decided to translate C++ compiler to German, but I have no other alternative at the moment and suffer very much with it as well...). The error means: cannot form a qualified name (=Ein qualifizierter Name kann nicht gebildet werden) see reference to class template instantiation boost::re_detail::regex_iterator_traits<T>' being compiled (=Siehe Verweis auf Instantiierung der kompilierten Klassenvorlage) Full output is: vc-C++ E:\projects\Automation\thirdparty\boost\build\bin\boost\libs\regex\build\ libboost_regex.lib\vc7\release\threading-multi\icu.obj cl : Befehlszeile warning D4029 : Die Optimierung ist im Standardcompiler nicht verf?gbar. icu.cpp E:\projects\Automation\thirdparty\boost_1_33_0\boost\regex\v4\iterator_traits.hp p(34) : error C2825: 'T::iterator_category': Ein qualifizierter Name kann nicht gebildet werden E:\projects\Automation\thirdparty\boost_1_33_0\boost\regex\v4\sub_match. hpp(31) : Siehe Verweis auf Instantiierung der kompilierten Klassenvorlage 'boos t::re_detail::regex_iterator_traits<T>' with [ T=const int * ] C:\Program Files\Microsoft Visual Studio .NET\Vc7\include\vector(259) : Siehe Verweis auf Instantiierung der kompilierten Klassenvorlage 'boost::sub_mat ch<BidiIterator>' with [ BidiIterator=const int * ] E:\projects\Automation\thirdparty\boost_1_33_0\boost\regex\v4\regex_form at.hpp(34) : Siehe Verweis auf Instantiierung der kompilierten Klassenvorlage 's td::vector<_Ty,_Ax>' with [ _Ty=boost::sub_match<const int *>, _Ax=std::allocator<boost::sub_match<const int *>> ] Does someone know what is the problem and how I can fix it? With Kind Regards, Ovanes Markarian

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Thread cancellation
by Sliwa, Przemyslaw (London) 01 Sep '05

01 Sep '05

Hi, Can anyone tell me if it is possible to cancel a thread using boost.thread library? Thanks Pshemek -------------------------------------------------------- If you are not an intended recipient of this e-mail, please notify the sender, delete it and do not read, act upon, print, disclose, copy, retain or redistribute it. Click here for important additional terms relating to this e-mail. http://www.ml.com/email_terms/ --------------------------------------------------------

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Re: [Boost-users] [statechart] Can events carry data?
by BRIDGES Dick 01 Sep '05

01 Sep '05

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Peter Petrov > Sent: Tuesday, August 30, 2005 1:13 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] [statechart] Can events carry data? > > > BRIDGES Dick wrote: > > Is there any provision for "event-local" storage? I'd like > to create > > events that carry data (e.g., timestamp, source, etc.) to be used by > > reactions and transitions to update state-local storage. > > > > I didn't see anything like this in the documentation. Bad > idea? Major > > drawbacks? If it wouldn't be a problem, how might I go > about doing it? > > > struct MyEvent : public boost::statechart::event<MyEvent> > { > int myData; > double myOtherData; > MyClass myOtherOtherData; > }; > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > Thank you for the example. I'm still not clear on the requirements surrounding such an instance. For example, the reference requires that <code>new E(*pCE)</code> be well-formed and make "a copy of pE". Does the current implementation work ok with boost::shared_ptr? How about auto_ptr? If a data member would normally require a deep copy, would I be better off managing it external to the event object - or avoiding that type of data altogether? How many copies are we talking about here? Any cautions and/or advise regarding the use of data members in events would be appreciated. Thanks again for the response. Regards, Dick Bridges

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Thread cancellation
by Chris Coleman 01 Sep '05

01 Sep '05

Hi, I know at present that the Boost Threads implementation does not provide a terminate() / cancel() function, but the documentation suggests that work is in progress to implement this feature once a safe and portable way is found. I was just wondering whether this will appear soon in future releases, or if it is likely to be some time? At present I can kill a thread internally by simply throwing an exception and not catching it. But externally I cannot. I have a thread pool server I built some time ago using the pthread API and I'm porting it to use Boost Threads. The server has add() and remove() thread methods. Within the remove function under the pthread implementation I could call pthread_cancel(thrID) and that would be that, Obviously I cant call thread.cancel() as I'd like here and was wondering if there were any simple ways to signify that a particular thread should terminate? Cheers Chris This message has been checked for viruses but the contents of an attachment may still contain software viruses, which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.

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Problem compiling boost::iostreams - bzlib.h file not found
by Tim Taylor 31 Aug '05

31 Aug '05

I have just downloaded boost 1.33.0 and am doing a bulk-standard install on my linux PC as per the instructions, with the command: bjam "-sTOOLS=gcc" install Nearly everything worked fine, but the iostreams library failed to compile, with the error in boost_1_33_0/libs/iostreams/src/bzip2.cpp: could not find include file "bzlib.h" On further investigation, this file comes from the package libbzip2_1-devel, which also needs to be installed. An extra thought: bzip2.cpp includes this file as #include "bzlib.h" but it should really be #include <bzlib.h> as this is from a different library. Tim

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boost::lambda::bind operator = std::vector sucess, bnu::vector and std::valarray fail
by pviallet＠yahoo.fr 31 Aug '05

31 Aug '05

I’m just starting to use boost::lambda an boost::lambda::bind, and I do not understand why this do not work whith bnuy::vector && std::valarray : class CToto{ public: CToto(double _i): a(_i) {} CToto(): a(0.0) {} double get() const {return a;} private: double a; }; std::vector<std::CToto *> aTotoPtrVect; aTotoPtrVect.push_back(new std::CToto(1.1)); aTotoPtrVect.push_back(new std::CToto(2.2)); aTotoPtrVect.push_back(new std::CToto(3.3)); aTotoPtrVect.push_back(new std::CToto(4.4)); //case 1 std::vector <double> dv(std::distance((aTotoVect.begin(), aTotoVect.end()); std::for_each(aTotoPtrVect.begin(), aTotoPtrVect.end(), bll::var(dv)[bll::var(uiIdx)++] = bll::bind(&CToto::get, bll::_1)); // work fine //case 2 double d(4) std::for_each(aTotoPtrVect.begin(), aTotoPtrVect.end(), bll::var(d)[bll::var(uiIdx)++] = bll::bind(&CToto::get, bll::_1)); // work fine //case 3 std::valaray <double> dvv(std::distance((aTotoVect.begin(), aTotoVect.end()); std::for_each(aTotoPtrVect.begin(), aTotoPtrVect.end(), bll::var(dvv)[bll::var(uiIdx)++] = bll::bind(&CToto::get, bll::_1)); // do not compile //case 4 bnu::vector<double> bvv(std::distance((aTotoVect.begin(), aTotoVect.end()); std::for_each(aTotoPtrVect.begin(), aTotoPtrVect.end(), bll::var(bvv)[bll::var(uiIdx)++] = bll::bind(&CToto::get, bll::_1)); // do not compile Is someone could explain me why it work in 1 and 2 ?

1 0

boost::date_time GMT/UTC question
by Leon Mergen 31 Aug '05

31 Aug '05

Hello, Simple/quick question: is boost::posix_time::ptime boost::posix_time::second_clock::universal_time(), which is described as UTC in the boost manual page, equal to GMT? If not, what is the difference between UTC and GMT? As I understood it, UTC is the "new" name for GMT, but I'm not sure. Regards, Leon

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