- Boost-users - lists.boost.org

[boostbook+quickbook] : A way to write latex math
by Bo Jensen 27 Oct '10

27 Oct '10

This is just some info, that might interest others : I just recently discovered : http://www.mathjax.org which is quite nice for writing math equations. I use quickbook for my documentation. Fortunately it is very easy to incorporate MathJax into quickbook, so you can write : ''' <my-latex-math>some formula in latex</my-latex-math> ''' I just added the following to the stylesheet : <xsl:template name="system.head.content"> <script type="text/javascript" src="somepath/MathJax/MathJax.js"></script> </xsl:template> <xsl:template match="my-latex-math"> <xsl:value-of select="."/> </xsl:template> I should say I am a totally newbie to xsl stylesheets, so I might be doing something bad, never the less it works fine :-)

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[math] round to fraction
by gast128 27 Oct '10

27 Oct '10

Hello all, I couldn't find a functionality like 'round to fraction', which would try round a floating point value to its nearby fraction portion: round2fraction(1.4, 0.5); -> 1.5 round2fraction(1.8, 0.5); -> 2.0 round2fraction(1.0, 0.5); -> 1.0 round2fraction(1.25, 0.5); -> 1.5 round2fraction(-1.6, 0.5); -> -1.5 We have here a private implementation, but this is probably not as optimised as those numerical guru's can come up with. Is this a good suggestion to add to Boost.Math or overkill?

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boost with Visual Studio 2005 (VC8) and 2010 (VC10)
by andrew.marlow＠uk.bnpparibas.com 27 Oct '10

27 Oct '10

I am using boost 1.42 and am considering moving to 1.44.0. I see from the release notes that 1.44.0 has improved support for VC10 especially with the TR1 parts. That's good because I would also like to move to VC10, I am currently on VC8 (i.e. 2005). Please don't laugh. The move to boost 1.44.0, if it happens, will most likely happen before the move to VC10. So does boost 1.44.0 work with VC8? It is not in the supported compilers list. Regards, Andrew Marlow ___________________________________________________________ This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited. Please refer to http://www.bnpparibas.co.uk/en/information/legal_information.asp?Code=ECAS-… for additional disclosures.

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getting started tutorial: link your program to a boost library
by Oliver Adams 27 Oct '10

27 Oct '10

Hi, I've just installed boost and have been going through the getting started guide (for unix variants). I am having problems with the section that discusses how to link your program to a boost library, using boost.regex as an example. $ c++ -I path/to/boost_1_44_0 example.cpp -o example \ ~/boost/stage/lib/libboost_regex-gcc34-mt-d-1_36.a That file does not exist. In fact there is no boost directory in my home directory. I'm not sure if running ./bjam install worked. It did build for a while, but the last few lines of output were: ...failed updating 60 targets... ...skipped 12 targets... ...updated 8866 targets... there seem to be a bunch of object files in /usr/local/boost_1_44_0/bin.v2/libs/regex/build/gcc-4.4.5/release/threading-multi unfortunately, when I try and use those files I end up getting: collect2: ld returned 1 exit status Any help's appreciated, Oliver

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[variant] assignment with possible casting
by Brian Budge 26 Oct '10

26 Oct '10

Hi all - I have a struct which holds parameter name/value pairs. The incoming data is not always exactly the same, as it's read from different sources, so sometimes I might have a parameter named "scale" which is a uint8_t, and other times "scale" is a uint32_t or int32_t. When I try to get() the data, I grab it as uint32_t, but it may be stored in the variant as an int32_t. We're using get<uint32_t> in that case, and this fails if the variant holds int32_t. On the other hand, since the variant can contain vector and matrix values, we can't simply use operator = for automatic casting (compile time errors). We don't expect to do any non-trivial casts (i.e. matrix to float or vice-versa). Are there any helper visitors or anything in the boost::variant library to assist with this, or do we need to write our own visitor? Code below. Thanks, Brian struct ParameterDesc { typedef boost::variant<bool, int32_t, uint32_t, float, Vec2f, Vec3f, Vec4f, Mat2f, Mat3f, Mat4f, std::string> ParamValue; typedef google::dense_hash_map<std::string, ParamValue> ParamMap; typedef ParamMap::iterator ParamMapIter; typedef ParamMap::const_iterator ParamMapCIter; std::string type; std::string name; ParamMap params; template <typename T> bool get(const std::string &name, T &val, const T &defaultValue) const { ParamMapCIter p_it; if( (p_it = params.find(name)) == params.end() ) { val = defaultValue; return false; } val = boost::get<T>(p_it->second); return true; } template <typename T> void get(const std::string &name, T &val) const { ParamMapCIter p_it; if( (p_it = params.find(name)) == params.end() ) { throw ParamException("couldn't find parameter with field name: " + name); } val = boost::get<T>(p_it->second); } ParameterDesc() { params.set_empty_key("__EMPTY__"); } };

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[asio] Error running as Windows service; runs fine from console
by Evan Burkitt 26 Oct '10

26 Oct '10

I have a Windows application that uses ASIO to implement a server that listens on a TCP port. When I run it from the console it starts and operates without error. When I start the same application as a Windows service (it's written to be run either way) my call to boost::asio::ip::tcp::acceptor::async_accept() immediately calls the passed accept handler to report error 995: "The I/O operation has been aborted because of either a thread exit or an application request". This occurs even when I run the service under the same account as the logged-in user. I know I'm a bit sketchy with the details of my implementation, but I think this is at least as likely to be some Windows weirdness as an ASIO problem per se. I'm hoping someone else has encountered and fixed this problem before. Thanks. -evan

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Re: [Boost-users] General design question about threading/concurrency
by Julien Martin 26 Oct '10

26 Oct '10

Hello Steve, Thanks for your post. Can you please tell me where to look for information about TBB tuning in the documentation? Julien. 2010/10/25 McKay, Steve F. <Steve.F.McKay(a)ssa.gov> > We have used Intel TBB in a situation similar to yours. We simulate the > U.S. population on 0.1 percent basis (about 300,000 people). We had > attempted to use raw threads before the TBB package became available, but it > was just too hard. The TBB package more or less automatically figures out > how many threads to use, creates the threads, and doles the work out to the > threads, using parallel_for. The biggest hurdle for us was learning how to > create function objects, since that is what parallel_for is set up to use. > But once you get the hang of it, writing your code that way actually helps > you write good code. You may have to do some things differently, or break > things down into smaller steps. > > > > Once you start using TBB, you will find other parts of it that are also > useful, such as parallel_reduce. Also note that, even though TBB is mostly > automatic, you should do some tuning because TBB may not have set the block > size well (how many people, or whatever you are simulating, it allocates to > a thread at one time). It may appear that TBB is not helping to reduce run > time, until you do some tuning. Read the tutorial. > > > > Steve McKay > > Steve.F.McKay(a)ssa.gov > > Social Security Administration > > Baltimore, Maryland 21235 > > > > *From:* boost-users-bounces(a)lists.boost.org [mailto: > boost-users-bounces(a)lists.boost.org] *On Behalf Of *Julien Martin > *Sent:* Monday, October 25, 2010 10:25 AM > *To:* boost-users(a)lists.boost.org > *Subject:* Re: [Boost-users] General design question about > threading/concurrency > > > > Ok. I will try that! > Thank you, > J. > > 2010/10/25 gast128 <gast128(a)hotmail.com> > > Julien Martin <balteo <at> gmail.com> writes: > > > Thanks gast128,I just installed TBB. Can you please tell me what to look > for > (which class, method or concept) in TBB? It is pretty vast...J. > > > 2010/10/25 gast128 <gast128 <at> hotmail.com>If u stay on the same > computer > > (i.e. plain x86 PC with multi cores or multi > > processors), I would recommend Intel's TBB, which splits up tasks > > automatically and tries to keep the processor busy. > > It would be nice if Boost / std C++ would have such a parallellism > library > > because it is an addition to using threads. > > Hello, > > tbb::parallel_for is probably where u will be interested in if the > individual > tasks are truely independent. > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > >

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General design question about threading/concurrency
by Julien Martin 26 Oct '10

26 Oct '10

Hello, I am writing a program that needs to run N simulations with N >10 000. Obviously, I cannot instantiate N threads at the same time but I cannot run the simulations sequentially either. Can anyone please advise me how to design my program using the boost threading library and concepts please? Thanks in advance, Julien.

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[OT] Permuting graphs
by Cedric Laczny 26 Oct '10

26 Oct '10

Hi, of course, this general topic is off-topic as it is not directly relatod to the Boost Graph Library. And I want to apologize for that in the first place. However, I think that many using the BGL may also have to deal sometimes with such problems. Therefore, I am addressing this question here and hope to find some answers ;) The question is about permuting a graph in order to assess the statistical significance of a certain aspect of the original graph. Sometimes, it is enough to randomly re-wire the existing edges, but other times, more elaborate techniques are necessary. Do you have some literature or references addressing this fact? I am especially interested in topology-conserving permutations (of tripartite graphs). Thank you. Best reagards, Cedric Laczny

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Boost 1.44 compilation on AIX
by jessica.alfonsi＠unipd.it 25 Oct '10

25 Oct '10

Hello, I'm trying to compile without results the Boost 1.44 package embedded with the ALPS libraries (http://alps.comp-phys.org/mediawiki/index.php/Main_Page) on AIX version 6.1, Visual Age C++ compiler 10.1. Soon after launching, compilation stops with the following error messages: subprogram boost::date_time::gregorian_calendar_base<boost::date_time::year_month_day_base<boost::gregorian::greg_year,boost::gregorian::greg_month,boost::gregorian::greg_day>,unsigned int>::end_of_month_day(year_type, month_type) could not be inlined into boost::gregorian::date::date(year_type, month_type, day_type). 1500-029: (W) WARNING: subprogram std::basic_string<char,std::char_traits<char>,std::allocator<char> >::_Assign<std::_Ptrit<char,long,const char *,const char &,char *,char &> >(_Ptrit<char,long,const char *,const char &,char *,char &>, _Ptrit<char,long,const char *,const char &,char *,char &>, input_iterator_tag) could not be inlined into boost::char_separator<char,std::char_traits<char> >::operator() <std::_Ptrit<char,long,const char *,const char &,char *,char &>,std::basic_string<char,std::char_traits<char>,std::allocator<char> > >(_Ptrit<char,long,const char *,const char &,char *,char &> &, _Ptrit<char,long,const char *,const char &,char *,char &>, basic_string<char,std::char_traits<char>,std::allocator<char> > &). 1500-029: (W) WARNING: subprogram std::basic_string<char,std::char_traits<char>,std::allocator<char> >::_Assign<std::_Ptrit<char,long,const char *,const char &,char *,char &> >(_Ptrit<char,long,const char *,const char &,char *,char &>, _Ptrit<char,long,const char *,const char &,char *,char &>, input_iterator_tag) could not be inlined into boost::char_separator<char,std::char_traits<char> >::operator() <std::_Ptrit<char,long,const char *,const char &,char *,char &>,std::basic_string<char,std::char_traits<char>,std::allocator<char> > >(_Ptrit<char,long,const char *,const char &,char *,char &> &, _Ptrit<char,long,const char *,const char &,char *,char &>, basic_string<char,std::char_traits<char>,std::allocator<char> > &). 1500-029: (W) WARNING: subprogram std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >::_Assign<wchar_t *>(wchar_t *, wchar_t *, input_iterator_tag) could not be inlined into boost::detail::lexical_cast<std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >,const wchar_t *,0,wchar_t>(param_type, wchar_t *, size_t). 1500-029: (W) WARNING: subprogram std::basic_string<char,std::char_traits<char>,std::allocator<char> >::_Assign<char *>(char *, char *, input_iterator_tag) could not be inlined into boost::detail::lexical_cast<std::basic_string<char,std::char_traits<char>,std::allocator<char> >,const char *,0,char>(param_type, char *, size_t). 1500-029: (W) WARNING: subprogram boost::filesystem2::basic_directory_entry<boost::filesystem2::basic_path<std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >,boost::filesystem2::wpath_traits> >::replace_filename(const string_type &, file_status, file_status) could not be inlined into boost::filesystem2::basic_directory_iterator<boost::filesystem2::basic_path<std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >,boost::filesystem2::wpath_traits> >::increment(). 1500-029: (W) WARNING: subprogram boost::filesystem2::basic_directory_entry<boost::filesystem2::basic_path<std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >,boost::filesystem2::wpath_traits> >::assign(const path_type &, file_status, file_status) could not be inlined into boost::filesystem2::basic_directory_iterator<boost::filesystem2::basic_path<std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >,boost::filesystem2::wpath_traits> >::m_init(const basic_path<std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >,boost::filesystem2::wpath_traits> &). 1500-029: (W) WARNING: subprogram boost::filesystem2::basic_directory_entry<boost::filesystem2::basic_path<std::basic_string<char,std::char_traits<char>,std::allocator<char> >,boost::filesystem2::path_traits> >::replace_filename(const string_type &, file_status, file_status) could not be inlined into boost::filesystem2::basic_directory_iterator<boost::filesystem2::basic_path<std::basic_string<char,std::char_traits<char>,std::allocator<char> >,boost::filesystem2::path_traits> >::increment(). 1500-029: (W) WARNING: subprogram boost::filesystem2::basic_directory_entry<boost::filesystem2::basic_path<std::basic_string<char,std::char_traits<char>,std::allocator<char> >,boost::filesystem2::path_traits> >::assign(const path_type &, file_status, file_status) could not be inlined into boost::filesystem2::basic_directory_iterator<boost::filesystem2::basic_path<std::basic_string<char,std::char_traits<char>,std::allocator<char> >,boost::filesystem2::path_traits> >::m_init(const basic_path<std::basic_string<char,std::char_traits<char>,std::allocator<char> >,boost::filesystem2::path_traits> &). "/gpfs/scratch/userexternal/jalfonsi/alps-2.0.0b4-r4959-src-with-boost/boost/boost/filesystem/v3/path.hpp", line 476.7: 1540-0716 (S) The template argument "boost::iterator" does not match the template parameter "class Derived". make[2]: *** [src/boost/CMakeFiles/boost.dir/__/__/boost/libs/filesystem/v3/src/operations.cpp.o] Error 1 make[1]: *** [src/boost/CMakeFiles/boost.dir/all] Error 2 make: *** [all] Error 2 Can someone tell me please if the compiler version could be the issue ? I see on Boost main page that 1.44 has been tested with Visual Age 11.1. I didn't have such problem with Boost 1.43 . Best regards Jessica

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