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[program_options] linking error with example
by katharina 19 Jan '10

19 Jan '10

Hi, I have problems starting out with the program_options library. Looking at the tutorial, I wanted to try out the first example metioned, first.cpp (which is located in boost_1_41_0/libs/program_options/example). But there seems to be some linking error. I try to compile it by g++ -I ~boost_1_41_0 first.cpp -o first ~/boost_1_41_0/stage/lib/libboost_program_options.a But then I get a strange error: /tmp/ccDB6KSC.o: In function `boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::allocator<boost::function_base> >)': first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE12extra_parserENS_9function1ISt4pairISsSsERKSsSaINS_13function_baseEEEE[boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::allocator<boost::function_base> >)]+0x27): undefined reference to `boost::program_options::detail::cmdline::set_additional_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::allocator<boost::function_base> >)' collect2: ld returned 1 exit status What am I doing wrong? Thanks, Katharina

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[spirit] boost 1.33.1, HP-UX ia64 & gcc-3.4.6 - doesn't work with optimization (-O2)
by Frank Bergemann 19 Jan '10

19 Jan '10

Hi, some supplementary information: The problem happens also for gcc-3.4.6 - which is the final version of gcc-3.x.x series. If i compile for 32 bit there is even a coredump for execution: (gdb) r Starting program: /nfs/uh01/frank/TESTX/sample test is '<pDeleteHlrSubscriberIn class_id="0" tracking_level="0" version="0">' Program received signal SIGBUS, Bus error si_code: 1 - BUS_ADRALN - Invalid address alignment. Please refer to the following link that helps in handling unaligned data: http://docs.hp.com/en/7730/newhelp0610/pragmas.htm#pragma-pack-ex3. boost::spirit::grammar<basic_xml_grammar<char>,boost::spirit::parser_context<boost::spirit::nil_t> >::grammar (this=0x40025cf0) at sp_counted_base_gcc_ia64.hpp:38 38 "r"(pw)); I opened a bug for gcc: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42791 And i asked HP for confirmation. I'll keep you informed... best regards, Frank ___________________________________________________________ Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.! http://produkte.web.de/go/02/

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fusion struct adapt macro, construct the struct from a fusion vector
by Hicham Mouline 19 Jan '10

19 Jan '10

Hello, I have a struct params { ... }; and I have adapted it as a fusion sequence. However I can't construct a params from a boost::fusion::vector<> with the same types. const params p( v ); // v is a fusion::vector with the same type const params p = v; // both failed to compile Do I need to actually write a specific ctor for params? Will it change the result of the adapt macro? Can I iterate with an algorithm over the vector at runtime to assign to p from v? with fusion::for_each() I couldn't write the functor that would let me assign to p. Regards,

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[boost.asio] Flush serial port buffers?
by Pascal Kesseli 18 Jan '10

18 Jan '10

Hi everyone My program currently writes some characters to a device connected over the serial interface and subsequently changes the baud rate, followed by sending some more characters. The problem is that the first transfer does not seem to complete before the baud rate switch and thus is sent with the new baud rate, which is not supposed to happen. What I am looking for is something like a flush() before changing the baud rate. Using: boost::asio::write(*port, buffer(buf, size), transfer_all()); does not seem to work. Any suggestions? Thanks and best regards Pascal _________________________________________________________________ Personalisiere dein Messenger, inklusive persönliche Smileys ;-) Überrasche deine Freunde - wir zeigen dir wie's geht. http://rubrik.ch.msn.com/reportagen/personalisieren.aspx

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Boost MultiArray and Boost uBLAS - Designed to be used together?
by Bilokon, Paul 18 Jan '10

18 Jan '10

Hi all, Were Boost MultiArray and Boost uBLAS designed to be used together? I.e. can I apply linear algebra operations to Boost MultiArrays and get Boost MultiArrays back? If this is impossible / impractical / inefficient, what's the right approach (conversion?). I would be very keen to know your thoughts on this. Many thanks for your help. Best wishes, Paul Paul Bilokon, Vice President Citigroup | FX - Options Trading | Quants 33 Canada Square | Canary Wharf | Floor 3 London, E14 5LB Phone: +44 20 798-62191 paul.bilokon(a)citi.com<mailto:paul.bilokon@citi.com>

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[spirit] boost 1.33.1, HP-UX ia64 & gcc-3.4.4 - doesn't work with optimization (-O2)
by Frank Bergemann 18 Jan '10

18 Jan '10

Hello, i posted a problem against boost::serialization. (http://article.gmane.org/gmane.comp.lib.boost.user/54935) But now i could track it down to boost::spirit. I have extracted boost::serialization stuff , which is dealing with boost spirit, in a mini demo program (see attached tar file). It accepts XML input if compiled with -O0 or -O1 and returns: |hpux03 407> make sample /usr/local/gcc-3.4.4/bin/g++ -g -mlp64 -Wall -mtune=itanium2 -O1 -I/nfs/uh01/frank/userspace/OPSC_DIAXHBS_dev_R2.2_hpport/include -c sample.cc /usr/local/gcc-3.4.4/bin/g++ -g -mlp64 -Wall -mtune=itanium2 -O1 -I/nfs/uh01/frank/userspace/OPSC_DIAXHBS_dev_R2.2_hpport/include -c fbe_basic_xml_grammar.cc ./sample /usr/local/gcc-3.4.4/bin/g++ -g -mlp64 -Wall -mtune=itanium2 -O1 -I/nfs/uh01/frank/userspace/OPSC_DIAXHBS_dev_R2.2_hpport/include -lunwind -o sample sample.o fbe_basic_xml_grammar.o |hpux03 408> ./sample test is '<pDeleteHlrSubscriberIn class_id="0" tracking_level="0" version="0">' parse_start_tag('<pDeleteHlrSubscriberIn class_id="0" tracking_level="0" version="0">') returned 1 But it fails, if i use -O2 or -O3: |hpux03 411> make sample /usr/local/gcc-3.4.4/bin/g++ -g -mlp64 -Wall -mtune=itanium2 -O2 -I/nfs/uh01/frank/userspace/OPSC_DIAXHBS_dev_R2.2_hpport/include -c sample.cc ./sample /usr/local/gcc-3.4.4/bin/g++ -g -mlp64 -Wall -mtune=itanium2 -O2 -I/nfs/uh01/frank/userspace/OPSC_DIAXHBS_dev_R2.2_hpport/include -c fbe_basic_xml_grammar.cc /usr/local/gcc-3.4.4/bin/g++ -g -mlp64 -Wall -mtune=itanium2 -O2 -I/nfs/uh01/frank/userspace/OPSC_DIAXHBS_dev_R2.2_hpport/include -lunwind -o sample sample.o fbe_basic_xml_grammar.o |hpux03 412> ./sample test is '<pDeleteHlrSubscriberIn class_id="0" tracking_level="0" version="0">' parse_start_tag('<pDeleteHlrSubscriberIn class_id="0" tracking_level="0" version="0">') returned 0 Is it a bug of gcc-3.4.4? (for HP-UX B11.31 ia64?) Or boost::spirit using experimental C++ feature (for level of gcc-3.4.4)? - many thanks! Frank Bergemann ______________________________________________________ GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! Jetzt freischalten unter http://movieflat.web.de

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[boost][interval containers (itl)] New library release on sourceforge
by Joachim Faulhaber 18 Jan '10

18 Jan '10

Dear boost users, I have developed a library of interval containers called Interval Template Library (ITL). The library, initially developed in an software industrial context, was proposed at the boost developer's list in May 2008, refined according to boost standards, presented at boostcon09 and submitted for a formal review in September 2009. Hartmut Kaiser is now supporting the ITL as review manager. I have uploaded a new release of the core library of interval containers (itl), extensions (itl_xt) and a test tool (validate) for law based automated testings as itl_plus_3_2_1 at the itl's project site at sourceforge: http://sourceforge.net/projects/itl/ Interval_sets and interval_maps of the ITL proved to be very useful in many fields the most important of which is the date and time problem domain. * Interval_sets and interval_maps can be used like the sets or maps of elements. Yet they are much more space and time efficient when the elements occur in contiguous chunks. * Interval containers allow for intersection with interval_sets to work with segmentation. For instance you might want to intersect an interval container with a grid of months and then iterate over those months. * The ITL comes with a universal mechanism of aggregation, that allows to combine associated values in meaningful ways when intervals overlap on insertion. Aggregation results that are difficult to obtain by handwritten algorithms can be computed in an abstract and simple way. * itl::interval_bitset is a self compressing class to represent very large bitsets. It combines interval and bitset compression. * You can get an instant impression of the usefulness of interval containers by looking at the collection of examples: http://www.herold-faulhaber.de/boost_itl/doc/libs/itl/doc/html/boost_itl/ex… * To get an overview over the itl's api refer to http://www.herold-faulhaber.de/boost_itl/doc/libs/itl/doc/html/boost_itl/in… I hope you will find this useful. In case you do, I'd like to encourage you to send in your feed back and suggestions and to participate in the upcoming review on the boost developer's list. Best regards Joachim Faulhaber --------------------------------------------------------------------- Interval Template Library (ITL) | Boost.IntervalContainers --------------------------------------------------------------------- Availability: Project page at sourceforge: http://sourceforge.net/projects/itl/ Boost Vault: http://www.boostpro.com/vault/index.php?&direction=0&order=&directory=Conta… Boost Quickbook documentation (core library itl) http://www.herold-faulhaber.de/boost_itl/doc/libs/itl/doc/html/index.html Doxygen Documentation (extensions itl_xt, validate) http://www.herold-faulhaber.de/itl/index.html The name ITL is provisional and will probably be changed to Boost.IntervalContainers after the review.

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[math][special_functions] Why is cbrt(x) slower than pow(x, 1/3)?
by Tim Odenthal 18 Jan '10

18 Jan '10

Hi! For a (cell) simulation code I have to calculate lots of cubic roots in every timestep. So I tried to improve performance on my first guess, namely pow(x, 1/3) using boost::math::cbrt(). To my astonishment, this is much slower than the original code. I wrote a small test program to check this claim; compiling with g++ (Ubuntu 4.4.1-4ubuntu9) 4.4.1 (-O3) on a Intel Core i7 CPU I get the following timings (averaging the time over 10 trials): average time to compute 5000000 roots with pow(): 0.603 s. average time to compute 5000000 roots with boost::cbrt(): 1.087 s. average time to compute 5000000 roots with improved boost::cbrt(): 1.015 s. average time to compute 5000000 roots with exp(1/3*log()): 0.541 s. My "improved" version allows giving the boost::math::cbrt() method a first guess instead of taking just the value of the number whose root is to be calculated. Actually, the function I called in this instance 5000000 times does a bit more than just calculating the root; I want to calculate the radii of to spheres which overlap so, that their combined volume is equal to the volume of a "mother sphere": /** * @brief calculates the radius of a daughter cell during symmetric division, * assuming the volume of the mother cell is conserved. * * @param MotherRadius radius of mother cell before division * @param Overlap of the two daughter cells, i.e. radius of daughter - * distance from center of daughter to middle-plane of * both cells * * @return for positive overlap returns positive radius, for negative overlap * negative radius **/ double daughterRadiusfOver( double MotherRadius, double Overlap) { // r = 1/2 (2 sqrt(R^6-h^3 R^3)-h^3+2 R^3)^(1/3)+h^2/(2 (2 sqrt(R^6-h^3 R^3)- h^3+2 R^3)^(1/3)) double O3 = Overlap*Overlap*Overlap; double M3 = MotherRadius*MotherRadius*MotherRadius; double step1 = pow(-O3 + 2*sqrt(-O3*M3 + M3*M3) + 2*M3,1.0/3.0);//<-- CUBIC ROOT HERE!!! Change to: // double step1 = boost::math::cbrt(-O3 + 2*sqrt(-O3*M3 + M3*M3) + 2*M3); if ( Overlap < 0 ){ cerr << "Warning in daughterRadiusfOver: Negative overlap given!" <<endl; return -(step1 + Overlap*Overlap/step1)*0.5; } else { return (step1 + Overlap*Overlap/step1)*0.5; } } Why is boost::math::cbrt() no improvement for me - or am I using it the wrong way? For which cases might it be an improvement, or why is it in the library? It's funny, but I found that std::exp(1/3*std::log(x)) is so far the fastest way... Thanks in advance Tim

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boost::format warning
by Henning Meyer 16 Jan '10

16 Jan '10

Hello, when compiling a simple test like this: #include <boost/format.hpp> int main(void) { int c = 0; boost::format("%1% %2%") % (c==42) % c++; } with this command: $ c++ -c -O -Wall -o ftest.o ftest.cc I get this warning: ftest.cc: In function ‘int main()’: ftest.cc:4: warning: operation on ‘c’ may be undefined What did I do wrong? Thanks for the help! Henning $ c++ -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.1-4ubuntu8' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i486 --with-tune=generic --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu8) $ uname -a Linux treponema 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 16:20:31 UTC 2009 i686 GNU/Linux

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[filesystem] boost 1.41, hpux, gcc 440, compilation error solved
by Rui Pedro Fernandes 15 Jan '10

15 Jan '10

Hi, While trying to compile filesystem under HPUX because the WCHAR_MAX define value used was including a ')' character (because the value has a cast). The include file wchar.h defines the correct WCHAR_MAX if macro _INCLUDE_STDC__SOURCE_199901 is defined. I then solved the problem by changing the filesystem's Jamfile.v2 to add the lines: : requirements <host-os>hpux,<toolset>gcc:<define>_INCLUDE_STDC__SOURCE_199901 Don't know however if this is the best way to solve the issue... Thanks, Rui

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