January 2006 - Boost-users - lists.preview.boost.org

Re: [Boost-users] Boost Math Library
by Sliwa, Przemyslaw (London) 11 Jan '06

11 Jan '06

Please have a look at GSL. It is a C lib but can be used with C++. Kind regards Pshemek Przemyslaw Sliwa Global Foreign Exchange FX Risk Engine Development Merrill Lynch ( +44 (0)20 7995 4182 ) +44 (0)79 6325 2319 * Email: przemyslaw_sliwa(a)ml.com -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of yinglcs2(a)yahoo.com Sent: 10 January 2006 07:29 To: boost-users(a)lists.boost.org Subject: [Boost-users] Boost Math Library Hi, Does Boost Math Library support Statistic Calculation? (e.g. median, std deviation, etc)? >From here, it does not appear Boost Math library calculate has statistic algorithm. If not, can someone please recommend some c/c++ library which does statistics? Thank you. http://www.boost.org/libs/libraries.htm#Algorithms Math and numerics * math - Several contributions in the domain of mathematics, from various authors. * numeric/conversion - Optimized Policy-based Numeric Conversions, from Fernando Cacciola. * integer - Headers to ease dealing with integral types. * interval - Extends the usual arithmetic functions to mathematical intervals, from Guillaume Melquiond, Hervé Brönnimann and Sylvain Pion. * math/common_factor - Greatest common divisor and least common multiple, from Daryle Walker. * math/octonion - Octonions, from Hubert Holin. * math/quaternion - Quaternions, from Hubert Holin. * math/special_functions - Mathematical special functions such as atanh, sinc, and sinhc, from Hubert Holin. * multi_array - Multidimensional containers and adaptors for arrays of contiguous data, from Ron Garcia. * operators - Templates ease arithmetic classes and iterators, from Dave Abrahams and Jeremy Siek. * random - A complete system for random number generation, from Jens Maurer. * rational - A rational number class, from Paul Moore. * uBLAS - Basic linear algebra for dense, packed and sparse matrices, from Joerg Walter and Mathias Koch. __________________________________________ Yahoo! DSL - Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -------------------------------------------------------- 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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[serialization] [wave] [spirit] Can't compile boost cvs
by Peter Whaite 10 Jan '06

10 Jan '06

Since before Christmas I haven't been able to compile the cvs serialization xml files. It looks like something in spirit. Wave also fails to compile with the same errors. I'm a bit surprised I haven't seen this mentioned on the boost lists, though I see there are many failures in the boost regression notifications. % gcc -v Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/specs Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --host=i386-redhat-linux Thread model: posix gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5) % bjam --with-serialization Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). ...found 4780 targets... ...updating 48 targets... gcc-C++-action bin/boost/libs/serialization/build/libboost_serialization.a/gcc/debug/xml_grammar.o In file included from /misc/hdb1/local-src/boost_cvs/boost/spirit/core/scanner/skipper.hpp:16, from /misc/hdb1/local-src/boost_cvs/boost/spirit/core/composite/impl/directives.ipp:16, from /misc/hdb1/local-src/boost_cvs/boost/spirit/core/primitives/primitives.hpp:16, from /misc/hdb1/local-src/boost_cvs/boost/spirit/utility/chset.hpp:15, from /misc/hdb1/local-src/boost_cvs/boost/archive/impl/basic_xml_grammar.hpp:69, from /misc/hdb1/local-src/boost_cvs/libs/serialization/src/xml_grammar.cpp:16: /misc/hdb1/local-src/boost_cvs/boost/spirit/core/primitives/impl/primitives.ipp:190: new declaration `template<class CharT> boost::enable_if<boost::spirit::impl::use_char_traits<CharT>, std::char_traits<_CharT>::int_type>::type boost::spirit::impl::to_int_type(CharT)' /misc/hdb1/local-src/boost_cvs/boost/spirit/core/primitives/impl/primitives.ipp:171: ambiguates old declaration `template<class CharT> boost::disable_if<boost::spirit::impl::use_char_traits<CharT>, CharT>::type boost::spirit::impl::to_int_type(CharT)' /misc/hdb1/local-src/boost_cvs/boost/spirit/core/primitives/impl/primitives.ipp:199: new declaration `template<class CharT> boost::enable_if<boost::spirit::impl::use_char_traits<CharT>, CharT>::type boost::spirit::impl::to_char_type(CharT)' /misc/hdb1/local-src/boost_cvs/boost/spirit/core/primitives/impl/primitives.ipp:179: ambiguates old declaration `template<class CharT> boost::disable_if<boost::spirit::impl::use_char_traits<CharT>, CharT>::type boost::spirit::impl::to_char_type(CharT)' set -e "g++" -c -DBOOST_LIB_DIAGNOSTIC=1 -g -O0 -fno-inline -Wall -ftemplate-depth-255 -Wno-non-virtual-dtor -Wno-ctor-dtor-privacy -I"bin/boost/libs/serial ization/build" -I "/misc/hdb1/local-src/boost_cvs" -o "bin/boost/libs/serialization/build/libboost_serialization.a/gcc/debug/xml_grammar.o" "/misc/hdb1/lo cal-src/boost_cvs/libs/serialization/build/../src/xml_grammar.cpp" "/usr/bin/objcopy" --set-section-flags .debug_str=contents,debug "bin/boost/libs/serialization/build/libboost_serialization.a/gcc/debug/xml_grammar.o" ...failed gcc-C++-action bin/boost/libs/serialization/build/libboost_serialization.a/gcc/debug/xml_grammar.o... gcc-C++-action bin/boost/libs/serialization/build/libboost_serialization.a/gcc/debug/xml_iarchive.o ...interrupted ...failed updating 1 target... -- Peter Whaite (http://whaite.ca)

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[serialization] : Documentation
by nitin motgi 10 Jan '06

10 Jan '06

Hi, I think a sentence has to be modified in the documentation. On the link http://www.boost.org/libs/serialization/doc/index.html Section : Pending Issues [ Added >> << ] currently can't serialize through a pointer an object >>a of<< class that implements its own new/delete operators. I was wondering whether it is "object a". to currently can't serialize through a pointer an object >>of a<< class that implements its own new/delete operators. Thank you, -- Nitin Motgi NITIN . DOT. MOTGI .AT. GMAIL .DOT. COM

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Re: [Boost-users] [BULK] Re: [Test] Running a specific Test Suite
by Sohail Somani 10 Jan '06

10 Jan '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Gennadiy Rozental > Sent: Tuesday, January 10, 2006 11:03 AM > To: boost-users(a)lists.boost.org > Subject: [BULK] Re: [Boost-users] [Test] Running a specific Test Suite > Importance: Low > > > > Is there a flag I can pass to the test program or any other > way to run > > only a specific Test Suite, ignoring the other ones? > > Hopefully by the end of this release cycle I will add an > ability to run tests by name, which should satisfy this request. I am not yet a user of boost unit test, but is there a way of listing all the tests/targets as well? That could be very useful. I still wish this was a feature in scons!

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iterators 2
by jens-theisen＠gmx.de 10 Jan '06

10 Jan '06

Hello, Thanks for the references, I briefly looked at them (Views and any_iterator) and wasn't aware of them beforehand. I'm not really looking for a solution to a particular problem I might have, but rather wondering if there is not something very basic missing from C++. In many other programming languages there is a good notion for talking about a collection of things conveniently. Python and the .NET languages have this with their iterator concepts. C++ only has it's iterators currently, which is not always a very good solution for reasons alread said. Especially, for the starting problem of my original posting, there is no natural solution. True, there is any_iterator: We can define the virtual function in my original problem as typedef boost::iterator_range< adobe::any_iterator< ... > > ret_range; class X : ... { virtual ret_range give_stuff() const; ... It's still a monstrosity, however, given that any_iterator has 4 template parameters, is derived from iterator_facade, and the iterator_range doubles this even. Presumably, a library author would quickly write his own little nonstandard iterator interface himself and have the virtual function return this instead. It would be nice to have something lightweight enough to promote its use a bit like boost::shared_ptr has become "the obvious way" of dealing with dynamic objects in C++. What I like to have is something more lightweight, along the following requirements: - the "notion" of a collection of things as a concrete type rather than a concept - fast to compile, simple error messages, fun to use, it should be the obvious choice for a library programmer to give collections of things (rather than awkward input iterators derived from iterator_facade) - a toolbox of free functions to combine them in all the ways I can do with linked lists in functional languages - performance and memory usage don't have to be optimal if we're just talking about the cost of a virtualisation A while ago, I made a first attempt on this, making the following design decisions: - There is no concept, but just one templated type: class list< typename reference >; which has various implementations and is, despite the name, conceptually a forward traversal iterator which is aware of the end of its range. - lists are constructed by using a number of free functions only, notably - the make_list overload set, implementing construction from stuff like iterators, containers, etc. and - map, filter, concat, etc. for combining lists in useful ways. - lists have conversion operators along the line of the conversion of their underlying reference type, which especially enables list< T const& > to be used where list< T > is expected. - lists are not iterators, but they can export that behaviour. If this feature isn't used, iterator_facade don't have to be present. (If viewed as iterators, their end is a default constructed list, as usual.) The most important thing that's lacking, however, is that lists are conceptually forward traversal only. Actually, I'm not entirely convinced that it would really be necessary to have more than that (or less). My impression is that virtualisation for more than forward traversal is less dearly needed. I can only think of somewhat contrived examples. What do you think? If other forms of traversal are important, this would complexify all of this quite a bit. Presumably there would be a class hierarchy reflecting the traversal concepts, and possibly each such hiearchy for the implementations as well. But what should free function like map return then? There would have to be overloads for each of the traversal types, and there are already other reasons for overloads. How do people think on this matter? What direction to go? Is this worth spending time on? Cheers, Jens

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[Test] Running a specific Test Suite
by Edson Tadeu 10 Jan '06

10 Jan '06

Is there a flag I can pass to the test program or any other way to run only a specific Test Suite, ignoring the other ones? Thanks in advance

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Boost Serialization: extended_type_info_no_rtti not working...
by RIVASSEAU Jean Noel 10 Jan '06

10 Jan '06

Hello, I am trying to learn the Boost Serialization Library. Although I like the fundamental principles of the library, using the library so far has proven a nightmare for my project. To be more precise: I need to serialize objects via pointers to base class. And I need to do it without RTTI. While using extended_type_info_no_rtti for my classes I always get an "unregistered_class" exception at run time. But I have done the following: in all my classes, in the implementation unit (.cpp) I have included explicitely the headers needed for the archives I use: #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> Then I have something like that in each class: #include <boost/serialization/base_object.hpp> #include <boost/serialization/type_info_implementation.hpp> #include <boost/serialization/extended_type_info_no_rtti.hpp> #include <boost/serialization/export.hpp> namespace boost { namespace serialization { template<class Archive> void serialize(Archive & ar, PrimitiveMemberVariableSpecification & m, const unsigned int version) { ar & boost::serialization::base_object<MemberVariableSpecification>(m); ar & m.unused_primitive_type; } } // namespace serialization } // namespace boost BOOST_CLASS_TYPE_INFO( PrimitiveMemberVariableSpecification, extended_type_info_no_rtti<PrimitiveMemberVariableSpecification> ) BOOST_CLASS_EXPORT(PrimitiveMemberVariableSpecification) (Here the name of the class is PrimitiveMemberVariableSpecification. I also want to report a bug in the documentation: the doc says that you should write: BOOST_CLASS_TYPE_INFO( ClassName, extended_type_info_no_rtti<BaseClassName> ) Although the example test_no_rtti.cpp uses the following syntax: BOOST_CLASS_TYPE_INFO( ClassName, extended_type_info_no_rtti<ClassName> ) I think that the example is right, not the documentation. ) Normally the BOOST_CLASS_EXPORT should *register* all my classes. Why doesn't it work? I have of course also written a correct get_key() virtual function for all my classes. If I just change extended_type_info_no_rtti to extended_type_info_typeid, everything works fine, but I do want extended_type_info_no_rtti. Also, keeping everything in the headers files seems to be a nightmare, although that is what Robert Ramsey recommends. I get tons of multiple definitions errors at link time if I do that (something like: multiple definition of `boost::archive::detail::guid_initializer<MemberVariableSpecification>::instance' with gcc - MinGW 3.4.2) I have looked at the documentation for two days, read absolutely everything and still do not understand. Maybe I should look at the code ??? Thank you Jean-Noël

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Cross compiling boost libraries with gcc and using boost jam to crosscompile third-party library (Jambase problem)
by Vladimir Michl 10 Jan '06

10 Jan '06

Hi all in this list, recently I was put into task to cross compile boost for ARM platform with GCC. My building platform is i386 Linux with gcc and cross compiling to arm Linux. Standard way for this kind of compilation is, that name of cross compiler (running under i386 but producing arm code) and all cross binary utilities are prefixed by target plarform, so like arm-linux-gcc, arm-linux-g++, arm-linux-ar, arm-linux-objcopy for arm-linux. And this is causing a bit of problem with boost. I can force GCC and GXX, but still have a problem with ar and objcopy. I've tried to setup GCC_BIN_DIRECTORY but it didn't work. So I've done a small patch to tools/build/v1/gcc-tools.jam adding GCC_PREFIX variable, that if set up, will prefix names of all tools with that prefix. So I can compile boost with bjam -sTOOLS=gcc -sGCC_PREFIX=arm-linux- stage May be it will be useful to add the same functionality to gcc-stlport-tools.jam or mingw. So please find attached changes. It is possible to include them into next boost release? By the way, the same problem appears when boost jam is used to compile some third-party libraries. Is this place good to talk about boost jam and its Jambase file? Vlad -- Vladimir Michl <vladimir.michl(a)seznam.cz>, ICQ# 312939054 Tel: +447793527010 +447906361574 +420608413590

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[bind] Problem with 1.33.1, g++ 3.3.3
by David Greene 10 Jan '06

10 Jan '06

I'm trying to compile this little program: #include <boost/bind.hpp> #include <iostream> namespace tester { class Test { public: void do_test(void) { std::cout << "Done!" << std::endl; }; }; }; int main(void) { tester::Test x; bind(&tester::Test::do_test, &x, _1)(); return(0); } But I end up with this error (full error trace below): /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind.hpp:63: error: ` void (tester::Test::*)()' is not a class, struct, or union type It looks like somewhere along the way the wrong template specialization is chosen for result type deduction. Am I doing something wrong or is this a known problem? I tried lambda's bind but that also gives an error. It's a different error but I believe it amounts to the same problem. Thanks! -Dave ------------------------ bind.cc:16: instantiated from here /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind.hpp:63: error: ` void (tester::Test::*)()' is not a class, struct, or union type /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind/bind_template.hpp: In instantiation of `boost::_bi::bind_t<boost::_bi::unspecified, void (tester::Test::*)(), boost::_bi::list2<boost::_bi::value<tester::Test*>, boost::arg<1> > >': /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind.hpp:1409: instantiated from `boost::_bi::bind_t<boost::_bi::unspecified, F, typename boost::_bi::list_av_2<A1, A2>::type> boost::bind(F, A1, A2) [with F = void (tester::Test::*)(), A1 = tester::Test*, A2 = boost::arg<1>]' bind.cc:16: instantiated from here /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind/bind_template.hpp:15: error: no type named `type' in `struct boost::_bi::result_traits<boost::_bi::unspecified, void (tester::Test::*)()> ' /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind/bind_template.hpp:18: error: no type named `type' in `struct boost::_bi::result_traits<boost::_bi::unspecified, void (tester::Test::*)()> ' /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind/bind_template.hpp:24: error: no type named `type' in `struct boost::_bi::result_traits<boost::_bi::unspecified, void (tester::Test::*)()> ' /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind/bind_template.hpp:30: error: no type named `type' in `struct boost::_bi::result_traits<boost::_bi::unspecified, void (tester::Test::*)()> ' /tools/i686-pc-linux-gnu/include/boost-1_33_1/boost/bind/bind_template.hpp:30: confused by earlier errors, bailing out make: *** [bind.o] Error 1 Compilation exited abnormally with code 2 at Mon Jan 9 17:08:20

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accessing boost::format's parsing results?
by nospam＠technolumiere.com 10 Jan '06

10 Jan '06

Does anyone know if it is possible to have boost::format parse a printf style format string, and have the results accessible? i.e. given a string like "filename_v%02d.%s", I'd like to be able to parse it and see that there are two arguments, and then retrieve their type. It seems that all the parsing in boost::format is hidden away internally. It would be a shame to have to write my own printf format string parser when I know there is a good one already in there somewhere. AC.

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Profiling Boost Graph Library with gprof
by Dave 10 Jan '06

10 Jan '06

Hello All, I have been trying to profile a few graph algorithms written using Boost Graph Library. I am using gprof for profiling. My graph has 100 vertices. It takes more than 10 minutes to compile, I suspect it is because of the size of the graph. The profile does not show any details though. It only shows the amount of time spent by the profiler. What am I doing wrong? Any help is greatly appreciated! Thanks. __________________________________________ Yahoo! DSL Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com

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Understanding Boost.Mpl Fold Algorithm
by Eduardo Bezerra 10 Jan '06

10 Jan '06

Hi, I'm having a hard time trying to understand what the placeholders _1 and _2 mean in the context of the mpl::fold algorithm. >From the Boost.Mpl Reference manual: typedef vector<long,float,short,double,float,long,long double> types; typedef fold< types , int_<0> , if_< is_float<_2>,next<_1>,_1 > >::type number_of_floats; BOOST_MPL_ASSERT_RELATION( number_of_floats::value, ==, 4 ); Could someone give me some help on this ? Best regards, Eduardo

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Is there a StringBuffer equivalent in Boost library?
by ying lcs 10 Jan '06

10 Jan '06

Is there a StringBuffer equivalent in Boost library? If not, what is the most efficient way to append string? Thank you. __________________________________________ Yahoo! DSL Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com

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Bind signals together
by Will 10 Jan '06

10 Jan '06

Hi, I'm looking for a general technique for binding signals with varying signatures together. Obviously i can create custom functions for any specific case, but i'm wondering if boost::bind could be used to help out here? i.e. boost::signal1<void, const char *> sig1; boost::signal0<void> sig2; void bing() { std::cout << "bing" << std::endl; } // connect sig1 to sig2 such that calling sig1 will invoke sig2 // ... <- how do i do this? // connect sig2 to some function sig2.connect(&bing); // call the signal sig1("some string"); Thanks in advance - Will

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any Boost library for unit testing C++ code
by ying lcs 09 Jan '06

09 Jan '06

Hi, Is there any Boost library for unit testing C++ code? If not, can anyone please recommend any good library for unit testing C+++ code? Thank you. __________________________________________ Yahoo! DSL Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com

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boost::thread problem on 1.33.1
by Brian Plummer 09 Jan '06

09 Jan '06

The following simple program seg faults. (I have boiled it down to the bare essentials to product the fault: ================================================================== #include <boost/thread.hpp> void * MMULT2(void); void * MMULT2CalcMaster(void); int main(void) { MMULT2(); } class MMULT2ThreadClass { void calculate(void) {} public : MMULT2ThreadClass() {} void operator ()() { calculate(); } }; void * MMULT2CalcMaster(void) { int numThreads = 2; boost::thread_group threads; for (int i = 0; i < numThreads; ++i) threads.create_thread(MMULT2ThreadClass()); threads.join_all(); } void * MMULT2(void) { return MMULT2CalcMaster(); } ================================================================== Here is the compile line: cd /SDE/common/src/lib/PSF/PSFWorkbook/testing/BoostThreadProblem/ make clean run DEBUG=YES /bin/rm -rf DO/LINUX_X86_GCC3.4.5/debug/BoostThreadProblem.o /SDE/common/bin/LINUX_X86_GCC3.4.5/debug/BoostThreadProblem *.o *.i Templates.DB gcc -I. -I/SDE/common/include -I/usr/java/jdk1.3.1_01/include -I/usr/java/jdk1.3.1_01/include/linux -I/opt/sybase-11.9.2/include -c -g -DDEBUG -D_TRACE -DLITTLEENDIAN=1 -DDBG=1 -DDEVL=1 -DDBGPROP -D_UNIX -DNEWPROPS -DBRP_LINUXINTEL -DBRP_LITTLE_ENDIAN BoostThreadProblem.cpp -o DO/LINUX_X86_GCC3.4.5/debug/BoostThreadProblem.o gcc DO/LINUX_X86_GCC3.4.5/debug/BoostThreadProblem.o -L/usr/local/lib -L/usr/lib -L/SDE/COTS/Boost/boost_1_33_1/bin/boost/libs/thread/build/libboost_thread.a/gcc/release/threading-multi -lboost_thread-gcc-mt-d-1_33_1 -o /SDE/common/bin/LINUX_X86_GCC3.4.5/debug/BoostThreadProblem /SDE/common/bin/LINUX_X86_GCC3.4.5/debug/BoostThreadProblem make: *** [run] Segmentation fault Compilation exited abnormally with code 2 at Wed Jan 4 17:12:11 ================================================================== I have tried using the -pthread and -D_REENTRANT compile flags with no luck. I had previously used the code that this example is based on, without any problems under 1.30.0 (and not using the -pthread and -D_REENTRANT flags). I feel I've got to be missing something very basic associated with building and using the Thread library. At this point I'm a bit stumped. Also, I noticed the following. bjam -sTOOLS=gcc in the build directory only builds the mt_d version of the library and not the release version. I don't remember needing to do anything special to get both versions built. Additionally, I'm not having any of these problems with the same code on WIN32 with Visual Studio 2003. Thanks in advance, Brian

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[Parameter] Documentation opinions
by Thomas Matelich 09 Jan '06

09 Jan '06

Parameter seems perfect for some code I'm writing now, so I thought I'd give it a look. The organization of the documentation is definitely not oriented to the type of library user I am (skim tutorial, quick copy/paste of example, then hack with reference docs). I have two requests that would have given me less headaches. 1) Provide complete source for the examples at 3 phases. Say a .cpp covering the topics learned so far at the end of each 2.x section. Going and looking at the test code, I did find tutorial, though I was disappointed to find it had only the first minimal example, and the other test code is built around smaller/simpler problems 2) Move the reference doc link to the top. I totally missed it until I hit Konqueror's Up navigation button and saw the rst in http://www.boost.org/libs/parameter/doc/. Thanks for listening. Tom PS Please don't ask for patches, this is a suggestion, I don't care if you do it or not. I know Dave's a stickler for good docs, so I'm giving some feedback.

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user defined seed
by Giulio Veronesi 09 Jan '06

09 Jan '06

Hi all, I've a problem with random number generator. Let us consider the following code fragment: long int s = 123456; mt19937 rnd_gen(s); When I try to compile it I get the following error message: /home/mpalesi/WORK/TOOLS/BGL/current/boost/random/mersenne_twister.hpp: In member function `void boost::random::mersenne_twister<UIntType, w, n, m, r, a, u, s, b, t, c, l, val>::seed(Generator&) [with Generator = long int, UIntType = uint32_t, int w = 32, int n = 624, int m = 397, int r = 31, UIntType a = 09908b0df, int u = 11, int s = 7, UIntType b = 09d2c5680, int t = 15, UIntType c = 0efc60000, int l = 18, UIntType val = 0c77666de]': /home/mpalesi/WORK/TOOLS/BGL/current/boost/random/mersenne_twister.hpp:67: instantiated from `boost::random::mersenne_twister<UIntType, w, n, m, r, a, u, s, b, t, c, l, val>::mersenne_twister(Generator&) [with Generator = long int, UIntType = uint32_t, int w = 32, int n = 624, int m = 397, int r = 31, UIntType a = 09908b0df, int u = 11, int s = 7, UIntType b = 09d2c5680, int t = 15, UIntType c = 0efc60000, int l = 18, UIntType val = 0c77666de]' src/apsra_mesh.cpp:253: instantiated from here /home/mpalesi/WORK/TOOLS/BGL/current/boost/random/mersenne_twister.hpp:103: error: ` gen' cannot be used as a function make: *** [obj/apsra_mesh.o] Error 1 The src/apsra_mesh.cpp:253 is the row "mt19937 rnd_gen(s);" I've no problem if I try to compile: mt19937 rnd_gen(123456); Please, could you help me to resolve this problem? Best regards, Giulio Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com

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Field of record as boost::any
by Mateusz Łoskot 09 Jan '06

09 Jan '06

Hi, Is boost::any suitable to use it as a type of field of record? Record is a set of fields. Every field may store value of different type: int, double, char*. Usually, in this case I'd use union of int,double and char*. But I'd like to solve it a better way, more C++ than C. So, would you recommend boost::any as a type of field value? Cheers -- Mateusz Łoskot http://mateusz.loskot.net

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Is boost::filesystem::path unable to deal with hidden unix dircetories?
by Hendrik Belitz 09 Jan '06

09 Jan '06

Dear boost users and developers, I just encountered a minor problem in boost::filesystem::path which seems to be unable to deal with hidden unix directories ( == names preceeded by an dot '.' character ). Is there any way to generate a valid path object for paths like "/foo/.bar"? Trying to create such an object from a C++ string results in an exception getting thrown. ------------------------------------------------------------------------------------- Dipl.-Inform. Hendrik Belitz Central Institute of Electronics / Zentralinstitut für Elektronik Multimodal image processing workgroup / AG Multimodale Bildverarbeitung Research Center Juelich / Forschungszentrum Jülich GmbH D-52428 Jülich, Germany Tel.: (++49)2461 61 8701 Fax: (++49)2461 61 3990 email: h.belitz(a)fz-juelich.de ggp-key available via http://pgpkeys.pca.dfn.de

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[MSVC7.0] functions missing when BOOST_NO_MEMBER_TEMPLATES is defined
by Allen Zhao 09 Jan '06

09 Jan '06

Hi, All, As I am working to get libtorrent working on Win32 with MSVC 7.0, I notice that BOOST_NO_MEMBER_TEMPLATES is defined by default. As a consquence, some of the functions in multi_index_container.cpp is not defined. For example, #if !defined(BOOST_NO_MEMBER_TEMPLATES) template<int N> struct nth_index { BOOST_STATIC_ASSERT(N>=0&&N<mpl::size<index_type_list>::type::value); typedef typename mpl::at_c<index_type_list,N>::type type; }; template<int N> typename nth_index<N>::type& get(BOOST_EXPLICIT_TEMPLATE_NON_TYPE(int,N)) { BOOST_STATIC_ASSERT(N>=0&&N<mpl::size<index_type_list>::type::value); return *this; } template<int N> const typename nth_index<N>::type& get( BOOST_EXPLICIT_TEMPLATE_NON_TYPE(int,N))const { BOOST_STATIC_ASSERT(N>=0&&N<mpl::size<index_type_list>::type::value); return *this; } #endif Is there anything to enable these functions when BOOST_NO_MEMBER_TEMPLATES is undef? Any suggestions? Best regards, Allen Zhao

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Misuse of shared_ptr?
by Pooyan McSporran 09 Jan '06

09 Jan '06

Hi, (Using gcc 4.0.2, boost 1.33.1, linux) I've got a program which causes segfaults using shared_ptr. I've reduced the program as far as I can to show the fault without any extra fluff. It looks as if an object pointed to by a shared_ptr is being deleted more than once. What I'm trying to do is to have an instance of Memory 'know' about an instance of Foo. This is currently being done with a shared_ptr. It appears that I'm misusing shared_ptr in the assignment, but I'm unsure as to what the right way is. Alternatively, I probably could use a reference instead of a shared_ptr, but I'm not sure if the Foo instance will always exist. Thanks in anticipation. #include <cstdlib> #include <iostream> #include <string> #include <boost/shared_ptr.hpp> class Memory; typedef boost::shared_ptr<Memory> MemoryPtr; class Foo; typedef boost::shared_ptr<Foo> FooPtr; class Memory { public: Memory () : fp () { std::cout << "Constructed Memory" << std::endl; }; virtual ~Memory () { std::cout << "Destructing Memory" << std::endl; std::cout << "fp.use_count=" << fp.use_count () << std::endl; }; void remember1 (FooPtr f) { std::cout << "Remembering" << std::endl; fp = f; }; private: FooPtr fp; }; class Foo { public: Foo (const std::string& name_) : name (name_) { std::cout << "Constructed Foo '" << name << "'" << std::endl; }; virtual ~Foo () { std::cout << "Destructing Foo '" << name << "'" << std::endl; }; void test (MemoryPtr m) { m -> remember1 (FooPtr (this)); } private: const std::string name; }; int main () { { FooPtr f1 (new Foo ("first")); MemoryPtr m1 (new Memory ()); f1 -> test (m1); } return EXIT_SUCCESS; }

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[program_options] How to use unknown program options?
by Vsevolod Vlaskin 09 Jan '06

09 Jan '06

Hi, I am trying to allow unknown options in the command line of my application (as described in "Allowing Unknown Options" section of program_options docs). Here is the code snippet: //----------------------------------------------------- boost::program_options::options_description my_options("Options"); my_options.add_options() /* adding some allowed options */ ; boost::program_options::variables_map vm; boost::program_options::store( boost::program_options::command_line_parser( ac, av ).options( my_options ).allow_unregistered().run(), vm ); boost::program_options::notify( vm ); //----------------------------------------------------- If an option is not specified in my_options, the call boost::program_options::store() above throws exception "unknown option". (I checked that it is store() that throws.) Does anyone have any suggestions how I could store and access the option values in this case? Of course, I can use basic_parsed_options returned by run(), but it seems to defeat the convenience of the library. Is there any way to use store() and variables_map in this case? Thank you for help. Best regards, Vsevolod Vlaskine __________________________________________ Yahoo! DSL Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com

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Mutually exclusive options in boost::program_options?
by Marshall Clow 09 Jan '06

09 Jan '06

I'm trying to use boost::program_options for the first time, and there's a couple things that I am tripping over. The first is the idea of mutually exclusive options. I can't find any support for them in the library, and that surprises me - to the point of asking for help. I have two options, only one of which can be specified; say -frtti and -fno_rtti (say). The other one is that program_options, by default, wants to use double hyphens to define options: "foo --option1 --option2" I'm a lot more comfortable with single hyphens: "foo -option1 -option2" Am I missing something basic here? -- -- Marshall Marshall Clow Idio Software <mailto:marshall@idio.com> It is by caffeine alone I set my mind in motion. It is by the beans of Java that thoughts acquire speed, the hands acquire shaking, the shaking becomes a warning. It is by caffeine alone I set my mind in motion.

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Error when including date_time files
by Rob Marsden 09 Jan '06

09 Jan '06

I am having trouble with some date_time files. The following code (from the boost documentation): #include "boost/date_time/posix_time/posix_time.hpp" #include "boost/date_time/local_time_adjustor.hpp" #include "boost/date_time/c_local_time_adjustor.hpp" #include <iostream> int main() { return(0); } gives me errors C:\LOCAL\INCLUDE/boost/date_time/posix_time/time_formatters_limited.hpp(77): error: more than one operator "<<" matches these operands: function "std::basic_ostream<_E, _Tr>::operator<<(std::_Bool={bool={bool}}) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(short) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(unsigned short) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(int) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(unsigned int) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(long) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(unsigned long) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(float) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(double) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(long double) [with _E=char, _Tr=std::char_traits<char>]" operand types are: std::basic_ostream<char, std::char_traits<char>> << boost::posix_time::time_duration::fractional_seconds_type << frac_sec; ^ C:\LOCAL\INCLUDE/boost/date_time/posix_time/time_formatters_limited.hpp(140): error: more than one operator "<<" matches these operands: ...similar ^ C:\LOCAL\INCLUDE/boost/lexical_cast.hpp(156): error: no operator ">>" matches these operands operand types are: std::basic_stringstream<char, std::char_traits<char>, std::allocator<char>> >> boost::int64_t stream >> output && ^ detected during: instantiation of "bool={bool} boost::detail::lexical_stream<Target, Source>::operator>>(InputStreamable &) [with Target=boost::int64_t={__int64}, Source=boost::detail::array_to_pointer_decay<std::basic_string<char, std::char_traits<char> , std::allocator<char>>>::type, InputStreamable=boost::int64_t={__int64}]" at line 221 instantiation of "Target boost::lexical_cast<Target,Source>(const Source &) [with Target=boost::int64_t={__int64}, Source=std::basic_string<char, std::char_traits<char>, std::allocator<char>>::_Myt]" at line 94 of "C:\LOCAL\INCLUDE/boost /date_time/time_parsing.hpp" instantiation of "time_duration boost::date_time::parse_delimited_time_duration<time_duration>(const std::string &) [with time_duration=boost::posix_time::time_duration]" compilation aborted for C:\Research\DogWood\TextAnalysis\Parser\BoostTest\BoostTest.cpp (code 2) Error executing xicl6.exe. The environment is compiler Intel v9.0 in the VC6 IDE under Win2k Can anyone suggest a solution? -- Rob Marsden Gistix (Northern) Limited

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