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BGL compared to LEDA
by xiao-hui.wu＠exxonmobil.com 24 Apr '06

24 Apr '06

Has anyone compared the performance of Boost Graph Library with LEDA? The following is a link I received that contains some comparisons. I would like to know your experience since I am trying to decide which one is more appropriate for my problems. http://www.quappa.com/leda-outperforms-boost.htm I like the generic interface of BGL, although LEDA has a C# counterpart called GOAL, which uses C# interfaces. I am not sure if the performance of GOAL matches LEDA, but it seems to provide some customization capability. Thanks in advance for your feedbacks and suggestions. Xiao-Hui Wu

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Lambda expressions and VC++6
by Sliwa, Przemyslaw (London) 24 Apr '06

24 Apr '06

Hi, I just wanted to know if Lambda expressions are supported by VC++6.0 SP5 compiler. Thanks for help, Pshemek 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 -------------------------------------------------------- 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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Boost regexp (Perl) throws initialization error for [^\0x21-\0xfe]
by Brad Barber 24 Apr '06

24 Apr '06

If my code contains the following regexp, const boost::tregex non_printables(__T("[^\0x21-\0x7E]+")); The program throws the following dialog box on initialization. The stack trace follows. Please forward to someone who cares :-) The following regexp, works as expected const boost::tregex non_printables(__T("[^!-~]+")); --Brad ntdll.dll!_KiFastSystemCallRet@0() ntdll.dll!_ZwWaitForMultipleObjects@20() + 0xc bytes kernel32.dll!_UnhandledExceptionFilter@4() + 0x84b bytes mscoree.dll!_abort() + 0xeb bytes mscoree.dll!terminate() + 0x2a bytes mscoree.dll!__CxxUnhandledExceptionFilter() + 0x39 bytes kernel32.dll!_UnhandledExceptionFilter@4() + 0x149 bytes > msvcr80d.dll!_XcptFilter(unsigned long xcptnum=3765269347, _EXCEPTION_POINTERS * pxcptinfoptrs=0x0007da0c) Line 237 + 0xa bytes C msvcr80d.dll!__CppXcptFilter(unsigned long xcptnum=3765269347, _EXCEPTION_POINTERS * pxcptinfoptrs=0x0007da0c) Line 147 + 0xd bytes C mathdlld.dll!__DllMainCRTStartup(void * hDllHandle=0x01010000, unsigned long dwReason=1, void * lpreserved=0x00000000) Line 517 + 0x17 bytes C msvcr80d.dll!@_EH4_CallFilterFunc@8() + 0x12 bytes Asm mathdlld.dll!_except_handler4(_EXCEPTION_RECORD * ExceptionRecord=0x0007db20, _EXCEPTION_REGISTRATION_RECORD * EstablisherFrame=0x0007e15c, _CONTEXT * ContextRecord=0x0007db40, void * DispatcherContext=0x0007daf4) + 0x22 bytes C ntdll.dll!ExecuteHandler2@20() + 0x26 bytes ntdll.dll!ExecuteHandler@20() + 0x24 bytes ntdll.dll!_KiUserExceptionDispatcher@8() + 0xe bytes kernel32.dll!_RaiseException@16() + 0x52 bytes msvcr80d.dll!_CxxThrowException(void * pExceptionObject=0x0007deb0, const _s__ThrowInfo * pThrowInfo=0x00b98b08) Line 166 C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::throw_exception<boost::regex_er ror>(const boost::regex_error & e={...}) Line 40 C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::regex_error::raise() Line 74 + 0x9 bytes C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::re_detail::basic_regex_parser<w char_t,boost::regex_traits<wchar_t,boost::w32_regex_traits<wchar_t> > >::fail(boost::regex_constants::error_type error_code=error_paren, int position=2) Line 161 C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::re_detail::basic_regex_parser<w char_t,boost::regex_traits<wchar_t,boost::w32_regex_traits<wchar_t> > >::parse(const wchar_t * p1=0x01735a34, const wchar_t * p2=0x01735a38, unsigned int flags=0) Line 137 C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::re_detail::basic_regex_implemen tation<wchar_t,boost::regex_traits<wchar_t,boost::w32_regex_traits<wchar _t> > >::assign(const wchar_t * arg_first=0x01735a34, const wchar_t * arg_last=0x01735a38, unsigned int f=0) Line 96 C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::basic_regex<wchar_t,boost::rege x_traits<wchar_t,boost::w32_regex_traits<wchar_t> > >::do_assign(const wchar_t * p1=0x01735a34, const wchar_t * p2=0x01735a38, unsigned int f=0) Line 524 C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::basic_regex<wchar_t,boost::rege x_traits<wchar_t,boost::w32_regex_traits<wchar_t> > >::assign(const wchar_t * p1=0x01735a34, const wchar_t * p2=0x01735a38, unsigned int f=0) Line 255 C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::basic_regex<wchar_t,boost::rege x_traits<wchar_t,boost::w32_regex_traits<wchar_t> > >::assign(const wchar_t * p=0x01735a34, unsigned int f=0) Line 240 C++ boost_regex-vc80-mt-gd-1_33_1.dll!boost::basic_regex<wchar_t,boost::rege x_traits<wchar_t,boost::w32_regex_traits<wchar_t> > >::basic_regex<wchar_t,boost::regex_traits<wchar_t,boost::w32_regex_trai ts<wchar_t> > >(const wchar_t * p=0x01735a34, unsigned int f=0) Line 209 C++ mathdlld.dll!`dynamic initializer for 'non_printables''() Line 65 + 0x15 bytes C++ msvcr80d.dll!_initterm(void (void)* * pfbegin=0x01701520, void (void)* * pfend=0x01702e5c) Line 855 C mathdlld.dll!_CRT_INIT(void * hDllHandle=0x01010000, unsigned long dwReason=1, void * lpreserved=0x00000000) Line 313 + 0xf bytes C mathdlld.dll!__DllMainCRTStartup(void * hDllHandle=0x01010000, unsigned long dwReason=1, void * lpreserved=0x00000000) Line 489 + 0x11 bytes C mathdlld.dll!_DllMainCRTStartup(void * hDllHandle=0x01010000, unsigned long dwReason=1, void * lpreserved=0x00000000) Line 459 + 0x11 bytes C ntdll.dll!_LdrpCallInitRoutine@16() + 0x14 bytes ntdll.dll!_LdrpRunInitializeRoutines@4() + 0x1c7 bytes ntdll.dll!_LdrpLoadDll@24() - 0x1b1 bytes ntdll.dll!_LdrLoadDll@16() + 0x110 bytes kernel32.dll!_LoadLibraryExW@12() + 0xc8 bytes regsvr32.exe!_wWinMain@16() + 0x741 bytes regsvr32.exe!_wWinMainCRTStartup() + 0x198 bytes kernel32.dll!_BaseProcessStart@4() + 0x23 bytes

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Re: [Boost-users] General Boost documentation
by James Hughes 24 Apr '06

24 Apr '06

Slightly off topic, but what I would find a great help with regards to learning Boost is a better description on what each library can do, and more importantly, what problems it solves. For example, perhaps someone has a problem they need to solve that a Boost lib will help with, but just reading through the top level of the documentation may not give them enough of a hint that this is the case. My pet one is simple loading and saving of configuration information in XML. Which library should/can I use for that? Serialisation? Or is there a better option? Or is there a boost lib in the wings perhaps aimed at that particular task? Another is Boost::graph - I see lots of questions about it on the list, but what real world problems does it solve? James ps. If nothing else of course, shared_ptr is ESSENTIAL!! > -----Original Message----- > From: Lynn Allan [mailto:l_d_allan@adelphia.net] > Sent: 24 April 2006 14:25 > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] General Boost documentation > > > John Krajewski wrote: > > I'm new to generic programming and finding the various concepts used > > in Boost quite confusing (named parameters, property maps, etc). Is > > there general documentation for the programming methods used in > > Boost? Perhaps a good book to buy? > > <alert comment="boost newbie"> > > Welcome to the club of confused, disoriented newbies <g>. > > Several suggestions: > > * Start with a VERY basic library and try to absorb "The Boost > Mentality". > > * Stair-step up to a somewhat more difficult library ... repeat as > necessary > > * At this point, the Karlsson book, "Beyond the C++ standard library" > might be helpful. For my purposes, the book had helpful regex > examples > (but regex is already relatively well documented, at least > compared to > several of the other Boost libraries I've wrestled with. Xpressive is > very well documented, IMHO) > > * Adapt a mindset that learning Boost is critical to your career, so > giving up is not an option. (and when your neurons align "just so", > Boost is kinda fun <g>) > > * Also a humble attitude ... you are "rubbing shoulders" with some > very smart people who are VERY busy, but passionate about Boost > prevailing in the marketplace. > > * Keep notes to share with others to perhaps shorten their learning > curve. > > I've found participants on this list to be VERY helpful and patient > with newbies, but they won't write your code for you. > > </alert> > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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Re: [Boost-users] General Boost documentation
by James Hughes 24 Apr '06

24 Apr '06

> > From: "James Hughes" <JHughes(a)Linx.co.uk> > > My pet one is simple loading and saving of configuration > information in > > XML. > > Which library should/can I use for that? Serialisation? Or > is there a > > better > > option? Or is there a boost lib in the wings perhaps aimed at that > > particular task? > > I'm assuming you are not following the current raging debate > on the boost > developers list, then. Your criterion is 'simple' meaning > simple to use, I > take it.... > Not following the developer list, but have seen the library in the 'up and coming' sectioon, hence the slightly loaded question!! > Currently being reviewed is just such a library, property_tree. > > It solves this particular constrained problem relatively > simply but isn't to > everyone's taste in design and implementation. > > The current debate has an element of 'purist vs pragmatist' > programming. > I'm purely pragmatic myself... > A 'simple' configuration file library *could* have multiple > layers and > components to decouple many different elements of design. In > becoming more > useful and extensible as separate components with clearly > defined roles, it > may perhaps be seen as less easy to use for this one role. > > That said, good motivating examples in documentation *can* > make a seemingly > complex collection of interacting classes seem just as simple > as a dedicated > 'property tree' as currently proposed. > I think that is am important point - an 'example' paints a thousand words as it were. I would add that a 'pragmatic' example is the best sort! > Sit down, relax and read the many current threads on the > developer list or > just go to the boost vault and download property_tree rev 5, > then run for > cover. > > > Another is Boost::graph - I see lots of questions about it > on the list, > > but > > what real world problems does it solve? > > On a more serious note, I completely agree (in general). A few more > motivating examples of problems solved would benefit both > existing and > potential new users. Quite. James

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Re: [Boost-users] [program_options] multitoken
by Sohail Somani 24 Apr '06

24 Apr '06

> -----Original Message----- > Edward Diener > Why not have the parameter as: > > "--first=11,12" > > instead of trying to create more than one parameter with the same > parameter name. > > Personally because of the type of solution I suggested, which is > probably the way most uses of such a multi-value value > parameter would > look like, with possibly a different separator than a comma, I do not > think a parameter library should have to cater to the same parameter > name more than once on the command line. What about parameters like -I for gcc? Utilities can add -I's to the command line. It would be an added headache to synchronize all these tools to eventually come up with a -I arg1,arg2,...

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Re: [Boost-users] General Boost documentation
by paul.floyd 24 Apr '06

24 Apr '06

> Slightly off topic, but what I would find a great help with regards to > learning Boost is a better description on what each library can do, and more > importantly, what problems it solves. The Karlsson book mentioned in the post you replied to contains a short summary of all the Boost libraries, and then goes on to cover 12 of them to greater depth. There's a book each dedicated to MPL and Boost::Graph. A+ Paul Accédez au courrier électronique de La Poste : www.laposte.net ; 3615 LAPOSTENET (0,34 /mn) ; tél : 08 92 68 13 50 (0,34/mn)

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managing "interesting syntax" checks
by Howard Gardner 24 Apr '06

24 Apr '06

/* This code detects the presence of particular syntax in a type. The relevant part is the template class syntax_member_insert: it will ramify into an unbounded set of similar classes, each of which is checking for some particular interesting bit of syntax. I am aware of parts of boost that grapple with this issue very directly: boost::concept_check The concepts to be checked are close kin to the syntax I'm looking for. boost::concept_traits Again, the concepts to be checked are close kin to the syntax I'm looking for. And I'm aware of parts of boost that touch on this issue indirectly: boost::function Contains a really nice mechanism for expressing function signatures. In point of fact, one effort that I made to generalize the implementation of syntax_member_insert yielded a solution with template classes like: template< typename x, typename xRet, typename xDummy = dummy, ... > struct member_function; template< typename x, typename xRet > member_function< x, xRet >; template< typename x, typename xRet, typename xP0 > member_function< x, xRet, xP0 >; These look suspiciously like the boost::functionX< > templates. boost::type_traits The is_* classes are used in one of the ways that I would want to use supports_syntax. boost::mpl Represents a *lot* of other uses for supports_syntax. It seems to me that it would be good to express this unbounded set of interesting syntax checks so that all of those facilities can use it. Does such a mechanism already exist? Is it feasable to create it using existing boost facilities? Is it feasable to create it at all? */ #include<ostream> using namespace std; template< typename xParm > struct syntax_member_insert { template< typename x, x & (x::*)( xParm ) = &x::insert > struct match; }; template< typename x, typename xSyntax > struct supports_syntax { private: typedef char ret_true; struct ret_false{ char c[2]; }; template< typename > static ret_false func( ... ); template< typename xX > static ret_true func( typename xSyntax::template match< xX > * ); public: static const bool value = ( sizeof( func< x >( 0 ) ) == sizeof( ret_true ) ); }; struct passes { passes & insert( char ); }; struct fails{}; int main() { cout << supports_syntax< passes, syntax_member_insert< char > >::value << endl; cout << supports_syntax< fails, syntax_member_insert< char > >::value << endl; }

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[program_options]How to save options to storage
by Ken 24 Apr '06

24 Apr '06

HI, BOOST I am sorry if this is a stupid question. I did not found similar question yet. Sometimes we need to read config from a file and change some values then need to save it. So how can I serialize an option_description to stream? Thanks a lot. Regards Ken

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i18n (and program_options)
by Christoph Duelli 24 Apr '06

24 Apr '06

Hi, I am using spirit and program_options so far. When Boost.Program_options fails to parse some command line options it throws an exception (which is fine). So far, I write (if e is such an exception) e.what() to stderr. An obvious example of the the output I get is 'unknown option ...' I would like to present my users a text in their own language (i.e. german). Does Boost or Boost.Program_options support i18n? If yes, how can I set the language to use? (Or is the intended use to catch the exception, analyze it and produce my own translation?) Best regards, Christoph

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