January 2009 - Boost-users - lists.preview.boost.org

program_options.hpp issue
by S Josh 15 Jan '09

15 Jan '09

I am having compilation problem with program_options.hpp. I believe fix is simple. Current code: #if _MSC_VER > 1200 Proposed code: #if defined(_MSC_VER) && (_MSC_VER>1200) How dO I get this change incorporated into the boost source code? regards, Sandeep

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Re: [Boost-users] large enum and native array indexing
by Hicham Mouline 15 Jan '09

15 Jan '09

>I would say that the easiest way is to use the preprocessor. >#define BOOST_PP_LOCAL_MACRO(n) template<> struct >Position<BOOST_PP_CAT(OP, n)> { static const size_t value = n - 1; }; >#define BOOST_PP_LOCAL_LIMITS (1, MAX_OP) >#include BOOST_PP_LOCAL_ITERATE() >In Christ, >Steven Watanabe I think I wasn't clear enough: the 3rd party lib (which I can't change of course) provides, enum Op { OPone = 7, OPtwo = 9, OPthree = 45, OPfour = 7667 // there is no pattern in the names nor the numbers. }; // in fact, there are a hundred entries and I wished to generate from Op template<> struct Position<OPone> { static const int value = 0; } template<> struct Position< OPtwo > { static const int value = 1; } template<> struct Position< OPthree > { static const int value = 2; } template<> struct Position< OPfour > { static const int value = 2; } I suppose there is no way to automagically generate the template specs from the enum? regards,

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[lambda] Understanding placeholders
by Robert Jones 15 Jan '09

15 Jan '09

Why is this wrong? #include "boost/lambda/lambda.hpp" #include "boost/lambda/bind.hpp" #include <iostream> int main( ) { using namespace boost :: lambda; int i = 2, j = 3; bind( bind( protect( _1 = _2 ), _2, _1 ), _1, _2 )( i, j ); std :: cout << "i = " << i << ", j = " << j << "\n"; } Thanks, Rob.

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[gil] io extensions
by Jan Boehme 15 Jan '09

15 Jan '09

Hi, I need to use the bmp io extension and tried the 'old' one from the googlecode repo which doesn't work against boost 1.37. Should I use the 'io_new' stuff and if so is there a bit of sample code how to use it in case the user interface has changed? Thanks, Jan.

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program options: unrecognized command-line options
by Deane Yang 15 Jan '09

15 Jan '09

I'm using the program options library to parse both command-line and configuration file parameters. I'd like to know how to find command-line arguments that are *not* registered and therefore not recognized by the parser. I want to be able to print a warning message like "Following arguments were ignored:....".

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boost::enable_shared_from_this why?
by Germán Diago 15 Jan '09

15 Jan '09

Hello, reading the documentation for enable_shared_from_this, I can't understand why this kind of base class is needed. In the example code in the documentation, we have: class Y: public enable_shared_from_this<Y> { public: shared_ptr<Y> f() { return shared_from_this(); } } int main() { shared_ptr<Y> p(new Y); shared_ptr<Y> q = p->f(); assert(p == q); assert(!(p < q || q < p)); // p and q must share ownership } Isn't this piece of code equivalent (since the two pointers share ownership): class Y { }; int main(int argc, char * argv[]) { shared_ptr<Y> p(new Y); shared_ptr<Y> q(p); ... }

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Re: [Boost-users] [thread] assertion error in timed_lock
by Ernst Murnleitner 14 Jan '09

14 Jan '09

Dear Anthony, > > pthread_mutex_timedlock returned ETIMEDOUT. > > This bug has already been fixed. > Of cource, bugs happen. I used boost 1.36.0. Is the fix in 1.37.0? I had installed opensuse 11.1 which was released in december 2008. Boost 1.36.0 was released already in april 2008. Was the error detected so late or are there bug fixes somewhere which could be downloaded? I think there is no 1.36.1? Greetings Ernst > Anthony > -- > Anthony Williams | Just Software Solutions Ltd > Custom Software Development | http://www.justsoftwaresolutions.co.uk > Registered in England, Company Number 5478976. > Registered Office: 15 Carrallack Mews, St Just, Cornwall, TR19 7UL > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > -- Dr.-Ing. Ernst Murnleitner T +49 8761 722 00 67 F +49 8761 722 00 59 Awite Bioenergie GmbH Firmensitz: Angerstr. 9 a, D-85416 Langenbach Registergericht München, HRB 162652 Geschäftsführer: Dr.-Ing. Martin Grepmeier, Dr. Ing. Ernst Murnleitner *** Als Anti-Spam-Massnahme können uns EMails von Mail-Servern ohne gültigen ptr-record (Reverse DNS) nicht erreichen ***

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[serialization] Boost STATIC_WARNING when serializing shared_ptr of a type
by Daniel Roberts 14 Jan '09

14 Jan '09

I am trying to serialize a std::vector< boost::shared_ptr<SomeType> > but I am getting a boost STATIC_WARNING in get_derived_extended_type_info, when compiling the cpp file of the class that owns the vector. Here are the first few lines of the warning: 1>c:\program files (x86)\boost\boost_1_36_0\boost\serialization\extended_type_info_typeid.hpp(88) : warning C4099: 'boost::static_warning_impl<false>::STATIC_WARNING' : type name first seen using 'struct' now seen using 'class' 1> c:\program files (x86)\boost\boost_1_36_0\boost\static_warning.hpp(110) : see declaration of 'boost::static_warning_impl<false>::STATIC_WARNING' 1> c:\program files (x86)\boost\boost_1_36_0\boost\serialization\extended_type_info_typeid.hpp(85) : while compiling class template member function 'const boost::serialization::extended_type_info *boost::serialization::extended_type_info_typeid<T>::get_derived_extended_type_info(const T &) const' 1> with 1> [ 1> T=SomeNamespace::SomeType 1> ] If I create a std::vector<SomeType*>, then the warning goes away. I am including the serialization headers for std::vector and boost::shared_ptr. SomeType itself serializes a std::vector<boost::shared_ptr<SomeOtherType> >, where SomeOtherType IS polymorphic, and I get NO warnings for that one. The warning, to me, suggests that the compiler thinks that SomeType is polymorphic. Is the compiler really referring to SomeOtherType? Any assistance would be appreciated. Thanks

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[General] Warnings and pragmas in MSVC
by Robert Jones 14 Jan '09

14 Jan '09

I've written some code using the Lambda & Lambda.bind libraries, although I don't think that really matters, which produce a page ful of C4503 warnings, *4503 'identifier' : decorated name length exceeded, name was truncated* In my code I've tried using pragma disable around the lines which I altered to cause the warnings, but it makes no difference. Is it necessary to apply these pragmas within the Boost library code, or is there a better way? Thanks, Rob.

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Re: [Boost-users] [LibrariesUnderConstruction] update of LibrariesUnderConstruction wiki page
by vicente.botet 14 Jan '09

14 Jan '09

Hi, The wiki page Libraries Under Construction contains now much more entries. Good trip, Vicente ----- Original Message ----- From: "vicente.botet" <vicente.botet(a)wanadoo.fr> To: <boost(a)lists.boost.org>; <boost-announce(a)lists.boost.org>; <boost-users(a)lists.boost.org> Sent: Sunday, December 07, 2008 5:50 PM Subject: [LibrariesUnderConstruction] new LibrariesUnderConstruction wiki page Hi, I have created a new wiki page containing some of the libraries under construction for Boost. You can access this page from the Boost Trac wiki https://svn.boost.org/trac/boost/wiki > Projects > Libraries Under Construction or directly https://svn.boost.org/trac/boost/wiki/LibrariesUnderConstruction The contents of this page is by nature incomplete and outdated. Please help to maintain this page updated by modifying it directly (if you have the rights) or posting on the Boost mailing lists boost(a)lists.boost.org or boost-users(a)lists.boost.org with the prefix [LibrariesUnderConstruction]. If you're the author of one of these libraries and desire that all or part of the information related to your library be removed or modified, please send a mail or you can do it directly if you prefer. If you're a library author and plan on submitting a library but don't know when it will be ready for review, and you want to include your library in this list, please add it directly (if you have the rights) or send a mail. If you're a library author and plan on submitting a library for review in the next 3-6 months, email Ron Garcia or John Phillips ("garcia at osl dot iu dot edu" and "phillips at mps dot ohio-state dot edu" respectively) a short description of your library and they will add it to the Review Wizard Report Libraries Under Construction section. HTH, Vicente

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