March 2012 - Boost-users - lists.boost.org

encoding data when serializing
by Sean Farrow 09 Mar '12

09 Mar '12

Hi: Is there a way of telling boost serialization to encode everything to base64 when encoding to xml. We are using std::wstring primarily. Any help appreciated. Cheers Sean.

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[Spirit] Karma generator for JSON
by Ovanes Markarian 09 Mar '12

09 Mar '12

Hello Hartmut, as discussed @irc channel I am posting the example of my problem (I use boost 1.47): #include <boost/config/warning_disable.hpp> #include <boost/spirit/include/karma.hpp> #include <boost/spirit/include/karma_char_class.hpp> #include <boost/fusion/include/std_pair.hpp> #include <iterator> #include <cassert> #include <utility> #include <string> namespace karma = boost::spirit::karma; typedef std::pair<unsigned char, unsigned char> utf16_t; template<class OutIter> struct json_char_encoder2 : boost::spirit::karma::grammar<OutIter, std::string()> { json_char_encoder2() : json_char_encoder2::base_type(encoded_) { json_sym_.add ('"', "\\\"") ('/', "\\/") ('\\', "\\\\") ('\b', "\\b") ('\f', "\\f") ('\n', "\\n") ('\r', "\\r") ('\t', "\\t") ; using boost::spirit::iso8859_1::print; encoded_=*(json_sym_ | print | uchar_); uchar_ = karma::lit("\\u") << karma::hex << karma::hex; //also tried to use unicode_gen_; } karma::rule<OutIter, std::string()> encoded_; karma::symbols<char, char const*> json_sym_; karma::rule<OutIter, utf16_t()> uchar_; karma::uint_generator<unsigned short, 16> unicode_gen_; }; int main() { assert(2==sizeof(short)); typedef std::back_insert_iterator<std::string> iter_t; json_char_encoder2<iter_t> encoder2; std::string generated; iter_t sink(generated); std::string sinput="abc"; sinput.push_back(char(0xAA)); sinput.push_back(char(0xBB)); bool result = karma::generate(sink, encoder2, sinput); return 0; } The problem here is that I would like the generator in case of uchar_ to retrieve 2 subsequent string bytes and write them out as \uXXXX as specified at JSON.org. What I get is: a. IF: replacing utf16_t with unsigned short => and removing 1 of the karma::hex terminals => 2 calls where each byte is converted to unsigned short b. IF: having the source as it is => fails the generation, where the generated string is empty. One strange behavior as well: result is true for case b. Why? Regards, Ovanes

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boost::units question
by Mario Charest 09 Mar '12

09 Mar '12

Hello, I have been reading the doc and writing small program to learn about boost::units. Incredible tool !!! My question is one of proper programming, as I am not sure I fully understood the intricacy of boost::units. What I would like to acheive is a unit of thou, inch, feet. Then I want to be able to copy from variable to variable and have everything converted automatically myunit:thou aaa(50000*thou) myunit:inch bbb(50000*thou); myunit:feet ccc(50000*thou); myunit:thou ddd(50*inch); myunit:inch eee(50*inch); myunit:feet fff(50*inch); // and then std::cout << aaa << std::endl; etc... ccc = static_cast<myunit::feed>(aaa); .. and all various variation I came very close to getting this to work, just had some issue with the names and symbols showd by the inch and feed unit has they would be displayed in kthou (because of scalling I guess) ;-) I read the doc many times but couldn't really grasp how to deal with scaled units, how they fit with based_units and units? Regards, Mario

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Boost Users, Découvre le message de Veron...
by Badoo 09 Mar '12

09 Mar '12

Un message de Veron t'attend... L'expéditeur et le contenu seront visibles seulement par toi et tu peux le supprimer à tout moment. Tu peux aussi y répondre directement au travers du messenger. Pour découvrir le message, suis simplement ce lien: http://eu1.badoo.com/0272478031/in/hbnnNDOo1Ps/?lang_id=6&m=21&mid=4f5a1b87… D'autres personnes à proximité qui sont sur Badoo Seb (Meudon, France) Charlotte (Meudon, France) Nanou (Meudon, France) http://eu1.badoo.com/0272478031/in/hbnnNDOo1Ps/?lang_id=6&m=21&mid=4f5a1b87… Le lien ne fonctionne pas dans ce message ? Copie le dans la barre d'adresse de ton navigateur. Tu as reçu cet email suite à une requête de Veron auprès de notre système. S'il s'agit d'une erreur, ignore simplement cet email. La requête sera alors effacée du système. Merci, L'équipe Badoo Courrier automatique de Badoo suite à l'envoi d'un message à ton attention sur Badoo. Les réponses ne sont ni stockées, ni traitées. Si tu ne veux plus recevoir de messages de Badoo, fais-le nous savoir: http://eu1.badoo.com/impersonation.phtml?lang_id=6&mail_code=21&email=boost…

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FW: [thread] debug output when using futures/promises
by Nathan Ridge 09 Mar '12

09 Mar '12

>> Maybe I left some traces in the past but I don't see this output on the >> latest revision >> >> Could you update the trunk and let me know on which revision you are >> getting this? > I got this with revision 77102. I will try with the latest revision. You're right, it was removed a few days ago in r77224. Thanks, Nate

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[thread] debug output when using futures/promises
by Nathan Ridge 09 Mar '12

09 Mar '12

Hello, The following code, compiled with Boost trunk: #include <string> #include <boost/thread/future.hpp> int main() { boost::promise<std::string> p; boost::shared_future<std::string> f(p.get_future()); } Gives me the following output when I run it: 1334 0 1336 0 1347 0 1349 1 I have built Boost in release mode. What is causing this output? Can it be removed? Thanks, Nate

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zip_iterator and std::tuple (tr1) on msvc10
by MM 08 Mar '12

08 Mar '12

Hi, this code compiles: #include <vector> #include <list> #include <algorithm> #include <boost/iterator/zip_iterator.hpp> #include <boost/tuple/tuple.hpp> int main() { const std::vector<int> vi(5u); const std::list<int> li(5u); std::for_each( boost::make_zip_iterator(boost::make_tuple(vi.begin(), li.begin()) ), boost::make_zip_iterator(boost::make_tuple(vi.end(), li.end() ) ), []( const boost::tuple<const int&, const int&>& tpl ) { tpl; } ); return 0; } but this code doesn't on msvc10: #include <tuple> #include <vector> #include <list> #include <algorithm> #include <boost/iterator/zip_iterator.hpp> int main() { const std::vector<int> vi(5u); const std::list<int> li(5u); std::for_each( boost::make_zip_iterator( std::make_tuple(vi.begin(), li.begin()) ), boost::make_zip_iterator( std::make_tuple(vi.end(), li.end() ) ), []( const std::tuple<const int&, const int&>& tpl ) { tpl; } ); return 0; } Is msvc10 std::tuple not std compliant, or not boost::zip_iterator-compliant, or should zip_iterator impl change? Rds, MM

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[bind?] 'boost::bind' : ambiguous call to overloaded function -- when compiling for x64
by Igor R 08 Mar '12

08 Mar '12

Hello, My project builds well with MSVC10 for x86 platform. However, when I tried to build it for x64, I started to get the following strange error: 1>...cpp(42): error C2668: 'boost::bind' : ambiguous call to overloaded function 1> ...\boost\boost/bind/bind_mf_cc.hpp(43): could be 'boost::_bi::bind_t<R,F,L> boost::bind<void,MyImpl,const boost::system::error_code&,boost::shared_ptr<T>,boost::system::error_code>(R (__cdecl MyImpl::* )(B1),A1,A2)' <...> 1> ...\boost\boost/bind/bind_mf_cc.hpp(43): or 'boost::_bi::bind_t<R,F,L> boost::bind<void MyImpl,const boost::system::error_code&,boost::shared_ptr<T>,boost::system::error_code>(R (__cdecl MyImpl::* )(B1),A1,A2)' Note that the both variants are actually the same one. The source line that causes the error looks like this: io_service_.post(boost::bind(&MyImpl::func, someSharedPtr)); i.e. boost::bind name is fully qualified. Unfortunately, I can't reproduce this error in a "fresh" trivial project, so I realize that the problem most likely isn't in Bind, but somewhere in my project. The question is what could cause such a behavior? Did anyone encounter such an issue? Thanks.

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boost includes
by bhatiaharsh 08 Mar '12

08 Mar '12

Hi, I am new to boost, just trying to use it for the first time. I have a test code which uses Boost and I am trying to get it running on my machine. But I get an error while compilation: In file included from /usr/include/boost/mpl/or.hpp:43:0, from /usr/include/boost/serialization/smart_cast.hpp:54, from /usr/include/boost/archive/detail/oserializer.hpp:41, from /usr/include/boost/archive/detail/interface_oarchive.hpp:23, from /usr/include/boost/archive/detail/common_oarchive.hpp:22, from /usr/include/boost/archive/basic_text_oarchive.hpp:32, from /usr/include/boost/archive/text_oarchive.hpp:31, from src/main.cc:1207: /usr/include/boost/mpl/aux_/include_preprocessed.hpp:37:90: fatal error: boost/mpl/aux_/preprocessed/gcc/||.hpp: No such file or directory compilation terminated. make[2]: *** [obj/debug/critpts.o] Error 1 This is the line 37 of file /usr/include/boost/mpl/aux_/include_preprocessed.hpp include BOOST_PP_STRINGIZE(boost/mpl/aux_/preprocessed/AUX778076_PREPROCESSED_HEADER) It looks like AUX778076_PREPROCESSED_HEADER is not defined correctly. Any ideas where I could go and check for this ? -- View this message in context: http://boost.2283326.n4.nabble.com/boost-includes-tp4454829p4454829.html Sent from the Boost - Users mailing list archive at Nabble.com.

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BGL VA? (UNCLASSIFIED)
by Neiderer, Andrew M CIV (US) 08 Mar '12

08 Mar '12

Classification: UNCLASSIFIED Caveats: NONE Not a boost programming question exactly. I am mostly a visual analytics (VA) programmer using X3D to interact/navigate w/i a visualization. And for most of the past year learning/using BGL to build and traverse small graphs represention, e.g. terrorist networks, for information discovery. Is there just 1 existing parser (AT&T Graphviz DOT) for r/w from a text file? This format is quite good for examining graphs; and maybe it can do 3D position vectors. But just wondering if I should consider others for 3D display of networks, and for a visual analytics technology. Hope this q is appropriate, or maybe I should become more familiar with BGL first. Andrew M. Neiderer US Army Research Laboratory Classification: UNCLASSIFIED Caveats: NONE

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