- Boost-users - lists.boost.org

Re: [Boost-users] Array to List
by noman javed 31 Jul '08

31 Jul '08

Actually I am working on numerical data.

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Xpressive and line breaks
by Simon Steele 30 Jul '08

30 Jul '08

Hi, I think there's a bug in Xpressive in Boost 1.35 with newline handling. Here is a very simple example: Subject: abc\ndef\nghi Regex: ^.+$ I'm looking for "abc". The following xpressive-based code has odd results: string text(argv[1]); sregex rex = sregex::compile(text, regex_constants::not_dot_newline); smatch match; string subject("abc\ndef\nghi"); if (regex_search(subject.begin(), subject.end(), match, rex, regex_constants::match_default)) { std::cout << "Match at: " << match.position(0) << " length: " << match.length(0); } ^.+$: Match at: 8 length: 3 $: Match at: 4 length: 0 .$: Match at: 10 length: 1 These definitely aren't right, it appears that the only place where end-of-line is matching is at end-of-string. Things get even stranger if I try to use Windows or Mac style end-of-line characters which I need to support too. If I use boost::regex instead then I get these results: ^.+$: Match at: 0 length: 3 $: Match at: 3 length: 0 .$: Match at: 2 length: 1 These are the results I'd expect. It appears in Xpressive that the check in assert_line_base::is_line_break is broken, the following line: if(traits_cast<Traits>(state).isctype(ch, this->newline_)) checks the previous character to see if it's a line break. I believe this should check the current character: if(traits_cast<Traits>(state).isctype(*state.cur_, this->newline_)) This then gets me sane results: ^.+$: Match at: 0 length: 3 $: Match at: 3 length: 0 .$: Match at: 2 length: 1 Is this a known bug? Thanks, Simon.

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[Conversion] imprecision with lexical_cast from double to std::string
by Andreas Ries 30 Jul '08

30 Jul '08

Hi, I'm using the borland toolset 5.8.2 under Win XP and have a problem doing the following: double val = 795.6352; string result = boost::lexical_cast <string> (val); the resulting string is: "795.63520000000005" with boost 1_35_0 the resulting string is: "795.6352000000001" with boost_1_34_0 Can anybody help?

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dll-interface problems
by Andrej van der Zee 30 Jul '08

30 Jul '08

Hi, I am not much of a Windows programmer, so I have a basic question. I want to make a library that (among other stuff) defines an exception like this: #include <boost/exception/exception.hpp> namespace speedo { typedef boost::error_info<struct tag_error, unsigned> error_info; class __declspec(dllexport) exception : public boost::exception { }; } When I try to compile this, I get the following warning: c:\cygwin\home\andrej\speedo\trunk\util\exception.h(14) : warning C4275: non dll-interface class 'boost::exception' used as base for dll-interface class 'speedo::exception' C:\cygwin\home\Andrej\speedo\trunk\boost/exception/exception.hpp(47) : see declaration of 'boost::exception' c:\cygwin\home\andrej\speedo\trunk\util\exception.h(13) : see declaration of 'speedo::exception' Is this a problem, and, how do I get rid of this without changing the boost-exception lib itself? Cheers, Andrej __________________________________________________________ Not happy with your email address?. Get the one you really want - millions of new email addresses available now at Yahoo! http://uk.docs.yahoo.com/ymail/new.html

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Reading a file with filesystem
by Simon Pickles 30 Jul '08

30 Jul '08

Hi Say I want to copy the contents of a file into memory, how do I do the actual copy. Eg boost::filesystem::path p = "file.txt" const unsigned int filesize = boost::filesystem::file_size( p ); unsigned char* buffer = new unsigned char[filesize]; // how do I copy file contents into buffer? Many thanks Simon

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boost::date_time
by Husain Das 30 Jul '08

30 Jul '08

I am using Visual C++ 9.0 2008 Express Edition with the pre-built boost libraries ver 1.35.0 for Windows . I am using the date_time functions from boost. Everything works fine till i decided to print the date objects through the to_simple_string(date) function . I receive the below linker errors . Can you guys advise me whats wrong ? public: char const * __clrcall boost::gregorian::greg_month::as_long_string(void)const " (?as_long_string@greg_month@gregorian@boost@@$$FQBMPBDXZ) referenced in function "public: static class std::basic_ostream<char,struct std::char_traits<char> > & __clrcall boost::date_time::month_formatter<class boost::gregorian::greg_month,class boost::date_time::iso_format<char>,char>::format_month(class boost::gregorian::greg_month const &,class std::basic_ostream<char,struct std::char_traits<char> > &)" (?format_month@?$month_formatter@Vgreg_month @gregorian@boost@@V?$iso_format@D@date_time@3@D@date_time@boost@ @$$FSMAAV?$basic_ostream@DU?$char_traits@D@std@@@std@ @ABVgreg_month@gregorian@3@AAV45@@Z) 1>ADONET_Example.obj : error LNK2028: unresolved token (0A00007D) "public: char const * __clrcall boost::gregorian::greg_month::as_short_string(void)const " (?as_short_string@greg_month@gregorian@boost@@$$FQBMPBDXZ) referenced in function "public: static class std::basic_ostream<char,struct std::char_traits<char> > & __clrcall boost::date_time::month_formatter<class boost::gregorian::greg_month,class boost::date_time::iso_format<char>,char>::format_month(class boost::gregorian::greg_month const &,class std::basic_ostream<char,struct std::char_traits<char> > &)" (?format_month@?$month_formatter@Vgreg_month @gregorian@boost@@V?$iso_format@D@date_time@3@D@date_time@boost@ @$$FSMAAV?$basic_ostream@DU?$char_traits@D@std@@@std@ @ABVgreg_month@gregorian@3@AAV45@@Z) 1>ADONET_Example.obj : error LNK2019: unresolved external symbol "public: char const * __clrcall boost::gregorian::greg_month::as_long_string(void)const " (?as_long_string@greg_month@gregorian@boost@@$$FQBMPBDXZ) referenced in function "public: static class std::basic_ostream<char,struct std::char_traits<char> > & __clrcall boost::date_time::month_formatter<class boost::gregorian::greg_month,class boost::date_time::iso_format<char>,char>::format_month(class boost::gregorian::greg_month const &,class std::basic_ostream<char,struct std::char_traits<char> > &)" (?format_month@?$month_formatter@Vgreg_month @gregorian@boost@@V?$iso_format@D@date_time@3@D@date_time@boost@ @$$FSMAAV?$basic_ostream@DU?$char_traits@D@std@@@std@ @ABVgreg_month@gregorian@3@AAV45@@Z) 1>ADONET_Example.obj : error LNK2019: unresolved external symbol "public: char const * __clrcall boost::gregorian::greg_month::as_short_string(void)const " (?as_short_string@greg_month@gregorian@boost@@$$FQBMPBDXZ) referenced in function "public: static class std::basic_ostream<char,struct std::char_traits<char> > & __clrcall boost::date_time::month_formatter<class boost::gregorian::greg_month,class boost::date_time::iso_format<char>,char>::format_month(class boost::gregorian::greg_month const &,class std::basic_ostream<char,struct std::char_traits<char> > &)" (?format_month@?$month_formatter@Vgreg_month @gregorian@boost@@V?$iso_format@D@date_time@3@D@date_time@boost@ @$$FSMAAV?$basic_ostream@DU?$char_traits@D@std@@@std@ @ABVgreg_month@gregorian@3@AAV45@@Z) 1>D:\Profiles\g18244\My Documents\Visual Studio 2008\Projects\DataSet\Debug\ADONET_Example.exe : fatal error LNK1120: 4 unresolved externals

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Array to List
by noman javed 30 Jul '08

30 Jul '08

I have two questions How can we convert an array (arbitrary type, arbitrary size) to mpl::list. Is there any metafunction in mpl which can do this for us ? Second is there any way to send mpl::list (or any mpl sequence) to MPI_Alltoallv without converting it into an array ?

2 1

boost program options and notifier call
by Aljaz 30 Jul '08

30 Jul '08

Hello I have boost.program_options implemented inside a config class. I want to call function (my_function) that is a member of config class for specific option (with notifier call). class config_class { public: void read_config() { po::options_description desc("Allowed options"); desc.add_options() ("help", "produce help message") ("include-path,I", po::value< vector<string> >()->notifier(&config_class::my_function), "include path"); } void my_function(vector<std::string> str) { } }; This wont compile and will give error for ..>()->notifier(&config_class::my_function)... >> error C2064: term does not evaluate to a function taking 1 arguments What am I doing wrong? Many thanks in advance! Aljaz

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boost::serialization - PHP -> c++ (fastcgi)
by Alejandro Martinez 30 Jul '08

30 Jul '08

What i need to do is this: Have a php file in a webserver, doing a POST with binary payload to a fast-cgi written in c++, and the c++ should deserialize that payload into a known struct. something like: struct whatever { int a; int b; float c; std::vector<int> d; } (mainly structs consisting of basic types and collections of basic types) I've been playing around with boost::serialization, but i can't seem to comprehend the binary format it generates (So i could hardcode the php to make a valid payload to be deserialised from the fast-cgi). And not so important: i've noticed boost::serialization to binary archives always look like: serialization::archive ÃõH@ can't i get rid of the "serialization::archive" thing that is obviusly not part of the struct i just serialized? Thanks a lot for your help. I'd appreciate any other ideas to accomplish the same result :).

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boost.asio and ncurses.h problem
by Ruben Lara 30 Jul '08

30 Jul '08

Hi all... If i try to compile boost.asio and ncurses.h together i get next problem: bermejo@BERMEJO-MOBILE ~/Proyecto/boost $ g++ -lncurses -lboost_system -lboost_thread -o main *.cpp /usr/include/boost/asio/detail/socket_option.hpp:242: error: ‘stdscr’ is not a type /usr/include/boost/asio/detail/socket_option.hpp:252: error: ‘stdscr’ is not a type /usr/include/boost/asio/detail/socket_option.hpp:252: error: expected identifier before ‘)’ token bermejo@BERMEJO-MOBILE ~/Proyecto/boost $ Problem when: #include <boost/asio.hpp> #include <ncurses.h> Any ideas? Thank you in advance Rubén Lara _________________________________________________________________ La última hora de tu ciudad en MSN Noticias http://noticias.es.msn.com/

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