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boost::is_less::result_type
by Arno Schödl 18 Mar '09

18 Mar '09

Shouldn't boost::is_less et. al. define typedef bool result_type; for interoperability with boost::bind? Arno -- Dr. Arno Schoedl · aschoedl(a)think-cell.com Technical Director think-cell Software GmbH · Invalidenstr. 34 · 10115 Berlin, Germany http://www.think-cell.com · phone +49-30-666473-10 · toll-free (US) +1-800-891-8091 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl · Amtsgericht Charlottenburg, HRB 85229

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Google SOC Mentors?
by John Maddock 18 Mar '09

18 Mar '09

Would folks willing to mentor students for this years GSOC please step forward and make themselves known? We need both people to assist in assessing the student applications, and experienced Boosters to mentor the students themselves. We really need to get some new blood into this if our SOC participation is to continue - we can't rely on the "usual suspects" taking this on year after year - in short, "Your Boost Needs You!". Regards, John Maddock.

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Re: [boost] [lexical_cast] Strange behaviour
by raindog＠macrohmasheen.com 18 Mar '09

18 Mar '09

What exactly do you think -1 is as an unsigned int? ------Original Message------ From: Robert Jones Sender: boost-bounces(a)lists.boost.org To: boost(a)lists.boost.org ReplyTo: boost(a)lists.boost.org Sent: Mar 18, 2009 9:03 AM Subject: [boost] [lexical_cast] Strange behaviour Trying again 'cos I mucked up the code last time! This code #include <iostream> #include <boost/lexical_cast.hpp> int main() { using namespace std; try { unsigned int u=boost::lexical_cast<unsigned int>("-1"); cout << u << '\n'; } catch(const std::exception&) { cout << "Exception" << '\n'; } } produces 4294967295 on MSVC7 & 8 rather than an exception. Is it supposed to do this? Rob. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost Sent from my Verizon Wireless BlackBerry

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Re: [boost] Range_Ex and Multi-Index: conflicting mpl::begin and boost::begin
by JOAQUIN M. LOPEZ MUÑOZ 18 Mar '09

18 Mar '09

________________________________________ De: boost-bounces(a)lists.boost.org [boost-bounces(a)lists.boost.org] En nombre de Joaquin M Lopez Munoz [joaquin(a)tid.es] Enviado el: miércoles, 18 de marzo de 2009 19:49 Para: boost(a)lists.boost.org Asunto: Re: [boost] Range_Ex and Multi-Index: conflicting mpl::begin and boost::begin > Sandeep Gupta <gupta.sandeep <at> gmail.com> writes: > > > Thanks for looking into this Vicente. I am not directly adding > > boost::mpl to the namespace. Please find attached the code. Below is > > the full error. > > > [...] > > /home/sandeep/Computing/boost_1_38_0/boost/range_ex/./detail/ > > adl_begin_end.hpp:27: > > error: in call to ‘begin’ [...] Adding to my previous post, I found the following in the Boost users list: http://lists.boost.org/boost-users/2006/01/16513.php Seems related, doesn't it? Alas the thread concludes with no satisfactory answer. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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Range_Ex and Multi-Index: conflicting mpl::begin and boost::begin
by Sandeep Gupta 18 Mar '09

18 Mar '09

Hi, I am under-impression that for_each construct of range_ex for all container concepts. However when I tried with multi-index it gave conflicting errors. Attached below is the code and corresponding errors. code: typedef multi_index_container< std::pair<value_type,int>, indexed_by< ordered_unique<member<pair<value_type,int>, value_type, &pair<value_type, int>::first> >, ordered_unique<member<pair<value_type,int>, int, &pair<value_type, int>::second> > > > mic; mic serialStore; for_each(serialStore, std::cout<<boost::lambda::_1<<' '); error: /home/sandeep/Computing/boost_1_38_0/boost/mpl/begin_end_fwd.hpp:22: error: ‘template<class Sequence> struct boost::mpl::begin’ is not a function, /home/sandeep/Computing/boost_1_38_0/boost/range/begin.hpp:96: error: conflict with ‘template<class T> typename boost::range_iterator::type boost::begin(T&)’ /home/sandeep/Computing/boost_1_38_0/boost/range_ex/./detail/adl_begin_end.hpp:27: error: in call to ‘begin’ /home/sandeep/Computing/boost_1_38_0/boost/mpl/begin_end_fwd.hpp:23: error: ‘template<class Sequence> struct boost::mpl::end’ is not a function, /home/sandeep/Computing/boost_1_38_0/boost/range/end.hpp:92: error: conflict with ‘template<class T> typename boost::range_iterator::type boost::end(T&)’ /home/sandeep/Computing/boost_1_38_0/boost/range_ex/./detail/adl_begin_end.hpp:35: error: in call to ‘end’ I apologies in advance if this is due to trivial omission. Thanks -sandeep

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[soc2009] Boost is in summer of code 2009: attention mentors
by troy d. straszheim 18 Mar '09

18 Mar '09

All, We've just been accepted as an organization in Google's Summer of Code 2009. Per this user's guide: http://socghop.appspot.com/document/show/program/google/gsoc2009/userguide those who have volunteered to mentor need to create a site-wide profile, and apply to mentor for Boost, then I'll click you in. Student applications start March 23rd. Until then: - Plan your application. - Brainstorm about project ideas on the mailing lists and IRC. - Familiarize yourself with existing work in the areas you are interested in by reading the mailing list archives and playing with existing Boost libraries. - Make proposals and get feedback. More as I get it. Thanks to Google and their Melange dev team. Looking forward to a good GSOC 2009. -t

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Boost::Format add-on
by Joel Falcou 18 Mar '09

18 Mar '09

Who is in charge of Format maintenance ? I would like to propose a simple patch to add an accessor to the number of arguments expected by the formating : int args() const { return num_args_; } Regards

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[array] change proposal for the c_array() function
by herve martin 18 Mar '09

18 Mar '09

Hi, I'm new in this mailing list .My interest are embedded software and code reuse. I would submit a simple change request in the boost::array library. The boost::c_array() function is expected to cast a boost::array<T,N> into a C-array but actually the returned type is a T* which is not exactly a reference on a C-array. to keep track of the static size and make sizeof( myarray.c_array() ) returning the real size of the C-array, I suggest to change: T* c_array() { return elems; } into T (&c_array())[N] { return *(T(*)[N]) elems; } by the way, I have developed a function helper array_cast<> whose purpose is to: * make a bit more friendly the syntax when casting to a C-array * check consistency between size of the input type and size of the target C-array for example, { long titi; char (&test)[4] = utils::array_cast<char>( titi ); test[0] = 0; } assuming that long is 32 bit long and char is 8 bit long, 'test[0]' is now a reference on the 1st byte of 'titi'. Moreover declaring test as a char(&)[5] would have failed in compiling since size of both types are not suitable (but the function provides some other way to force cast when sizes are not compatible) do you think that there could be any interest to include this function in boost library ? thanks, herve

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Why my subexpression doesn't work in Regex
by Qihong Wang 18 Mar '09

18 Mar '09

Hello, I'm a new boost and regex user. I tried a c++ regex sample as follows regex pattern("banan\\(an\\)*a"); string str = "bananana"; if(regex_match(str, pattern)) cout<<"---- pattern matched ----"<<endl; else cout<<"---- pattern unmatched ----"<<endl; To my surprise, the it printed out pattern unmatched. If I change str to "banan(an)a", the result is pattern matched. Feels like boost.Regex doesn't treat ( ) as subexpression. Any idea? Thanks, Qihong Wang

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[lexical_cast] Strange behaviour
by Robert Jones 18 Mar '09

18 Mar '09

Trying again 'cos I mucked up the code last time! This code #include <iostream> #include <boost/lexical_cast.hpp> int main() { using namespace std; try { unsigned int u=boost::lexical_cast<unsigned int>("-1"); cout << u << '\n'; } catch(const std::exception&) { cout << "Exception" << '\n'; } } produces 4294967295 on MSVC7 & 8 rather than an exception. Is it supposed to do this? Rob.

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