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[Bind] creating a functio
by Robert Ramey 13 Apr '09

13 Apr '09

I'm in the process of figuring out how to use the bind library. The section on operators seems to me missing the "," operator. I see || and && operators which would seem well suited to wrapping a few functions into one - but these would only work for functions returning a bool. How can/should one proceed to get the same functionality of && with function objects which return void? It looks to me that the "," operator should be in there. Robert Ramey

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Boost.Test error in Xcode debug build
by DeNigris Sean 13 Apr '09

13 Apr '09

Hi list! When I run my Boost.Test app in Xcode 3.1.2 in a debug build, I get: > 817 Bus error or in the debugger: > Program received signal: “EXC_BAD_ACCESS”. > Stack: #0 0x001007c8 in boost::unit_test::framework::get at framework.ipp:387 > test_unit& > get( test_unit_id id, test_unit_type t ) > { > test_unit* res = s_frk_impl().m_test_units[id]; > Execution paused at this line (below): > if( (res->p_type & t) == 0 ) > throw internal_error( "Invalid test unit type" ); > > return *res; >} If I change to release build, everything runs fine. Any ideas? Sean DeNigris

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serialization singleton assert on iphone
by gtsml owevwr 13 Apr '09

13 Apr '09

Hi, I have an assert when exiting my application using the serialization lib of boost 1.38. BOOST_DLLEXPORT static T & get_instance() { static detail::singleton_wrapper<T> t; // refer to instance, causing it to be instantiated (and // initialized at startup on working compilers) assert(! detail::singleton_wrapper<T>::m_is_destroyed); use(instance); return static_cast<T &>(t); } The same code doesn't assert on windows XP so I guess that's something messy with static allocation on the iphone platform. On the iphone, the load/save code works well as long as it's not called when the application exit. As far I as I understand, I need to move my exit code somewhere else, when those singleton are still allocated. Can somebody confirm that? Or maybe I'm missing something... Any feedback warmly welcome! thanks

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Reading key-value pairs from a string
by Zdravko Monov 13 Apr '09

13 Apr '09

Dear boost-users, I am currently working on a C++ project that includes reading and parsing some files. Given a string with certain file contents S, I would like to attempt to compare it against a certain pattern. In particular, the contents have the form key : value. Certain keys are obligatory, while others may or may not exist (my program then supplies the default values). Can you recommend me a boost facility that can help me reading this type of data? My problem is that between key, : and value there could be blank spaces, tabs etc. The type of value could be a string, an int, or double. Thanks in advance!

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[program_options] Obtaining parameter order
by Adam Nielsen 13 Apr '09

13 Apr '09

Hi everyone, I'm writing a program that needs to know the order that parameters are supplied in, but I can't find anything in the docs about this. For example, a program to work with .zip files might work like this: zip --rename=one.bin:alpha.bin --add=one.bin --rename=one.bin:beta.bin The initial --rename would need to be acted upon first, before --add (otherwise one.bin would get overwritten) and likewise the last --rename must be acted upon after --add, otherwise the wrong file (or no file) would be renamed. If I use normal string vectors the order of the parameters will be lost so this won't work. Is this sort of parsing possible with program_options, or will I need to resort to writing my own command-line parsing code? Thanks, Adam.

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[Multi-Index] Suppressing warnings in VS2005 (VC8)
by Dominique Devienne 13 Apr '09

13 Apr '09

(I'm not sure this is strictly related to Multi-Index in fact) Hi. If I #include <boost/multi_index_container.hpp> #include <boost/multi_index/random_access_index.hpp> #include <boost/multi_index/ordered_index.hpp> #include <boost/multi_index/hashed_index.hpp> #include <boost/multi_index/composite_key.hpp> #include <boost/multi_index/mem_fun.hpp> I get boost\detail\allocator_utilities.hpp(182) : warning C4100: 'p' : unreferenced formal parameter (we compile with a low threshold for warnings) If I try to suppress it with: #if defined(_WIN32) && defined( _MSC_VER ) #pragma warning(push) #pragma warning(disable : 4100) // unreferenced formal parameter #endif #include <boost/multi_index_container.hpp> #include <boost/multi_index/random_access_index.hpp> #include <boost/multi_index/ordered_index.hpp> #include <boost/multi_index/hashed_index.hpp> #include <boost/multi_index/composite_key.hpp> #include <boost/multi_index/mem_fun.hpp> #if defined(_WIN32) && defined( _MSC_VER ) #pragma warning(pop) #endif I get even more warnings (way more). I suspect that I'm getting in the way of a built-in mechanism in Boost to suppress warnings with my own #pragma warning push/pop. So my question is how I can suppress this one little warning (well, because of the instantiation trail of the B.MI, it's a 65 lines "little" warning...) without disabling Boost's own warning suppression? Thanks, --DD

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Cant find boot/foreach.hpp files
by wuguangjun 13 Apr '09

13 Apr '09

Hello boost-users . I have build boost_1_38_0 with bjam on RedHat Entriprise 5.The bjam command is"bjam �toolset=gcc �build-type=complete install" When I compile cello99 trace DateSeries(A application based on boost), a error occur "boost/foreach.hpp: No such file or directory". I notice that in the directory "/usr/local/include/boost-1_38/boost" there exists the file "foreach.hpp". But in the directory"/usr/include/boost" do not have foreach.hpp file. I have tried other version boost_1_37 and boost_1_35.I dont know why? Could anyone help me? 2009-04-13 wuguangjun

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Boost.Accumulators: how to use with object data members?
by Joost Kraaijeveld 12 Apr '09

12 Apr '09

Hi, Is it possible to use Boost.Accumulators on data members of a class, with a UnaryFunction or Lamba function ? E.g. struct Data { double data; }; vector<Data> v; // Insert some Data objects here.... accumulator_set< double, features< tag::variance > > acc; acc = for_each( v.begin(), v.end(), ??????? ); cout << "Variance: " << variance(acc) << std::endl; where ???? is an arbitrary UnaryFunction or Lamda function something like "bind<void>( ref(acc), bind(&Data::data, _1)) )" (which did not do the trick) TIA -- Groeten, Joost Kraaijeveld Askesis B.V. Molukkenstraat 14 6524NB Nijmegen tel: 024-3888063 / 06-51855277 fax: 024-3608416 web: www.askesis.nl

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converting numbers to strings and padding the string if the number is within a specific range
by Sean Farrow 12 Apr '09

12 Apr '09

Hi all: I am in the process of writing a module for an application which requires me to convert a number to a string, and pad the string with a leading zero (0) if the number is within the range one to nine or in one case, one to 100. What is the best way of doing this using the boost libraries? Any help appreciated as always. Regards Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 4002 (20090411) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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Boost related jobs?
by Joseph A. Marks 12 Apr '09

12 Apr '09

Does anyone know of any Boost-related job openings in the Minneapolis area or in Minnesota (or telecommute)? Thanks, Sincerely, Joseph A. Marks e-mail: josephamarks(a)yahoo.com

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