July 2011 - Boost-users - lists.boost.org

determine whether the compilation is occuring on mac os
by Sean Farrow 22 Jul '11

22 Jul '11

Hi: I'm writing a cross platform app and need to determine whether I am compiling on windows/mac os. I note there is a windows configuration define in boost.config, but is there an equivalent mac one? Cheers Sean.

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Boost.Iterator runtime assertion with MSVC
by Narinder Claire 22 Jul '11

22 Jul '11

Hello The following piece of code : ____________________ #include<string> #include<map> #include<iostream> #include<iterator> #include<boost/iterator/transform_iterator.hpp> typedef std::map<std::string, int> map; typedef map::const_iterator const_iterator; struct transformer { typedef std::string result_type; const result_type & operator()(const std::pair<const result_type, int> & thePair)const { return thePair.first; } }; typedef boost::transform_iterator<transformer, const_iterator > const_key_iterator; int main() { map m; m["one"]=1; m["two"]=2; const_key_iterator key_iterator(m.begin(),transformer()); // Following 3 lines work fine const std::string &temp = *key_iterator; std::string::const_iterator it_works = temp.begin(); std::cout << *it_works; // Following 2 lines cause crash when // compiled with VS2010 & VS2008 std::string::const_iterator it_fails = key_iterator->begin(); std::cout << *it_fails ; } ________________________________ executes fine when compiled with mingw(gcc 4.5.2) and gcc 4.5.2(Ubuntu 11.04) but crashes when compiled with VS2010 & VS2008. The issue seems to be something about not being allowed to dereference an iterator toa string. Can anyone shed any light on this ? I ensured that language extensions were NOT disabled. Rgds N

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Using thread library in MFC DLL causes assertion failure
by Kean Mariotti 22 Jul '11

22 Jul '11

Hi everybody, I am working on a MFC DLL project with Visual Studio 2010. Since I have started to use the boost thread library in my DLL I get error messages, when from another program I try to dynamically load the DLL. I recreated the problem, apparently the errors occur when from any MFC DLL project is included one header of the thread library (I tried with barrier.hpp, condition_variable.hpp and thread.hpp). Below is shown what the messages look like: 1. Debug assertion failed! Program: ... File: ...\dllinit.cpp Line: 607 2. then I press ignore... 3. Debug assertion failed! Program: ... File: ...\dllmodul.cpp Line: 135 4. then I press ignore and the program correctly goes on with its execution... I have found an older thread in which was explained a very similar issue: http://comments.gmane.org/gmane.comp.lib.boost.user/49747 but apparently nothing has been fixed since that time. I hope somebody has a suggestion.

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boost::units primer needed
by Michael Powell 21 Jul '11

21 Jul '11

Boost Units users, I need to find a *really* good boost::units primer to get me started. we've got some units-based calculations that need to be developed and I hope to make use of boost in order to facilitate those calculations taking place. so far what I am thinking of as a basic type calculation isn't panning out quite right, more likely I am failing to grasp just what I need to do to string together the quantities in accordance with the units framework which allows the calculations to happen properly... I don't know if any of this is making sense. Kind regards, Michael

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[Review] Lockfree review starts today, July 18th
by Hartmut Kaiser 21 Jul '11

21 Jul '11

Hi all, The review of Tim Blechmann's Boost.Lockfree library starts today, July 18th 2011, and will end on July 28th. I really hope to see your vote and your participation in the discussions on the Boost mailing lists! ----------------------------------------------------- About the library: Boost.Lockfree provides implementations of lock-free data structures. Lock-free data structures can be accessed by multiple threads without the necessity of blocking synchronization primitives such as guards. Lock-free data structures can be used in real-time systems, where blocking algorithms may lead to high worst-case execution times, to avoid priority inversion, or to increase the scalability for multi-processor machines. The following data structures are provided: - boost::lockfree::fifo, a lock-free fifo queue - boost::lockfree::stack, a lock-free stack - boost::lockfree::atomic_int, an atomic integer class The library is accessible from here: http://tim.klingt.org/boost_lockfree.tag.gz. Boost.Lockfree depends on C++0x atomics. They are not well supported with current compilers yet. For this reason Boost.Lockfree depends on the *unreviewed* Boost.Atomic library, that emulates C++0x atomics for C++98. This review is about Boost.Lockfree and not about Boost.Atomic, although it is included in the tarball and the git repository. If Boost.Lockfree will be accepted, it won't be merged into trunk before Boost.Atomic is accepted. --------------------------------------------------- Please always state in your review, whether you think the library should be accepted as a Boost library! Additionally please consider giving feedback on the following general topics: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? Regards Hartmut Review Manager

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[Serialization] getting version of items stored in STL collection
by cc caprani 21 Jul '11

21 Jul '11

I'm converting parts of a program to use boost::shared_ptr. I have a vector of pointers to objects std::vector<Object*> which now becomes std::vector<ObjectPtr> where ObjectPtr = make_shared<Object>(). I must support archives (XML files) created previously. Boost::serialization looks after saving STL collections very nicely. However, now, in reading a file, I need to determine the item_version in the collection so I can read in a vector of Object* or ObjectPtr. I also need to change the item_version when saving new files to indicate ObjectPtrs are being saved. I've dug through the documentation and source for hours but can't find anything that I can use (my own limitations perhaps?). This vector is NOT a class member and so class versioning does not apply unfortunately. Also, I am using bespoke load/save functions and NOT the serialize(Archive& ar, const unsigned int version) which would avoid this problem (I posted about this before - due to move from MFC to boost and mix of Doc/View architecture). I realize now I should have put a class version member of the MyAppDoc file structure which would be read in first. This would save all the pain. I've written some functions to interface with the file for the meantime, but I'm sure there must be a better solution: template<class Archive, class T> inline void load_vsp_from_vp(Archive& ar, std::vector<boost::shared_ptr<T>>& vPtr, const char* name) { std::vector<T*> vT; ar & boost::serialization::make_nvp(name, vT); boost::shared_ptr<T> ptr; vPtr.assign(vT.size(), ptr); for(int i = 0; i != vT.size(); ++i) vPtr.at(i).reset( vT.at(i) ); } template<class Archive, class T> inline void save_vp_from_vsp(Archive& ar, std::vector<boost::shared_ptr<T>>& vPtr, const char* name) { std::vector<T*> vT; for(int i = 0; i != vPtr.size(); ++i) vT.push_back( vPtr.at(i).get() ); ar & boost::serialization::make_nvp(name, vT); } Use as: save_vp_from_vsp<boost::archive::xml_oarchive, Object>(oa, m_vObject, "m_vObject"); Any help appreciated.

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Re: [Boost-users] Boost String Algo Compilation failure
by Narinder Claire 21 Jul '11

21 Jul '11

Resolved Language extensions were disabled in the project settings. Re-enabling them allowed successful compilation. Rgds N

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boost interprocess intrusive_ptr question
by Brian 20 Jul '11

20 Jul '11

Hello I'm having a bit of trouble with something and I was hoping someone would be able to help me out. I'm using boost interprocess. Here's what I have: class Animal { ... code removed... } class Dog : public Animal { ... code removed... } class Cat : public Animal { ... code removed... } typedef boost::interprocess::allocator<intrusive_ptr<Animal, offset_ptr<Animal> >, managed_shared_memory::segment_manager> ShmemAllocator; typedef vector<intrusive_ptr<Animal, offset_ptr<Animal> >, ShmemAllocator> MyVector; int main(int argc, char * const argv[]) { ..code removed.. managed_shared_memory segment(create_only, "MySharedMemory", 65536); const ShmemAllocator alloc_inst(segment.get_segment_manager()); MyVector *myVector = segment.construct<MyVector>("MyVector")(alloc_inst); intrusive_ptr<Dog, offset_ptr<Dog> > dogPtr(segment.construct<Dog>("DogPtr")()); myVector->push_back(dogPtr); The myVector->push_back(dogPtr) line gives the following error: error: no matching function for call to 'boost::container::vector<boost::interprocess::intrusive_ptr<Animal, boost::interprocess::offset_ptr<Animal> >, boost::interprocess::allocator<boost::interprocess::intrusive_ptr<Animal, boost::interprocess::offset_ptr<Animal> >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >::push_back(boost::interprocess::intrusive_ptr<Dog, boost::interprocess::offset_ptr<Dog> >&)' I have been unable to get this to work. Can someone please tell me how to get my dogPtr into my Animal array? I was able to get it to work like this: intrusive_ptr<Animal, offset_ptr<Animal> > animalPtr(dynamic_pointer_cast<Animal>(dogPtr.get())); myVector->push_back(animalPtr); But that's kind of ugly, creating a new variable and all. I'm hoping I don't have to do that. Many thanks

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Boost String Algo Compilation failure
by Narinder Claire 20 Jul '11

20 Jul '11

Hello The following piece won't code : ----------------------------------- #include<string> #include<vector> #include<boost/algorithm/string.hpp> int main() { std::string str1("hello abc-*-ABC-*-aBc goodbye"); typedef std::vector< std::string > split_vector_type; split_vector_type SplitVec; // #2: Search for tokens boost::split( SplitVec, str1, boost::is_any_of("-*"), boost::token_compress_on ); } ----------------------------------------- compiles successfully with gcc 4.5.2(Linux) & VS2008 but fails with VS2010 with the following output: ------------------------------------------ 1>------ Build started: Project: main, Configuration: Debug Win32 ------ 1> main.cpp 1>c:\boost_1_47_0\boost\algorithm\string\find_iterator.hpp(184): warning C4224: nonstandard extension used : formal parameter 'Collection' was previously defined as a type 1>c:\boost_1_47_0\boost\algorithm\string\find_iterator.hpp(364): warning C4224: nonstandard extension used : formal parameter 'Collection' was previously defined as a type 1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(2227): warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' 1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(2212) : see declaration of 'std::_Copy_impl' 1> c:\boost_1_47_0\boost\algorithm\string\detail\classification.hpp(102) : see reference to function template instantiation '_OutIt std::copy<const char*,char*>(_InIt,_InIt,_OutIt)' being compiled 1> with 1> [ 1> _OutIt=char *, 1> _InIt=const char * 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\classification.hpp(206) : see reference to function template instantiation 'boost::algorithm::detail::is_any_ofF<CharT>::is_any_ofF<boost::iterator_range<IteratorT>>(const RangeT &)' being compiled 1> with 1> [ 1> CharT=char, 1> IteratorT=const char *, 1> RangeT=boost::iterator_range<const char *> 1> ] 1> d:\workspace\papafactory\develop\boost.string.split\main.cpp(15) : see reference to function template instantiation 'boost::algorithm::detail::is_any_ofF<CharT> boost::algorithm::is_any_of<const char[3]>(RangeT (&))' being compiled 1> with 1> [ 1> CharT=char, 1> RangeT=const char [3] 1> ] 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2146: syntax error : missing ',' before identifier 'traversal_category' 1> c:\boost_1_47_0\boost\concept\detail\has_constraints.hpp(42) : see reference to class template instantiation 'boost::range_detail::SinglePassIteratorConcept<Iterator>' being compiled 1> with 1> [ 1> Iterator=std::_String_iterator<char,std::char_traits<char>,std::allocator<char>> 1> ] 1> c:\boost_1_47_0\boost\concept\detail\msvc.hpp(53) : see reference to class template instantiation 'boost::concepts::not_satisfied<Model>' being compiled 1> with 1> [ 1> Model=boost::range_detail::SinglePassIteratorConcept<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\boost_1_47_0\boost\range\concepts.hpp(259) : see reference to class template instantiation 'boost::concepts::require<Model>' being compiled 1> with 1> [ 1> Model=boost::range_detail::SinglePassIteratorConcept<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\boost_1_47_0\boost\concept\detail\has_constraints.hpp(42) : see reference to class template instantiation 'boost::SinglePassRangeConcept<T>' being compiled 1> with 1> [ 1> T=const boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\boost_1_47_0\boost\concept\detail\msvc.hpp(53) : see reference to class template instantiation 'boost::concepts::not_satisfied<Model>' being compiled 1> with 1> [ 1> Model=boost::SinglePassRangeConcept<const boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>>> 1> ] 1> c:\boost_1_47_0\boost\range\algorithm\equal.hpp(162) : see reference to class template instantiation 'boost::concepts::require<Model>' being compiled 1> with 1> [ 1> Model=boost::SinglePassRangeConcept<const boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>>> 1> ] 1> c:\boost_1_47_0\boost\range\iterator_range_core.hpp(434) : see reference to function template instantiation 'bool boost::range::equal<boost::iterator_range<IteratorT>,boost::iterator_range<IteratorT>>(const SinglePassRange1 &,const SinglePassRange2 &)' being compiled 1> with 1> [ 1> IteratorT=std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>, 1> SinglePassRange1=boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>>, 1> SinglePassRange2=boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\find_iterator.hpp(328) : see reference to function template instantiation 'bool boost::operator ==<IteratorT,IteratorT>(const boost::iterator_range<IteratorT> &,const boost::iterator_range<IteratorT> &)' being compiled 1> with 1> [ 1> IteratorT=std::_String_iterator<char,std::char_traits<char>,std::allocator<char>> 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\find_iterator.hpp(322) : while compiling class template member function 'bool boost::algorithm::split_iterator<IteratorT>::equal(const boost::algorithm::split_iterator<IteratorT> &) const' 1> with 1> [ 1> IteratorT=input_iterator_type 1> ] 1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(373) : see reference to class template instantiation 'boost::algorithm::split_iterator<IteratorT>' being compiled 1> with 1> [ 1> IteratorT=input_iterator_type 1> ] 1> c:\boost_1_47_0\boost\iterator\transform_iterator.hpp(49) : see reference to class template instantiation 'std::iterator_traits<_Iter>' being compiled 1> with 1> [ 1> _Iter=find_iterator_type 1> ] 1> c:\boost_1_47_0\boost\iterator\transform_iterator.hpp(75) : see reference to class template instantiation 'boost::detail::transform_iterator_base<UnaryFunc,Iterator,Reference,Value>' being compiled 1> with 1> [ 1> UnaryFunc=copy_range_type, 1> Iterator=find_iterator_type, 1> Reference=boost::use_default, 1> Value=boost::use_default 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\iter_find.hpp(168) : see reference to class template instantiation 'boost::transform_iterator<UnaryFunc,Iterator>' being compiled 1> with 1> [ 1> UnaryFunc=copy_range_type, 1> Iterator=find_iterator_type 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\split.hpp(149) : see reference to function template instantiation 'SequenceSequenceT &boost::algorithm::iter_split<SequenceSequenceT,RangeT,boost::algorithm::detail::token_finderF<PredicateT>>(SequenceSequenceT &,RangeT &,FinderT)' being compiled 1> with 1> [ 1> SequenceSequenceT=split_vector_type, 1> RangeT=std::string, 1> PredicateT=boost::algorithm::detail::is_any_ofF<char>, 1> FinderT=boost::algorithm::detail::token_finderF<boost::algorithm::detail::is_any_ofF<char>> 1> ] 1> d:\workspace\p\develop\boost.string.split\main.cpp(15) : see reference to function template instantiation 'SequenceSequenceT &boost::algorithm::split<split_vector_type,std::string,boost::algorithm::detail::is_any_ofF<CharT>>(SequenceSequenceT &,RangeT &,PredicateT,boost::algorithm::token_compress_mode_type)' being compiled 1> with 1> [ 1> SequenceSequenceT=split_vector_type, 1> CharT=char, 1> RangeT=std::string, 1> PredicateT=boost::algorithm::detail::is_any_ofF<char> 1> ] 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2065: 'traversal_category' : undeclared identifier 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2146: syntax error : missing ',' before identifier 'traversal_category' 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2065: 'traversal_category' : undeclared identifier 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2893: Failed to specialize function template 'boost::concepts::require<Model> boost::concepts::require_(void (*)(Model))' 1> With the following template arguments: 1> 'boost::Convertible' 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2056: illegal expression ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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Linking error in boost program options under Windows
by Marc de Kamps 20 Jul '11

20 Jul '11

I'm linking to boost programming options under windows. I get the following linker error: miind.obj : error LNK2001: unresolved external symbol "public: static unsigned int const boost::program_options::options_description::m_default_line_length" I am using the BoostPro installer version for boost 1.47 under windows XP using Visual Studio 10. I link against: boost_program_options-vc100-mt-gd-1_47.lib in Debug mode. If I don't link against it I get a lot more missing symbols, so it's not simply a matter of forgetting to the boost program options library. The problem occurs in the Debug and Release version. The same code compiles under Linux. Marc

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