November 2007 - Boost - lists.preview.boost.org

[1.35.0] branches/release open for known-good merges
by Beman Dawes 09 Dec '07

09 Dec '07

Until further notice, branches/release is open for known-good merges. "known-good" means changes that are already passing trunk regression tests, or are in files like documentation that have no effect on testing. Thus if you make a bug fix in trunk, wait a day or two before committing a merge of the fix to branches/release and look at the regression test results before you commit. Make sure in particularly the change doesn't break other libraries. Thanks, --Beman

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Boost Threads Condition may block forever on clock change
by ak1mbox-boost＠yahoo.ca 07 Dec '07

07 Dec '07

Hello, I've noticed a strange change in behaviour when condition is called with xtime parameter, condition::timed_wait. If right after the condition is called the clock is moved back the code never exits from condition unless signalled, even moving the clock back forward did not seem to fix the problem. The test was done on Windows XP. Is this desired behaviour or a bug? It seems strange that the condition is based on the current time and not just on a time offset. Any help with resolving this would be really appreciated. Thank you, Alex

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constrained_value.hpp
by Joe Gottman 07 Dec '07

07 Dec '07

One implementation detail of the date_time library is the constrained_value template class (constrained_value.hpp). I think this class is useful enough that it should be part of boost's public interface (maybe part of the utility library). After 1.35 is released, how difficult would it be to move this into the public interface? Joe Gottman

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Lots of warnings
by Robert Dailey 04 Dec '07

04 Dec '07

The ptr_container header files seem to be causing a lot of very verbose and annoying warning messages on Visual Studio 2008 at warning level 4 (highest). I'm not sure if this is my fault or what, but I was hoping you guys could verify if this is your issue or mine. Thanks. Below are the warnings I'm getting: 1>c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\move.hpp(23) : warning C4512: 'boost::ptr_container_detail::move_ptrs::move_source<Ptr>' : assignment operator could not be generated 1> with 1> [ 1> Ptr=boost::ptr_container_detail::static_move_ptr<Object,boost::ptr_container_detail::clone_deleter<boost::ptr_container_detail::reversible_ptr_container<boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>,boost::heap_clone_allocator>::null_clone_allocator<false>>> 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\ptr_sequence_adapter.hpp(182) : see reference to class template instantiation 'boost::ptr_container_detail::move_ptrs::move_source<Ptr>' being compiled 1> with 1> [ 1> Ptr=boost::ptr_container_detail::static_move_ptr<Object,boost::ptr_container_detail::clone_deleter<boost::ptr_container_detail::reversible_ptr_container<boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>,boost::heap_clone_allocator>::null_clone_allocator<false>>> 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\ptr_sequence_adapter.hpp(179) : while compiling class template member function 'void boost::ptr_sequence_adapter<T,VoidPtrSeq,CloneAllocator>::push_back(Object *)' 1> with 1> [ 1> T=Object, 1> VoidPtrSeq=std::vector<void *,std::allocator<void *>>, 1> CloneAllocator=boost::heap_clone_allocator 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\ptr_vector.hpp(35) : see reference to class template instantiation 'boost::ptr_sequence_adapter<T,VoidPtrSeq,CloneAllocator>' being compiled 1> with 1> [ 1> T=Object, 1> VoidPtrSeq=std::vector<void *,std::allocator<void *>>, 1> CloneAllocator=boost::heap_clone_allocator 1> ] 1> c:\it\personal\collision\source\world.h(20) : see reference to class template instantiation 'boost::ptr_vector<T>' being compiled 1> with 1> [ 1> T=Object 1> ] 1>c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\reversible_ptr_container.hpp(245) : warning C4127: conditional expression is constant 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\reversible_ptr_container.hpp(244) : while compiling class template member function 'void boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>::enforce_null_policy(const Object *,const char *)' 1> with 1> [ 1> Config=boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>, 1> CloneAllocator=boost::heap_clone_allocator 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\ptr_sequence_adapter.hpp(132) : see reference to class template instantiation 'boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>' being compiled 1> with 1> [ 1> Config=boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>, 1> CloneAllocator=boost::heap_clone_allocator 1> ] 1>c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\reversible_ptr_container.hpp(247) : warning C4127: conditional expression is constant 1>c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\reversible_ptr_container.hpp(110) : warning C4127: conditional expression is constant 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\reversible_ptr_container.hpp(109) : while compiling class template member function 'void boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>::null_clone_allocator<allow_null_values>::deallocate_clone(const Object *)' 1> with 1> [ 1> Config=boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>, 1> CloneAllocator=boost::heap_clone_allocator, 1> allow_null_values=false 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\reversible_ptr_container.hpp(52) : see reference to class template instantiation 'boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>::null_clone_allocator<allow_null_values>' being compiled 1> with 1> [ 1> Config=boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>, 1> CloneAllocator=boost::heap_clone_allocator, 1> allow_null_values=false 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\static_move_ptr.hpp(85) : see reference to function template instantiation 'void boost::ptr_container_detail::clone_deleter<CloneAllocator>::operator ()<Object>(const T *) const' being compiled 1> with 1> [ 1> CloneAllocator=boost::ptr_container_detail::reversible_ptr_container<boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>,boost::heap_clone_allocator>::null_clone_allocator<false>, 1> T=Object 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\detail\static_move_ptr.hpp(85) : while compiling class template member function 'boost::ptr_container_detail::static_move_ptr<T,Deleter>::~static_move_ptr(void)' 1> with 1> [ 1> T=Object, 1> Deleter=boost::ptr_container_detail::clone_deleter<boost::ptr_container_detail::reversible_ptr_container<boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>,boost::heap_clone_allocator>::null_clone_allocator<false>> 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\ptr_sequence_adapter.hpp(182) : see reference to class template instantiation 'boost::ptr_container_detail::static_move_ptr<T,Deleter>' being compiled 1> with 1> [ 1> T=Object, 1> Deleter=boost::ptr_container_detail::clone_deleter<boost::ptr_container_detail::reversible_ptr_container<boost::ptr_container_detail::sequence_config<Object,std::vector<void *,std::allocator<void *>>>,boost::heap_clone_allocator>::null_clone_allocator<false>> 1> ] 1> c:\it\personal\collision\sdk\boost\boost\ptr_container\ptr_sequence_adapter.hpp(179) : while compiling class template member function 'void boost::ptr_sequence_adapter<T,VoidPtrSeq,CloneAllocator>::push_back(Object *)' 1> with 1> [ 1> T=Object, 1> VoidPtrSeq=std::vector<void *,std::allocator<void *>>, 1> CloneAllocator=boost::heap_clone_allocator 1> ]

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Header Placement
by David Abrahams 04 Dec '07

04 Dec '07

Robert, I would really appreciate it if you could answer this posting. Thanks. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com

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[1.35.0] Tickets, Milestone, Testing
by David Abrahams 04 Dec '07

04 Dec '07

http://svn.boost.org/trac/boost/query?status=new&status=assigned&status=reo… shows all the tickets that have been assigned to the 1.35.0 milestone. Does this list have any meaning? In other words, are we actually intending to address all of these problems for 1.35, and put off other tickets for 1.35.1 or 1.36.0? IMO getting this list sorted out and handling the tickets one-by-one is the most productive way to get us from here to a successful release of 1.35.0. That may mean a number of new tickets need to be added (probably at least one for each major failure we're seeing in http://engineering.meta-comm.com/boost-regression/1_34_1/developer/issues.h… and possibly others) and it will require part of the release team to triage the whole list of tickets assigned to 1.35.0 and make some decisions to put certain tickets off for later. Also, are we running complete tests on the release branch currently? I don't see any links to test results for that part of the repo. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com

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[serialization] Clearing Intel/Windows errors?
by Beman Dawes 04 Dec '07

04 Dec '07

A whole bunch of serialization tests are failing for Intel/Windows because of an apparent error in export.hpp. See below. What is the status of getting this fixed? ..\boost/serialization/export.hpp(131): error: redeclaration cannot add dllexport/dllimport to "boost::archive::detail::ptr_serialization_support<Archive, Serializable>::instantiate" (declared at line 131) BOOST_DLLEXPORT void ptr_serialization_support<Archive,Serializable>::instantiate() Thanks, --Beman

5 7

C++ Performance
by nisha kannookadan 04 Dec '07

04 Dec '07

Hi everybody Im a quite new boost user and I wonder, why C++ Program is so slow. I wrote a program, and I have the same program in Matlab, I expected that my C++ version is much faster, but its not. I use matrices, vectors, matrix- and vector proxies. Do some solving and compute calculations with prod, element_div, etc.. Is boost in general slower than matlab, should I use something else? Id be real happy about any help. Regards Nisha K _________________________________________________________________ Explore the seven wonders of the world http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE

9 19

An innocent mistake was nearly the end of me ;-)
by Paul A Bristow 04 Dec '07

04 Dec '07

I have been puzzled by the effect of my mistyping causing this message. i:\trunk\boost/range/const_iterator.hpp(37) : error C2039: 'const_iterator' : is not a member of 'std::ios_base' C:\Program Files\Microsoft Visual Studio 8\VC\include\xiosbase(183) : see declaration of 'std::ios_base' i:\trunk\boost/mpl/eval_if.hpp(63) : see reference to class template instantiation 'boost::range_const_iterator<C>' being compiled with [ C=std::ios_base ] i:\trunk\boost/range/iterator.hpp(63) : see reference to class template instantiation 'boost::mpl::eval_if_c<C,F1,F2>' being compiled with [ C=true, F1=boost::range_const_iterator<std::ios_base>, F2=boost::range_mutable_iterator<const std::ios_base> ] I:\Boost-sandbox\SOC\2007\visualization\boost/svg_plot/show_2d_settings.hpp(104) : see reference to class template instantiation 'boost::range_iterator<C>' being compiled with [ C=const std::ios_base ] i:\trunk\boost/range/const_iterator.hpp(37) : error C2146: syntax error : missing ';' before identifier 'type' i:\trunk\boost/range/const_iterator.hpp(37) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int i:\trunk\boost/range/const_iterator.hpp(37) : error C2208: 'boost::type' : no members defined using this type i:\trunk\boost/range/const_iterator.hpp(37) : fatal error C1903: unable to recover from previous error(s); stopping compilation The "erroneous" line 37 is: template< typename C > struct range_const_iterator { typedef BOOST_DEDUCED_TYPENAME C::const_iterator type; }; And this left me in total disambiguation mode :-) The cause was simple - I typed ">> end;" when I wanted ">> endl;" In mitigation I would point out that I got the other 120 endl;'s right ;-) The compiler, lack an ounce of sense, interpreted this to the letter. I suspect I may not be first or last person to do this :-) Could the source file usefully have a comment that says something like " If you get a error "'const_iterator' : is not a member of 'std::ios_base'" here have you typed "end;" somewhere instead of "endl;" " ? Paul --- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539561830 & SMS, Mobile +44 7714 330204 & SMS pbristow(a)hetp.u-net.com --- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539561830 & SMS, Mobile +44 7714 330204 & SMS pbristow(a)hetp.u-net.com

2 1

units: need limits
by Noah Roberts 03 Dec '07

03 Dec '07

std::numeric_limits needs to be implemented for quantity. I think this should work: namespace std { template< typename T, typename U > class numeric_limits< boost::units::quantity<U, T> > : public numeric_limits<T> { typedef numeric_limits<T> type_limits; typedef boost::units::quantity<U, T> qty; public: static qty denorm_min() { return qty(type_limits::denorm_min() * U()); } static qty epsilon() { return qty(type_limits::epsilon() * U()); } static qty infinity() { return qty(type_limits::infinity() * U()); } static qty max() { return qty(type_limits::max() * U()); } static qty min() { return qty(type_limits::min() * U()); } static qty round_error() { return qty(type_limits::round_error() * U()); } static qty quiet_NaN() { return qty(type_limits::quiet_NaN() * U()); } static qty signalizing_NaN() { return qty(type_limits::signaling_NaN() * U()); } }; }

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