February 2009 - Boost-users - lists.preview.boost.org

symbian port?
by Gustavo Garcia Bernardo 25 Feb '09

25 Feb '09

Is it possible to build boost libraries for the symbian platform? Thank you, G.

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[boost-users][StateChart] event creation/destruction
by Igor R 25 Feb '09

25 Feb '09

Hello, In my application I use a few async state-machines with lots of events. I'd like to trace some events construction/destruction balance, so I define them as follows: volatile long eventCount; template<class MostDerived> struct EvBase : sc::event<MostDerived> { EvBase() { long c = InterlockedIncrement(&eventCount); somelog << c << std::endl; } ~EvBase() { long c = InterlockedDecrement(&eventCount); somelog << c << std::endl; } }; // inherit EvBase directly struct Ev1 : EvBase<Ev1> {}; struct Ev2 : EvBase<Ev2> {}; struct Ev3 : EvBase<Ev3> {}; // inherit EvBase indirectly template<class MostDerived> struct EvIntermediate : EvBase<MostDerived> {}; struct Ev4 : EvIntermediate<Ev4> {}; When I run the application, I see that at some stage the counter goes negative, and its tendency is to get more and more negative. I guess I don't realize something important about the sc::event, so I'd appreciate enlightment on this. Thanks, Igor'.

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Re: [Boost-users] [accumulators] Strange behavior while extracting min using UDT
by dhruva 25 Feb '09

25 Feb '09

Hello, I found the solution. I had to specialize the min and max as follows for my UDT. It now works as it always did :) acc_sample std::numeric_limits<acc_sample>::min() { return (acc_sample(1000, std::numeric_limits<double>::min())); } acc_sample std::numeric_limits<acc_sample>::max() { return (acc_sample(1000, std::numeric_limits<double>::max())); } -dhruva From Chandigarh to Chennai - find friends all over India. Go to http://in.promos.yahoo.com/groups/citygroups/

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[accumulators] Strange behavior while extracting min using UDT
by dhruva 25 Feb '09

25 Feb '09

Hi, The following code when compiled by defining UDT will use a UDT as Sample (without the define, will use double). Some part of code is creating an object (when UDT) is used as acc_sample(0) and that is shown in min. In the following example, I am adding 3 samples and the count confirms that. However, on extracting the min, I get a value that I have not added (and this is created by the following call stack on windows XP using MSVC 2005) ntdll.dll!_DbgBreakPoint@0() acc.exe!acc_sample::acc_sample(double v=0.00000000000000000) Line 35 C++ > acc.exe!std::numeric_limits<acc_sample>::max() Line 109 + 0x10 bytes C++ acc.exe!boost::numeric::functional::as_max_base<acc_sample const ,void>::operator()(const acc_sample & __formal={...}) Line 302 + 0x9 bytes C++ acc.exe!boost::detail::function1<boost::numeric::functional::as_max<boost::mpl::arg<-1>,boost::numeric::functional::tag<boost::mpl::arg<-1> > > >::operator()<acc_sample>(const acc_sample & a0={...}) Line 69 + 0x10 bytes C++ acc.exe!boost::accumulators::impl::min_impl<acc_sample>::min_impl<acc_sample><boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> >(const boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> & args={...}) Line 38 C++ acc.exe!boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min>::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min><boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> >(const boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> & args={...}) Line 284 C++ acc.exe!boost::accumulators::detail::build_acc_list<boost::fusion::mpl_iterator<boost::mpl::v_iter<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,1> >,boost::fusion::mpl_iterator<boost::mpl::v_iter<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,2> >,0>::call<boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> >(const boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> & args={...}, const boost::fusion::mpl_iterator<boost::mpl::v_iter<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,1> > & f={...}, const boost::fusion::mpl_iterator<boost::mpl::v_iter<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,2> > & l={...}) Line 215 + 0xc bytes C++ acc.exe!boost::accumulators::detail::build_acc_list<boost::fusion::mpl_iterator<boost::mpl::v_iter<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,0> >,boost::fusion::mpl_iterator<boost::mpl::v_iter<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,2> >,0>::call<boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> >(const boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> & args={...}, const boost::fusion::mpl_iterator<boost::mpl::v_iter<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,0> > & f={...}, const boost::fusion::mpl_iterator<boost::mpl::v_iter<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,2> > & l={...}) Line 215 + 0x2e bytes C++ acc.exe!boost::accumulators::detail::make_acc_list<boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> >,boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> >(const boost::mpl::vector2<boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::count_impl,boost::accumulators::tag::count>,boost::accumulators::detail::accumulator_wrapper<boost::accumulators::impl::min_impl<acc_sample>,boost::accumulators::tag::min> > & seq={...}, const boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator,boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void> >,boost::parameter::aux::empty_arg_list> & args={...}) Line 234 + 0x2f bytes C++ acc.exe!boost::accumulators::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void>::accumulator_set<acc_sample,boost::accumulators::features<boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumulators::tag::min,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na,boost::mpl::na>,void>() Line 146 + 0x31 bytes C++ acc.exe!main(int argc=1, char * * argv=0x00033b18) Line 96 C++ acc.exe!__tmainCRTStartup() Line 327 + 0x12 bytes C kernel32.dll!_BaseProcessStart@4() + 0x23 bytes // Sample code starts #include <stdio.h> #include <iostream> #include <vector> #include <boost/accumulators/accumulators.hpp> #include <boost/accumulators/statistics/stats.hpp> #include <boost/accumulators/statistics/count.hpp> #include <boost/accumulators/statistics/min.hpp> #include <boost/accumulators/statistics/max.hpp> using namespace std; namespace bacc = boost::accumulators; using namespace bacc; typedef struct { size_t _time; double _value; } time_val_t; /* Wrapper class as I cannot modify time_val_t */ class acc_sample { public: time_val_t _data; acc_sample() { _data._time = 0; _data._value = 0.0; } /* This should never get called: limits is creating an object with 0 * and this object gets extracted as min */ acc_sample(double v) { abort(); } acc_sample(time_t t, double v) { _data._time = t; _data._value = v; } acc_sample(const time_val_t &i) { _data._time = i._time; _data._value = i._value; } acc_sample(const acc_sample &i) { _data._time = i._data._time; _data._value = i._data._value; } bool operator < (const acc_sample &rhs) const { return _data._value < rhs._data._value; } bool operator > (const acc_sample &rhs) const { return _data._value > rhs._data._value; } bool operator == (const acc_sample &rhs) const { return _data._value == rhs._data._value; } bool operator != (const acc_sample &rhs) const { return _data._value != rhs._data._value; } }; int main(int argc, char *argv[]) { #ifdef UDT typedef acc_sample sample_type; sample_type s1(10, 100); sample_type s2(11, 101); sample_type s3(12, 102); sample_type res; #else typedef int sample_type; sample_type s1 = 100; sample_type s2 = 101; sample_type s3 = 102; sample_type res; #endif #if 0 if (s1 == s1) cout << "==" << endl; if (s1 < s2) cout << "<" << endl; if (s2 > s1) cout << ">" << endl; #endif accumulator_set< sample_type, features< tag::count, tag::max, tag::min > > acc; acc(s1); acc(s2); acc(s3); size_t sz = extract_result< tag::count >(acc); cout << "Count:" << sz << endl; res = extract_result< tag::max >(acc); #ifdef UDT cout << "Max: [" << res._data._time << "," << res._data._value << "]" << endl; #else cout << "Max: [" << res << "]" << endl; #endif res = extract_result< tag::min >(acc); #ifdef UDT cout << "Min: [" << res._data._time << "," << res._data._value << "]" << endl; #else cout << "Min: [" << res << "]" << endl; #endif return 0; } // Sample code ends Looking for any help or leads would be of real help. regards, -dhruva Check out the all-new Messenger 9.0! Go to http://in.messenger.yahoo.com/

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[Newbie] How to create a class member thread
by Daniele Barzotti 25 Feb '09

25 Feb '09

Hi, I'm sure the question is very banal... I have a thread object stored in a class: class MyClass { private: void Init(); boost::thread _thread; } How can I create it in the implementation code? MyClass::Init() { // start thread here... } Tnx. Daniele.

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[interprocess] and mixed endianness trouble
by Ivan Kharin 25 Feb '09

25 Feb '09

My software is a plug-in for Photoshop compatible image editors. For some reasons (third-party lib problems with re-initialize in same process) software was splitted to "Thunk" (loaded into host process) and "Main" (started as separated process) modules. Last days I was busy trying to replace socket-based data exchange with boost.interprocess And encountered a BIG PROBLEM: Non-universal binary host runs under PowerPC-emulation (as well as my universal-binary "Thunk"), but "Main" executes x86 code. Two different processors -- x86 and emulated PowerPC -- have access to interprocess_* private uint32_t's, treating memory as MSB (PowerPC) and LSB (x86) simultaneously. Any ideas? -- Ivan Kharin

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[Q] shared_ptr less than operator for std::set
by V S P 25 Feb '09

25 Feb '09

I am trying to use shared_ptr in std::set and std::vector. For std::set I was expecting that when I define a less than comparasing operation in my class (wrapped by shared ptr) -- it would actually get invoked. Instead I think it is the less than of the shared_ptr that is being invoked So I do not get the ordering I expect in my std::set container. Therefore wanted to ask -- how can it be done, that the operator.< of my class and not the shared_ptr's is being used by std::set I searched for posting on this subject but did not come up with the solution. Only discussions about the details of pointer comparasing http://aspn.activestate.com/ASPN/Mail/Message/boost/1863117 VSP -- V S P toreason(a)fastmail.fm -- http://www.fastmail.fm - Same, same, but different...

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[accumulators] Help required for using UDT as Sample
by dhruva 25 Feb '09

25 Feb '09

Hi, I am using boost::accumulator for finding min (among other things). It works fine when I use a POD as Sample. ex: accumulator_set< double, features <tag::min> > acc; acc(1.0); acc(5.0); .... I have my own data type, time stamp and value. I would like to get the min Sample with corresponding time stamp. class time_val { public: time_t _time; double _value; /* I have overloaded operators: <, >, ==, != */ /* Have provided copy constructor */ }; When I try: accumulator_set< time_val, features <tag::min> > acc; I get a whole lot of compilation errors. Is there any way I can make a UDT as a sample? regards, -dhruva Bollywood news, movie reviews, film trailers and more! Go to http://in.movies.yahoo.com/

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Bulding Boost.Python on OSX
by Z. S. O. 25 Feb '09

25 Feb '09

Forgive me, but it doesn't look like the specific Boost.Python list is active so I'm posting this here. I followed the relevant directions and built Boost.Python on my Mac using bjam, which gave the following output: ...patience... ...patience... ...found 1356 targets... ...updating 54 targets... <snip> ...failed updating 1 target... ...skipped 6 targets... ...updated 47 targets... I now see embedding.o and extending.o in the bin/gcc-4.01/debug directory within the quickstart directory. But when I run test_extending.py, the script fails and gives "ImportError: No module named extending". How do I get the python script to import the extending module? Thank you for your time.

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Re: [Boost-users] [Q] error with shared_ptr, for_each, boost::mem_fn
by V S P 25 Feb '09

25 Feb '09

Ok, I apologize I misunderstood the suggestion I made the function as non static member, but kept the input argument. If I make myfunc to take void, then it works. I would like to know if there any way to use static member functions with the for_each sematic and shared_ptr thank you, Vlad On Tue, 24 Feb 2009 21:04 -0500, boost-users(a)lists.boost.org wrote: > Hi, thank you for such a quick reply > > I have tried the member function, getting different type of error now > class B; > struct A : public enable_shared_from_this<A> > { > void myfunc(const A* in) > {} > }; > ------------------------------------------------ > sharedptr.cpp > C:\usr\local\MSVS9.0\VC\INCLUDE\algorithm(29) : error C2064: term does > not evalu > ate to a function taking 1 arguments > class does not define an 'operator()' or a user defined > conversion opera > tor to a pointer-to-function or reference-to-function that takes > appropriate num > ber of arguments > sharedptr.cpp(38) : see reference to function template > instantiation '_F > n1 > std::for_each<std::_Vector_iterator<_Ty,_Alloc>,boost::_mfi::mf1<R,T,A1>>(_In > It,_InIt,_Fn1)' being compiled > with > [ > _Fn1=boost::_mfi::mf1<void,A,const A *>, > _Ty=B::tBptr, > _Alloc=std::allocator<B::tBptr>, > R=void, > T=A, > A1=const A *, > _InIt=std::_Vector_iterator<B::tBptr,std::allocator<B::tBptr>> > ] > > --------------------------------------------- > > Also, is there a way to get the for_each and shared_ptr to work with > static member functions? > I tried std::ptr_fun but that one also has a problem that does not > even try to call the > shared_ptr::get_pointer > > I also tried to enabled BOOST_MEM_FN_ENABLE_CDECL (which is what I use > for the project) -- that did not help. > I tried even just having myfunc take const shared_ptr<A> or > shared_ptr<B> -- that did not work either. > > > > > thank you again for your help, > Vlad > > > > > > On Tue, 24 Feb 2009 17:42 -0800, "Steven Watanabe" > <watanabesj(a)gmail.com> wrote: > > AMDG > > > > V S P wrote: > > > struct A: public enable_shared_from_this<A> > > > { > > > static void myfunc(const A* in); > > > }; > > > > > > for_each (v.begin(),v.end(), boost::mem_fn(&A::myfunc)); > > > > > > > A::myfunc is a static member function, so mem_fn doesn't work. > > If you declare it as a non-static member > > void myfunc() const; > > it works. > > > > In Christ, > > Steven Watanabe > > > > _______________________________________________ > > Boost-users mailing list > > Boost-users(a)lists.boost.org > > http://lists.boost.org/mailman/listinfo.cgi/boost-users > -- > V S P > toreason(a)fastmail.fm > > -- > http://www.fastmail.fm - mmm... Fastmail... > -- V S P toreason(a)fastmail.fm -- http://www.fastmail.fm - Accessible with your email software or over the web

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