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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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Link Boost::Python statically
by Marcin Simonides 25 Feb '09

25 Feb '09

Hello, I'm trying to link my Python extension module with static version of Boost::Python library. According to documentation, the auto_link facility should by default supply the library for static linking (libboost_python-vc80-mt-gd-1_38.lib in my case). Unfortunately it doesn't work that way for me - I get the import lib by default and have to supply boost_python dll. If I specifically provide the statically linked lib to the linker I get errors that symbols are defined multiple times by both the static library and the import library. I was able to link statically by: - defining BOOST_ALL_NO_LIB, - defining BOOST_PYTHON_STATIC_LIB, - adding libboost_python-vc80-mt-gd-1_38.lib to link libraries. While this worked I have a strong feeling that it's not the way it was meant to be. I'm using Visual Studio 2005 to compile my project (it's a Win32 DLL project), I'm using Boost 1.38 that I have compiled with bjam (which probably isn't relevant). All boost's *.lib files are in the same directory so they should be all accessible to the linker. I'm not aware of any BOOST_*_DYN_LINK being set (I have never set any Boost related defines other than the above. If you have any tips on how to verify that, I'd be grateful). Could you help me with this problem? Is there anything I should check that would cause the DLL to be used by default? -- Marcin Simonides

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

25 Feb '09

Hi, I cannot resolve why boost::mem_fn does not appear to be able to resolve to a pointer (or a reference) from a smart pointer to a derived object (My understanding is that get_pointer in boost::shared_ptr is specifically available so that boost::mem_fn can work) Here is the example of code and line with error (Visual Studion 2008 32 bit) Thank you in advance for any help ---------------------------------------------- #include <iostream> #include <boost/shared_ptr.hpp> #include <boost/mem_fn.hpp> #include <boost/lexical_cast.hpp> #include <boost/utility.hpp> #include <boost/enable_shared_from_this.hpp> #include <vector> using namespace boost; using namespace std; struct A: public enable_shared_from_this<A> { static void myfunc(const A* in) { } }; struct B: public A, public enable_shared_from_this<B> { typedef shared_ptr<B> tBptr; }; int main (void) { vector<B::tBptr> v; B::tBptr p(new B()); v.push_back(p); p.reset(new B()); v.push_back(p); //error cannot deduce argument for_each (v.begin(),v.end(), boost::mem_fn(&A::myfunc)); return 0; } -- V S P toreason(a)fastmail.fm -- http://www.fastmail.fm - A fast, anti-spam email service.

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problem with boost regex search
by Guy LaCrosse 25 Feb '09

25 Feb '09

hello, When I enter the following reg-ex: "^.*ab+c+d+" for the following text: "aaaabbbcccdddee" the text found is:"aaaabbbcccd". The text found should be: "aaaabbbcccddd". Digging deeper, its seems that the reg-ex function ignores the last character if it is a "+". This is just using boost::regex_search with the flags = boost::match_any and boost::match_not_null Am I missing something here?

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circular_buffer_space_optimized possible bug
by Birju Prajapati 24 Feb '09

24 Feb '09

Hi, When I run the following code: int main() { boost::circular_buffer_space_optimized<int> buf; std::cout << buf.size() << std::endl; buf.push_back(1); std::cout << buf.size() << std::endl; } I get the output 0 0 Is this a bug? This is boost 1.38, gcc 4.3.2 It works fine with boost 1.35, gcc 4.1.2 (gives the output 0,1) TIA Birju Schneider Trading 4th Floor, 25 Copthall Avenue London EC2R 7BP -------------------------------------------------------- Message from: Birju.Prajapati(a)schneidertrading.com Message to: boost-users(a)lists.boost.org Attached files: 0 This e-mail and any files transmitted with it are confidential, may be legally privileged, and are for the sole use of the intended recipient. Copyright in this e-mail and any accompanying document created by us is owned by us. If you are not the intended recipient of this e-mail or any part of it please telephone our IT Department at the number shown above or by e-mail at info(a)schneidertrading.com. You should not use or disclose to any other person the contents of this e-mail or its attachments (if any), nor take copies. This e-mail is not a representation or warranty and is not intended nor should it be taken to create any legal relations, contractual or otherwise. Schneider Trading Associates Ltd (Registration No. 3692131) is incorporated in England and Wales and the registered office is at 25 Copthall Avenue, London EC2R 7BP. The company is authorised and regulated by the Financial Services Authority

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How to access each elements of a thread group separately
by Johan Mazel 24 Feb '09

24 Feb '09

Hi I'm using several threads to do some parallel work. But I need to stop them separatly through the interrupt method. In order to store all these threads, I thought that I would use the thread_group class since I cannot use the vector class. But it looks like I cannot acces an element of a thread group (to interrupt it separately for example). Is there anyway of doing this that I'm not aware of ? Thanks in adavnace for the help. Johan Mazel

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boost::serialization - track_never, load and save in cpp file?
by Martin Trappel 24 Feb '09

24 Feb '09

Hi. To support the serialization of a class I don't want to change anything, I have added free save and load function. (See the test code below.) It compiles and appears to work. I have the following questions: * Is it OK to put the save & load definitions in a separate implementation file? * Is it OK to specify track_never in a cpp file? Will this cause problems if someone else tries to serialize a map<int, string> ? thanks! - Martin - global_serialization.h - // ... class MyComplexClass; // ... namespace boost { namespace serialization { // Declare save and load for MyComplexClass template<class Archive> void save(Archive & ar, const MyComplexClass& t, unsigned int version); template<class Archive> void load(Archive & ar, MyComplexClass& t, unsigned int version); } } // Split: BOOST_SERIALIZATION_SPLIT_FREE(MyComplexClass); ***** - complex_class_serialization.cpp - // ... #include "ComplexClass.h" // ... typedef std::map<int, std::string ser_map_t; BOOST_CLASS_TRACKING(ser_map_t, boost::serialization::track_never); namespace boost { namespace serialization { template<class Archive> void save(Archive & ar, const MyComplexClass& t, unsigned int version) { // the relevant information to be serialized for // instances of MyComplexClass can be represented // by a map<int, string> ser_map_t m; // ... fill m object from t object ar << m; // Serialize } template<class Archive> void load(Archive & ar, CBoxHandler & t, unsigned int version) { ser_map_t m; ar >> m; // ... init t object from m } } // namespace serialization } // namespace boost

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[mpl & type_traits]
by Robert Jones 24 Feb '09

24 Feb '09

Simple questions from a metaprogramming newbie... Why do we have mpl::true_ and true_type? Are they interchangable? Is is_same the same as mpl::equal? Thanks, Rob.

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