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Quaternions and SLERP
by Yves Rogez 13 Oct '11

13 Oct '11

Hello, I'm currently searching for a BLAS and geometrical library in C++ for ray-tracing simulation. I would like to know if Boost provides an implementation of the SLERP (Spherical Linear Interpolation) with Quaternions. As far as I could read in the Boost::Quaternions docs, it is not integrated, maybe it is elsewhere in boost ? I also found QVM which is not integrated with boost but extensively uses it. Is that in your mind a reliable solution ? (I have to compute a huge set of quaternion interpolations and compositions during my simulation steps). Thanks in advance for your replies, Regards, Yves

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Boost asio deadline_timer, bug?
by Allan Nielsen 13 Oct '11

13 Oct '11

Hi Is this a bug, or am I doing something wrong? #include <iostream> #include <boost/asio.hpp> #include <boost/bind.hpp> using namespace std; using namespace boost::asio; struct A { A(io_service & service) : timer1(service), timer2(service) { timer1.expires_from_now( boost::posix_time::seconds(5) ); timer1.async_wait(boost::bind(&A::handler, this, _1)); timer2.expires_from_now( boost::posix_time::seconds(2) ); timer2.async_wait(boost::bind(&A::interrupt, this, _1)); } void handler(const boost::system::error_code &ec) { cout << "Forbidden handler" << endl; assert(0); } void handler_interrupted(const boost::system::error_code &ec) { cout << "Hello world" << endl; } void interrupt(const boost::system::error_code &ec) { cout << "Interrupted" << endl; int res = timer1.cancel(); assert(res > 0); timer1.expires_from_now( boost::posix_time::milliseconds(0) ); timer1.async_wait(boost::bind(&A::handler_interrupted, this, _1)); } int count, max, timeout1, timeout2; deadline_timer timer1; deadline_timer timer2; }; int main() { io_service service; A a(service); service.run(); return 0; }

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[Accumulators] Calling extractors on empty accumulator_set
by Dylan Klomparens 12 Oct '11

12 Oct '11

Hello all, I am curious, what mean is obtained from this code snippet? boost::accumulators::accumulator_set<int, boost::accumulators::features<boost::accumulators::tag::mean> > Accumulator; int Mean = boost::accumulators::mean(Accumulator); It appears to be non-zero when I test it. Is there some way I can tell that the average was taken for an empty data set? I was looking around in the documentation for the accumulator library, but was unable to find an answer to this question. Thanks in advance! -- Dylan

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using numpy instead of numeric
by Leila Baghdadi 12 Oct '11

12 Oct '11

Hello, I am very new to boost, I had a few files which build and run fine with boost , but return a numeric array, I now need to change my code to return a numpy array as I am sending it in another python package for further processing, I have been searching the web trying to find a simple example to do this conversion but so far was unsuccessful, The sample of my code is attached, any help is greatly appreciated! Leila

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boost::iterator_facade and assignment operation
by Arun Ramasamy 12 Oct '11

12 Oct '11

HI, I'm using the boost iterator_facade class to implement a random access iterator for my class. When I try to assign the iterators to one another, the compiler fails saying 'operator =' function is unavailable". Sample code from my implementation below: |class MyClass{ class Iterator : public boost::iterator_facade<Iterator, T, boost::bidirectional_traversal_tag>{ protected: void increment(); bool equal(const Iterator& rhs)const; //etc || //... Note - no method implemented to support assignment | | } }| I'd assumed that it'll be possible to assign iterators to each other. Why is the assignment operator not supported by iterator_facade. It implements other operations (like ++ and ==)by making the derived version implement private methods (like increment and equal). Am I missing something. The boost documentation doesn't mention why this is not supported. Thanks AR

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Does Boost suit me?
by Nouf M. 12 Oct '11

12 Oct '11

Hello, I'm a phd student. I'm working in the graph mining field. I have a huge text file that I would like to convert to a graph. Then, I will write some code to implement my algorithm (something similar to shortest paths algorithms). I'm planning to write my code in C++. Do you think Boost will suit me? Best regards, Nouf

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Re: [Boost-users] Compiling version 1.43 of boost/graph with SunCC 5.8
by Rob Riggs 12 Oct '11

12 Oct '11

You won't get far with that compiler. Your only hope is SS12 (CC 5.10), but even that's a stretch. The Solaris compiler was not exactly standard compliant. Rob Renaud Kauffmann <renaud(a)ekauffmann.net> wrote: >#include <boost/graph/adjacency_list.hpp> > >using namespace boost; > >typedef adjacency_list <vecS, vecS, undirectedS> BoostGraph; >typedef graph_traits < BoostGraph >::vertex_descriptor vertex_t; > >int main() { > > BoostGraph g; > vertex_t v1 = add_vertex(g); > vertex_t v2 = add_vertex(g); > vertex_t v3 = add_vertex(g); > > return 0; >} > >The above code doesn't seem to compile with Sun Studio 11, that is Sun C++ >compiler 5.8 and boost 1.43 >Here is the error: > >"/home/renaudk/boost/boost_1_43_0/boost/unordered/detail/table.hpp", line >38: Error: Could not find a match for >boost::unordered_detail::hash_table<boost::unordered_detail::T>::find_iterator<boost::unordered_detail::hash_table<boost::unordered_detail::T>::Key, >boost::unordered_detail::hash_table<boost::unordered_detail::T>::Pred>(bucket_ptr, >const boost::unordered_detail::Key&, const boost::unordered_detail::Pred&) >const. >"/home/renaudk/boost/boost_1_43_0/boost/unordered/detail/table.hpp", line >38: Error: Too many args in template, from boost::unordered_detail::Pred on >ignored. >"/home/renaudk/boost/boost_1_43_0/boost/unordered/detail/table.hpp", line >595: Error: Could not find a match for >boost::unordered_detail::hash_table<boost::unordered_detail::T>::find(const >boost::unordered_detail::Key&, const boost::unordered_detail::Hash&, const >boost::unordered_detail::Pred&) const. >"/home/renaudk/boost/boost_1_43_0/boost/unordered/detail/table.hpp", line >595: Error: Too many args in template, from boost::unordered_detail::Hash on >ignored. >4 Error(s) detected. > >I have tried some of the switch I found in the forums such as >-library=stlport4 >-features=tmplife -features=tmplrefstatic > >But no luck. > >Does anybody know the trick ? > >Thanks. > >_______________________________________________ >Boost-users mailing list >Boost-users(a)lists.boost.org >http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Anyone using boost.MPI with latest MPICH2 stuff
by Jonathan Bishop 12 Oct '11

12 Oct '11

Linked with MPICH2 1.4.1p1 but got some run time errors. Is anyone actively doing this? Thanks, Jon

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Re: [Boost-users] [serialization] serialization of a class as pointer and non-pointer
by Daniela Lambertz 11 Oct '11

11 Oct '11

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[serialization] serialization of a class as pointer and non-pointer
by Daniela Lambertz 11 Oct '11

11 Oct '11

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