April 2012 - Boost-users - lists.preview.boost.org

Does io_service::post() block while io_service is busy?
by Andreas Wehrmann 13 Apr '12

13 Apr '12

I have a question about the behaviour of asio::io_service when it comes to executing previously posted work while trying to post even more work. I have two threads, one of which is the worker thread that runs io_service::run() and the other one that runs with a high priority and uses io_service::post() to relay processing of incoming requests via network to the worker thread (this has to be fast). The question is: When the worker thread is currently executing work (of which there may be a lot) which the high priority thread previously posted to it, is the io_service locked?; so that calls to io_service::post() block until the io_service is done? I came to this question because I saw that in ::post() there is a lock involved protecting access to the operations queue. Regards, Andreas -- Dipl.-Ing. (FH) Andreas Wehrmann Software Development -------------------------------------------------------------- Center Communication Systems GmbH A-1210 Wien, Ignaz-Köck-Straße 19 Sitz in Wien FN 796 88p, Firmenbuchgericht Wien www.centersystems.com Tel.: +43 (0) 190 199 - 3616 Mobile: +43 (0) 664 884 75916 Fax: +43 (0) 190 199 - 2110 E-Mail: a.wehrmann(a)centersystems.com

2 1

Is thread pool using asio and thread_group working as intended?
by Jonas Nilsson 13 Apr '12

13 Apr '12

Hello, I have found several sites illustrating the use of boost:asio::io_service together with boost::thread_group to create a simple thread pool system. I put together my own minimum example to test it: asio::io_service io_service; asio::io_service::work work(io_service); boost::thread_group threads; for (std::size_t i = 0; i < running_threads; ++i) { threads.create_thread(boost::bind(&asio::io_service::run, &io_service)); } for (int u = 0; u < work_units; u++) { io_service.post(boost::bind(WorkFunc, u)); } io_service.stop(); threads.join_all(); When running the code, I find that all worker threads are killed when the following line is executed: io_service.stop();. Does the code work as intended? My impression from the comments to the examples I have seen is that it does not work as intended on my system. If the code does work as intended, is there a simple non polling method to determine when all work units are completed? /Jonas

2 1

[boost lambda bind] overloading not compiling
by Kaz 13 Apr '12

13 Apr '12

Hi All, I came across this strange error. Binding of overloaded member functions works with boost bind, but not with boost lambda bind. Here is the example Following builds and works fine #include "boost/function.hpp" #include "boost/bind.hpp" class Operations { public: void Fun1( int i ){ std::cout<<"\nfunction with one arg\n"; } void Fun1( int i, double d) {std::cout<<"\nfunction with two args\n"; } }; ----------------------- int main() { Operations op; typedef boost::function <void () > fptr; fptr func1 = boost::bind( &Operations::Fun1, &op,1); fptr func2 = boost::bind( &Operations::Fun1, &op, 1, 2.2 ); return 0; } ------------------------ While following Does not compile int main() { using namespace boost::lambda; Operations op; typedef boost::function <void () > fptr; fptr func1 = bind( &Operations::Fun1, &op,1); fptr func2 = bind( &Operations::Fun1, &op, 1, 2.2 ); return 0 } ------------------------- This spits out massive error, as shown below. I think gist of which is it can't figure out which function to instantiate, when using lambda bind. Can some body please point out what am I missing here ? (Sorry for long email, I didn't wanted to clutter the email with this error message, bu thought most of you will figure it out just from looking at it.). Any help will be appreciated, and thanks in advance. Kaz boostFunctionAndBind.cpp: In function ‘int main()’: boostFunctionAndBind.cpp:61:45: error: no matching function for call to ‘bind(<unresolved overloaded function type>, Operations*, int)’ boostFunctionAndBind.cpp:61:45: note: candidates are: /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:49:1: note: template<class Result> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<1, boost::lambda::function_action<1, T> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)()>::type> > boost::lambda::bind(Result (&)()) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:71:1: note: template<class Arg1> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<1, boost::lambda::function_action<1> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1>::type> > boost::lambda::bind(const Arg1&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:91:1: note: template<class Result, class Arg1> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<1, boost::lambda::function_action<1, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1>::type> > boost::lambda::bind(const Arg1&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:190:1: note: template<class Result, class Par1, class Arg2> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1), const Arg2>::type> > boost::lambda::bind(Result (&)(Par1), const Arg2&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:212:1: note: template<class Arg1, class Arg2> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2>::type> > boost::lambda::bind(const Arg1&, const Arg2&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:232:1: note: template<class Result, class Arg1, class Arg2> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2>::type> > boost::lambda::bind(const Arg1&, const Arg2&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:333:1: note: template<class Result, class Par1, class Par2, class Arg2, class Arg3> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2), const Arg2, const Arg3>::type> > boost::lambda::bind(Result (&)(Par1, Par2), const Arg2&, const Arg3&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:361:1: note: template<class Arg1, class Arg2, class Arg3> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:387:1: note: template<class Result, class Arg1, class Arg2, class Arg3> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:503:1: note: template<class Result, class Par1, class Par2, class Par3, class Arg2, class Arg3, class Arg4> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<4, boost::lambda::function_action<4, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3), const Arg2, const Arg3, const Arg4>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3), const Arg2&, const Arg3&, const Arg4&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:532:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<4, boost::lambda::function_action<4> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:558:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<4, boost::lambda::function_action<4, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:679:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Arg2, class Arg3, class Arg4, class Arg5> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<5, boost::lambda::function_action<5, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4), const Arg2, const Arg3, const Arg4, const Arg5>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4), const Arg2&, const Arg3&, const Arg4&, const Arg5&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:710:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<5, boost::lambda::function_action<5> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:738:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<5, boost::lambda::function_action<5, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:867:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<6, boost::lambda::function_action<6, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:899:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<6, boost::lambda::function_action<6> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:927:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<6, boost::lambda::function_action<6, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1058:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Par6, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<7, boost::lambda::function_action<7, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5, Par6), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5, Par6), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1092:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<7, boost::lambda::function_action<7> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1123:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<7, boost::lambda::function_action<7, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1257:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Par6, class Par7, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<8, boost::lambda::function_action<8, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1291:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<8, boost::lambda::function_action<8> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1322:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<8, boost::lambda::function_action<8, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1458:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Par6, class Par7, class Par8, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<9, boost::lambda::function_action<9, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7, Par8), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7, Par8), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1494:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<9, boost::lambda::function_action<9> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1526:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<9, boost::lambda::function_action<9, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1673:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Par6, class Par7, class Par8, class Par9, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9, class Arg10> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<10, boost::lambda::function_action<10, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7, Par8, Par9), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9, const Arg10>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7, Par8, Par9), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&, const Arg10&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1710:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9, class Arg10> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<10, boost::lambda::function_action<10> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9, const Arg10>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&, const Arg10&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1743:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9, class Arg10> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<10, boost::lambda::function_action<10, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9, const Arg10>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&, const Arg10&) boostFunctionAndBind.cpp:62:52: error: no matching function for call to ‘bind(<unresolved overloaded function type>, Operations*, int, double)’ boostFunctionAndBind.cpp:62:52: note: candidates are: /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:49:1: note: template<class Result> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<1, boost::lambda::function_action<1, T> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)()>::type> > boost::lambda::bind(Result (&)()) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:71:1: note: template<class Arg1> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<1, boost::lambda::function_action<1> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1>::type> > boost::lambda::bind(const Arg1&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:91:1: note: template<class Result, class Arg1> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<1, boost::lambda::function_action<1, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1>::type> > boost::lambda::bind(const Arg1&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:190:1: note: template<class Result, class Par1, class Arg2> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1), const Arg2>::type> > boost::lambda::bind(Result (&)(Par1), const Arg2&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:212:1: note: template<class Arg1, class Arg2> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2>::type> > boost::lambda::bind(const Arg1&, const Arg2&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:232:1: note: template<class Result, class Arg1, class Arg2> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2, boost::lambda::function_action<2, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2>::type> > boost::lambda::bind(const Arg1&, const Arg2&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:333:1: note: template<class Result, class Par1, class Par2, class Arg2, class Arg3> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2), const Arg2, const Arg3>::type> > boost::lambda::bind(Result (&)(Par1, Par2), const Arg2&, const Arg3&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:361:1: note: template<class Arg1, class Arg2, class Arg3> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:387:1: note: template<class Result, class Arg1, class Arg2, class Arg3> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3, boost::lambda::function_action<3, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:503:1: note: template<class Result, class Par1, class Par2, class Par3, class Arg2, class Arg3, class Arg4> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<4, boost::lambda::function_action<4, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3), const Arg2, const Arg3, const Arg4>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3), const Arg2&, const Arg3&, const Arg4&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:532:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<4, boost::lambda::function_action<4> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:558:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<4, boost::lambda::function_action<4, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:679:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Arg2, class Arg3, class Arg4, class Arg5> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<5, boost::lambda::function_action<5, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4), const Arg2, const Arg3, const Arg4, const Arg5>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4), const Arg2&, const Arg3&, const Arg4&, const Arg5&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:710:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<5, boost::lambda::function_action<5> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:738:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<5, boost::lambda::function_action<5, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:867:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<6, boost::lambda::function_action<6, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:899:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<6, boost::lambda::function_action<6> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:927:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<6, boost::lambda::function_action<6, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1058:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Par6, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<7, boost::lambda::function_action<7, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5, Par6), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5, Par6), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1092:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<7, boost::lambda::function_action<7> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1123:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<7, boost::lambda::function_action<7, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1257:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Par6, class Par7, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<8, boost::lambda::function_action<8, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1291:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<8, boost::lambda::function_action<8> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1322:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<8, boost::lambda::function_action<8, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1458:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Par6, class Par7, class Par8, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<9, boost::lambda::function_action<9, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7, Par8), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7, Par8), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1494:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<9, boost::lambda::function_action<9> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1526:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<9, boost::lambda::function_action<9, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1673:1: note: template<class Result, class Par1, class Par2, class Par3, class Par4, class Par5, class Par6, class Par7, class Par8, class Par9, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9, class Arg10> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<10, boost::lambda::function_action<10, Result> >, typename boost::lambda::detail::bind_tuple_mapper<Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7, Par8, Par9), const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9, const Arg10>::type> > boost::lambda::bind(Result (&)(Par1, Par2, Par3, Par4, Par5, Par6, Par7, Par8, Par9), const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&, const Arg10&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1710:1: note: template<class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9, class Arg10> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<10, boost::lambda::function_action<10> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9, const Arg10>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&, const Arg10&) /boost_1_49_0_beta1/boost/lambda/detail/bind_functions.hpp:1743:1: note: template<class Result, class Arg1, class Arg2, class Arg3, class Arg4, class Arg5, class Arg6, class Arg7, class Arg8, class Arg9, class Arg10> const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<10, boost::lambda::function_action<10, Result> >, typename boost::lambda::detail::bind_tuple_mapper<const Arg1, const Arg2, const Arg3, const Arg4, const Arg5, const Arg6, const Arg7, const Arg8, const Arg9, const Arg10>::type> > boost::lambda::bind(const Arg1&, const Arg2&, const Arg3&, const Arg4&, const Arg5&, const Arg6&, const Arg7&, const Arg8&, const Arg9&, const Arg10&) make: *** [functionAndBindTest] Error 1

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Compiler craziness on boost::result_of ? Please help
by John M. Dlugosz 13 Apr '12

13 Apr '12

I'm using Visual Studio 10, and Boost 1.49. The following complete CPP file compiles without error: ===== #include <boost/test/unit_test.hpp> #include "boost/thread/future.hpp" #include <boost/utility/result_of.hpp> #include <functional> using boost::unique_future; template <typename F> unique_future<typename boost::result_of< F() >::type> foo (F&& f) { typedef typename boost::result_of< F() >::type RetType; unique_future<RetType> future_result; return std::move(future_result); } template <typename F, typename A1> unique_future<typename boost::result_of< F(A1) >::type> foo (F&& f, A1&& a1) { return std::move(foo (std::tr1::bind(f,a1))); } class C {}; class D : public C { public: void mf() const { } // virtual void toxic() { } }; void mainfunc() { D* p; foo (&D::mf, p); } ===== But, if you un-comment the definition of toxic, then it will not compile, giving instead: 1>E:\boost_1_49\boost/utility/result_of.hpp(82): error C2825: 'F': must be a class or namespace when followed by '::' 1> E:\boost_1_49\boost/utility/result_of.hpp(90) : see reference to class template instantiation 'boost::detail::result_of_nested_result<F,FArgs>' being compiled 1> with 1> [ 1> F=void (__thiscall D::* &)(void) const, 1> FArgs=void (__thiscall D::* &(D *&))(void) const 1> ] 1> E:\boost_1_49\boost/utility/detail/result_of_iterate.hpp(33) : see reference to class template instantiation 'boost::detail::tr1_result_of_impl<F,FArgs,HasResultType>' being compiled 1> with 1> [ 1> F=void (__thiscall D::* &)(void) const, 1> FArgs=void (__thiscall D::* &(D *&))(void) const, 1> HasResultType=false 1> ] 1> E:\boost_1_49\boost/utility/detail/result_of_iterate.hpp(75) : see reference to class template instantiation 'boost::tr1_result_of<F>' being compiled 1> with 1> [ 1> F=void (__thiscall D::* &(D *&))(void) const 1> ] 1> threadpoolTest.cpp(39) : see reference to class template instantiation 'boost::result_of<F>' being compiled 1> with 1> [ 1> F=void (__thiscall D::* &(D *&))(void) const 1> ] 1>E:\boost_1_49\boost/utility/result_of.hpp(82): error C2516: 'F' : is not a legal base class 1> E:\boost_1_49\boost/utility/result_of.hpp(90) : see declaration of 'F' 1>E:\boost_1_49\boost/utility/result_of.hpp(82): error C2143: syntax error : missing ',' before '::' 1>E:\boost_1_49\boost/utility/result_of.hpp(82): error C2903: 'result' : symbol is neither a class template nor a function template 1>E:\boost_1_49\boost/utility/result_of.hpp(82): error C2039: 'result' : is not a member of '`global namespace'' 1>E:\boost_1_49\boost/utility/result_of.hpp(82): error C2504: 'result' : base class undefined 1>E:\boost_1_49\boost/utility/result_of.hpp(82): error C2143: syntax error : missing ',' before '<' 1>threadpoolTest.cpp(39): error C2893: Failed to specialize function template 'boost::unique_future<boost::result_of<F(T0)>::type> foo(F &&,A1 &&)' 1> With the following template arguments: 1> 'void (__thiscall D::* &)(void) const' 1> 'D *&' 1>threadpoolTest.cpp(39): error C2780: 'boost::unique_future<boost::result_of<F(void)>::type> foo(F &&)' : expects 1 arguments - 2 provided 1> threadpoolTest.cpp(10) : see declaration of 'foo' 1> 1>Build FAILED. Note that both the presence of a virtual function and a base class in necessary. if toxic is present but C is not, then it still works.

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boost::result_of template
by John M. Dlugosz 13 Apr '12

13 Apr '12

Consider these functions: template <typename F> unique_future<typename boost::result_of< F() >::type> foo (F&& f) { ⋯ template <typename F, typename A1> unique_future<typename boost::result_of< F(A1) >::type> foo (F&& f, A1&& a1) { return foo (std::tr1::bind(f,a1)); } I can call foo(&bar,5) to mean the same thing as foo(bind(&bar,5)), OK. But I cannot call foo(&C::mf, pc) to mean the same as foo(bind(&C::mf,pc)) when the binding in question is pc->mf(). That is, bind treats a member function automatically as a function whose first argument is 'this', but boost::result_of does not have the same trick. How can I express the result type of the second form of foo shown above? —John

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Problem with 'future' on compiler without move semantics
by John M. Dlugosz 13 Apr '12

13 Apr '12

In my earlier note, I figured it should just work. But it's not. I think it might be different on Boost 1.47? Can anyone give me a VERY QUICK answer on how to return a unique_future on a compiler without && using Boost 1.47? Thanks! —John In file included from /Volumes/VSee_Source/svnTree/Trunk/stable/Testing/UnitTests/Tools/threadpoolTest.cpp:2: ⋯: error: calling a private constructor of class 'boost::unique_future<int>' return future_result; // built-in mover via implicit conversions ^ /⋯lTest.cpp:61:30: note: in instantiation of function template specialization 'vst::async<int (*)()>' requested here vst::unique_future<int> fi= vst::async (&calculate_the_answer_to_life_the_universe_and_everything); ^ /opt/local/include/boost/thread/future.hpp:619:9: note: implicitly declared private here unique_future(unique_future & rhs);// = delete; ^

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Patch required to build Boost.Locale 1.49 with ICU support
by Peter Klotz 13 Apr '12

13 Apr '12

Hello I followed ICU 49.1 build instructions and have set compiler define U_USING_ICU_NAMESPACE to 0 in order to avoid polluting the global namespace. Doing so requires the attached patch to make Boost.Locale compile with MSVC2010 SP1. Regards, Peter.

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Minimal vector initialization
by Henrik Vallgren 13 Apr '12

13 Apr '12

I'm proposing a small boost library: struct minimal_init {}; template <typename T> struct minimal_constructible : public T { minimal_constructible() : T(minimal_init()) {} }; The purpose of this is to enable vectors of simple structs (containing only POD members) to have resize calling a do-nothing constructor. Let's say that I have a loop that I'd like to calculate in parallel: struct Dummy { Dummy(int a_=0) : a(a_) {} Dummy(const minimal_init &) {} // Without a v-table, this shouldn't need to touch any part of the created object? int a; }; void foo() { #define N 100 std::vector<minimal_constructible<Dummy> > data; data.resize(N); #pragma omp parallel for for (size_t i=0;i<N;++i) data[i].a=i; } Using reserve+push_back is unlikely to create a properly sorted vector. Ideally, we'd add a resize member to std::vector that takes a template T2 that is different from T, just like emplace_back does, but that won't happen soon. I'll probably want to add a few things to make minimal_constructible<T> behave more like a T, but I really liked the idea of a five line boost library ;) Good idea, or not? Thanks in advance, Henrik

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disabling automatic thread-local storage cleanup in boost::thread
by Sarah Tappon 13 Apr '12

13 Apr '12

I would like to use boost::thread (static library) in a DLL project that also includes some managed C++. Thus I am attempting to disable the automatic TLS cleanup, since the TLS callbacks it uses are not compatible with managed code. I have found references to two methods of doing this: 1) Define tss_cleanup_implemented() to prevent the automatic cleanup code from being linked in: http://lists.boost.org/Archives/boost/2007/11/130440.php 2) Build the thread library without tss_pe.cpp: http://boost.2283326.n4.nabble.com/Using-new-threads-link-issues-td2637128.… My questions are: 1) Are these two methods functionally equivalent? 2) How exactly does defining tss_cleanup_implemented prevent the cleanup code from being linked in? Is the idea that if a definition exists locally the linker won't go looking for one in the library and thus won't link the cleanup code either? When I define extern "C" void tss_cleanup_implemented(void){} within my project in the global namespace, I get linker errors about multiply defined symbols (LNK2005, LNK1169) -- are there other linker settings I need to change in order for it to work? I'm using Visual Studio 2008. Finally, I just want to confirm that once I've disabled the automatic cleanup, I only need to call on_thread_exit() from threads launched through the native API that use boost::thread functionality like thread_specific_ptr. If the application only launches threads through boost, I just need to call on_process_enter/exit in main. Correct? Thanks, Sarah

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Several novice questions concerning threading
by Master 12 Apr '12

12 Apr '12

Hello all . i am a newbie to the boost community . i recently started learning about threads in boost . now there are some questions i would like to ask : 1.where can i find examples showing practical uses of boost::thread features? 2.how can i get all threads ID issued by me in my app? 3.how can i iterate through running threads in my app ? 4.is there any kind of means to get all the running threads using boost library? if it does whats the calss? if it doesnt how can i do that? 5.can i resume a thread after pausing it ? ( how can i pause a thread? ) 6. how can i share a variable between two or more threads , suppose i have a loop , i want two threads to simultaneously iterate through it , if thread1 counted to 3, thread2 continues it from 4 and so on . ? i already tried ------ > what is wrong with my sample app ? > #include <iostream> > #include <boost/thread.hpp> > using namespace std; > using namespace boost; > > mutex bmutex; > int i=0; > int sum=0; > void IteratorFunc(int threadid) > { > for ( ; i<25 ; i++) > { > lock_guard<mutex> locker(bmutex); > > cout<<"\t"<<threadid<<"\t"<<this_thread::get_id()<<"\t"<<i<<"\n"; > sum+=i; > } > } > > int main() > { > //boost::posix_time::ptime start = > boost::posix_time::microsec_clock::local_time(); > > thread thrd(IteratorFunc,1); > thread thrd2(IteratorFunc,2); > > cout<<sum; > thrd.join(); > thrd2.join(); > } > Thank you in advance

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