Зачем boost :: thread constructor не принимает параметр boost :: thread :: attributes?

Question

После урока boost::thread «с на thread parameters я придумал следующий фрагмент кода (который, согласно инструкции бустер должен работать):

#include <boost/thread.hpp> 

void WorkerThread(int i) 
{ 
    (void)i; 
} 

int main(int argc, char** argv) 
{ 
    boost::thread::attributes attrs; 
    attrs.set_stack_size(4096*2); 
    boost::thread th(attrs, WorkerThread, 10); 
    th.join(); 
} 

, который дает следующий вывод (из http://coliru.stacked-crooked.com/a/f5710518cc527147)

лязгом === ==========

In file included from main.cpp:1: 
In file included from /usr/local/include/boost/thread.hpp:13: 
In file included from /usr/local/include/boost/thread/thread.hpp:12: 
In file included from /usr/local/include/boost/thread/thread_only.hpp:22: 
In file included from /usr/local/include/boost/thread/detail/thread.hpp:30: 
In file included from /usr/local/include/boost/bind.hpp:22: 
/usr/local/include/boost/bind/bind.hpp:319:9: error: type 'boost::thread_attributes' does not provide a call operator 
     unwrapper<F>::unwrap(f, 0)(a[base_type::a1_], a[base_type::a2_]); 
     ^~~~~~~~~~~~~~~~~~~~~~~~~~ 
/usr/local/include/boost/bind/bind.hpp:1222:16: note: in instantiation of function template specialization 'boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> >::operator()<boost::thread_attributes, boost::_bi::list0>' requested here 
     return l_(type<result_type>(), f_, a, 0); 
      ^
/usr/local/include/boost/thread/detail/thread.hpp:116:17: note: in instantiation of member function 'boost::_bi::bind_t<void, boost::thread_attributes, boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> > >::operator()' requested here 
       f(); 
       ^
/usr/local/include/boost/thread/detail/thread.hpp:96:15: note: in instantiation of member function 'boost::detail::thread_data<boost::_bi::bind_t<void, boost::thread_attributes, boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> > > >::run' requested here 
       thread_data(BOOST_THREAD_RV_REF(F) f_): 
      ^
/usr/local/include/boost/thread/pthread/thread_heap_alloc.hpp:24:24: note: in instantiation of member function 'boost::detail::thread_data<boost::_bi::bind_t<void, boost::thread_attributes, boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> > > >::thread_data' requested here 
      return new T(static_cast<A1&&>(a1)); 
        ^
/usr/local/include/boost/thread/detail/thread.hpp:211:52: note: in instantiation of function template specialization 'boost::detail::heap_new<boost::detail::thread_data<boost::_bi::bind_t<void, boost::thread_attributes, boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> > > >, boost::_bi::bind_t<void, boost::thread_attributes, boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> > > >' requested here 
      return detail::thread_data_ptr(detail::heap_new<detail::thread_data<typename boost::remove_reference<F>::type> >(
               ^
/usr/local/include/boost/thread/detail/thread.hpp:397:25: note: in instantiation of function template specialization 'boost::thread::make_thread_info<boost::_bi::bind_t<void, boost::thread_attributes, boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> > > >' requested here 
      thread_info(make_thread_info(boost::bind(boost::type<void>(),f,a1,a2))) 
         ^
main.cpp:12:21: note: in instantiation of function template specialization 'boost::thread::thread<boost::thread_attributes, void (*)(int), int>' requested here 
     boost::thread th(attrs, WorkerThread, 10); 
        ^
1 error generated. 

НКУ =============

In file included from /usr/local/include/boost/bind.hpp:22:0, 
       from /usr/local/include/boost/thread/detail/thread.hpp:30, 
       from /usr/local/include/boost/thread/thread_only.hpp:22, 
       from /usr/local/include/boost/thread/thread.hpp:12, 
       from /usr/local/include/boost/thread.hpp:13, 
       from main.cpp:1: 
/usr/local/include/boost/bind/bind.hpp: In instantiation of 'void boost::_bi::list2<A1, A2>::operator()(boost::_bi::type<void>, F&, A&, int) [with F = boost::thread_attributes; A = boost::_bi::list0; A1 = boost::_bi::value<void (*)(int)>; A2 = boost::_bi::value<int>]': 
/usr/local/include/boost/bind/bind.hpp:1222:50: required from 'boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()() [with R = void; F = boost::thread_attributes; L = boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> >; boost::_bi::bind_t<R, F, L>::result_type = void]' 
/usr/local/include/boost/thread/detail/thread.hpp:116:17: required from 'void boost::detail::thread_data<F>::run() [with F = boost::_bi::bind_t<void, boost::thread_attributes, boost::_bi::list2<boost::_bi::value<void (*)(int)>, boost::_bi::value<int> > >]' 
main.cpp:14:5: required from here 
/usr/local/include/boost/bind/bind.hpp:319:35: error: no match for call to '(boost::thread_attributes) (void (*&)(int), int&)' 
     unwrapper<F>::unwrap(f, 0)(a[base_type::a1_], a[base_type::a2_]); 
     ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

что это проблема?

Answer 1

Он вызывает неправильный конструктор boost::thread.

The constructor that accepts the attributes только принимает вызываемую функцию (поток) без аргументов. Следовательно, вам нужно создать вызываемый объект самостоятельно с помощью выражения boost::bind, std::bind или C++ 11 lambda.

т.д .:

boost::thread th(attrs, boost::bind(WorkerThread, 10));