[thread] attribute constructor failing to compile

From: Jeanette C. (julien_at_[hidden])
Date: 2022-05-21 18:36:04

Hey hey,
using boost 1.78 from the Archlinux repository, using the thread constructor 
with
boost::thread::attributes
as first argument fails to compile.

The relevant code from the small test program is this:
void work(bool& done)
// simple main function for the thread
int main()
{
   bool done = false;

   boost::thread::attributes attr;
   // all changes commented out in the program
   boost::thread th1(attr, work, std::ref(done));
   // some code, sleep and set done to true
   th1.join();
   return 0;
}

g++ 11.2.0 reports the following error:
In file included from /usr/include/boost/thread/detail/thread.hpp:33,
                  from /usr/include/boost/thread/thread_only.hpp:22,
                  from /usr/include/boost/thread/thread.hpp:12,
                  from thread_prio.cpp:1:
/usr/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<int (*)(bool&)>; A2 = boost::_bi::value<std::reference_wrapper<bool> >]':
/usr/include/boost/bind/bind.hpp:1273:18:   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<int (*)(bool&)>, boost::_bi::value<std::reference_wrapper<bool> > >; boost::_bi::bind_t<R, F, L>::result_type = void]'
/usr/include/boost/thread/detail/thread.hpp:120:18:   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<int (*)(bool&)>, boost::_bi::value<std::reference_wrapper<bool> > > >]'
/usr/include/boost/thread/detail/thread.hpp:118:18:   required from here
/usr/include/boost/bind/bind.hpp:298:35: error: no match for call to '(boost::thread_attributes) (int (*&)(bool&), std::reference_wrapper<bool>&)'
   298 |         unwrapper<F>::unwrap(f, 0)(a[base_type::a1_], a[base_type::a2_]);
       |         ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The syntax is based on this part of the manual:
https://www.boost.org/doc/libs/1_79_0/doc/html/thread/thread_management.html#thread.thread_management.tutorial.attributes

Is that perhaps a feature only introduced in version 1.79 of the Boost 
libraries?

Best wishes and thanks for any pointers,

Jeanette

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