[boost] [thread] Promote detail::invoke

Subject: [boost] [thread] Promote detail::invoke
From: Agustín K-ballo Bergé (kaballo86_at_[hidden])
Date: 2014-06-16 00:47:53

Boost.Thread has a great implementation of `invoke` in it's detail 
namespace. I would like to see this moved outside of Threads, so that 
other libraries can benefit from it (or course, only if Vicente thinks 
this is ok). This seems like an ideal candidate for the Detail 
submodule, as several other libraries have a need for this piece of 
functionality.

The implementation relies on `BOOST_THREAD_[RV|FWD]_REF`, which could be 
replaced by `BOOST_[RV|FWD]_REF`. This would mean introducing a 
dependency on Boost.Move, but I'll leave those details to the people 
leading the modularization effort.

Regards,
-- 
Agustín K-ballo Bergé.-
http://talesofcpp.fusionfenix.com