id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
8463,function_output_iterator: MSVC warning C4512,Mike Cowperthwaite <michael.cowperthwaite@…>,jeffrey.hellrung,"In `boost/function_output_iterator` the struct `function_output_iterator::output_proxy` yields this warning: ""assignment operator could not be generated.""
I see this primarily using signals2, where the iterator class is created using  `boost::signals2::detail::does_nothing`  as the iterator template argument.

The warning is due to the proxy's const data member, and probably not dependent on the iterator template argument.

The struct also has a templated operator= defined, but not of the sort that would work as a copy-assignment.

Other libraries (fusion, spirit, statechart in particular) have implemented do-nothing assignment operators (or just declarations) to overcome similar symptoms.  If I do the same for this class in my local copy -- simply add a declaration for this particular signature:
{{{
  private:
    output_proxy& operator=(output_proxy const &src);
}}}
the warning goes away; however, I can't be sure this doesn't break something.  It seems unlikely, as I can run code with the warning and my signals seem to work just fine.",Bugs,new,To Be Determined,iterator,Boost 1.52.0,Problem,,,