id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
4569	[patch] fusion::unfused reusability / perfect forwarding	anonymous	t_schwinger	"attached is a patch to unfused.hpp, used by fusion::make_unfused.

what it does:
 * ""fused"" currently forces you to store a function object in order to use the ""unfusing"" interface. this patch makes the interface of unfused reusable by other classes, by introducing a CRTP class ""unfuse_interface"", that is used by unfused.
simplified example:

{{{

class unfused : unfused_interface<unfused,...>{
private:
  friend class unfused_interface;
  result call(Args &args){
    //unfused::operator()(...) was called. args is a sequence
    //of the passed arguments
    return stored_fused_functor(args);
  }
  Function stored_fused_functor;
};

}}}

 * perfect forwarding:

""unfused"" only takes non-const references as arguments.
this patch changes that to the compromise of boost::bind():
perfect forwarding for up to 2 arguments, beyond that either all arguments are const refs, or all arguments are non-const refs.
"	Patches	new	To Be Determined	fusion	Boost 1.44.0	Problem