id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
4582	fold() doesn't work with function objects that don't support perfect forwarding	anonymous	Christopher Schmidt	"the unrolled specializations of fold() are implemented as

{{{
f(f(f(state,a),b),c)
}}}

if f is a function object that doesn't support perfect forwarding, but only accepts ""T &"" arguments, this doesn't work.

this is e.g. the case for all phoenix::bind() results:

{{{
int f(int,int,int){ return 0; }

int main(){
    fusion::vector<int,int> vec;
    fusion::fold(vec,0,phoenix::bind(&f,_1,_2,3)); //error
}

}}}

AFAIK a bind() cannot support perfect forwarding and at the same time support the result_of protocol, not even for up to 2 arguments as Boost.Bind does.

attached is a patch that changes that.
"	Bugs	closed	To Be Determined	fusion	Boost Development Trunk	Problem	fixed