id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
2893	Function Input Iterator	anonymous	Dave Abrahams	"Simply put a the function input iterator implementation wraps a nullary function object and allows for bounded iterators using an embedded state variable. The use case is for something like the following:

{{{
struct generator {
 typedef int result_type;
 generator() { srand(time(0)); }
 result_type operator() () const { return rand(); }
};

using namespace std;
using namespace boost;

int main(int argc, char * argv[]) {
 generator f;
 copy(
   make_function_input_iterator(f, infinite()),
   make_function_input_iterator(f, infinite()),
   ostream_iterator<int>(cout, "" "")
   );
 return 0;
}
}}}

And if you don't want an infinite range, you can simply bound it:

{{{
copy(
  make_function_input_iterator(f, 0),
  make_function_input_iterator(f, 10),
  ostream_iterator<int>(cout, "" "")
);
}}}
"	Library Submissions	closed	To Be Determined	iterator		Not Applicable	fixed	iterator function input	mikhailberis@…