[Boost-users] Why is cref required in this nested bind example?

Hello, Can someone please explain why a cref is needed in the last line of the attached code snippet? Thank you, Chris === #include #include using boost::bind; using boost::cref; using boost::function; void a() { } void b(function) { } void f() { //bind(b, bind(a)); bind(b, cref(bind(a))); }