[boost] Re: bind vs. mem_fn with data members

Howard Hinnant <hinnant@twcny.rr.com> writes:

On Mar 11, 2004, at 9:42 AM, David Abrahams wrote:

...

This surprised me; should it have?

#include <boost/bind.hpp> #include <boost/mem_fn.hpp>

struct X { int y; };

int main() { boost::mem_fn(&X::y); // OK boost::bind(&X::y); // Error! }

I'm not seeing any surprises. mem_fn(&X::y) produces a function object that takes one parameter. Therefore the bind equivalent needs an argument or a placeholder:

bind(&X::y, _1);

DUH!! Thanks, Howard! -- Dave Abrahams Boost Consulting www.boost-consulting.com