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

From: Howard Hinnant (hinnant_at_[hidden])
Date: 2004-03-11 11:54:32

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);

-Howard