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

From: David Abrahams (dave_at_[hidden])
Date: 2004-03-11 15:19:50

Howard Hinnant <hinnant_at_[hidden]> 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