[Boost-users] Re: shared_ptrs with std::mem_fn

From: David Abrahams (dave_at_[hidden])
Date: 2004-05-06 20:55:27

Steve Folly <boost_at_[hidden]> writes:

> Hi,
>
> I've converted a container to use shared_ptrs instead of regular pointers,
> now my for_each algorithm doesn't work:
>
> Before:
>
>   class Attr;
>   
>   std::vector< Attr* > mAttributes;
>   .
>   .
>   .
>   std::for_each( mAttributes.begin(), mAttributes.end(),
>                  std::bind2nd( std::mem_fn( &Attr::Write ), output ) );
>
> After:
>
>   std::vector< shared_ptr<Attr> > mAttributes;
>
>
> Now it doesn't compile because (of course) Attr::Write is not a method of
> shared_ptr<Attr>.
>
> Do I have to use boost's bind and mem_fn objects instead of std?

Yes; bind and mem_fn handle this problem (and quite a few others) automatically.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com