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

Steve Folly 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