[Boost-users] Re: (onlist) Using boost::lamba with a vector of shared_ptr's

"Peter Dimov" <pdimov@mmltd.net> writes:

Hi,

Jaakko Jarvi wrote:

...

...

The second alternative doesn't work since Lambda doesn't support *_1 for shared_ptr.

In particular, Lambda's return type deduction templates are not aware of shared_ptr.

They do not need to be aware of shared_ptr. shared_ptr provides ::element_type, for consistency with std::auto_ptr. boost::shared_ptr also has ::reference, although tr1::shared_ptr might not. You just need to look for the individual typedef and not instantiate iterator_traits prematurely.

But what if iterator_traits is specialized? The typedef could say the wrong thing. -- Dave Abrahams Boost Consulting www.boost-consulting.com