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

From: David Abrahams (dave_at_[hidden])
Date: 2003-11-21 20:28:48

"Peter Dimov" <pdimov_at_[hidden]> 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