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

From: Jaakko Jarvi (jajarvi_at_[hidden])
Date: 2003-11-21 14:53:18

On Fri, 21 Nov 2003, Peter Dimov wrote:

> 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.

Ok, thanks. In any case, lambda's return type deduction rules do
not cover the convention of ::element_type.

  Jaakko