Re: [Boost-users] [Boost.Iterators] iterator_facade + a class design issue

From: Ashkan Aliabadi (ashkan.aliabadi_at_[hidden])
Date: 2008-03-07 19:43:52

Following node_iter example of iterator_facade
(here<http://www.boost.org/libs/iterator/doc/iterator_facade.html#tutorial-example>),
how can I wrap that inside an any_iterator? I'm really having a hard time
figuring that out. I'm using an any_iterator implementation by Thomas Becker
(here<http://thbecker.net/free_software_utilities/type_erasure_for_cpp_iterators/start_page.html>).
I would really appreciate it if anyone could give me a hand.

Regards

On Fri, Mar 7, 2008 at 10:28 AM, Ashkan Aliabadi <ashkan.aliabadi_at_[hidden]>
wrote:

> Thanks a lot. I appreciate the help :)
>
>
> On Fri, Mar 7, 2008 at 2:53 AM, Roman Perepelitsa <
> roman.perepelitsa_at_[hidden]> wrote:
>
> > Ashkan Aliabadi <ashkan.aliabadi <at> gmail.com> writes:
> >
> > >
> > > Dear all,I've decided to write an ABC named BasicIterator, from which
> > all
> > derived iterators are to be descended. The reason being that I have to
> > refer to
> > iterators inside an interface and I need a general base type as a place
> > holder
> > to which I can refer. Besides, I don't want to use CRTP in the
> > interface, but I
> > don't care if I'm forced to use it inside BasicIterator.As discussed in
> > the
> > interoperability section of iterator_facade (here), the euqal() function
> > must be
> > templatized. The problem is that I have to make equal() a pure virtual
> > member
> > function in order to force derived types override it, but templated
> > virtual
> > functions on the other hand, are not valid.So I was wondering what the
> > best
> > approach is. How can I achieve both of these goals? Please advise.Any
> > ideas/suggestions are welcome.Thanks in advance
> >
> > You might want to take a look at any_range from oven library
> > (
> > http://p-stade.sourceforge.net/oven/doc/html/oven/ranges.html#oven.ranges.any_range
> > )
> > or any_iterator from adobe opensource library
> > (http://stlab.adobe.com/classadobe_1_1any__iterator.html). Both of them
> > provide
> > convenient way for declaring methods in interface classes that return or
> > accept
> > ranges of values.
> >
> > HTH,
> > Roman Perepelitsa.
> >
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> >
>
>