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

From: Ashkan Aliabadi (ashkan.aliabadi_at_[hidden])
Date: 2008-03-07 13:28:47

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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