Bill Wade wrote:

> Valentin Bonnard wrote in message <37BAC0EC.7C43@wanadoo.fr>...
> >
> >Bill Wade wrote:
> >
> >> 2) class iterator: public const_iterator { ... };    // inherit
> operator==()
> >
> >At any rate, no. An iterator IS-NOT-A const iterator.
>
> If it makes you feel better use
>   class iterator: const_iterator { public: using const_iterator::operator==;
> ... };
>
> However I'd argue that iterator IS-very-close-to-being-A const_iterator.

It is as a concept, not as a class.

> Almost anything you can do with a const iterator you can also do with an
> iterator.

Anything, since there is a conversion <g>

Seriously, everything allowed with a Const Iterator is
also allowed with an Iterator.

I would say that at the _concept_ of Iterator IS-A Const
Iterator but that a particular iterator _instance_ cannot
be treated as a const_iterator _instance_.

--

Valentin Bonnard


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