Re: [boost] Separate iterator operators from iterator traits?

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2001-09-03 22:38:30

That seems like a good idea. Why don't you post a patch?

Please include documentation changes.
Please also try to make your changes minimal, to ease the review and
integration process.

-Dave

----- Original Message -----
From: "Daryle Walker" <darylew_at_[hidden]>
To: "Boost" <boost_at_[hidden]>
Sent: Monday, September 03, 2001 2:42 PM
Subject: [boost] Separate iterator operators from iterator traits?

> In <boost/operators.hpp>, we have templates like:
>
>
file://=====================================================================
=====
> template <class T,
>           class V,
>           class D = std::ptrdiff_t,
>           class P = V*,
>           class R = V&>
> struct bidirectional_iterator_helper
>   : equality_comparable1<T
>   , unit_steppable<T
>   , dereferenceable<T, P
>   , boost::iterator<std::bidirectional_iterator_tag, V, D, P, R
>     > > > > {};
>
file://=====================================================================
=====
>
> where the operator helpers are attached to the iterator base.  Maybe we
can
> do a separation like:
>
>
file://=====================================================================
=====
> template <class T, class P, class B = ::boost::detail::empty_base>
> struct bidirectional_iterator_operators
>     : equality_comparable1<T
>     , unit_steppable<T
>     , dereferenceable<T, P, B
>       > > > {};
>
> //...
>
> template <class T,
>           class V,
>           class D = std::ptrdiff_t,
>           class P = V*,
>           class R = V&>
> struct bidirectional_iterator_helper
>   : bidirectional_iterator_operators <T, P
>   , boost::iterator<std::bidirectional_iterator_tag, V, D, P, R
>     > > {};
>
file://=====================================================================
=====
>
> in case we need to supply the iterator base in a different manner (like
now
> when I'm trying to use these operators with an iterator based off a
reverse
> iterator of another iterator class I defined).
>
> --
> Daryle Walker
> Mac, Internet, and Video Game Junkie
> darylew AT mac DOT com
>
>
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