Re: [boost] [review] Fusion review, finalization

From: David Abrahams (dave_at_[hidden])
Date: 2006-05-15 08:51:00

Joel de Guzman <joel_at_[hidden]> writes:

>>> Unfortunately for Fusion iterators, I can't find a suitable workaround
>>> to enable operator-> return type deduction only when appropriate. In
>>> general, an iterator does not know if it is at the end.
>> 
>> That part seems strange to me.  It certainly could know whether it's
>> at the end, I think.
>
> Thinking about it some more, you may be right. Maybe I can use
> the disable_if technique. At the very least, I'll need a
> is_dereferencable<I> metafunction so I can also disable ->
> on adapted iterators.

You don't need to disable it; just pick some arbitrary type, like
void, for it to return.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com