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From: Douglas Paul Gregor (gregod_at_[hidden])
Date: 2003-10-10 08:20:50

On Fri, 10 Oct 2003, Brian McNamara wrote:
> Hmm. While writing this up, it occurred to be that in FC++, there are a
> few places where the result_of type is maybe incorrect. For example,
> odd_list<int> oli;
> ... delay( oli ) ...
> I think that maybe delay() here returns a
> const list<int>&
> whereas result_of< delay_type( odd_list<int> ) >::type is
> list<int>
> Hmm. Interesting how you can find such "bugs" just by trying to nail
> down concepts.
> Douglas, are you reading this? Given both
> and what we know about where typeof/decltype/etc. are headed in the
> standardization process, should a function object that returns a
> "const X&" declare its "result_of" to be "X" or "const X&"?

const X&

result_of is intended to ensure perfect forwarding, even if we get a
broken typeof/decltype that eats references and cv-qualifiers. If the
standardese is not clear on that regard, I would appreciate any help in
fixing it.


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