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From: Peter Dimov (pdimov_at_[hidden])
Date: 2003-02-19 09:11:03

David Abrahams wrote:
> "Peter Dimov" <pdimov_at_[hidden]> writes:
>> Joel de Guzman wrote:
>>> David Abrahams wrote:
>>>> BTW, I just realized that a conversion from variant<T> to
>>>> optional<T> could be used to do extraction as well. Maybe it


>>>> would be better to ditch extract altogether and just use optional?
>>> I think this makes sense. The disadvantage is the overhead of
>>> optional just to do "extract"ion.
>> That means an extra copy
> Really? You can't convert to an optional<T&>?

You said "optional<T>" above.

It may be possible to use optional<T&> (is it supported?) or optional<
reference_wrapper<T> > but this looks like an "obfuscated C++" entry to me
compared to T*. What's wrong with it? What does optional<T&> add?

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