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From: David Abrahams (dave_at_[hidden])
Date: 2003-02-19 10:05:36

"Peter Dimov" <pdimov_at_[hidden]> writes:

> You said "optional<T>" above.

"Do what I mean, not what I say" ;-)

> 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*.

Good point.

> What's wrong with it? What does optional<T&> add?

Suppose you have a

     variant<mpl::list<int&, std::string&> >

How do you check to see if it contains an int&?

Dave Abrahams
Boost Consulting

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