Re: [boost] Formal review or Variant Library (Ed B.)

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
www.boost-consulting.com