Re: [boost] Re: unions

From: E. Gladyshev (egladysh_at_[hidden])
Date: 2003-10-08 16:36:19

--- David Abrahams <dave_at_[hidden]> wrote:
[...]

> Sorry to be so blunt, but that's just crazy.  Without the basic
> guarantee, any program invariant is allowed to be disrupted by an
> exception, and recovery is impossible.

I don't get what you mean. I can always handle exceptions
on my own just like in case of typical class or C style union
types.  What is so special about variant? 

What is program invariant?

> > Even if you decide to support basic guarantees, why do you need the
> > heap backup and first-type based switch?
> 
> Because of variant's invariant: "thou shalt always contain a value of
> one of your types".

Who said that?

Eugene

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