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Subject: Re: [boost] Strong guarantee variant (Was: Outcome/expected/etc/etc/etc)
From: Peter Dimov (lists_at_[hidden])
Date: 2017-06-06 11:14:55

Niall Douglas wrote:
> > I wonder whether the people who insist on the strong guarantee on
> > assignment realize that when the variant holds a vector, and you assign
> > it a vector, assignment delegates to vector<>::operator= and as a result
> > you get the basic guarantee because that's what all standard types
> > provide.
> I'd expect nothing else. No state change means you always pass through to
> operator=().

I don't understand of what value is a guarantee that is strong when you
change type, but basic if you don't, but perhaps I'm missing something here.

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