Re: [boost] Re: basic guarantees in variant

From: E. Gladyshev (egladysh_at_[hidden])
Date: 2003-10-08 23:47:10

--- Brian McNamara <lorgon_at_[hidden]> wrote:
[...]
> This is clever.  

Glad you liked it.

> Is it legal?  I know it's legal for POD types.  I can't
> find text in the standard which makes it legal for non-POD types.  But
> at the same time, offhand I can't imagine an implementation where it
> wouldn't work.
> 
> Can you treat a non-POD type as a "bag of bits" temporarily, just to
> move it off to the side, and then move it back to the same location and
> treat it as an object again?

Wait a second the CPU does it all the time, you know L1 cache and stuff. :)
Seriously in practice you don't want to do it often because
another operation may indirectly reference the moved object.
In this particular case it is not a problem because
it is an assignment operator that assumes that the current rhs 
content is destroyed anyway before anything else can happen.

Eugene

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