Subject: Re: [boost] [Smart Ptr] make_shared slower than shared_ptr(new) on VC++9 (and 10) with fix
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2012-04-28 06:22:29
On 27/04/12 01:59, Peter Dimov wrote:
> Mathias Gaunard wrote:
>> I suppose you probably want to say that the type you're accessing the
>> object with is actually the dynamic type of the object, but that idea
>> is not supported anywhere in the standard.
> 3.8, object lifetime.
In lack of a proper explanation, I will assume that your argument is
that the array member lifetime has ended and you're re-using its storage
to store an object of a different type.
Is that what you meant?
Assuming this is true (which I'm not entirely sure of, the fact that it
is a subobject might be a problem), there still is 3.8/7 to consider,
which does not allow you to re-use the storage for any other type if
there is any reference to the original object.
I don't see how the copy constructor of the class could avoid referring
to the original object.
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk