C++ Logo

STD-PROPOSALS

Advanced search

Subject: Re: [std-proposals] Allowing access to object representations
From: language.lawyer_at_[hidden]
Date: 2019-08-19 17:48:45


On 20/08/2019 01:23, Brian Bi wrote:
> Sorry, my fault for not understanding what you wrote previously. But are
> you sure this interpretation is sensible?

If you need an authority, AFAIR you may find R. Smith explaining this in the old std-discussion list.
But IMO this is clear enough, at least after you've learned it ;)

> I think it's impossible to say
> that the lifetime of an array does not end while the lifetimes of its
> elements end.

Why???
The Standard seem to know about objects whose subobjects may not be alive, like in [intro.object]/2:
> If an object is created in storage associated with a member subobject or array element e (which may or may not be within its lifetime)

It is even possible, for some types (not array types, though), to end the lifetime of a containing object without ending the lifetimes of all (or even any!) of its subobjects...

>> (I'd say it always was undefined)
>>
>
> CWG thought it was well-defined in 2011.

Fortunately, they realized quickly enough that they were wrong and did not close a similar issue in 2013.


STD-PROPOSALS list run by herb.sutter at gmail.com

Standard Proposals Archives on Google Groups