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Re: [wg14/wg21 liaison] Fwd: native_handle_type

From: Billy O'Neal (VC LIBS) <"Billy>
Date: Tue, 20 Aug 2019 19:01:30 +0000
> That vote appears to have assumed an ABI breaking replacement of
std::thread::native_handle_type etc.



If I recall correctly the concern was about any potential new handle like type added in the future which would be ABI breaking for anyone using the proposed union; not that the proposed union itself would be an ABI break.



The discussion with std::thread was Bill explaining to the room that threadís native_handle_type might not exist, hence the subsequent vote saying that we need to require that fstreamís equivalent exist; that we canít use the same wording from thread.



> Under my proposal, native handle types can be invalid i.e. empty.



Right, the room wanted to make sure at a minimum that happened, that an implementation couldnít just not provide the type at all.



Billy3



________________________________
From: Liaison <liaison-bounces_at_[hidden]> on behalf of Niall Douglas via Liaison <liaison_at_[hidden]>
Sent: Tuesday, August 20, 2019 3:29:50 AM
To: liaison_at_[hidden] <liaison_at_[hidden]>
Cc: Niall Douglas <s_sourceforge_at_[hidden]>
Subject: Re: [wg14/wg21 liaison] Fwd: native_handle_type

On 19/08/2019 19:04, Billy O'Neal (VC LIBS) via Liaison wrote:
> LEWGi looked at this in Cologne and said that they donít want it, so Iím
> not sure itís appropriate to bug WG14 at this time:
> https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwiki.edg.com%2Fbin%2Fview%2FWg21cologne2019%2FP1759&amp;data=02%7C01%7Cbion%40microsoft.com%7C1480b43ba8854651860b08d725595d8e%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637018938068834179&amp;sdata=y530%2FnBgxZpP9pCzpr0n0Adejq0gLDyvb3Z1RZIzSao%3D&amp;reserved=0

That vote appears to have assumed an ABI breaking replacement of
std::thread::native_handle_type etc.

> Note also that the *existence* of such members is implementation
> defined, so an implementation can define that they donít exist.

Under my proposal, native handle types can be invalid i.e. empty.

Niall
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Received on 2019-08-20 14:03:33