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Re: [wg14/wg21 liaison] Fwd: native_handle_type

From: Billy O'Neal (VC LIBS) <"Billy>
Date: Mon, 19 Aug 2019 18:04:02 +0000
> WG21 is thinking about standardising a native_handle_type

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: http://wiki.edg.com/bin/view/Wg21cologne2019/P1759


> That means that the implementation does whatever is necessary to make it work, for some unspecified meaning of "work".

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


From: Liaison <liaison-bounces_at_[hidden]> on behalf of pete--- via Liaison <liaison_at_[hidden]>
Sent: Monday, August 19, 2019 9:58:47 AM
To: liaison_at_[hidden] <liaison_at_[hidden]>
Cc: pete_at_[hidden] <pete_at_[hidden]>
Subject: Re: [wg14/wg21 liaison] Fwd: native_handle_type

On Aug 19, 2019, at 12:08 PM, Niall Douglas via Liaison <liaison_at_[hidden]> wrote:
> There is precedent here. You can ask POSIX what kind of inode a file
> descriptor refers to. Same goes here for native handle type, which
> similarly refers to some implementation-defined-structure-elsewhere.
> Indeed, as you may have noticed in my forwarded message to WG14, one
> could even use mode_t as the union discriminant on POSIX platforms.

Let me ask you again a question that you elided when you quoted me:

If the standard adds support for determining the type (for whatever meaning of ďtypeĒ is involved here), what then? What can you do **portably** that you canít do **portably** without that information?

  -- Pete
Roundhouse Consulting, Ltd.

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Received on 2019-08-19 13:06:05