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Re: Can offsetting a non-null pointer result in a null one?

From: Andreas Schwab <schwab at suse dot de>
To: Richard Biener <richard dot guenther at gmail dot com>
Cc: lh_mouse at 126 dot com, Jeff Law <law at redhat dot com>, GCC Development <gcc at gcc dot gnu dot org>
Date: Mon, 20 Aug 2018 10:53:11 +0200
Subject: Re: Can offsetting a non-null pointer result in a null one?
References: <99f401a9-9419-819b-cbe0-b3b062c5372e@126.com> <5e7559a0-e774-052a-87a2-213a1024054e@redhat.com> <ca0099d2-bb98-f955-9fee-13f0f0e42c7f@126.com> <CAFiYyc1uFLou56Kz1p4BftQOd2cWFFTXuP3H4rw92gkFLDd=Dw@mail.gmail.com>

On Aug 20 2018, Richard Biener <richard.guenther@gmail.com> wrote:

> Btw, I can't find wording in the standards that nullptr + 1 is
> invoking undefined behavior,
> that is, that pointer arithmetic is only allowed on pointers pointing
> to a valid object.
> Any specific pointers?

All of 5.7 talks about pointers pointing to objects (except when adding
0).

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
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Follow-Ups:
- Re: Can offsetting a non-null pointer result in a null one?
  - From: Richard Biener

References:
- Can offsetting a non-null pointer result in a null one?
  - From: Liu Hao
- Re: Can offsetting a non-null pointer result in a null one?
  - From: Jeff Law
- Re: Can offsetting a non-null pointer result in a null one?
  - From: Liu Hao
- Re: Can offsetting a non-null pointer result in a null one?
  - From: Richard Biener

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