Messages in this thread | | | From | David Laight <> | Subject | RE: [PATCH] linux/const.h: Explain how __is_constexpr() works | Date | Wed, 2 Feb 2022 08:49:33 +0000 |
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From: Rasmus Villemoes > Sent: 01 February 2022 13:06 ... > > + * - The C standard defines an "integer constant expression" as different > > + * from a "null pointer constant" (an integer constant 0 pointer). > > I don't see the point of this bullet. Yes, an ICE is a distinct concept > from a null pointer constant, obviously. One is defined in terms of the > other - and your parenthesis is not an accurate paraphrase of the > definition of a null pointer constant.
From what I remember a "null pointer constant" is in "integer constant expression with value 0 cast to a pointer type". So (void *)(1-1) is just as valid as (void *)0.
Not sure any of it is relevant here.
David
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