N3126:18.1/3 says "offsetof (_type_, _member-designator_).  What is a
_member-designator_?

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On 30 Aug., 21:31, Krzysztof    elechowski <giecr...@stegny.2a.pl>
wrote:
> N3126:18.1/3 says "offsetof (_type_, _member-designator_).  What is a
> _member-designator_?

The C++ standard does not really use this term, it is just part of the
reference to the C Standard. Note that [diff.offsetof] delegates the
complete meaning of the "offsetof" macro to <cstddef> and says
that 18.2 [support.types] describes the *differences*. 18.2 again
says

"The contents are the same as the Standard C library header
<stddef.h>,
with the following changes:"

and among the changes for offsetof, only the "type" part has some
different requirements and the expression as a whole. As of C99,
"member-designator" is a structure member of the type specified
in the first argument. It would not even be necessary to define what
/type/ means, except that the C++ standard clearly gives an extra
rule for a standard-layout class, which is a type category.

HTH & Greetings from Bremen,

Daniel Kr   gler


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