[meta.member] Clarify is_corresponding_member semantics #4768
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The definition of 'common initial sequence' in [class.mem] only applies to standard-layout struct types, which excludes unions. There is no reason to define is_corresponding_member in terms of standard-layout types (which includes unions and scalars and arrays of such types) when the common initial sequence is only meaningful for standard-layout structs.
jensmaurer
approved these changes
Jul 21, 2021
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The definition of 'common initial sequence' in [class.mem] only applies
to standard-layout struct types, which excludes unions. There is no
reason to define is_corresponding_member in terms of standard-layout
types (which includes unions and scalars and arrays of such types) when
the common initial sequence is only meaningful for standard-layout
structs.