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Update C.12 to apply to copyable/movable types, closes #2012

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Herb Sutter 2023-01-19 14:42:25 -08:00
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@ -4748,11 +4748,11 @@ so they can't be regular; instead, they tend to be move-only.
???
### <a name="Rc-constref"></a>C.12: Don't make data members `const` or references
### <a name="Rc-constref"></a>C.12: Don't make data members `const` or references in a copyable or movable type
##### Reason
They are not useful, and make types difficult to use by making them either uncopyable or partially uncopyable for subtle reasons.
`const` and reference data members are not useful in a copyable or movable type, and make such types difficult to use by making them at least partly uncopyable/unmovable for subtle reasons.
##### Example; bad
@ -4770,7 +4770,7 @@ If you need a member to point to something, use a pointer (raw or smart, and `gs
##### Enforcement
Flag a data member that is `const`, `&`, or `&&`.
Flag a data member that is `const`, `&`, or `&&` in a type that has any copy or move operation.