RU008 [class.cdtor].2 Clarify value of *this during construction

[wg21bot]

Clarify that *this in constructors could not alias with reference input parameters of the same type. This is useful for optimizing all the constructors of all the classes.

Proposed change:
Apply the following changes to the [class.cdtor] paragraph 2:
During the construction of an object, if the value of the object or any of its subobjects is accessed through a glvalue that is not obtained, directly or indirectly, from the constructor's this pointer, the value of the object or subobject thus obtained is unspecified undefined.

[jfbastien]

Does EWG want to consider this for C++20?

F	A
0	13

No consensus for change.

[jensmaurer]

Rejected. There was no consensus to adopt this change.