This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-04-13
2690. Semantics of defaulted move assignment operator for unionsSection: 11.4.6 [class.copy.assign] Status: C++23 Submitter: Cassio Neri Date: 2023-01-20[Accepted as a DR at the February, 2023 meeting.]
Subclause 11.4.6 [class.copy.assign] paragraph 13 does not specify the semantics of a defaulted move assignment operator:
The implicitly-defined copy assignment operator for a union X copies the object representation (6.8.1 [basic.types.general]) of X. ...
In contrast, the corresponding rule for move constructors is present in 11.4.5.3 [class.copy.ctor] paragraph 15:
The implicitly-defined copy/move constructor for a union X copies the object representation (6.8.1 [basic.types.general]) of X. ...
Proposed resolution (approved by CWG 2023-01-27):
Change in 11.4.6 [class.copy.assign] paragraph 13 as follows:
The implicitly-defined copy /move assignment operator for a union X copies the object representation (6.8.1 [basic.types.general]) of X. ...
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