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
1806. Virtual bases and move-assignmentSection: 11.4.6 [class.copy.assign] Status: CD4 Submitter: Richard Smith Date: 2013-11-04[Moved to DR at the November, 2014 meeting.]
The proposed resolution for issue 1402 overlooked some needed changes in 11.4.5.3 [class.copy.ctor] paragraph 28.
Proposed resolution (February, 2014):
Change 11.4.5.3 [class.copy.ctor] paragraph 28 as follows:
...It is unspecified whether subobjects representing virtual base classes are assigned more than once by the implicitly-defined copy /move assignment operator. [Example:
struct V { }; struct A : virtual V { }; struct B : virtual V { }; struct C : B, A { };It is unspecified whether the virtual base class subobject V is assigned twice by the implicitly-defined copy /move assignment operator for C. —end example] [Note: This does not apply to move assignment, as a defaulted move assignment operator is deleted if the class has virtual bases. —end note]
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