This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112c. See for the official list.


2610. Indirect private base classes in aggregates

Section: 9.4.2  [dcl.init.aggr]     Status: C++23     Submitter: Chris Bowler     Date: 2022-07-21

[Accepted as a DR at the November, 2022 meeting.]

The wording appears to prohibit aggregates from having indirect private base classes. That does not match existing practice and is an unnecessary restriction. For example:

#include <type_traits>

struct B1 {};
struct B2 : private B1 {};
struct S : public B2 {};

void f() {

Proposed resolution (approved by CWG 2022-08-26):

Change in 9.4.2 [dcl.init.aggr] paragraph 1 as follows:

An aggregate is an array or a class (Clause 11 [class]) with