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

2663. Example for member redeclarations with using-declarations

[Accepted as a DR at the June, 2023 meeting.]

Issue 36 was resolved by P1787R6, but no example was added.

Proposed resolution (approved by CWG 2023-06-13):

1. Add an example to 9.10 [namespace.udecl] paragraph 8 as follows:

   [ Example:

    struct C { int i; }; struct D1 : C { }; struct D2 : C { }; struct D3 : D1, D2 { using D1::i; // OK, equivalent to using C::i using D1::i; // error: duplicate using D2::i; // error: duplicate, also names C::i }; 

   -- end example ]

2. Change the example in 9.10 [namespace.udecl] paragraph 10 as follows:

    using B::x; using A::x; // OK, hides struct B::x using A::x; // OK, does not conflict with previous using A::x x = 99; // assigns to A::x struct x x1; // x1 has class type B::x } 

CWG 2023-01-06

There is implementation divergence in handling this example.

CWG 2023-02-07

P1787R6 clarified that the example added to 9.10 [namespace.udecl] paragraph 10 is accepted, even in the non-function case.