This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 116a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2024-12-19
[Voted into the WP at the March, 2011 meeting.]
The current wording of 6.4.2 [basic.scope.pdecl] does not specify the point of declaration for an alias-declaration (although it does do so in paragraph 3 for a template alias: “The point of declaration of a template alias immediately follows the identifier for the alias being declared”). One might assume that an alias-declaration would be the same, but it's not clear that that is the right resolution (for either declaration, but especially for the alias-declaration).
An alias-declaration is intended to be essentially a different syntactic form of a typedef declaration (9.2.4 [dcl.typedef] paragraph 2). Placing the point of declaration at the trailing semicolon instead of following the name of the alias would allow more compatibility with the capabilities of typedefs, for instance:
struct S { }; namespace N { using S = S; }
Notes from the November, 2010 meeting:
The CWG agreed that the point of declaration for both template and non-template cases should be at the semicolon.
Proposed resolution (January, 2011):
Change 6.4.2 [basic.scope.pdecl] paragraph 3 as follows:
...The point of declaration ofa templatean alias or alias template immediately followsthe identifier for the alias being declaredthe type-id to which the alias refers.