This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 110d. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2023-02-24


432. Is injected class name visible in base class specifier list?

Section: 6.4.7  [basic.scope.class]     Status: CD1     Submitter: Daveed Vandevoorde     Date: 29 August 2003

[Voted into WP at March 2004 meeting.]

Consider the following example (inspired by a question from comp.lang.c++.moderated):

  template<typename> struct B {};
  template<typename T> struct D: B<D> {};

Most (all?) compilers reject this code because D is handled as a template name rather than as the injected class name.

Clause 11 [class]/2 says that the injected class name is "inserted into the scope of the class."

6.4.7 [basic.scope.class]/1 seems to be the text intended to describe what "scope of a class" means, but it assumes that every name in that scope was introduced using a "declarator". For an implicit declaration such as the injected-class name it is not clear what that means.

So my questions:

  1. Should the injected class name be available in the base class specifiers?
    John Spicer: I do not believe the injected class name should be available in the base specifier. I think the semantics of injected class names should be as if a magic declaration were inserted after the opening "{" of the class definition. The injected class name is a member of the class and members don't exist at the point where the base specifiers are scanned.
  2. Do you agree the wording should be clarified whatever the answer to the first question?
    John Spicer: I believe the 6.4.7 [basic.scope.class] wording should be updated to reflect the fact that not all names come from declarators.

Notes from October 2003 meeting:

We agree with John Spicer's suggested answers above.

Proposed Resolution (October 2003):

The answer to question 1 above is No and no change is required.

For question 1, change 6.4.7 [basic.scope.class] paragraph 1 rule 1 to:

1) The potential scope of a name declared in a class consists not only of the declarative region following the name's point of declaration declarator, but also of all function bodies, default arguments, and constructor ctor-initializers in that class (including such things in nested classes). The point of declaration of an injected-class-name (Clause 11 [class]) is immediately following the opening brace of the class definition.

(Note that this change overlaps a change in issue 417.)

Also change 6.4.2 [basic.scope.pdecl] by adding a new paragraph 8 for the injected-class-name case:

The point of declaration for an injected-class-name (Clause 11 [class]) is immediately following the opening brace of the class definition.

Alternatively this paragraph could be added after paragraph 5 and before the two note paragraphs (i.e. it would become paragraph 5a).