Title
Static const data members and braced-init-lists
Status
cd2
Section
11.4.9.3 [class.static.data]
Submitter
Steve Adamczyk

Created on 2008-09-15.00:00:00 last changed 143 months ago

Messages

Date: 2009-07-15.00:00:00

[Voted into WP at July, 2009 meeting.]

Date: 2009-03-15.00:00:00

Proposed resolution (March, 2009):

  1. Change 7.7 [expr.const] paragraph 3 as follows:

  2. ...as enumerator initializers (9.7.1 [dcl.enum]), as static member initializers (11.4.9.3 [class.static.data]), and as integral or enumeration non-type template arguments (13.6 [temp.type]).
  3. Change 11.4.9.3 [class.static.data] paragraph 3 as follows:

  4. If a static data member is of const effective literal type, its declaration in the class definition can specify a brace-or-equal-initializer with an in which every initializer-clause that is an assignment-expression is a integral constant expression. A static data member of effective literal type can be declared in the class definition with the constexpr specifier; if so, its declaration shall specify a brace-or-equal-initializer with an in which every initializer-clause that is an assignment-expression is a integral constant expression. [Note: In both these cases, the member may appear in integral constant expressions. end note] The member shall still be defined in a namespace scope if it is used in the program and the namespace scope definition shall not contain an initializer.

[Drafting note: this change also corrects an editorial error resulting from overlapping changes that inadvertently retained the original restriction that only members of integral type could be initialized inside the class definition.]

Date: 2008-09-15.00:00:00

The recent changes in the handling of initialization have not touched the requirement that the in-class initializer for a const static data member must be of the form = assignment-expression and not a braced-init-list. It would be more consistent and general to allow the braced form as well.

History
Date User Action Args
2010-03-29 00:00:00adminsetstatus: wp -> cd2
2009-11-08 00:00:00adminsetstatus: dr -> wp
2009-08-03 00:00:00adminsetmessages: + msg2261
2009-08-03 00:00:00adminsetstatus: ready -> dr
2009-03-23 00:00:00adminsetmessages: + msg1891
2009-03-23 00:00:00adminsetstatus: open -> ready
2008-09-15 00:00:00admincreate