This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 115d. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2024-10-26

1834. Constant initialization binding a reference to an xvalue

[Moved to DR at the November, 2014 meeting.]

According to 6.9.3.2 [basic.start.static] paragraph 2,

Constant initialization is performed:

• if each full-expression (including implicit conversions) that appears in the initializer of a reference with static or thread storage duration is a constant expression (7.7 [expr.const]) and the reference is bound to an lvalue designating an object with static storage duration or to a temporary (see 6.7.7 [class.temporary]);

• ...

This wording should also permit the reference to be bound to an xvalue, e.g., a subobject of a temporary, and not just to a complete temporary.

Proposed resolution (February, 2014):

Change 6.9.3.2 [basic.start.static] paragraph 2 as follows (note that this resolution incorporates the overlapping change from the resolution of issue 1299)::

...Constant initialization is performed:

• if each full-expression (including implicit conversions) that appears in the initializer of a reference with static or thread storage duration is a constant expression (7.7 [expr.const]) and the reference is bound to an lvalue a glvalue designating an object with static storage duration, to a temporary object (see 6.7.7 [class.temporary]) or subobject thereof, or to a function;

• ...