This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
[Voted into the WP at the February, 2012 meeting; moved to DR at the October, 2012 meeting.]
The grammar allows a brace-or-equal-initializer for any class member with a member-declarator, including typedef members and member function declarations, and there is no semantic restriction forbidding those forms, either.
Proposed resolution (August, 2011):
In 11.4 [class.mem], delete paragraph 4 and change paragraph 5 as follows:
A member can be initialized using a constructor; see 11.4.5 [class.ctor]. [Note: See 11.4.4 [special] for a description of constructors and other special member functions. —end note]
member can be initialized using abrace-or-equal-initializer . (For static data members, see 18.104.22.168 [class.static.data]; for non-static data members, see 11.9.3 [class.base.init]).