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

1324. Value initialization and defaulted constructors

[Voted into the WP at the February, 2012 meeting; moved to DR at the October, 2012 meeting.]

One would expect that an example like

  struct B {
   B(const B&) = default;
  };

  B b{};

would invoke value-initialization, but (because it does not have a default constructor), the logic ladder of 9.4.5 [dcl.init.list] paragraph 3 makes it aggregate initialization instead:

• If the initializer list has no elements and T is a class type with a default constructor, the object is value-initialized.

• Otherwise, if T is an aggregate, aggregate initialization is performed (9.4.2 [dcl.init.aggr]).

Proposed resolution (August, 2011):

This issue is resolved by the resolution of issue 1301.