This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
The current wording of the Standard does not make clear whether a special member function that is defaulted and implicitly deleted is trivial. Triviality is visible in various ways that don't involve invoking the function, such as determining whether a type is trivially copyable and determining the result of various type traits. It also factors into some ABI specifications.
(See also issue 1734.)
Notes from the June, 2014 meeting:
CWG felt that deleted functions should be trivial. See also issue 1590.
Additional note, November, 2014:
See paper N4148.
Additional note, October, 2015:
Moved from "extension" status to "open" to allow consideration by CWG. See the additional discussion in issue 1734 for further details. See also issue 1496.
Rationale (October, 2015):
CWG feels that the triviality of a deleted function should be irrelevant. Any cases in which the triviality of a deleted function is observable should be amended to remove that dependency.