This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 110b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2023-01-15


1492. Exception specifications on template destructors

Section: 11.4.7  [class.dtor]     Status: CD4     Submitter: Jason Merrill     Date: 2012-04-01

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

According to 11.4.7 [class.dtor] paragraph 3,

A declaration of a destructor that does not have an exception-specification is implicitly considered to have the same exception-specification as an implicit declaration (14.5 [except.spec]).

The implications of this are not clear for the destructor of a class template. For example,

  template <class T> struct B: T {
    ~B();
  };
  template <class T> B<T>::~B() noexcept {}

The implicit exception-specification of the in-class declaration of the destructor depends on the characteristics of the template argument. Does this mean that the out-of-class definition of the destructor is ill-formed, or will it be ill-formed only in specializations where the template argument causes the implicit exception-specification to be other than noexcept?

Proposed resolution (February, 2014):

This issue is resolved by the resolution of issue 1552.

Notes from the April, 2013 meeting:

This issue was approved as a DR at the April, 2013 (Bristol) meeting, but it was not noticed that issue 1552 was not being moved at that time. It is being returned to "drafting" status pending the resolution of that issue.