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


830. Deprecating exception specifications

Section: 14.5  [except.spec]     Status: CD2     Submitter: UK     Date: 3 March, 2009

N2800 comment UK 136

[Voted into WP at March, 2010 meeting as paper N3051.]

Exception specifications have proven close to worthless in practice, while adding a measurable overhead to programs. The feature should be deprecated. The one exception to the rule is the empty throw specification which could serve a legitimate optimizing role if the requirement to call std::unexpected were relaxed in this case.

Notes from the July, 2009 meeting:

The consensus of the CWG was in favor of deprecating exception specifications. Further discussion, and with a wider constituency, is needed to determine a position on the status of throw().

(See also issue 814.)