A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3728

Date: 2013-09-03

Packaging Parameter Packs (Rev. 2)

by Mike Spertus

Excerpt:

The purpose of this paper is to propose mechanisms and rationale for named parameter packs and literal parameter packs. The main idea is to allow parameter packs to be created and named in non-template contexts by allowing parameter pack literals, which are just a template parameter list enclosed in angle brackets. In particular, this proposal makes parameter packs suitable for use as typelists and allows them to be defined and referenced from outside of template classes. While this is not ready for standardization, I want to give and idea of the main ideas and a number of use cases to get feedback from the Reflection working group in Chicago, so a complete proposal can be provided in Seattle.