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: N3573

Date: 2013-03-10

Heterogenous extensions to unordered containers

by Mark Boyall

Excerpt:

[C]urrently, it is impossible to look up by a type other than the key type. This sounds reasonable but is actually fairly limiting. ... Secondly, it is impossible to override the hash or equivalence function for a given lookup. ...