At this month's board meeting, a resolution was passed to move Apache C++
Standard Library to the Attic, due to inactivity.
The Attic home page  contains some details about its purpose - it is the
destination for Apache projects that can no longer provide oversight or muster
votes for a release. It isn't a reflection on the contributors or the codebase,
and is intended to be non-impacting to users.
Please let us know if you have any questions or comments, or if you are
available to work with the Attic to help with the transition of resources.
(on behalf of the ASF Board)