Hi, There are several Boost-related projects underway around the theme of unordered containers (in my case, I'm pretty much on the verge of releasing a preview of hashed indices for Boost.MultiIndex.) All these projects have the common need of a hash<> implementation being available, preferrably promoted to a public namespace rather than as an implementation detail. Although Boost.TR1's purpose is not to implement new features but rather wrap them to achieve std::tr1-compliance, I think it'd be very useful if some tr1-hash implementation could be added to Boost. For the record, I'm currently using Jeremy Maitin-Shepard and Daniel James' implementation in Sanbox files/unordered.tar.gz. I think it is a rather solid implementation, taking care of compilers witohut PTS such as MSVC++ 6.0/7.0. As for the location, my pereference would be boost/functional/hash.hpp. Boost.TR1 could embrace this later in boost/tr1/functional.hpp. Could this be done? Maybe as a separate activity from Boost.TR1? Am I entitled to do it myself as part of the upgrade of my library, even though this would be adding a new library in disguise? As it happens, I think I'll be able to release hashed indices in time for Boost 1.33, but this detail can be a showstopper :( Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo