Hello, Some months ago I prompted for interest in a new type of indices for Boost.MultiIndex featuring random access facilities, and received a couple of expressions of itnerest. The preliminary specification was published at: http://195.235.93.150/rnd_indices_spec.html I've just uploaded a preview version of random access indices at FileVault -> Containers (http://tinyurl.com/9zlmj) This preview follows the previous specification save for one point: reserve/capacity is provided for control of an internal array of pointers to the nodes, as explained in http://195.235.93.150/rnd_indices_spec.html#interface. There's no docs yet on this type of indices, but the usage should be straightforward from the preliminay specification notes. Random access indices act as a functional drop-in replacement of sequenced indices, so you can start playing with them very easily. My requests: * Do you find these indices worth including in Boost.MultiIndex? * If so, do you have comments on the specification? Things you'd change/add? There's a list of concrete issues at the end of the specification page, * Do you envision any interesting use case for random access indices? Have you experimented with them? Thank you very much for your feddback, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo