[boost] [repost][multi_index][rfc] random access indices

Hello all, I'm considering whether to add to Boost.MultiIndex a new type of indices with random access semantics, somewhat similar to std::vectors. As I wouldn't like to keep adding things to the library without some actual feedback as of its suitability, I've written some preliminary notes about how these indices could look like, located at: http://195.235.93.150/rnd_indices_spec.html I'm very interested in knowing your opinion about this stuff, ways of improving the spec, and most of all whether it is really an interesting thing to have in Boost.MultiIndex 1.34. Please go ahead and comment on this. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo