[Boost-users] [multi_index] A multi_index where one index is a subset of the whole collection

Hi, I've asked this question [1] two days ago on stackoverflow.com but haven't gotten any answer on it, yet. So I'll try it here. [1] http://stackoverflow.com/questions/10217601/a-multi-index-where-one-index-is... If this is not possible out of the box, can I write my own indices for multi_index that would allow such functionality? Cheers, Philipp Moeller GeometryFactory