[Boost-users] [multi_index] view with less items than in container possible?

The various indexes of the multi_index_container help to access items in a container differently. Is it also possible to create an index somehow with access to less items in the container? If there is for example a container with employees and I often need to iterate over female employees only is there a way to create an index for this (there could be a bool in the employee class to indicate who is female)? Boris