[Boost-users] Sort boost composite container

I am having below composite container. I am looking to sort the container by member<CA,std::string,&CA::card> at the end. Can some one help me to achieve this? typedef multi_index_container< CA, indexed_by< ordered_unique< composite_key< CA, member<CA,std::string,&CA::name>, member<CA,std::string,&CA::displayName>, member<CA,std::string,&CA::card> > >

duplicateBook;

Regards, UJ