dictionary - How to share the key across the different map in c++? -

i'm working on map, stored data 2 different map(it nested map) having same key, way store data single ds rather 2 different nested maps. following 2 nested maps:

std::map<keystruct, std::map<classobjsharedptr, std::set<classobjsharedptr> > > map1;  std::map<keystruct, std::map<classobjsharedptr, std::set<classobjsharedptr> > > map2; 

here map1 , map2 have same key values.

i have maintained 2 different maps specific purpose. can store both maps in single ds? each key (i.e. each key have 2 internal map).

why not use single std::map required data?

example code

struct data {     std::map<classobjsharedptr, std::set<classobjsharedptr> > mdata1;     std::map<classobjsharedptr, std::set<classobjsharedptr> > mdata2; };  std::map<keystruct, data> mmapdata;