Do PostgreSQL have map and set structure(like STL in C++)?

Dear PostgreSQL Community: I want to add a feature in PostgreSQL, and I need use map structure and set structure(like STL in C++). Do PostgreSQL have realized these structures? Where can I find the functions?
What I need in the code is just like this:
map<char*, set<char*> >
set<char*>
Thank you,
Liu Baozhu