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