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

    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