Handling Collections/Objects in C++

 I have some user defined types that are collections containing nested tables.  For example:

CREATE OR REPLACE TYPE a_list_type AS OBJECT (

  a_id INTEGER,

  start_date DATE,

  stop_date DATE,

  desc VARCHAR2(64)

);

CREATE OR REPLACE TYPE a_collection AS TABLE of a_list_type;

CREATE OR REPLACE TYPE main_type AS OBJECT (

   main_id INTEGER,

   main_type VARCHAR2(10),

   a_list_collection a_collection

);

CREATE OR REPLACE TYPE main_collection AS TABLE OF main_type;

Assuming I have a store function that populates and returns an object of "main_collection" type.  How would I reference the returned object from inside a C++ program?  What sort of C++ object would an Oracle object be returned into?