Using Array of classes as a class member variable?

Howdy, First some basic questions: (1) Can you create an unitialised array ? (2) Can an unitinialised array be a class member variable ? My problem is this: I have a class called "user" - which represents one row in a mySQL table (also called user) I want to create a class called "userBag" - this class will contain an array of "user" classes - the constructor for "userBag" gets an SQL statement and uses this do decide which users to place in the userBag Maybe I'm going about this all worng, but is there some other way I can store a variable number of classes (Such as a CObject class in MFC for Visual C++) - i.e. is there soem other collection class/type I don't know of ? Thanks, Martin.