You can define a class within a class. If the nested class is declared as public, then you can create objects in the container class and return them to external code. Typically, however, you will want to declare a class that is used by the class and should be private. The following declares a public nested class:
class outer { public: class inner { public: void f(); }; inner g() { return inner(); } }; void outer::inner::f() { // do something }
Notice how the name of the nested class is prefixed with the name of the containing class.
