Pros and cons of using nested C++ classes and enumerations?

Question

What are the pros and cons of using nested public C++ classes and enumerations? For example, suppose you have a class called printer, and this class also store

Answer 1

Visual Studio 2008 does not seem to be able to provide intellisense for nested classes, so I have switched to the PIMPL idiom in most cases where I used to have a nested class. I always put enums either in the class if it is used only by that class, or outside the class in the same namespace as the class when more than one class uses the enum.