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That's right; that's in the private part of the package.
This is important to note - even when something is implemented using
access types, that doesn't mean that everyone needs to see how stacks
are implemented.
In this example, customers can push and pop values on a stack without
knowing how access values work.
Note that this version of Generic_Stack is composable. Since this version supports assignment (:=) and equality (=), we can create stacks of stacks. Even if you never create a stack of stacks, checking to see if a reusable component is composable is a good way to check on the generality of a resuable component [Wheeler 1992].
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David A. Wheeler (dwheeler@ida.org)