Quote: modify the behavior of an object with traits, dynamic inheritance, or modes; e.g., distinguish open and iconified windows

Quotation Skeleton

The behavior of the operations of objects typically … a stack depends essentially on whether the stack … In conventional object-oriented systems, these kinds of logical … are hard to express. … Dynamic inheritance provides a solution to the problems … [p. 467] [An example using traits in Self.] Initially the parent slot of the … [window] … applicable to open windows are available. [Later, the parent slot may change to ClosedWindow or IconifiedWindow.]   Google-1   Google-2

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