Quote: abstract data as matrix of constructors and observations of abstract state; e.g. cons and head

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A general view of abstract data is based … while the observations retrieve information about abstract data. … to each constructor. This information is naturally organized … Each cell in the matrix defines the behavior … integer lists. The constructors are nil, which constructs … list … . The observers are null?, head, and tail. … [p. 156] Using this framework, a mutable data abstraction … just the value of the observations, but their …   Google-1   Google-2

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