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Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Suppose that we have a function that registers a Cycle object. We also have a Scooter object that is a specialized Cycle (defined by inheritance). The substitution principle states The Scooter object can be used in the Cycle registration function because it is a kind of Cycle. The Scooter object can never be used in any function that is written to use a Cycle object. The Cycle object can always be used wherever a Scooter object is expected. A new registration function that is written to use a Scooter object can be used in place of the Cycle registration function.
Transcribed Image Text:Suppose that we have a function that registers a Cycle object. We also have a Scooter object that is a specialized Cycle (defined by inheritance). The substitution principle states The Scooter object can be used in the Cycle registration function because it is a kind of Cycle. The Scooter object can never be used in any function that is written to use a Cycle object. The Cycle object can always be used wherever a Scooter object is expected. A new registration function that is written to use a Scooter object can be used in place of the Cycle registration function.
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