(LSP) The principle that object-oriented functions that use pointers or references to a base class must be able to use objects of a derived class without knowing it.
Barbara Liskov first wrote it as follows: If for each object o1 of type S there is an object o2 of type T such that for all programs P defined in terms of T, the behaviour of P is unchanged when o1 is substituted for o2 then S is a subtype of T.
A function that violates the LSP uses a reference to a base class and must know about all the derivatives of that base class. Such a function violates the open/closed principle because it must be modified whenever a new derivative of the base class is created.
[Liskov, B. Data Abstraction and Hierarchy, SIGPLAN Notices. 23(5), May 1988].
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noun 1. a fine, high-twisted and hard-twisted cotton thread, at least two-ply, used for hosiery, gloves, etc.
[lisp] /lɪsp/ noun 1. a speech defect consisting in pronouncing s and z like or nearly like the th- sounds of thin and this, respectively. 2. Phonetics. any unconventional articulation of the sibilants, as the pronunciation of s and z with the tongue between the teeth (lingual protrusion lisp) close to or touching the upper […]
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The original Lisp. Invented by John McCarthy et al at MIT in the late 50’s. Followed by LISP 1.5.