Liskov substitution principle

(programming, theory)(LSP) The principle thatobject-oriented functions that use pointers orreferences to a base class must be able to use objects ofa derived class without knowing it.

Barbara Liskov first wrote it as follows: If for each objecto1 of type S there is an object o2 of type T such that for allprograms P defined in terms of T, the behaviour of P isunchanged when o1 is substituted for o2 then S is a subtypeof T.

A function that violates the LSP uses a reference to a baseclass and must know about all the derivatives of that baseclass. Such a function violates the open/closed principlebecause it must be modified whenever a new derivative of thebase class is created.

[Liskov, B. Data Abstraction and Hierarchy, SIGPLANNotices. 23(5), May 1988].

单词	liskov substitution principle
释义	Liskov substitution principle Liskov substitution principle (programming, theory)(LSP) The principle thatobject-oriented functions that use pointers orreferences to a base class must be able to use objects ofa derived class without knowing it. Barbara Liskov first wrote it as follows: If for each objecto1 of type S there is an object o2 of type T such that for allprograms P defined in terms of T, the behaviour of P isunchanged when o1 is substituted for o2 then S is a subtypeof T. A function that violates the LSP uses a reference to a baseclass and must know about all the derivatives of that baseclass. Such a function violates the open/closed principlebecause it must be modified whenever a new derivative of thebase class is created. [Liskov, B. Data Abstraction and Hierarchy, SIGPLANNotices. 23(5), May 1988]. AcronymsSeelink state packet
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