Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computer programming, specifically object-oriented programming, a class invariant is an invariant used to constrain objects of a class. Methods of the class should preserve the invariant. The class invariant constrains the state stored in the object. Class invariants are established during construction and constantly maintained between calls to public methods. Temporary breaking of class invariance between private method calls is possible, although not encouraged.

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