What is class invariant?

What is class invariant?
A class invariant is a
condition that defines all valid states for an object. It is a logical
condition to ensure the correct working of a class. Class invariants
must hold when an object is created, and they must be preserved under
all operations of the class. In particular all class invariants are
both preconditions and post-conditions for all operations or member
functions of the class.

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