Chapter 6. Object Orientation (OBJ)
Rules
Risk Assessment Summary
OBJ00-J. Limit extensibility of classes and methods with invariants to trusted subclasses only
Many methods offer invariants, which can be any or all of the guarantees made about what the method can do, requirements about the required state of the object when the method is invoked, or guarantees about the state of the object when the method completes. For instance, the % operator, which computes the remainder of a number, provides the invariant that
0 < = abs(a % b) < abs(b), for ...
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