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Section 8.12.1.19:
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Inheritance Diagram
This abstract class defines a state component which is a set of all instantiations of objects of any class sub-typing from this class in addition to the vdm model types used wherever this class name is used. Note that SAME has to be an instantiated class, not an abstract one.
types SAME = object_type ; $RATIONAL = set of object_type state references : $RATIONAL inv ref_types == forall obj | obj in set ref_types & sub_type($RATIONAL,obj)
NOTE | See the important note about vdm state in the notes on vdm-sl usage in this specification. |
This abstraction models the domain of rational numbers.
This abstraction defines no features of its own.
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or enquiries should be made to Keith Hopper. Page last modified:Sunday, 3 June 2001. |
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