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Definition of "Default Initial Value" |
It is often important that we can rely upon an object having a value within its subtype even before it is assigned to and this especially applies in the face of type invariants and subtype predicates. Consider a type Location whose type invariant In_Place requires the point to be within some place.It is important to note that default initial values can only be given for types and not for subtypes. If a default initial value lies outside the range of a subtype then declaring an object of a subtype without its own specific initial value will raise Constraint_Error. |
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