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Delphi

published
  property Constraints: TValueConstraints read FConstraints write SetConstraints;
 

Defined types allow you to define four types of Constraints, or enumerations: atom, string, integer, and float. Constraints limit the allowable values for each of the BaseTypes. If a value is assigned to a variable which is of the defined type, it is type-checked. First, the value must be of one of the allowed BaseTypes. Next, if the value is a integer or float and the defined type is RangeLimited, the value must fall within the allowed range. Finally, if the value has a constraint, it must be contained within its respective constraint list (ConstraintAtom, ConstraintFloat, ConstraintInteger, or ConstraintString).

Note that values of a different type are not constrained, e.g., a string value ignores atom constraints.

Note that if Constraints defines a constraint and the equivalent constraint list is empty, it is the same as not allowing that type of value

Reference

•TIEDefinedType

•IEDefinedType