Enumeration Class Restrictions - MATLAB & Simulink (original) (raw)
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Enumeration classes restrict certain aspects of their use and definition:
- Enumeration classes are implicitly
Sealed. You cannot define a subclass of an enumeration class because doing so would expand the set. - The properties of value-based enumeration classes are immutable. Only the constructor can assign property values. MATLAB® implicitly defines the
SetAccessattributes of all properties defined by value-based enumeration classes asimmutable. You cannot set theSetAccessattribute to any other value. - All properties inherited by a value-based enumeration class that are not defined as
Constantmust haveimmutableSetAccess. - The properties of handle-based enumeration classes are mutable. You can set property values on instances of the enumeration class. See Mutable Handle vs. Immutable Value Enumeration Members.
- An enumeration member cannot have the same name as a property, method, or event defined by the same class or inherited from a superclass. For example, an enumeration class that inherits from a built-in numeric superclass inherits the
fullmethod from the superclass, so "full" is not a valid member name. - Enumerations do not support colon (
a:b) operations. For example,FlowRate.Low:FlowRate.Highcauses an error even if theFlowRateclass derives from a numeric superclass. - Classes that define enumerations cannot restrict properties of the same class to an enumeration type. Create a separate enumeration class to restrict property values to an enumeration. For information on restricting property values, see Example of Restricted Property.
- If the primary enumeration member sets the
Hiddenattribute, then the secondary member (one with the same underlying value) must also set theHiddenattribute. For more information, see Hide Enumeration Members.