Enumeration Class Restrictions
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 SetAccess
attributes of all properties defined by value-based enumeration classes as immutable.
You cannot set the SetAccess attribute to any other value. - All properties inherited by a value-based enumeration class that are not defined as
Constant must have immutable SetAccess. - 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” on page 14-34. - An enumeration member cannot have the same name as a property, method, or event
defined by the same class. - Enumerations do not support colon (a:b) operations. For example,
FlowRate.Low:FlowRate.High causes an error even if the FlowRate class derives
from a numeric superclass. - Classes that define enumerations cannot restrict properties of the same class to an
enumeration type. You must create a separate enumeration class to restrict property
values to an enumeration. For information on restricting property values, see
“Example of Restricted Property” on page 14-17.
See Also
Related Examples
- “Enumerations Derived from Built-In Types” on page 14-28
Enumeration Class Restrictions