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Class Attributes

Specifying Class Attributes

All classes support the attributes listed in the following table. Attributes enable you to modify the behavior of class. Attribute values apply to the class defined within the classdef block.

classdef (Attribute1 = value1, Attribute2 = value2,...) ClassName
   ...
end
For more information on attribute syntax, see Attribute Specification.

Class Attributes

Attribute Name

Class

Description

Abstract

logical

(default = false)

If specified as true, this class is an abstract class (cannot be instantiated).

See Abstract Classes for more information.

AllowedSubclasses

meta.class object or cell array of meta.class objects

List classes that can subclass this class. Specify subclasses as meta.class objects in the form:

  • A single meta.class object

  • A cell array of meta.class objects. An empty cell array, {}, is the same as a Sealed class (no subclasses).

Specify meta.class objects using the ?ClassName syntax only.

See Specify Allowed Subclasses for more information.

ConstructOnLoad

logical

(default = false)

If true, MATLAB® calls the class constructor when loading an object from a MAT-file. Therefore, implement the constructor so it can be called with no arguments without producing an error.

See Initialize Objects When Loading for more information.

HandleCompatible

logical

(default = false) for value classes

If specified as true, this class can be used as a superclass for handle classes. All handle classes are HandleCompatible by definition. See Support Both Handle and Value Subclasses for more information.

Hidden

logical

(default = false)

If true, this class does not appear in the output of the superclasses or help functions.

InferiorClasses

meta.class object or cell array of meta.class objects

Use this attribute to establish a precedence relationship among classes. Specify a cell array of meta.class objects using the ? operator.

The fundamental classes are always inferior to user-defined classes and do not show up in this list.

See Class Precedence and Dominant Argument in Overloaded Graphics Functions.

Sealed

logical

(default = false)

If true, this class cannot be subclassed.

Specifying Attributes

Attributes are specified for class members in the classdef, properties, methods, and events definition blocks. The particular attribute setting applies to all members defined within that particular block. You can use multiple properties definition blocks to apply different attribute setting to different properties.

Superclass Attributes Are Not Inherited

Class attributes are not inherited, so superclass attributes do not affect subclasses.

Attribute Syntax

Specify class attribute values in parentheses, separating each attribute name/attribute value pair with a comma. The attribute list always follows the classdef or class member keyword, as shown:

classdef (attribute-name = expression, ...) ClassName

   properties (attribute-name = expression, ...)
      ...
   end
   methods (attribute-name = expression, ...)
      ...
   end
   events (attribute-name = expression, ...)
      ...
   end
end

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