MATLAB Object-Oriented Programming

• It is a handle class (it derives from handle).


• All its superclasses are handle compatible (handle classes are handle compatible by
  definition).

classdef HPropertyDefaults < handle & Utility

properties

GraphPrim = line

Width = 1.5

Color = 'black'

end

end

The HPropertyDefaults class is handle compatible:

hpd = HPropertyDefaults;

mc = metaclass(hpd);

mc.HandleCompatible

ans =

1

Nonhandle Subclasses of a Handle-Compatible Class

If you subclass both a value class that is not handle compatible and a handle compatible

class, the subclass is a nonhandle compatible value class. The ValueSub class:

• Is a value class (it does not derive from handle.)


• One of its superclasses is handle compatible (the Utility class).

classdef ValueSub < MException & Utility

methods

function obj = ValueSub(str1,str2)

obj = obj@MException(str1,str2);

end

end

end

The ValueSub class is a nonhandle-compatible value class because the MException

class does not define the HandleCompatible attribute as true:

hv = ValueSub('MATLAB:narginchk:notEnoughInputs',...

'Not enough input arguments.');

mc = metaclass(hv);

mc.HandleCompatible

12 How to Build on Other Classes