Override how the value of a user defined class is displayed when it is a field of a structure

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Clark Williams
Clark Williams 2012-10-11
I have created my own class to act like an enumerated type. I haver overridden the method disp() so when a variable containing that type is displayed in the Command Window it shows something meaningful (specifically, the name of that enumerated value.)
classdef MyEnumeratedType
properties(Constant)
ENUMVAL1 = MyEnumeratedType(1, 'ENUMVAl1');
ENUMVAL2 = MyEnumeratedType(2, 'ENUMVAL2');
ENUMVAL3 = MyEnumeratedType(3, 'ENUMVAL3');
end
properties(Access=private)
ordinal
name
end
methods(Access=private)
function this = MyEnumeratedType(ord, name)
this.ordinal = ord;
this.name = name;
end
end
methods
function disp( this )
disp(this.name);
end
end
end
So when I assign it to a variable in the command window, I get the desired output:
>> x = MyEnumeratedType.ENUMVAL2
x =
ENUMVAL2
So far so good. BUT when I assign a value of type MyEnumeratedType to the field of a structure, the display of that structure doesn't display the value, but only tells me that I have a value of type MyEnumeratedType.
>> mystruct.field1 = 42
mystruct =
field1: 42
>> mystruct.field2 = MyEnumeratedType.ENUMVAL3
mystruct =
field1: 42
field2: [1x1 MyEnumeratedType]
How do I get the value of field2 to show up like it does for the double value in field1?
Question also posted at StackOverflow at http://stackoverflow.com/questions/12846290/override-how-the-value-of-a-user-defined-class-is-displayed-when-it-is-a-field-o

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回答（1 个）

Daniel Shub
Daniel Shub 2012-10-11
I think you would need to overload disp for the struct class.
  2 个评论
Matt J
Matt J 2012-10-11
You can create your own directory @struct and put a revised definition of the display() method in there. You can also call the builtin version of struct/display using the BUILTIN function to help you overload it. Seems like a lot of work to me, however.

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