MATLAB Object-Oriented Programming

Initialize Objects When Loading

In this section...

“Calling Constructor When Loading Objects” on page 13-30

“Initializing Objects in the loadobj Method” on page 13-30

Calling Constructor When Loading Objects

MATLAB does not call the class constructor when loading an object from a MAT-file.

However, if you set the ConstructOnLoad class attribute to true, load does call the

constructor with no arguments.

Enable ConstructOnLoad when you do not want to implement a loadobj method, but

must perform some actions at construction time. For example, enable ConstructOnLoad

when you are registering listeners for another object. Ensure that MATLAB can call the

class constructor with no arguments without generating an error.

Attributes set on superclasses are not inherited by subclasses. Therefore, MATLAB does

use the value of the superclass ConstructOnLoad attribute when loading objects. If you

want MATLAB to call the class constructor, set the ConstructOnLoad attribute in your

specific subclass.

If the constructor requires input arguments, use a loadobj method.

Initializing Objects in the loadobj Method

Use a loadobj method when the class constructor requires input arguments to perform

object initialization.

The LabResults class shares the constructor object initialization steps with the

loadobj method by performing these steps in the assignStatus method.

Objects of the LabResults class:

• Hold values for the results of tests.


• Assign a status for each value based on a set of criteria.

classdef LabResult

properties

13 Saving and Loading Objects