matlab.lang.invalidHandle

Create a 2-by-3 array of invalid handles to TrialData objects. (See the end of the example for the TrialData class code.)

h = matlab.lang.invalidHandle("TrialData",2,3)

h = 

  2×3 TrialData array with properties:

    trialNumber
    trialResults

Access one of the array elements to verify that it holds a handle to a deleted TrialData object.

h(1,1)

ans = 

  handle to deleted TrialData

Code for TrialData Class

classdef TrialData < handle
    properties
        trialNumber string = "A001"
        trialResults double = 0
    end
end

Properties defined using the WeakHandle attribute must use class validation. When WeakHandle properties define a default value, that default must be an empty array or an invalid handle array that satisfies the class validation.

Create a class that defines a WeakHandle property of class TrialData with size (1,3). (See the end of Create Array of Invalid Handles for the TrialData class code.) Use matlab.lang.invalidHandle to create a default value for the property.

classdef WeakDefault
   properties (WeakHandle)
      Prop1 (1,3) TrialData = matlab.lang.invalidHandle("TrialData",1,3)
   end
end

Construct an instance of the class.

wd = WeakDefault

wd = 

  WeakDefault with properties:

    Prop1: [1×3 TrialData]

Access one of the elements of wd.Prop1 to verify that it holds a handle to a deleted instance of TrialData.

wd.Prop1(1,1)

ans = 

  handle to deleted TrialData