[Octave-bug-tracker] [bug #62405] Out of Bound(OOB) on subsindex()

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URL:
  <https://savannah.gnu.org/bugs/?62405>

                 Summary: Out of Bound(OOB) on subsindex()
                 Project: GNU Octave
            Submitted by: linuxbckp
            Submitted on: Tue 03 May 2022 08:19:34 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 7.1.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

An object with overloaded subsindex() should get part of its field. Now Octave
can only get the whole field.
Here is my code:


Class InputContainer with overloaded subsindex():

#!/usr/bin/octave
# @InputContainer/InputContainer.m
function ret = InputContainer(mat)
    ret = class(struct("mat", mat), "InputContainer");
    fprintf('InputContainer class initialized.\n')
endfunction

#!/usr/bin/octave
# @InputContainer/subsindex.m
function ret = subsindex(this)
    ret = double(this.mat) - 1;
endfunction



Tnen I init InputContainer with [1 2 3 4]. 
The input range is [1 2 3 4]:

code line 1
>> input_container = InputContainer([1 2 3 4]);
InputContainer class initialized.



When I define a range that can contain input range, subindexing works fine:

>> b = 1:10;
>> b(input_container)
ans =

   1   2   3   4

>> b = 1:4;
>> b(input_container)
ans =

   1   2   3   4

But, when I define a range that can not contain input range, subindexing
throws error:

>> b = 1:2;
>> b(input_container)
error: b(4): out of bound 2 (dimensions are 1x2)






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