[Octave-bug-tracker] [bug #56856] Matlab calls class subsasgn method with array of double instead of class type

[Nicholas Jankowski]

Follow-up Comment #12, bug #56856 (project octave):

using the class from the attached @test2.zip:

Matlab 2023b:

>> y = subsasgn (zeros(1, 10), substruct('()', {10}), inputParser())
Unable to perform assignment because value of type 'inputParser' is not
convertible to 'double'.

Caused by:
    Error using double
    Conversion to double from inputParser is not possible.

>> a = test
calling the test constructor

a = 

Calling test.size.
  test with no properties

x

>> x(10)=a
Calling test.subsasgn(val, idx, rhs).
val is of type 'double':

val =

     []

idx is of type 'struct':

idx = 

  struct with fields:

    type: '()'
    subs: {[10]}

rhs is of type 'test':

rhs = 

Calling test.size.
  test with no properties.

Output argument "result" (and possibly others) not assigned a value in the
execution with "test/subsasgn" function.


Octave 8.3.0, no VM:

>> y = subsasgn (zeros(1, 10), substruct('()', {10}), inputParser())
error: operator =: no conversion for assignment of 'object' to indexed
'matrix'

>> a = test
calling the test constructor
a =

  test object with properties:


>> Calling test.size.
error: 'result1' undefined near line 2, column 11
error: called from
    size at line 4 column 1
>> Calling test.size.
error: 'result1' undefined near line 2, column 11
error: called from
    size at line 4 column 1
>> Calling test.size.
error: 'result1' undefined near line 2, column 11
error: called from
    size at line 4 column 1
>> Calling test.size.
error: 'result1' undefined near line 2, column 11
error: called from
    size at line 4 column 1
>> Calling test.size.
error: 'result1' undefined near line 2, column 11
error: called from
    size at line 4 column 1
Calling test.size.
>> error: 'result1' undefined near line 2, column 11
error: called from
    size at line 4 column 1
>> Calling test.size.
<snip>

(stuck in infinite loop, had to kill octave)

>> x(10)=test
calling the test constructor
Calling test.subsasgn(val, idx, rhs).
val is of type 'test':
val =

  test object array with properties:


idx is of type 'struct':
idx =

  scalar structure containing the fields:

    type = ()
    subs =
    {
      [1,1] = 10
    }


rhs is of type 'test':
rhs =

  test object with properties:


Calling test.size.
error: 'result' undefined near line 2, column 10
error: called from
    subsasgn at line 11 column 1


rebuilding v9 now to test that w and w/o VM


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