[Octave-bug-tracker] [bug #58572] cellfun calls overloaded functions for class method isnumeric called instead of built-in isnumeric

[Markus Mützel]

Follow-up Comment #5, bug #58572 (project octave):

@jwe: That seems to be the case.
I modified "use_num" like this:

    function rslt = use_num(obj)
      fh = @isnumeric;
      functions (fh)
      fh(obj)
      rslt = cellfun(fh, {'a_name'});
    end


The result is:

>> ci = c_tst;
use_num_result = ci.use_num

ans = 

  struct with fields:

    function: 'isnumeric'
        type: 'classsimple'
        file: 'MATLAB built-in function'
       class: 'c_tst'

c_tst.isnumeric called

ans =

  logical

   1


use_num_result =

  logical

   0


And similarly for a function that isn't built-in:

classdef c2_tst
  methods
    function rslt = use_ff(obj)
      fh = @fullfile;
      functions (fh)
      fh(obj)
      rslt = cellfun(fh, {'a_name'});
    end
    function rslt = fullfile(obj)
      disp('c2_tst.fullfile called');
      rslt = true;
    end
  end
end


Results with Matlab R2020a:

>> res = c2.use_ff

ans = 

  struct with fields:

    function: 'fullfile'
        type: 'classsimple'
        file: 'C:\Program
Files\MATLAB\R2020a\toolbox\matlab\iofun\fullfile.m'
       class: 'c2_tst'

c2_tst.fullfile called

ans =

  logical

   1

Error using cellfun
Non-scalar in Uniform output, at index 1, output 1.
Set 'UniformOutput' to false.

Error in c2_tst/use_ff (line 7)
      rslt = cellfun(fh, {'a_name'});



"file" seems to be where the function handle dispatches to if the input is
*not* the "class".

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