## Copyright (C) 2025
##
## This file is part of Octave.
##
## Octave is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, see
## <https://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn {} {@var{value} =} feature (@var{name})
## @deftypefnx {} {@var{value} =} feature (@var{name}, @var{value})
## Query or set internal Octave features (MATLAB compatibility).
##
## This function provides compatibility with MATLAB's @code{feature} function
## for querying and setting internal features.
##
## Supported features:
## @table @code
## @item getpid
## Returns the process ID of the current Octave process.
## @end table
##
## @example
## @group
## pid = feature ('getpid');
## @end group
## @end example
##
## @seealso{getpid}
## @end deftypefn

function value = feature (name, value)

  if (nargin < 1 || nargin > 2)
    print_usage ();
  endif

  if (! ischar (name) && ! isstring (name))
    error ("feature: NAME must be a string");
  endif

  name = char (name);

  switch (lower (name))
    case "getpid"
      if (nargin == 1)
        ## Query: return process ID
        value = getpid ();
      else
        ## Set: not supported for getpid
        error ("feature: cannot set 'getpid' feature");
      endif

    otherwise
      error ("feature: unknown feature '%s'", name);
  endswitch

endfunction

