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setfields.m

## Copyright (C) 2000  Etienne Grossmann
##
## This program 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 2 of the License, or
## (at your option) any later version.
##
## This program 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 this program; If not, see <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn {Function File} {} @var{s} = setfields(@var{s},@var{key},@var{value},...)
## Sets @var{s}.@var{key1} = @var{value1},  @var{s}.@var{key2} = @var{value2}, etc, finally
## returning s.
## For some compatibility and flexibility.
## @seealso{cmpstruct, fields, rmfield, isstruct, getfields, isfield,struct}
## @end deftypefn

## Author:        Etienne Grossmann <etienne@cs.uky.edu>
## Last modified: January 2000
## November 2000: Paul Kienzle <pkienzle@kienzle.powernet.co.uk>
##     return error rather than trapping to keyboard

function s = setfields(s,varargin)
if nargin == 0
  s= struct; % doesn't work on older versions of octave
elseif rem(nargin,2) != 1,
  error('setfields: expected struct, key1, val1, key2, val2, ...\n') ; 
endif
      
for i=1:2:nargin-1
  if ! ischar(varargin{i}) ,
    error('setfields: called with non-string key') ; 
  else
    s.(varargin{i}) = varargin{i+1};
  end
end
%!
%!assert(setfields({},'key','value'),struct('key','value'))
%!

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